Pub Date : 2025-12-31DOI: 10.1016/j.surfin.2025.108402
Paola Arjona-Jaime, Luis F. Chazaro-Ruiz, Rene Rangel-Mendez
The development of efficient and cost-effective CO2 adsorbents for low-to-moderate temperatures is essential for advancing post-combustion carbon capture. This study investigates the structure-performance relationships of calcium (Ca)-modified macroporous biochar synthesized by microwave-assisted methods for CO2 capture at 25−150°C. Key synthesis parameters, including initial Ca content, pH, temperature, and irradiation time, were systematically evaluated. Alkaline conditions (pH > 11.8), saturated Ca concentrations (0.25−0.50 M), and moderate synthesis temperatures (130−170°C) promoted nucleation and particle growth, significantly reducing crystallite size compared to conventional methods and enhancing surface coverage and reactivity. The incorporation of 1.0−2.3 wt.% Ca, mainly as CaO/Ca(OH)2 (average ratios of 52−58 % and 42−48 %, respectively), increased the biochar surface area by 44−54 % and enhanced microporosity, resulting in superior CO2 capture, particularly at higher temperatures (80−150°C). BC(Ca)-0.50 achieved a CO2 uptake of 1.58 mmol/g at 25°C and 1 bar, and 0.27 mmol/g at 150°C, corresponding to physisorption at low temperatures and chemisorption through surface carbonation of reactive Ca species at higher temperatures. Ca modification not only introduces basic Ca species onto biochar but also alters the carbon surface chemistry, both of which are important for CO2 capture performance. Especially, Ca-modified biochars maintained their structural integrity and 99 % of their CO2 capacity over multiple adsorption-desorption cycles, demonstrating excellent regeneration potential. These findings highlight the importance of systematically understanding low-to-moderate temperature CO2 capture, particularly the role of synthesis conditions in preventing Ca-based particle agglomeration and ensuring controlled dispersion within porous adsorbents.
{"title":"Regenerable Ca-modified biochars for CO2 capture at industrial flue gas temperatures: Unveiling the role of microwave synthesis parameters","authors":"Paola Arjona-Jaime, Luis F. Chazaro-Ruiz, Rene Rangel-Mendez","doi":"10.1016/j.surfin.2025.108402","DOIUrl":"10.1016/j.surfin.2025.108402","url":null,"abstract":"<div><div>The development of efficient and cost-effective CO<sub>2</sub> adsorbents for low-to-moderate temperatures is essential for advancing post-combustion carbon capture. This study investigates the structure-performance relationships of calcium (Ca)-modified macroporous biochar synthesized by microwave-assisted methods for CO<sub>2</sub> capture at 25−150°C. Key synthesis parameters, including initial Ca content, pH, temperature, and irradiation time, were systematically evaluated. Alkaline conditions (pH > 11.8), saturated Ca concentrations (0.25−0.50 M), and moderate synthesis temperatures (130−170°C) promoted nucleation and particle growth, significantly reducing crystallite size compared to conventional methods and enhancing surface coverage and reactivity. The incorporation of 1.0−2.3 wt.% Ca, mainly as CaO/Ca(OH)<sub>2</sub> (average ratios of 52−58 % and 42−48 %, respectively), increased the biochar surface area by 44−54 % and enhanced microporosity, resulting in superior CO<sub>2</sub> capture, particularly at higher temperatures (80−150°C). BC(Ca)-0.50 achieved a CO<sub>2</sub> uptake of 1.58 mmol/g at 25°C and 1 bar, and 0.27 mmol/g at 150°C, corresponding to physisorption at low temperatures and chemisorption through surface carbonation of reactive Ca species at higher temperatures. Ca modification not only introduces basic Ca species onto biochar but also alters the carbon surface chemistry, both of which are important for CO<sub>2</sub> capture performance. Especially, Ca-modified biochars maintained their structural integrity and 99 % of their CO<sub>2</sub> capacity over multiple adsorption-desorption cycles, demonstrating excellent regeneration potential. These findings highlight the importance of systematically understanding low-to-moderate temperature CO<sub>2</sub> capture, particularly the role of synthesis conditions in preventing Ca-based particle agglomeration and ensuring controlled dispersion within porous adsorbents.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108402"},"PeriodicalIF":6.3,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-31DOI: 10.1016/j.surfin.2025.108410
R.M. Kershi , Alfred Addo-Mensah , Bassam Saif
Optical filters are increasingly used in a wide range of devices. However, it remains a great challenge to fabricate optical filter platforms with high stability and large-scale production. Herein, for the first time, we describe a facile and rotary thermal spray large-scale approach, to produce a new class of optical filter platform by the integration of plasmonic Au NPs and biocompatible phytic acid platforms (Au@Ph film), which act as nanostructured photonic materials. Importantly, it is found that the Au@Ph film possesses unique optical properties, easy large-scale production, and high stability, and without the need for post-modifications or complex reaction conditions. The present facile, large-scale, and general strategy could open up numerous opportunities for a range of applications in optoelectronic devices and their promising uses in different photonic circuit device areas.
