Pub Date : 2026-04-01Epub Date: 2025-12-23DOI: 10.1016/j.materresbull.2025.113975
Xiaopeng Miao , Fanshi Meng , Xinxin Xu , Jiahui Wang , Xinyu Wang , Jian Tian
CuNi alloy nanoparticles loaded on nitrogen-doped carbon nanotubes (CuNi@NC) were synthesized by using a Cu-Ni binary metal MOF as the precursor and adding melamine as an additional nitrogen source through high-temperature pyrolysis. At -1.0 V vs. RHE, the Faraday efficiency (FE) of CO produced by CuNi@NC reaches 95.5%, which is much higher than that of Cu@NC(FECO: 14.0%) and Ni@NC(FECO: 37.0%). In-situ infrared spectra shows that the excellent ECO2RR property of CuNi@NC is attributed to the reconfiguration of the electronic structure of the binary alloy catalyst, which increases the adsorption energy for CO2 and promotes the desorption of *CO. This study explores and expands new paths for the synthesis of alloy catalysts.
以Cu-Ni二元金属MOF为前驱体，添加三聚氰胺作为附加氮源，通过高温热解制备了氮掺杂碳纳米管（CuNi@NC）上的CuNi合金纳米颗粒。在-1.0 V vs. RHE下，CuNi@NC产CO的法拉第效率（FE）达到95.5%，远高于Cu@NC（FECO: 14.0%）和Ni@NC（FECO: 37.0%）。原位红外光谱分析表明，CuNi@NC优异的ECO2RR性能是由于二元合金催化剂的电子结构重构，提高了对CO2的吸附能，促进了*CO的解吸。本研究为合金催化剂的合成开辟了新的途径。
{"title":"MOF-derived nitrogen-doped carbon nanotubes supported CuNi alloy for electrocatalytic reduction of CO2 to CO","authors":"Xiaopeng Miao , Fanshi Meng , Xinxin Xu , Jiahui Wang , Xinyu Wang , Jian Tian","doi":"10.1016/j.materresbull.2025.113975","DOIUrl":"10.1016/j.materresbull.2025.113975","url":null,"abstract":"<div><div>CuNi alloy nanoparticles loaded on nitrogen-doped carbon nanotubes (CuNi@N<img>C) were synthesized by using a Cu-Ni binary metal MOF as the precursor and adding melamine as an additional nitrogen source through high-temperature pyrolysis. At -1.0 V <em>vs.</em> RHE, the Faraday efficiency (FE) of CO produced by CuNi@N<img>C reaches 95.5%, which is much higher than that of Cu@N<img>C(FE<sub>CO</sub>: 14.0%) and Ni@N<img>C(FE<sub>CO</sub>: 37.0%). <em>In-situ</em> infrared spectra shows that the excellent ECO<sub>2</sub>RR property of CuNi@N<img>C is attributed to the reconfiguration of the electronic structure of the binary alloy catalyst, which increases the adsorption energy for CO<sub>2</sub> and promotes the desorption of *CO. This study explores and expands new paths for the synthesis of alloy catalysts.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113975"},"PeriodicalIF":5.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881055","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}
Single zinc oxide nano-rods (ZnO NRs) and sputtered molybdenum (Mo) ZnO NRs were prepared, respectively, through the same sulfurization process. The purpose of doing so was to obtain diffusion reaction blocked zinc sulfide (ZnS) and nano-2D layered molybdenum sulfide (MoS2) modified ZnO NRs. Following this, electroplated cuprous oxide (Cu2O) was employed to complete two hetero-structure non-enzymatic glucose sensing electrodes. Based on the experimental results, 2D layered MoS2-modified ZnO NRs grow into a bamboo-like nodular structure to increase not only the contact area but also the independent electron exchange channels. Comparing the two modified electrodes of ZnS and MoS2, the sensitivity of cyclic voltammetry (CVs) increased from 396 to 680.4, and the fitting superiority R2 value increased from 0.985 to 0.993. Finally, the chronoamperometry measurement of the MoS2 modified sensing electrode obtained two linear ranges of low and high concentrations, which are 1600 (0–5.556 mM) and 722.3 μAmM-1 cm-2 (5.556 -11.11 mM), respectively.
