Pub Date : 2024-09-27DOI: 10.1016/j.materresbull.2024.113111
Spinel Li4Ti5O12 (LTO) is a promising anode material for solid state thin film batteries (SSTB) due to its almost-zero volume change and promising Li-ion mobility. However, preparing LTO anodes for SSTB demands tedious vacuum-based processing steps that are not cost effective. In this context, the present study embarks on evaluating the versatile suspension plasma spraying (SPS) approach to fabricate LTO coatings without using any binder. The microstructure and stoichiometry of the fabricated LTO coatings developed through the SPS route reveals retention of ∼76 wt.% of the spinel LTO from the starting feedstock, with minor amounts of rutile and anatase TiO2. The SPS experiments yielded varying thickness build up rates of the LTO coatings depending on the processing parameters adopted. The electrochemical data of the produced LTO based electrode tested in a half-cell through galvanostatic cycling show reversible lithiation and delithiation at expected potential, thereby validating the promise of the SPS technique for potential fabrication of SSTB components once fully optimized.
{"title":"Facile one-step fabrication of Li4Ti5O12 coatings by suspension plasma spraying","authors":"","doi":"10.1016/j.materresbull.2024.113111","DOIUrl":"10.1016/j.materresbull.2024.113111","url":null,"abstract":"<div><div>Spinel Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) is a promising anode material for solid state thin film batteries (SSTB) due to its almost-zero volume change and promising Li-ion mobility. However, preparing LTO anodes for SSTB demands tedious vacuum-based processing steps that are not cost effective. In this context, the present study embarks on evaluating the versatile suspension plasma spraying (SPS) approach to fabricate LTO coatings without using any binder. The microstructure and stoichiometry of the fabricated LTO coatings developed through the SPS route reveals retention of ∼76 wt.% of the spinel LTO from the starting feedstock, with minor amounts of rutile and anatase TiO<sub>2</sub>. The SPS experiments yielded varying thickness build up rates of the LTO coatings depending on the processing parameters adopted. The electrochemical data of the produced LTO based electrode tested in a half-cell through galvanostatic cycling show reversible lithiation and delithiation at expected potential, thereby validating the promise of the SPS technique for potential fabrication of SSTB components once fully optimized.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.materresbull.2024.113110
A nanoporous Co3S4/BiVO4 composites were successfully fabricated via electrodeposition, immersion and oil-bath heating methods. ZIF-67 was used as a cobalt source and template. Co3S4/BiVO4 obtained by treatment for 6 h displayed the best photocathodic protection (PCP) performance. Under light, Co3S4–6 h/BiVO4 reduced the potential of 304 stainless steel (SS) to −490 mV vs. SCE, which was 200 mV below that of pure BiVO4. In addition, the photocurrent densities of 304 SS coupled with Co3S4–6 h/BiVO4 were up to 13 μA cm−2, which was more than 4 times that of pure BiVO4. Remarkably, the Rct of 304 SS coupled with Co3S4–6h/BiVO4 (142.6 Ω·cm2) was 1/27 of that of pure BiVO4 (3918 Ω·cm2). The outstanding PCP property of Co3S4/BiVO4 can be owed to the synergistic effects of strong visible light absorption, improved charge transfer efficiency, and enhanced electron storage capacity. These advantages make Co3S4/BiVO4 a promising candidate for providing effective PCP effects on metals.