{"title":"The synthesis of porous semiconductor gold phytate film for optical filter applications","authors":"R.M. Kershi , Alfred Addo-Mensah , Bassam Saif","doi":"10.1016/j.surfin.2025.108410","DOIUrl":"10.1016/j.surfin.2025.108410","url":null,"abstract":"<div><div>Optical filters are increasingly used in a wide range of devices. However, it remains a great challenge to fabricate optical filter platforms with high stability and large-scale production. Herein, for the first time, we describe a facile and rotary thermal spray large-scale approach, to produce a new class of optical filter platform by the integration of plasmonic Au NPs and biocompatible phytic acid platforms (Au@Ph film), which act as nanostructured photonic materials. Importantly, it is found that the Au@Ph film possesses unique optical properties, easy large-scale production, and high stability, and without the need for post-modifications or complex reaction conditions. The present facile, large-scale, and general strategy could open up numerous opportunities for a range of applications in optoelectronic devices and their promising uses in different photonic circuit device areas.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108410"},"PeriodicalIF":6.3,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The metal oxide-MWCNT composite sensors generally exhibit poor CO2 sensing performance even at elevated temperatures. The present study deals with this very challenge of metal oxide-MWCNT composite in sensing CO2 gas at room-temperature, by developing a room temperature CO2 sensor based on MWCNTs-β-MnO2 nanocomposite films. β-MnO2 was hydrothermally synthesized and MWCNTs were incorporated at 0 – 6 weight% via solid state method. XRD confirmed the tetragonal β-MnO2 phase and revealed a drop in crystallite size from 44.67 nm in β-MnO2 to 26.98 nm in 6% MWCNTs-β-MnO2 composite, along with an increase in crystallinity from 80.89% to 89.18%. FE-SEM showed hexagonal layered structure of β-MnO2 and their enhanced intermixing with MWCNTs as its concentration progressed. The UV-Visible spectroscopy indicated band gap narrowing from 2.87 eV for β-MnO2 to 2.31 eV for 6% MWCNTs-β-MnO2, highlighting the surface modification. EDAX and FT-IR confirmed the elements and the functional groups. The test for CO2 detection on all the samples, in the range of 250 ppm to 1000 ppm, showed that the 6% MWCNTs-β-MnO2 composite film achieved the highest performance. It exhibited the sensing response of 3.44 at 1000 ppm, twice the response of β-MnO2. Its response and recovery time were 7.24 s and 4.09 s. The limit of detection of the sensor was 73 ppm. This sensor demonstrated strong CO2 selectivity, stability and repeatability. These outcomes confirmed that MWCNTs incorporation effectively tunes the properties of β-MnO2 for practical room-temperature CO2 sensing.
{"title":"β-MnO2-MWCNTs composite nano-sensor for efficient detection of CO2 at room temperature","authors":"Shriya Tripathi , Narendra Kumar Pandey , Monu Gupta , Vernica Verma , Bal Chandra Yadav","doi":"10.1016/j.surfin.2025.108403","DOIUrl":"10.1016/j.surfin.2025.108403","url":null,"abstract":"<div><div>The metal oxide-MWCNT composite sensors generally exhibit poor CO<sub>2</sub> sensing performance even at elevated temperatures. The present study deals with this very challenge of metal oxide-MWCNT composite in sensing CO<sub>2</sub> gas at room-temperature, by developing a room temperature CO<sub>2</sub> sensor based on MWCNTs-β-MnO<sub>2</sub> nanocomposite films. β-MnO<sub>2</sub> was hydrothermally synthesized and MWCNTs were incorporated at 0 – 6 weight% via solid state method. XRD confirmed the tetragonal β-MnO<sub>2</sub> phase and revealed a drop in crystallite size from 44.67 nm in β-MnO<sub>2</sub> to 26.98 nm in 6% MWCNTs-β-MnO<sub>2</sub> composite, along with an increase in crystallinity from 80.89% to 89.18%. FE-SEM showed hexagonal layered structure of β-MnO<sub>2</sub> and their enhanced intermixing with MWCNTs as its concentration progressed. The UV-Visible spectroscopy indicated band gap narrowing from 2.87 eV for β-MnO<sub>2</sub> to 2.31 eV for 6% MWCNTs-β-MnO<sub>2</sub>, highlighting the surface modification. EDAX and FT-IR confirmed the elements and the functional groups. The test for CO<sub>2</sub> detection on all the samples, in the range of 250 ppm to 1000 ppm, showed that the 6% MWCNTs-β-MnO<sub>2</sub> composite film achieved the highest performance. It exhibited the sensing response of 3.44 at 1000 ppm, twice the response of β-MnO<sub>2</sub>. Its response and recovery time were 7.24 s and 4.09 s. The limit of detection of the sensor was 73 ppm. This sensor demonstrated strong CO<sub>2</sub> selectivity, stability and repeatability. These outcomes confirmed that MWCNTs incorporation effectively tunes the properties of β-MnO<sub>2</sub> for practical room-temperature CO<sub>2</sub> sensing.