采用相同的硫化工艺，分别制备了单氧化锌纳米棒（ZnO NRs）和溅射氧化锌纳米棒（Mo）。这样做的目的是获得扩散反应阻断的硫化锌（ZnS）和纳米2d层状硫化钼（MoS2）修饰的ZnO NRs。随后，电镀氧化亚铜（Cu2O）完成了两个异质结构非酶促葡萄糖传感电极。实验结果表明，二维层状mos2修饰的ZnO纳米管生长成竹节状结构，不仅增加了接触面积，而且增加了独立的电子交换通道。ZnS和MoS2两种修饰电极相比，循环伏安法（cv）的灵敏度从396提高到680.4，拟合优势R2从0.985提高到0.993。最后，对改性的MoS2传感电极进行时序电流测量，得到了低、高浓度的两个线性范围，分别为1600 μ am -1 cm-2 （5.556 ~ 11.11 mM）和722.3 μ am -1 cm-2。
{"title":"Two-dimensional layered molybdenum sulfide modified cuprous oxide/zinc oxide nanorod non-enzymatic glucose sensing electrode: Nodule mechanism and bandgap matching","authors":"Hsi-Chao Chen , An-Hsiung Zheng , Ying-Sheng Lin , Hui-Hsiu Chang","doi":"10.1016/j.materresbull.2025.113947","DOIUrl":"10.1016/j.materresbull.2025.113947","url":null,"abstract":"<div><div>Single zinc oxide nano-rods (ZnO NRs) and sputtered molybdenum (Mo) ZnO NRs were prepared, respectively, through the same sulfurization process. The purpose of doing so was to obtain diffusion reaction blocked zinc sulfide (ZnS) and nano-2D layered molybdenum sulfide (MoS<sub>2</sub>) modified ZnO NRs. Following this, electroplated cuprous oxide (Cu<sub>2</sub>O) was employed to complete two hetero-structure non-enzymatic glucose sensing electrodes. Based on the experimental results, 2D layered MoS<sub>2</sub>-modified ZnO NRs grow into a bamboo-like nodular structure to increase not only the contact area but also the independent electron exchange channels. Comparing the two modified electrodes of ZnS and MoS<sub>2</sub>, the sensitivity of cyclic voltammetry (CVs) increased from 396 to 680.4, and the fitting superiority R<sup>2</sup> value increased from 0.985 to 0.993. Finally, the chronoamperometry measurement of the MoS<sub>2</sub> modified sensing electrode obtained two linear ranges of low and high concentrations, which are 1600 (0–5.556 mM) and 722.3 μAmM<sup>-1</sup> cm<sup>-2</sup> (5.556 -11.11 mM), respectively.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113947"},"PeriodicalIF":5.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798284","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 : 2026-04-01Epub Date: 2025-12-02DOI: 10.1016/j.materresbull.2025.113933
Faiza Mokhtari, Laura Wollesen, Abdeldjelil Nehari, Kheirreddine Lebbou
This study integrates experimental and numerical approaches to reveal the mechanisms controlling bubble transport, distribution, and entrapment in sapphire single crystals grown by the micro-pulling-down (µ-PD) technique. Sapphire rods (diameter: 3 mm) were grown from a molybdenum crucible under argon atmosphere using pulling rates of 0.25–2.5 mm/min. A global finite element model, incorporating precise furnace geometry, crucible, and after heater, was developed and validated experimentally with excellent agreement. A systematic analysis of pulling rate, meniscus height (hm), and crystal-to-die diameter ratio (Drod/Ddie) demonstrates that bubble incorporation is governed by meniscus geometry and melt convection rather than pulling rate alone. When the rod diameter matches exactly the die (Drod=Ddie), the meniscus is nearly cylindrical with low height and curvature, decreasing the Marangoni convections at the periphery and the forced convection in the core. This configuration yields at low pulling rates (e.g., 0.25 mm/min), bubble-free crystals. Conversely, Drod<Ddie produces a taller and curved meniscus, that are ultimately increasing the bubble encapsulation. Peripheral bubbles are driven by Marangoni convection while core bubbles arise from downward flows (forced convection) scaling linearly with pulling rate. These insights establish that obtaining bubble-free crystals requires Drod≈Ddie and lowered pulling rates to reduce meniscus height hm and thereby convective intensity.