{"title":"Enhanced photocathodic protection performance of Co3S4 nanoparticles modified porous BiVO4 composites for 304 stainless steel","authors":"","doi":"10.1016/j.materresbull.2024.113110","DOIUrl":"10.1016/j.materresbull.2024.113110","url":null,"abstract":"<div><div>A nanoporous Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> composites were successfully fabricated via electrodeposition, immersion and oil-bath heating methods. ZIF-67 was used as a cobalt source and template. Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> obtained by treatment for 6 h displayed the best photocathodic protection (PCP) performance. Under light, Co<sub>3</sub>S<sub>4</sub>–6 h/BiVO<sub>4</sub> reduced the potential of 304 stainless steel (SS) to −490 mV vs. SCE, which was 200 mV below that of pure BiVO<sub>4</sub>. In addition, the photocurrent densities of 304 SS coupled with Co<sub>3</sub>S<sub>4</sub>–6 h/BiVO<sub>4</sub> were up to 13 μA cm<sup>−2</sup>, which was more than 4 times that of pure BiVO<sub>4</sub>. Remarkably, the <em>R</em><sub>ct</sub> of 304 SS coupled with Co<sub>3</sub>S<sub>4</sub>–6h/BiVO<sub>4</sub> (142.6 Ω·cm<sup>2</sup>) was 1/27 of that of pure BiVO<sub>4</sub> (3918 Ω·cm<sup>2</sup>). The outstanding PCP property of Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> can be owed to the synergistic effects of strong visible light absorption, improved charge transfer efficiency, and enhanced electron storage capacity. These advantages make Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> a promising candidate for providing effective PCP effects on metals.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-25DOI: 10.1016/j.materresbull.2024.113105
This study probes the enhancement of the microwave, ferroelectric and electromechanical properties of electroactive polymer (EAP) blended films made out of P(VDF-TrFE) and Nafion. Blended films are synthesized using the solution casting method, with different Nafion volume percentage (0 % to 30 %), and the phase formation is confirmed using XRD and FTIR spectroscopy. The morphological features are studied using FESEM. The reflection loss of the blended films as a function of thickness has been studied in both X and Ku band using a VNA. The contribution of reflection and absorption to the shielding effectiveness are also explored. 10 % Nafion inclusion effectively minimizes microwave reflection. The P-E hysteresis study reveals that the blended films exhibit high performance in terms of the parameters. The electromechanical coupling factor has been enhanced for 10 % Nafion inclusion. These findings suggest that the blended films have potential applications in flexible piezoelectric sensors, capacitors, memory, and microwave devices.
{"title":"Microwave, ferroelectric and electromechanical studies of free standing blended electroactive polymer films","authors":"","doi":"10.1016/j.materresbull.2024.113105","DOIUrl":"10.1016/j.materresbull.2024.113105","url":null,"abstract":"<div><div>This study probes the enhancement of the microwave, ferroelectric and electromechanical properties of electroactive polymer (EAP) blended films made out of P(VDF-TrFE) and Nafion. Blended films are synthesized using the solution casting method, with different Nafion volume percentage (0 % to 30 %), and the phase formation is confirmed using XRD and FTIR spectroscopy. The morphological features are studied using FESEM. The reflection loss of the blended films as a function of thickness has been studied in both X and Ku band using a VNA. The contribution of reflection and absorption to the shielding effectiveness are also explored. 10 % Nafion inclusion effectively minimizes microwave reflection. The P-E hysteresis study reveals that the blended films exhibit high performance in terms of the parameters. The electromechanical coupling factor has been enhanced for 10 % Nafion inclusion. These findings suggest that the blended films have potential applications in flexible piezoelectric sensors, capacitors, memory, and microwave devices.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-22DOI: 10.1016/j.materresbull.2024.113106
The present study reports on the enhanced photocatalytic and chemocatalytic performance of ZnO/carbon dots (CDs) nanocomposites for the degradation of methylene blue (MB) dye. Carbon quantum dots were prepared by employing Moringa oleifera gum powder as a carbon source through the hydrothermal process. ZnO/CQDs nanocomposites were synthesized by dispersing ZnO nanoparticles into carbon quantum dot solution. The obtained samples were characterized by using techniques like FTIR, UV, and SEM with EDX analysis. When the methylene blue (MB) dye was exposed to visible light at room temperature, the ZnO/CQDs nanocomposites photocatalyst exhibited more photocatalytic and chemocatalytic activity than the pure ZnO nanoparticle photocatalyst. Antibacterial activity and cytotoxic assay of ZnO/CQDs nanocomposites were also investigated. In addition to protecting the environment, the purpose of this research is to create a new visible-light photocatalyst for the effective treatment of organic wastewater.