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108403"},"PeriodicalIF":6.3,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We employed a cost-effective solution dispersion method to fabricate NiFe2O4/Ti3C2 (MXene) composites in the form of rectangular strips on ultra-high molecular weight polyethylene (UHMWPE) substrates. We conducted comprehensive characterization using X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), UV-vis diffuse reflectance spectra (UV–DRS), Photoluminescence (PL), and Raman spectroscopy to elucidate the composites’ structural, morphological, vibrational, and optical properties. XRD confirmed the successful incorporation of Ti3C2 into the highly crystalline NiFe2O4, and FESEM images revealed homogeneous dispersion within the composite matrix. FTIR analysis showed the formation of strong metal–oxygen bonds, and UV–DRS revealed enhanced optical absorption and a reduced band gap from 1.76 to 1.55 eV due to the incorporation of Ti3C2, suggesting potential applications in photocatalytic and optoelectronics. PL studies revealed emission in the visible region spectrum (400–550 nm), with Ti3C2 contributing to intensified and sharper emission peaks via improved charge transfer and defect-state modulation. The composite exhibited superior luminescence efficiency and emitted blue-violet light, making it ideal for white light-emitting diode (WLED) applications. Enhanced color rendering (R9 = 79–81) and optimized Duv values underscore Ti3C2 role in improving optical performance by modulating oxygen vacancies and tuning band structures. This work highlights the potential of NiFe2O4/Ti3C2 composites as tunable, multifunctional materials for next-generation optoelectronic and photocatalytic devices.
{"title":"MXene-modified NiFe2O4 composites on UHMWPE: Structural, optical, and photoluminescent properties","authors":"Jayashree Patra , Pujarani Parida , Vijay Raj Singh , Siva Kumar Reddy , Parth Patel , Santosh Kumar Sahoo , Somnath Mahapatra , Virendra Kumar Verma","doi":"10.1016/j.surfin.2025.108406","DOIUrl":"10.1016/j.surfin.2025.108406","url":null,"abstract":"<div><div>We employed a cost-effective solution dispersion method to fabricate NiFe<sub>2</sub>O<sub>4</sub>/Ti<sub>3</sub>C<sub>2</sub> (MXene) composites in the form of rectangular strips on ultra-high molecular weight polyethylene (UHMWPE) substrates. We conducted comprehensive characterization using X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), UV-vis diffuse reflectance spectra (UV–DRS), Photoluminescence (PL), and Raman spectroscopy to elucidate the composites’ structural, morphological, vibrational, and optical properties. XRD confirmed the successful incorporation of Ti<sub>3</sub>C<sub>2</sub> into the highly crystalline NiFe<sub>2</sub>O<sub>4</sub>, and FESEM images revealed homogeneous dispersion within the composite matrix. FTIR analysis showed the formation of strong metal–oxygen bonds, and UV–DRS revealed enhanced optical absorption and a reduced band gap from 1.76 to 1.55 eV due to the incorporation of Ti<sub>3</sub>C<sub>2</sub>, suggesting potential applications in photocatalytic and optoelectronics. PL studies revealed emission in the visible region spectrum (400–550 nm), with Ti<sub>3</sub>C<sub>2</sub> contributing to intensified and sharper emission peaks via improved charge transfer and defect-state modulation. The composite exhibited superior luminescence efficiency and emitted blue-violet light, making it ideal for white light-emitting diode (WLED) applications. Enhanced color rendering (R9 = 79–81) and optimized Duv values underscore Ti<sub>3</sub>C<sub>2</sub> role in improving optical performance by modulating oxygen vacancies and tuning band structures. This work highlights the potential of NiFe<sub>2</sub>O<sub>4</sub>/Ti<sub>3</sub>C<sub>2</sub> composites as tunable, multifunctional materials for next-generation optoelectronic and photocatalytic devices.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108406"},"PeriodicalIF":6.3,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-30DOI: 10.1016/j.surfin.2025.108398
Kejia Jing, Haoran Du, Bo Jiang