{"title":"Experimental and Numerical Analysis on Bubble Behavior in sapphire Rods grown by Micro-Pulling-Down","authors":"Faiza Mokhtari, Laura Wollesen, Abdeldjelil Nehari, Kheirreddine Lebbou","doi":"10.1016/j.materresbull.2025.113933","DOIUrl":"10.1016/j.materresbull.2025.113933","url":null,"abstract":"<div><div>This study integrates experimental and numerical approaches to reveal the mechanisms controlling bubble transport, distribution, and entrapment in sapphire single crystals grown by the micro-pulling-down (µ-PD) technique. Sapphire rods (diameter: 3 mm) were grown from a molybdenum crucible under argon atmosphere using pulling rates of 0.25–2.5 mm/min. A global finite element model, incorporating precise furnace geometry, crucible, and after heater, was developed and validated experimentally with excellent agreement. A systematic analysis of pulling rate, meniscus height (h<sub>m</sub>), and crystal-to-die diameter ratio (D<sub>rod</sub>/D<sub>die</sub>) demonstrates that bubble incorporation is governed by meniscus geometry and melt convection rather than pulling rate alone. When the rod diameter matches exactly the die (D<sub>rod</sub>=D<sub>die</sub>), the meniscus is nearly cylindrical with low height and curvature, decreasing the Marangoni convections at the periphery and the forced convection in the core. This configuration yields at low pulling rates (e.g., 0.25 mm/min), bubble-free crystals. Conversely, D<sub>rod</sub><D<sub>die</sub> produces a taller and curved meniscus, that are ultimately increasing the bubble encapsulation. Peripheral bubbles are driven by Marangoni convection while core bubbles arise from downward flows (forced convection) scaling linearly with pulling rate. These insights establish that obtaining bubble-free crystals requires D<sub>rod</sub>≈D<sub>die</sub> and lowered pulling rates to reduce meniscus height h<sub>m</sub> and thereby convective intensity.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113933"},"PeriodicalIF":5.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749720","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}
The ternary metal borocarbide Al3BC3 forms plate-shaped particles having a crystallographic orientation along the c-axis and is expected to have low resistance to shear strain, similar to layered ternary carbides. This work demonstrates the first-ever synthesis of a textured polycrystalline Al3BC3 sample with anisotropic mechanical properties. The sintering characteristics of monophasic Al3BC3 were evaluated and a dense specimen with some degree of c-axis orientation was produced via spark plasma sintering. Nanoscale hardness and modulus maps of an Al3BC3 grain were generated using a nanoindenter and the hardness along the c-axis was shown to be approximately twice that in the basal plane direction. The elastic modulus along the c-axis was also approximately 1.25 times that along the basal plane, in good agreement with predicted anisotropic Young's moduli. Microstructural observations showed that fracture surfaces had laminated structures similar to those of layered ternary carbides, indicating potential applications as damage-tolerant materials.