{"title":"ZnO/carbon quantum dots nanocomposites derived from Moringa oleifera gum: An improved catalytic vitiation of methylene blue dye","authors":"","doi":"10.1016/j.materresbull.2024.113106","DOIUrl":"10.1016/j.materresbull.2024.113106","url":null,"abstract":"<div><div>The present study reports on the enhanced photocatalytic and chemocatalytic performance of ZnO/carbon dots (CDs) nanocomposites for the degradation of methylene blue (MB) dye. Carbon quantum dots were prepared by employing Moringa oleifera gum powder as a carbon source through the hydrothermal process. ZnO/CQDs nanocomposites were synthesized by dispersing ZnO nanoparticles into carbon quantum dot solution. The obtained samples were characterized by using techniques like FTIR, UV, and SEM with EDX analysis. When the methylene blue (MB) dye was exposed to visible light at room temperature, the ZnO/CQDs nanocomposites photocatalyst exhibited more photocatalytic and chemocatalytic activity than the pure ZnO nanoparticle photocatalyst. Antibacterial activity and cytotoxic assay of ZnO/CQDs nanocomposites were also investigated. In addition to protecting the environment, the purpose of this research is to create a new visible-light photocatalyst for the effective treatment of organic wastewater.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-21DOI: 10.1016/j.materresbull.2024.113098
The novel Dy3+-doped NaMgLaTeO6 (NaMgLaTeO6:Dy3+) phosphors were produced through a high-temperature solid-state reaction. X-ray diffraction (XRD) analysis and Rietveld refinement manifest that the pure phosphor was committed to the space group (P21/m (11)) and features the double perovskite structure. The band gap (Eg) of the direct semiconductor NaMgLaTeO6 is calculated to be 2.065 eV. Under 388 nm excitation, the 4F9/2→6H13/2 energy level transition contributes to the maximum emission peak at 572 nm. Other properties of the phosphor include optimal concentration (x = 5 mol %), high thermal stability, activation energy (Ea = 0.31 eV), and internal quantum efficiency (IQE = 31.44 %). The relevant color coordinate of the white light emitting diode (w-LED) prepared by the phosphor is (0.298, 0.311). The features of the latent fingerprint (LFP) created by NaMgLaTeO6:Dy3+ can be clearly reflected on different surfaces. In summary, NaMgLaTeO6:Dy3+ phosphor has proven high potential in w-LEDs production and LFP detection.
{"title":"Thermal stable NaMgLaTeO6:Dy3+ double perovskite yellow phosphors for w-LEDs and latent fingerprint visualization","authors":"","doi":"10.1016/j.materresbull.2024.113098","DOIUrl":"10.1016/j.materresbull.2024.113098","url":null,"abstract":"<div><p>The novel Dy<sup>3+</sup>-doped NaMgLaTeO<sub>6</sub> (NaMgLaTeO<sub>6</sub>:Dy<sup>3+</sup>) phosphors were produced through a high-temperature solid-state reaction. X-ray diffraction (XRD) analysis and Rietveld refinement manifest that the pure phosphor was committed to the space group (P2<em><sub>1/m</sub></em> (11)) and features the double perovskite structure. The band gap (<em>E</em><sub>g</sub>) of the direct semiconductor NaMgLaTeO<sub>6</sub> is calculated to be 2.065 eV. Under 388 nm excitation, the <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>13/2</sub> energy level transition contributes to the maximum emission peak at 572 nm. Other properties of the phosphor include optimal concentration (<em>x</em> = 5 mol %), high thermal stability, activation energy (<em>E</em><sub>a</sub> = 0.31 eV), and internal quantum efficiency (IQE = 31.44 %). The relevant color coordinate of the white light emitting diode (w-LED) prepared by the phosphor is (0.298, 0.311). The features of the latent fingerprint (LFP) created by NaMgLaTeO<sub>6</sub>:Dy<sup>3+</sup> can be clearly reflected on different surfaces. In summary, NaMgLaTeO<sub>6</sub>:Dy<sup>3+</sup> phosphor has proven high potential in w-LEDs production and LFP detection.</p></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S002554082400429X/pdfft?md5=15c860797c7fcefc556b6c7c2a8f1427&pid=1-s2.0-S002554082400429X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.materresbull.2024.113104