An ultraviolet (UV) tubular formaldehyde (HCHO) catalytic sensing microreactor was fabricated by depositing arc-shaped Ag electrodes and a Pd-loaded TiO2 sensing film on the inner wall of a silica glass capillary tube. SEM, XRD, XPS, and HRTEM analysis disclosed that Pd nanoparticles were loaded onto TiO2 and the Pd-TiO2 film with thickness about 8.7 μm was formed by dip-coating method. The microreactor with the optimized Pd content in TiO2 exhibited a higher response value (158) toward 10 ppm HCHO, outperforming the Pd-TiO2 samples with other Pd contents. The sensor’s response to HCHO concentrations ranging from 100 ppb to 100 ppm followed an exponential function, while a high linear relationship (R² = 0.997) was observed in the low-concentration range of 100 ppb to 1 ppm concentrations with a detection limit of 8.7 ppb. Although the response to 10 ppm HCHO decreased with increasing relative humidity, the reactor maintained a response value of 29.5 at 85% RH, whereas the Pd-free sample exhibited a nearly zero response at 60% RH. The enhanced sensing performance was attributed to the microreactor`s the efficient gas-solid contact, the electronic/chemical sensitization and the cyclic redox reaction behavior of Pd/TiO2 under UV irradiation, which collectively enabled high sensitivity and humidity-resistant HCHO detection at room temperature.
{"title":"UV assisted tubular Ag electrodes/Pd-TiO2 catalytic sensing micro-reactor for room temperature high response and humidity resistant HCHO detection","authors":"Kejia Jing, Haoran Du, Bo Jiang","doi":"10.1016/j.surfin.2025.108398","DOIUrl":"10.1016/j.surfin.2025.108398","url":null,"abstract":"<div><div>An ultraviolet (UV) tubular formaldehyde (HCHO) catalytic sensing microreactor was fabricated by depositing arc-shaped Ag electrodes and a Pd-loaded TiO<sub>2</sub> sensing film on the inner wall of a silica glass capillary tube. SEM, XRD, XPS, and HRTEM analysis disclosed that Pd nanoparticles were loaded onto TiO<sub>2</sub> and the Pd-TiO<sub>2</sub> film with thickness about 8.7 μm was formed by dip-coating method. The microreactor with the optimized Pd content in TiO<sub>2</sub> exhibited a higher response value (158) toward 10 ppm HCHO, outperforming the Pd-TiO<sub>2</sub> samples with other Pd contents. The sensor’s response to HCHO concentrations ranging from 100 ppb to 100 ppm followed an exponential function, while a high linear relationship (R² = 0.997) was observed in the low-concentration range of 100 ppb to 1 ppm concentrations with a detection limit of 8.7 ppb. Although the response to 10 ppm HCHO decreased with increasing relative humidity, the reactor maintained a response value of 29.5 at 85% RH, whereas the Pd-free sample exhibited a nearly zero response at 60% RH. The enhanced sensing performance was attributed to the microreactor`s the efficient gas-solid contact, the electronic/chemical sensitization and the cyclic redox reaction behavior of Pd/TiO<sub>2</sub> under UV irradiation, which collectively enabled high sensitivity and humidity-resistant HCHO detection at room temperature.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108398"},"PeriodicalIF":6.3,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145898192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M-type barium hexaferrite (BaFe12O19) was synthesized via a self-sustaining solution combustion method followed by short-time calcination at 1000 °C. The obtained material exhibits a single-phase magnetoplumbite-type structure (P63/mmc) with a high degree of crystallinity and an average crystallite size of approximately 58 nm. SEM and EDX analyses confirmed a porous morphology and a stoichiometric Ba:Fe:O composition without detectable impurity phases. Raman spectroscopy and XPS investigations confirmed Fe3+ to be the dominant oxidation state, while surface-sensitive measurements indicate the presence of defect-modified oxygen-containing surface states that may contribute to localized electronic states within the band gap. Optical measurements revealed a direct band gap of 2.02 eV and an Urbach energy of 0.16 eV, indicating a moderate degree of structural disorder. Magnetic characterization showed a ferrimagnetic response with a high coercivity (Hc ≈ 3755 Oe) and a large magnetocrystalline anisotropy (Keff ≈ 2.9 × 106 erg/cm3), consistent with Mössbauer spectra that resolve five distinct Fe3+ sublattices (12k, 4f1, 4f2, 2a, 2b). The dielectric spectra exhibited a frequency- and temperature-dependent dispersion typical of ferrites, governed by Maxwell–Wagner interfacial polarization and hopping conduction between Fe2+/Fe3+ sites. The ac conductivity followed Jonscher’s power law and was dominated by a correlated barrier hopping (CBH) mechanism. The BaFe12O19 catalyst demonstrated pronounced activity in photocatalytic, sonocatalytic, and in particular sonophotocatalytic degradation of methylene blue (MB), reaching ≈ 92% decolorization within 60 min with an apparent rate constant of 0.0397 min-1.