{"title":"Effects of crystal orientation on sintering and physical properties of Al3BC3","authors":"Ryosuke Maki , Shunta Matsumura , Yuta Yamawaki , Eri Takahashi , Satofumi Maruyama , Tomoyuki Maeda , Hatsuo Taira , Yoshihiro Kusano","doi":"10.1016/j.materresbull.2025.113833","DOIUrl":"10.1016/j.materresbull.2025.113833","url":null,"abstract":"<div><div>The ternary metal borocarbide Al<sub>3</sub>BC<sub>3</sub> forms plate-shaped particles having a crystallographic orientation along the <em>c</em>-axis and is expected to have low resistance to shear strain, similar to layered ternary carbides. This work demonstrates the first-ever synthesis of a textured polycrystalline Al<sub>3</sub>BC<sub>3</sub> sample with anisotropic mechanical properties. The sintering characteristics of monophasic Al<sub>3</sub>BC<sub>3</sub> were evaluated and a dense specimen with some degree of <em>c</em>-axis orientation was produced via spark plasma sintering. Nanoscale hardness and modulus maps of an Al<sub>3</sub>BC<sub>3</sub> grain were generated using a nanoindenter and the hardness along the <em>c</em>-axis was shown to be approximately twice that in the basal plane direction. The elastic modulus along the <em>c</em>-axis was also approximately 1.25 times that along the basal plane, in good agreement with predicted anisotropic Young's moduli. Microstructural observations showed that fracture surfaces had laminated structures similar to those of layered ternary carbides, indicating potential applications as damage-tolerant materials.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"195 ","pages":"Article 113833"},"PeriodicalIF":5.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322246","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}
This study presents the dual photoluminescence (PL) and thermoluminescence (TL) behaviour of Eu3+:Dy3+ co-doped ZnAl2O4 phosphors synthesized via a microwave combustion method. XRD with Rietveld refinement and HRTEM confirmed the crystalline spinel phase, while EDAX verified dopant incorporation. The co-doping enhanced luminescence, yielding efficient white light emission with CIE coordinates (x = 0.36, y = 0.30), high CRI, suitable CCT, and a quantum efficiency of 64%. PL analysis indicated dipole–dipole mediated energy transfer from Dy3+ to Eu3+ with ∼44% efficiency. TL measurements displayed a broad glow peak near 418 K across various γ-irradiation doses, with kinetic analysis providing activation energy and trapping parameters. The TL response showed a linear dose–intensity relationship, confirming the phosphor’s potential for γ-radiation dosimetry. The combined white light generation capability and dosimetric performance highlight ZnAl2O4:Eu3+,Dy3+ as a promising multifunctional material for solid-state lighting and radiation dosimetry applications.
本文研究了微波燃烧法制备的Eu3+:Dy3+共掺杂ZnAl2O4荧光粉的双光致发光（PL）和热致发光（TL）行为。Rietveld细化XRD和HRTEM证实了结晶尖晶石相，EDAX证实了掺杂物的存在。共掺杂增强了发光，产生了具有CIE坐标（x = 0.36, y = 0.30）的高效白光发射，高显色指数，合适的CCT和64%的量子效率。PL分析表明，偶极子-偶极子介导的能量从Dy3+转移到Eu3+的效率为~ 44%。在各种γ辐照剂量下，TL测量显示在418 K附近有一个宽发光峰，动力学分析提供了活化能和捕获参数。TL响应呈线性剂量-强度关系，证实了该荧光粉用于γ辐射剂量测定的潜力。ZnAl2O4:Eu3+，Dy3+的综合白光产生能力和剂量学性能突出了它作为固态照明和辐射剂量学应用的一种有前途的多功能材料。
{"title":"Engineering white light and thermoluminescence dosimetric response in Eu³⁺ and Dy³⁺ co-doped ZnAl2O4 nanophosphors","authors":"Vikas , Vikas Lahariya , Aditya Yadav , Govind Gupta","doi":"10.1016/j.materresbull.2025.113839","DOIUrl":"10.1016/j.materresbull.2025.113839","url":null,"abstract":"<div><div>This study presents the dual photoluminescence (PL) and thermoluminescence (TL) behaviour of Eu<sup>3+</sup>:Dy<sup>3+</sup> co-doped ZnAl<sub>2</sub>O<sub>4</sub> phosphors synthesized via a microwave combustion method. XRD with Rietveld refinement and HRTEM confirmed the crystalline spinel phase, while EDAX verified dopant incorporation. The co-doping enhanced luminescence, yielding efficient white light emission with CIE coordinates (x = 0.36, y = 0.30), high CRI, suitable CCT, and a quantum efficiency of 64%. PL analysis indicated dipole–dipole mediated energy transfer from Dy<sup>3+</sup> to Eu<sup>3+</sup> with ∼44% efficiency. TL measurements displayed a broad glow peak near 418 K across various γ-irradiation doses, with kinetic analysis providing activation energy and trapping parameters. The TL response showed a linear dose–intensity relationship, confirming the phosphor’s potential for γ-radiation dosimetry. The combined white light generation capability and dosimetric performance highlight ZnAl<sub>2</sub>O<sub>4</sub>:Eu<sup>3+</sup>,Dy<sup>3+</sup> as a promising multifunctional material for solid-state lighting and radiation dosimetry applications.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"195 ","pages":"Article 113839"},"PeriodicalIF":5.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145417729","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 : 2026-03-01Epub Date: 2025-10-10DOI: 10.1016/j.materresbull.2025.113834