The Zr-based metal-organic framework UiO-66-NH2 has been investigated to study the effects of ultraviolet and visible light exposure under dry air and humid environments. Significant impedance and color changes in the material due to ultraviolet and blue light have been observed. These changes happen more rapidly and grow larger in total cumulative magnitude as the atmospheric humidity increases. Samples placed in darkness or in the presence of light with lower energy than blue (450 nm) light showed no discoloration or degradation, regardless of humidity. Impedance data modeling suggests that humidity increases the ionic conductivity of the material and that the degradation occurs at grain boundaries, to a depth that increases with humidity. Nuclear magnetic resonance, X-ray diffraction, and Fourier transform infrared spectroscopy indicate that degradation in samples exposed to light are due to broken linkers between the benzenedicarboxylic acid and Zr clusters. Distribution Statement A. Approved for Public Release. Distribution Unlimited.
{"title":"Humidity-enhanced photodegradation mechanism of UiO-66-NH2 metal organic framework","authors":"","doi":"10.1016/j.materresbull.2024.113104","DOIUrl":"10.1016/j.materresbull.2024.113104","url":null,"abstract":"<div><div>The Zr-based metal-organic framework UiO-66-NH<sub>2</sub> has been investigated to study the effects of ultraviolet and visible light exposure under dry air and humid environments. Significant impedance and color changes in the material due to ultraviolet and blue light have been observed. These changes happen more rapidly and grow larger in total cumulative magnitude as the atmospheric humidity increases. Samples placed in darkness or in the presence of light with lower energy than blue (450 nm) light showed no discoloration or degradation, regardless of humidity. Impedance data modeling suggests that humidity increases the ionic conductivity of the material and that the degradation occurs at grain boundaries, to a depth that increases with humidity. Nuclear magnetic resonance, X-ray diffraction, and Fourier transform infrared spectroscopy indicate that degradation in samples exposed to light are due to broken linkers between the benzenedicarboxylic acid and Zr clusters. Distribution Statement A. Approved for Public Release. Distribution Unlimited.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025540824004355/pdfft?md5=39c5d2c4f5931f1d4d5919e4684122ce&pid=1-s2.0-S0025540824004355-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-18DOI: 10.1016/j.materresbull.2024.113103
We report the structural and superconducting properties of Ge-intercalated 2H–NbSe2 polycrystals. GexNbSe2 samples with nominal 0 ≤ x ≤ 0.1 crystallize in the space group P63/mmc with Ge disorderedly occupying the interlayer Se6 octahedral interstices. Superconducting critical temperature Tc monotonically decreases from 7.2 K in NbSe2 to 4.9 K in Ge0.1NbSe2. Studies on resistivity, magnetization and specific heat derive the superconducting- and normal-state parameters, indicating that the suppression of the two-gap superconductivity is mostly caused by the lowered electron-phonon coupling parameter λe-p and density of states at the Fermi level N(EF). Surprisingly, the upper critical field Hc2 and irreversible field Hirr of the low Ge-level samples are enhanced compared with those of the undoped one, which may ascribe to the electron scattering and vortex pinning by nonmagnetic Ge. This study suggests the feasibility for improving high-field performance by slight impurity doping and advances the understanding of superconductivity in transition-metal dichalcogenides.