The enhanced performance under combined light and ultrasonic irradiation originates from the interplay of photoexcitation, magnetostrictive and piezoelectric-like responses, and cavitation-induced charge modulation. Local band bending under acoustic deformation enables the participation of electrons in O2 reduction despite the nominally weakly reducing conduction band (ECB ≈ +0.20 eV), while defect-modified surface electronic states mediate efficient interfacial charge transfer. These findings reveal a synergistic activation mechanism in which hole-driven oxidation and electron-assisted radical generation coexist, highlighting BaFe12O19 as a multifunctional magneto-piezo-photocatalyst with stable dielectric and magnetic properties suitable for advanced environmental applications.
{"title":"Structural, dielectric, magnetic and sonophotocatalytic properties of M-type BaFe12O19 hexaferrite synthesized by solution combustion method","authors":"Nariman Alikhanov , Alina Rabadanova , Asiyat Magomedova , Magomed Abdulkerimov , Rashid Gyulakhmedov , Abdulatip Shuaibov , Daud Selimov , Dinara Sobola , Shikhgasan Ramazanov , Kamaludin Abdulvakhidov , Stanislav Kubrin , Farid Orudzhev","doi":"10.1016/j.surfin.2025.108404","DOIUrl":"10.1016/j.surfin.2025.108404","url":null,"abstract":"<div><div>M-type barium hexaferrite (BaFe<sub>12</sub>O<sub>19</sub>) was synthesized via a self-sustaining solution combustion method followed by short-time calcination at 1000 °C. The obtained material exhibits a single-phase magnetoplumbite-type structure (<em>P6<sub>3</sub>/mmc</em>) with a high degree of crystallinity and an average crystallite size of approximately 58 nm. SEM and EDX analyses confirmed a porous morphology and a stoichiometric Ba:Fe:O composition without detectable impurity phases. Raman spectroscopy and XPS investigations confirmed Fe<sup>3+</sup> to be the dominant oxidation state, while surface-sensitive measurements indicate the presence of defect-modified oxygen-containing surface states that may contribute to localized electronic states within the band gap. Optical measurements revealed a direct band gap of 2.02 eV and an Urbach energy of 0.16 eV, indicating a moderate degree of structural disorder. Magnetic characterization showed a ferrimagnetic response with a high coercivity (<em>H<sub>c</sub></em> ≈ 3755 Oe) and a large magnetocrystalline anisotropy (K<sub>eff</sub> ≈ 2.9 × 10<sup>6</sup> erg/cm<sup>3</sup>), consistent with Mössbauer spectra that resolve five distinct Fe<sup>3+</sup> sublattices (12<em>k</em>, 4<em>f</em><sub>1</sub>, 4<em>f</em><sub>2</sub>, 2<em>a</em>, 2<em>b</em>). The dielectric spectra exhibited a frequency- and temperature-dependent dispersion typical of ferrites, governed by Maxwell–Wagner interfacial polarization and hopping conduction between Fe<sup>2+</sup>/Fe<sup>3+</sup> sites. The ac conductivity followed Jonscher’s power law and was dominated by a correlated barrier hopping (CBH) mechanism. The BaFe<sub>12</sub>O<sub>19</sub> catalyst demonstrated pronounced activity in photocatalytic, sonocatalytic, and in particular sonophotocatalytic degradation of methylene blue (MB), reaching ≈ 92% decolorization within 60 min with an apparent rate constant of 0.0397 min<sup>-1</sup>.</div><div>The enhanced performance under combined light and ultrasonic irradiation originates from the interplay of photoexcitation, magnetostrictive and piezoelectric-like responses, and cavitation-induced charge modulation. Local band bending under acoustic deformation enables the participation of electrons in O<sub>2</sub> reduction despite the nominally weakly reducing conduction band (E<sub>CB</sub> ≈ +0.20 eV), while defect-modified surface electronic states mediate efficient interfacial charge transfer. These findings reveal a synergistic activation mechanism in which hole-driven oxidation and electron-assisted radical generation coexist, highlighting BaFe<sub>12</sub>O<sub>19</sub> as a multifunctional magneto-piezo-photocatalyst with stable dielectric and magnetic properties suitable for advanced environmental applications.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108404"},"PeriodicalIF":6.3,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-28DOI: 10.1016/j.surfin.2025.108390
Zhengfeng Shen , Jingjing Peng , Jianxin Liu , Yawen Wang , Yunfang Wang , Zhongde Wang , Caimei Fan , Rui Li , Jiancheng Wang