Wilarachchige D.C.B. Gunatilleke , Thomas Doert , George S. Nolas
An understanding of the thermal properties of materials is integral to any fundamental investigation and is of interest for technologically significant applications. Furthermore, an understanding of low thermal conductivity materials continues to be of fundamental importance. In this work, phase-pure dense polycrystalline Cs2AgBiBr6 was prepared following extensive investigations into preventing the formation of impurity phases upon densification. This allowed for an investigation of the low temperature thermal properties of Cs2AgBiBr6, which revealed a low Debye temperature of 80 K and an Einstein temperature of 21 K, associated with low-frequency soft modes, that result in low thermal conductivity. This work enhances the ongoing research on inorganic perovskites and elucidates the low temperature thermal properties that will aid investigations of this and similar perovskites.
{"title":"Low temperature thermal properties of Cs2AgBiBr6","authors":"Wilarachchige D.C.B. Gunatilleke , Thomas Doert , George S. Nolas","doi":"10.1016/j.materresbull.2025.113834","DOIUrl":"10.1016/j.materresbull.2025.113834","url":null,"abstract":"<div><div>An understanding of the thermal properties of materials is integral to any fundamental investigation and is of interest for technologically significant applications. Furthermore, an understanding of low thermal conductivity materials continues to be of fundamental importance. In this work, phase-pure dense polycrystalline Cs<sub>2</sub>AgBiBr<sub>6</sub> was prepared following extensive investigations into preventing the formation of impurity phases upon densification. This allowed for an investigation of the low temperature thermal properties of Cs<sub>2</sub>AgBiBr<sub>6</sub>, which revealed a low Debye temperature of 80 K and an Einstein temperature of 21 K, associated with low-frequency soft modes, that result in low thermal conductivity. This work enhances the ongoing research on inorganic perovskites and elucidates the low temperature thermal properties that will aid investigations of this and similar perovskites.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"195 ","pages":"Article 113834"},"PeriodicalIF":5.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322247","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 : 2026-03-01Epub Date: 2025-10-07DOI: 10.1016/j.materresbull.2025.113830
Khalil Akhtar , Faisal K. Algethami , Jameel Ahmed Baig , Imam Bakhsh Solangi , Hassan Imran Afridi , Latif Ullah Khan , Yasmeen G. Abou El-Reash , Sajjad Hussain
In the current work, cobalt-doped nickel ferrite (Co0.5-Ni0.5Fe2O4) was synthesized and applied for photolytic catalytic degradation of industrial dyes including, rhodamine 6G (Rh-G) and crystal violet (CV) by sunlight irradiation. The morphological and structural characterizations of Co0.5-Ni0.5Fe2O4 confirmed rough and porous morphology, and cubic spinel crystalline structure with the point of zero charge at 6.56 pH. Different experimental parameters including effect of light, pH, contact time, catalyst dose, and initial concentration of dye were optimized to obtain maximum efficiency of catalyst. The Co0.5-Ni0.5Fe2O4 showed excellent efficiency for photocatalytic degradation of Rh-G and CV with percentage removal of 96.9, and 94.5 % in 60 min for CV and Rh-G degradation, respectively. The reusability of synthesized was also evaluated and showed < than 6% efficiency up to ten cycles. This work offers a cost-effective and eco-friendly solution for industrial wastewater treatment by Co0.5-Ni0.5Fe2O4 to achieve efficient degradation of dyes with excellent reusability.