{"title":"Experimental investigation on the crystal structure and superconductivity of germanium-intercalated 2H–NbSe2 system","authors":"","doi":"10.1016/j.materresbull.2024.113103","DOIUrl":"10.1016/j.materresbull.2024.113103","url":null,"abstract":"<div><div>We report the structural and superconducting properties of Ge-intercalated 2H–NbSe<sub>2</sub> polycrystals. Ge<em><sub>x</sub></em>NbSe<sub>2</sub> samples with nominal 0 ≤ <em>x</em> ≤ 0.1 crystallize in the space group <em>P</em>6<sub>3</sub>/<em>mmc</em> with Ge disorderedly occupying the interlayer Se<sub>6</sub> octahedral interstices. Superconducting critical temperature <em>T</em><sub>c</sub> monotonically decreases from 7.2 K in NbSe<sub>2</sub> to 4.9 K in Ge<sub>0.1</sub>NbSe<sub>2</sub>. Studies on resistivity, magnetization and specific heat derive the superconducting- and normal-state parameters, indicating that the suppression of the two-gap superconductivity is mostly caused by the lowered electron-phonon coupling parameter <em>λ</em><sub>e-p</sub> and density of states at the Fermi level <em>N</em>(<em>E</em><sub>F</sub>). Surprisingly, the upper critical field <em>H</em><sub>c2</sub> and irreversible field <em>H</em><sub>irr</sub> of the low Ge-level samples are enhanced compared with those of the undoped one, which may ascribe to the electron scattering and vortex pinning by nonmagnetic Ge. This study suggests the feasibility for improving high-field performance by slight impurity doping and advances the understanding of superconductivity in transition-metal dichalcogenides.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025540824004343/pdfft?md5=2e7f0e840357c68865532bae998d0468&pid=1-s2.0-S0025540824004343-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-16DOI: 10.1016/j.materresbull.2024.113100
Here in, we adopted a simplistic approach for the design and tailoring of novel nanocomposite Fe2(MoO4)3/FeS (FMO/FeS). The nanocomposite effectively maintains its structural stability, enabling the sensor to work throughout a lengthy linear range. And for the first time, this hybrid material decorated glassy carbon electrode (GCE) utilized for homocysteine (Hcy) quantification. The selective interaction between the material loaded on the electrode surface and -SH group in the homocysteine can be characterized by a variation in the anodic peak and the faster current output. The FMO/FeS facilitate rapid electron transfer between the electrolyte and electrode, allowing for easy detection of homocysteine. The homocysteine undergoes oxidation in the presence of electron acceptor, releasing an electron from thiol group. The extraordinary electrochemical activity attributed by FMO/FeS nanocomposite accelerated the overall performance of sensor towards the selected analyte. The novel sensor illustrated an exceptional linear range of 13–9061 μM for Hcy detection and it is greater than reported in studies till now to the best of our knowledge with limit of detection (LOD) value of 0.05 µM. The reproducibility and repeatability analysis of the unique sensor exhibited admirable results whereas the sensor demonstrated noteworthy selectivity towards desired analyte in the presence of potential interferants. Additionally, the practical application of the sensor assessed by analysing Hcy in blood serum specimen as well as in urine and exhibited remarkable recovery rates. This paving way for the development of comprehensive technologies for proper health care for future.