The highly selective photocatalytic oxidation of methane (CH4) to oxygenates remains challenging due to over-oxidation and low efficiency. Herein, a series of chromate-intercalated ZnTi-layered double hydroxide (CrO42--ZnTi-LDH, CZT-x) photocatalysts were constructed via a combined hydrothermal and anion-exchange method. Under simulated solar irradiation, the optimized CZT-30 catalyst achieves a remarkable oxygenates production rate of 2603.60 μmol g-1 h-1, which is 1.67 times higher than that of the pristine ZnTi-LDH, with nearly 100 % selectivity. This high selectivity (>92 %) is well maintained over a 9 h duration. Structural and spectroscopic analyses reveal that the intercalated CrO42- anions not only modulate the interlayer microenvironment and host electronic structure but also enhance light absorption and charge separation efficiency. In-situ EPR and Raman spectroscopy revealed that the CrO42- intercalation serves a dual function: it selectively boosts the generation of the key *OOH intermediate and enhances the hole-mediated activation of *CH4 to *CH3. This synergistic effect promotes the coupling of *CH3 and *OOH, leading to the highly selective production of oxygenates. This work provides a strategy for designing efficient LDH photocatalysts for selective methane valorization.
{"title":"Chromate intercalation in ZnTi-LDH for highly selective and efficient photocatalytic methane oxidation to oxygenates","authors":"Zhengfeng Shen , Jingjing Peng , Jianxin Liu , Yawen Wang , Yunfang Wang , Zhongde Wang , Caimei Fan , Rui Li , Jiancheng Wang","doi":"10.1016/j.surfin.2025.108390","DOIUrl":"10.1016/j.surfin.2025.108390","url":null,"abstract":"<div><div>The highly selective photocatalytic oxidation of methane (CH<sub>4</sub>) to oxygenates remains challenging due to over-oxidation and low efficiency. Herein, a series of chromate-intercalated ZnTi-layered double hydroxide (CrO<sub>4</sub><sup>2-</sup>-ZnTi-LDH, CZT-x) photocatalysts were constructed via a combined hydrothermal and anion-exchange method. Under simulated solar irradiation, the optimized CZT-30 catalyst achieves a remarkable oxygenates production rate of 2603.60 μmol g<sup>-1</sup> h<sup>-1</sup>, which is 1.67 times higher than that of the pristine ZnTi-LDH, with nearly 100 % selectivity. This high selectivity (>92 %) is well maintained over a 9 h duration. Structural and spectroscopic analyses reveal that the intercalated CrO<sub>4</sub><sup>2-</sup> anions not only modulate the interlayer microenvironment and host electronic structure but also enhance light absorption and charge separation efficiency. In-situ EPR and Raman spectroscopy revealed that the CrO<sub>4</sub><sup>2-</sup> intercalation serves a dual function: it selectively boosts the generation of the key *OOH intermediate and enhances the hole-mediated activation of *CH<sub>4</sub> to *CH<sub>3</sub>. This synergistic effect promotes the coupling of *CH<sub>3</sub> and *OOH, leading to the highly selective production of oxygenates. This work provides a strategy for designing efficient LDH photocatalysts for selective methane valorization.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108390"},"PeriodicalIF":6.3,"publicationDate":"2025-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-27DOI: 10.1016/j.surfin.2025.108389
Veronika K. Laurinavichyute , Eduard E. Levin , Alisa A. Mironkova , Andrei A. Eliseev , Leonid V. Pugolovkin
In this work we characterize mixed Mo-W acidic deposition solutions with Mo content ranging from 0 to 100 mol.% by Raman and UV–Vis spectroscopy. The obtained distribution diagram of mixed isopolyanions allows one to explain the observed change in film deposition rate with increase in Mo content. It was found that the initial decrease in deposition rate correlates with decrease in [W10O32]4− concentration, while the further increase in deposition rates correlates with the increase in [H3Mo3W15O60]9− complex concentration in deposition solutions. The EDX and UV–Vis analysis of film compositions confirms the preferential deposition of mixed oxotungstate film with Mo:W ratio ∼ 1:4 in solutions with >20 mol.% Mo. XRD and Raman confirmed that films consist of solid solutions with composition MoxW1-xO3·2H2O, with Mo fraction x ranging from 0 to 0.22. For the first time, the possibility of forming such single-phase solutions over a wide composition range was demonstrated. Potential-dependent optical absorption, coloration-decoloration kinetics, and capacity of the films are studied. Mo doping shifts the onset of coloration to more positive potentials and increases the optical density around 600 nm compared with undoped films. Although the coloration time increases slightly with Mo addition (from 1 to 3 s), the self-bleaching rate decreases by nearly an order of magnitude, indicating improved stability of the colored state.