{"title":"Synthesis of cobalt-doped nickel ferrite as a reusable photocatalyst for efficient degradation of industrial dyes","authors":"Khalil Akhtar , Faisal K. Algethami , Jameel Ahmed Baig , Imam Bakhsh Solangi , Hassan Imran Afridi , Latif Ullah Khan , Yasmeen G. Abou El-Reash , Sajjad Hussain","doi":"10.1016/j.materresbull.2025.113830","DOIUrl":"10.1016/j.materresbull.2025.113830","url":null,"abstract":"<div><div>In the current work, cobalt-doped nickel ferrite (Co<sub>0.5</sub>-Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub>) was synthesized and applied for photolytic catalytic degradation of industrial dyes including, rhodamine 6G (Rh-G) and crystal violet (CV) by sunlight irradiation. The morphological and structural characterizations of Co<sub>0.5</sub>-Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> confirmed rough and porous morphology, and cubic spinel crystalline structure with the point of zero charge at 6.56 pH. Different experimental parameters including effect of light, pH, contact time, catalyst dose, and initial concentration of dye were optimized to obtain maximum efficiency of catalyst. The Co<sub>0.5</sub>-Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> showed excellent efficiency for photocatalytic degradation of Rh-G and CV with percentage removal of 96.9, and 94.5 % in 60 min for CV and Rh-G degradation, respectively. The reusability of synthesized was also evaluated and showed < than 6% efficiency up to ten cycles. This work offers a cost-effective and eco-friendly solution for industrial wastewater treatment by Co<sub>0.5</sub>-Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> to achieve efficient degradation of dyes with excellent reusability.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"195 ","pages":"Article 113830"},"PeriodicalIF":5.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322248","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}
The Phosphor Ba1-xMoO4:xEu3+ (0.00 ≤ x < 0.09) prepared by low-cost solution combustion method were in a space group of I41/a and crystalized in tetragonal phase. The intensity of photoluminescence was found to be maximum for the transition 5D0→7F2 (615 nm) at an excitation wavelength of 394 nm with CIE color coordinates (0.6525, 0.3471) making it a potentially useful substance for red phosphor materials. Electrochemical impedance spectroscopy (EIS) research has demonstrated that the decreased charge transfer resistance of Ba1-xMoO4:xEu3+ (0.00 ≤ x < 0.09) is responsible for their improved behaviour. When lithium was used as an analyte, Ba1-xMoO4:xEu3+ (0.00 ≤ x < 0.09) demonstrated improved sensitivity in cyclic voltammetry studies at various scan rates. Further, the use of Ba1-xMoO4:xEu3+ (x = 0.07) powder as a dusting agent in fingerprint applications suggest that nanophosphor-based techniques offer a promising advancement for non-destructive and high-resolution fingerprint imaging across diverse surfaces.
{"title":"Development of multifunctional red-emitting Eu3+ activated BaMoO4 nanophosphors for dual-mode applications in electrochemical sensing and latent fingerprint visualization","authors":"H.S. Yogananda , S.R. Yashodha , Akshay Arjun , R.B. Basavaraj , N.P. Bhagya , G.K. Prashanth , H.S. Lalithamba , C.R. Ravikumar , P.K. Sharanya","doi":"10.1016/j.materresbull.2025.113831","DOIUrl":"10.1016/j.materresbull.2025.113831","url":null,"abstract":"<div><div>The Phosphor Ba<em><sub>1-x</sub></em>MoO<sub>4</sub>:<em>x</em>Eu<sup>3+</sup> (0.00 ≤ <em>x</em> < 0.09) prepared by low-cost solution combustion method were in a space group of I4<sub>1</sub>/a and crystalized in tetragonal phase. The intensity of photoluminescence was found to be maximum for the transition <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub> (615 nm) at an excitation wavelength of 394 nm with CIE color coordinates (0.6525, 0.3471) making it a potentially useful substance for red phosphor materials. Electrochemical impedance spectroscopy (EIS) research has demonstrated that the decreased charge transfer resistance of Ba<em><sub>1-x</sub></em>MoO<sub>4</sub>:<em>x</em>Eu<sup>3+</sup> (0.00 ≤ <em>x</em> < 0.09) is responsible for their improved behaviour. When lithium was used as an analyte, Ba<em><sub>1-x</sub></em>MoO<sub>4</sub>:<em>x</em>Eu<sup>3+</sup> (0.00 ≤ <em>x</em> < 0.09) demonstrated improved sensitivity in cyclic voltammetry studies at various scan rates. Further, the use of Ba<em><sub>1-x</sub></em>MoO<sub>4</sub>:<em>x</em>Eu<sup>3+</sup> (<em>x</em> = 0.07) powder as a dusting agent in fingerprint applications suggest that nanophosphor-based techniques offer a promising advancement for non-destructive and high-resolution fingerprint imaging across diverse surfaces.