{"title":"Tailoring of Fe2(MoO4)3/FeS nanocomposite to decorate glassy carbon electrode for the electrochemical quantification of homocysteine in human serum","authors":"","doi":"10.1016/j.materresbull.2024.113100","DOIUrl":"10.1016/j.materresbull.2024.113100","url":null,"abstract":"<div><p>Here in, we adopted a simplistic approach for the design and tailoring of novel nanocomposite Fe<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub>/FeS (FMO/FeS). The nanocomposite effectively maintains its structural stability, enabling the sensor to work throughout a lengthy linear range. And for the first time, this hybrid material decorated glassy carbon electrode (GCE) utilized for homocysteine (Hcy) quantification. The selective interaction between the material loaded on the electrode surface and -SH group in the homocysteine can be characterized by a variation in the anodic peak and the faster current output. The FMO/FeS facilitate rapid electron transfer between the electrolyte and electrode, allowing for easy detection of homocysteine. The homocysteine undergoes oxidation in the presence of electron acceptor, releasing an electron from thiol group. The extraordinary electrochemical activity attributed by FMO/FeS nanocomposite accelerated the overall performance of sensor towards the selected analyte. The novel sensor illustrated an exceptional linear range of 13–9061 μM for Hcy detection and it is greater than reported in studies till now to the best of our knowledge with limit of detection (LOD) value of 0.05 µM. The reproducibility and repeatability analysis of the unique sensor exhibited admirable results whereas the sensor demonstrated noteworthy selectivity towards desired analyte in the presence of potential interferants. Additionally, the practical application of the sensor assessed by analysing Hcy in blood serum specimen as well as in urine and exhibited remarkable recovery rates. This paving way for the development of comprehensive technologies for proper health care for future.</p></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025540824004318/pdfft?md5=2b5eb29b2fcf37cf5df09adaa7d0fd82&pid=1-s2.0-S0025540824004318-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-16DOI: 10.1016/j.materresbull.2024.113102
A series of red-emitting composite based on carbon dots in β-Ca2SiO4:Eu3+ (CDs@CSO:Eu3+) nanocomposites (NCs) were synthesized through a solid state (SS) method, aiming to enhance applications in latent fingerprints (LFPs), lip prints (LPs) detection, anti-counterfeiting (AC) techniques and optical thermometry. The powdered X-ray diffraction (PXRD) analysis confirmed the monoclinic crystal structure of the phosphor. Under 394 nm excitation, the Eu3+ doped β-CSO:Eu3+ display a broad red emission peak at 615 nm, attributed to the 5D0→7F2 transition of Eu3+ ions. The optimal concentration of Eu3+ ions is determined to be 3 mol %, as higher concentrations led to a decrease in photoluminescence (PL) emission intensity due to concentration quenching (CQ). Additionally, a fabricated white light emitting diode (w-LED) using these phosphors achieved chromaticity coordinates of (0.355, 0.352) according to the Commission International de L'Eclairage (CIE), with the CIE, correlated colour temperature (CCT), and colour purity (CP) metrics indicating a bright green output with values of (0.6122, 0.3499), 1177 K, and 88.7%, respectively. The optimized 3wt % CDs@β-CSO:3Eu3+ composite demonstrated a remarkable CP of 97.7 %. Notably, the composite maintained 92.6 % of their emission intensity at 420 K, showcasing exceptional thermal stability. The internal quantum efficiency (IQE) is an impressive 85.8%, demonstrating the effectiveness of the process. This study explores the application of composite materials for LFPs detection and cheiloscopy. Utilizing advanced phosphor composites, we achieved enhanced visualization of fingerprints (FPs) features, including level I (ridge patterns), level II (minutiae points), and level III (ridge details such as pores and scars). Additionally, the composite's efficacy is demonstrated in cheiloscopy, capturing detailed LPs across type I to VI categories. The results highlight the composite's superior performance in both fingerprint and LP analysis, offering improved resolution and reliability for forensic applications. In addition, a novel approach is employed via brush mode to create AC patterns using optimized security ink. The resulting AC tags featured high resolution and durability. These findings underscore the 3wt%CDs@β-CSO:3Eu3+ composite as superior luminescent materials for use in fields requiring LFP, AC strategies, and optical thermometry.