{"title":"Electrodeposition and electrochromic properties of hydrated mixed oxides MoxW1-xO3·2H2O films","authors":"Veronika K. Laurinavichyute , Eduard E. Levin , Alisa A. Mironkova , Andrei A. Eliseev , Leonid V. Pugolovkin","doi":"10.1016/j.surfin.2025.108389","DOIUrl":"10.1016/j.surfin.2025.108389","url":null,"abstract":"<div><div>In this work we characterize mixed Mo-W acidic deposition solutions with Mo content ranging from 0 to 100 mol.% by Raman and UV–Vis spectroscopy. The obtained distribution diagram of mixed isopolyanions allows one to explain the observed change in film deposition rate with increase in Mo content. It was found that the initial decrease in deposition rate correlates with decrease in [W<sub>10</sub>O<sub>32</sub>]<sup>4</sup><sup>−</sup> concentration, while the further increase in deposition rates correlates with the increase in [H<sub>3</sub>Mo<sub>3</sub>W<sub>15</sub>O<sub>60</sub>]<sup>9−</sup> complex concentration in deposition solutions. The EDX and UV–Vis analysis of film compositions confirms the preferential deposition of mixed oxotungstate film with Mo:W ratio ∼ 1:4 in solutions with >20 mol.% Mo. XRD and Raman confirmed that films consist of solid solutions with composition Mo<sub>x</sub>W<sub>1-x</sub>O<sub>3</sub>·2H<sub>2</sub>O, with Mo fraction <em>x</em> ranging from 0 to 0.22. For the first time, the possibility of forming such single-phase solutions over a wide composition range was demonstrated. Potential-dependent optical absorption, coloration-decoloration kinetics, and capacity of the films are studied. Mo doping shifts the onset of coloration to more positive potentials and increases the optical density around 600 nm compared with undoped films. Although the coloration time increases slightly with Mo addition (from 1 to 3 s), the self-bleaching rate decreases by nearly an order of magnitude, indicating improved stability of the colored state.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108389"},"PeriodicalIF":6.3,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-26DOI: 10.1016/j.surfin.2025.108386
Anoop A V, Joel A Harock, Bagath Chandraprasad, Soney Varghese
The rapid and selective identification of volatile organic compounds (VOCs), particularly xylene, is crucial for environmental and occupational safety. Herein, we report a comparative investigation of Ti3C2Tx and Nb2CTx MXene-based Chemi-resistive sensors for low-ppm xylene detection at room temperature. Both MXenes were synthesized via selective HF etching of Ti3AlC2 and Nb2AlC MAX phases and thoroughly characterized using XRD, SEM, TEM, Raman, FTIR, and XPS to confirm successful Al removal, layered morphology, and surface terminations (–O, –OH, –F). The drop-cast thin films on platinum interdigitated electrodes exhibited stable, reversible, and concentration-dependent resistance changes across 3 ppm to 50 ppm xylene. Ti3C2Tx displayed a higher magnitude of response and steeper response-concentration slope (sensitivity) apart from lower limit of detection (8.22 ppm) in comparison with Nb2CTx (8.99 ppm), which can be attributed to its higher electrical conductivity, favourable 3d orbital–π electron coupling, and richer –O/–OH surface terminations that assist efficient charge transfer during adsorption. Both sensors displayed excellent linearity (R2 > 0.98), rapid response/recovery times (less than one minute), and robust repeatability over 30 days. Selectivity was tested by conducting experiments with other VOCs, and preferential adsorption of xylene was confirmed, which is consistent with enhanced π–π and dipole induced interactions on Ti3C2Tx. This study illustrated the structure, properties, performance relationships of MXene-based VOC sensors and underscores Ti3C2Tx as a promising candidate for room-temperature xylene monitoring with low-power consumption, in air quality determination and industrial safety applications.
{"title":"A comparative analysis of Ti3C2Tx and Nb2CTx MXenes for xylene detection","authors":"Anoop A V, Joel A Harock, Bagath Chandraprasad, Soney Varghese","doi":"10.1016/j.surfin.2025.108386","DOIUrl":"10.1016/j.surfin.2025.108386","url":null,"abstract":"<div><div>The rapid and selective identification of volatile organic compounds (VOCs), particularly xylene, is crucial for environmental and occupational safety. Herein, we report a comparative investigation of Ti<sub>3</sub>C<sub>2</sub>Tx and Nb<sub>2</sub>CTx MXene-based Chemi-resistive sensors for low-ppm xylene detection at room temperature. Both MXenes were synthesized via selective HF etching of Ti<sub>3</sub>AlC<sub>2</sub> and Nb<sub>2</sub>AlC MAX phases and thoroughly characterized using XRD, SEM, TEM, Raman, FTIR, and XPS to confirm successful Al removal, layered morphology, and surface terminations (–O, –OH, –F). The drop-cast thin films on platinum interdigitated electrodes exhibited stable, reversible, and concentration-dependent resistance changes across 3 ppm to 50 ppm xylene. Ti<sub>3</sub>C<sub>2</sub>Tx displayed a higher magnitude of response and steeper response-concentration slope (sensitivity) apart from lower limit of detection (8.22 ppm) in comparison with Nb<sub>2</sub>CTx (8.99 ppm), which can be attributed to its higher electrical conductivity, favourable 3d orbital–π electron coupling, and richer –O/–OH surface terminations that assist efficient charge transfer during adsorption. Both sensors displayed excellent linearity (R<sup>2</sup> > 0.98), rapid response/recovery times (less than one minute), and robust repeatability over 30 days. Selectivity was tested by conducting experiments with other VOCs, and preferential adsorption of xylene was confirmed, which is consistent with enhanced π–π and dipole induced interactions on Ti<sub>3</sub>C<sub>2</sub>Tx. This study illustrated the structure, properties, performance relationships of MXene-based VOC sensors and underscores Ti<sub>3</sub>C<sub>2</sub>Tx as a promising candidate for room-temperature xylene monitoring with low-power consumption, in air quality determination and industrial safety applications.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108386"},"PeriodicalIF":6.3,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, a first-principles study based on density functional theory was conducted to investigate the effect of 4d transition-metal (TM) doping on the CO adsorption properties of a silicon carbide (SiC) monolayer. Structural, electronic, charge transfer, electron localization function (ELF), work function, and recovery time analyses were performed. Pristine SiC was found to exhibit weak physisorption toward CO, which limits its use in CO gas applications. In contrast, 4d TM doping enhanced both adsorption strength and sensitivity. CO molecules chemisorbed on Y-, Zr-, Nb-, Mo-, Ru-, and Rh-doped SiC with strong binding, while Pd- and Ag-doped SiC exhibited physisorption behavior. Cd-doped SiC showed negligible interaction with CO. Work function shifts upon CO adsorption on Y-, Zr-, Nb-, Mo-, Ru-, Rh-, and Pd-doped SiC confirmed the potential of these systems for work function–based sensors. Recovery time evaluation further indicated that these systems can function effectively as CO gas sensors.
{"title":"Enhancing CO adsorption on silicon carbide monolayers via 4d transition metal doping: A DFT study for gas sensing applications","authors":"Abdellatif Abdesselem , Chaouki Siouani , Sofiane Mahtout , Ali Alouache","doi":"10.1016/j.surfin.2025.108382","DOIUrl":"10.1016/j.surfin.2025.108382","url":null,"abstract":"<div><div>In this work, a first-principles study based on density functional theory was conducted to investigate the effect of 4d transition-metal (TM) doping on the CO adsorption properties of a silicon carbide (SiC) monolayer. Structural, electronic, charge transfer, electron localization function (ELF), work function, and recovery time analyses were performed. Pristine SiC was found to exhibit weak physisorption toward CO, which limits its use in CO gas applications. In contrast, 4d TM doping enhanced both adsorption strength and sensitivity. CO molecules chemisorbed on Y-, Zr-, Nb-, Mo-, Ru-, and Rh-doped SiC with strong binding, while Pd- and Ag-doped SiC exhibited physisorption behavior. Cd-doped SiC showed negligible interaction with CO. Work function shifts upon CO adsorption on Y-, Zr-, Nb-, Mo-, Ru-, Rh-, and Pd-doped SiC confirmed the potential of these systems for work function–based sensors. Recovery time evaluation further indicated that these systems can function effectively as CO gas sensors.</div></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":"81 ","pages":"Article 108382"},"PeriodicalIF":6.3,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145898191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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