通过固态（SS）方法合成了一系列基于β-Ca2SiO4:Eu3+（CDs@CSO:Eu3+）纳米碳点的红色发光复合材料（NCs），旨在提高其在潜伏指纹（LFPs）、唇印（LPs）检测、防伪（AC）技术和光学测温中的应用。粉末 X 射线衍射（PXRD）分析证实了荧光粉的单斜晶体结构。在 394 nm 激发下，掺杂 Eu3+ 的 β-CSO:Eu3+ 在 615 nm 处显示出宽广的红色发射峰，这归因于 Eu3+ 离子的 5D0→7F2 转变。Eu3+ 离子的最佳浓度被确定为 3 摩尔%，因为浓度越高，浓度淬灭（CQ）导致的光致发光（PL）发射强度越低。此外，根据国际照明委员会（CIE）的标准，使用这些荧光粉制造的白光发光二极管（w-LED）的色度坐标为（0.355, 0.352），CIE、相关色温（CCT）和色纯度（CP）指标显示其输出为亮绿色，其值分别为（0.6122, 0.3499）、1177 K 和 88.7%。经过优化的 3wt % CDs@β-CSO:3Eu3+ 复合材料的 CP 值高达 97.7%。值得注意的是，该复合材料在 420 K 时仍能保持 92.6% 的发射强度，显示出卓越的热稳定性。内部量子效率（IQE）达到了令人印象深刻的 85.8%，证明了该工艺的有效性。本研究探讨了复合材料在 LFPs 检测和螯合镜方面的应用。利用先进的荧光粉复合材料，我们增强了指纹（FPs）特征的可视化，包括 I 级（脊纹）、II 级（微切点）和 III 级（脊纹细节，如气孔和疤痕）。此外，该复合材料在纤支镜中的功效也得到了证明，它能捕捉到从 I 型到 VI 型的详细 LP。结果凸显了复合材料在指纹和 LP 分析中的卓越性能，为法医应用提供了更高的分辨率和可靠性。此外，还采用了一种新颖的方法，即使用优化的防伪油墨，通过笔刷模式创建 AC 图案。由此产生的 AC 标签具有高分辨率和耐用性的特点。这些研究结果表明，3wt%CDs@β-CSO:3Eu3+ 复合材料是一种优异的发光材料，可用于需要 LFP、AC 策略和光学温度计的领域。
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Pub Date : 2024-09-15DOI: 10.1016/j.materresbull.2024.113101
Much attention has been focused on the fabrication of TiO2 microspheres due to their excellent properties and attractive potential in many fields. Here, undoped 3D hierarchical TiO2 microspheres (TMS) were synthesized in situ on Ti mesh using a hydrothermal method by varying NaOH concentration, reaction time and temperature. The 3D TMS grown along the surface of the woven wires of the Ti meshes, using the metal Ti meshes as a substrate, which resulted in improved conductivity. Meanwhile, the original Ti mesh with the macroporosity (due to the 15 % open area of the mesh) can act as fast proton mass diffusion. As a result, the flexible TMS-Ti photoelectrodes exhibit an excellent current density of 1.63 mA/cm2 at a potential of 1.23 V (vs Ag/AgCl). Therefore, the in situ synthesis of TiO2 microspheres on Ti mesh is highly desirable for flexible devices.
由于二氧化钛微球具有优异的性能和在许多领域的巨大潜力，其制备一直备受关注。本文采用水热法，通过改变 NaOH 浓度、反应时间和温度，在钛网上原位合成了未掺杂的三维分层 TiO2 微球（TMS）。三维 TMS 以金属 Ti 网为基底，沿着 Ti 网的编织线表面生长，从而提高了导电性。同时，具有大孔隙率的原始 Ti 网（由于网的开口面积为 15%）可以起到快速质子质量扩散的作用。因此，柔性 TMS-Ti 光电极在 1.23 V 的电位（相对于 Ag/AgCl）下可显示出 1.63 mA/cm2 的出色电流密度。因此，在钛网上原位合成二氧化钛微球对于柔性设备来说是非常理想的。
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