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"195 ","pages":"Article 113831"},"PeriodicalIF":5.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322286","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 : 2026-03-01Epub Date: 2025-11-13DOI: 10.1016/j.materresbull.2025.113892
Dandan Wang , Jing Li , Yuan Xu , Changyu Lu , Huan Ma , Jifeng Guo , Liping Wang
Bismuth halide materials are promising semiconductors due to unique layered and band structures. However, the monolithic nature of bismuth halide-based materials limits their applications because of rapid photogenerated carrier recombination and low reuse rates. To address this, the S-scheme BiOBr/BiVO4 was fabricated via straightforward two-step synthesis. SEM and TEM analyses confirmed intimate interfacial contact between BiOBr and BiVO4, and BET measurements indicated the preservation of well-defined mesoporous structure in the composite. 3:1-BiOBr/BiVO4(3-BBV) displayed enhanced visible-light absorption and improved charge separation efficiency, supported by electrochemical impedance spectroscopy (EIS) showing notable decrease in charge transfer resistance. During photocatalytic tetracycline (TC) degradation, the 3-BBV sample exhibited first-order rate constants 2.61 and 3.70 times greater than those of pristine BiOBr and BiVO4, respectively. Furthermore, the composite demonstrated remarkable recyclability, maintaining 71.48 % of its initial degradation efficiency over multiple cycles. Free radical trapping experiments revealed that h⁺ and·O2- serve as the dominant reactive species. Together with DFT simulations, these results confirm that the performance enhancement originates from S-scheme charge transfer mechanism driven by internal electric field, which efficiently separates and utilizes photogenerated carriers. This study offers a practical approach for developing efficient and durable S-scheme photocatalysts for the treatment of antibiotic-contaminated wastewater.
{"title":"Visible light-driven photocatalytic degradation of BiOBr/BiVO4 S-scheme: Performances, DFT calculations and mechanism","authors":"Dandan Wang , Jing Li , Yuan Xu , Changyu Lu , Huan Ma , Jifeng Guo , Liping Wang","doi":"10.1016/j.materresbull.2025.113892","DOIUrl":"10.1016/j.materresbull.2025.113892","url":null,"abstract":"<div><div>Bismuth halide materials are promising semiconductors due to unique layered and band structures. However, the monolithic nature of bismuth halide-based materials limits their applications because of rapid photogenerated carrier recombination and low reuse rates. To address this, the S-scheme BiOBr/BiVO<sub>4</sub> was fabricated via straightforward two-step synthesis. SEM and TEM analyses confirmed intimate interfacial contact between BiOBr and BiVO<sub>4</sub>, and BET measurements indicated the preservation of well-defined mesoporous structure in the composite. 3:1-BiOBr/BiVO<sub>4</sub>(3-BBV) displayed enhanced visible-light absorption and improved charge separation efficiency, supported by electrochemical impedance spectroscopy (EIS) showing notable decrease in charge transfer resistance. During photocatalytic tetracycline (TC) degradation, the 3-BBV sample exhibited first-order rate constants 2.61 and 3.70 times greater than those of pristine BiOBr and BiVO<sub>4</sub>, respectively. Furthermore, the composite demonstrated remarkable recyclability, maintaining 71.48 % of its initial degradation efficiency over multiple cycles. Free radical trapping experiments revealed that h⁺ and·O<sub>2</sub><sup>-</sup> serve as the dominant reactive species. Together with DFT simulations, these results confirm that the performance enhancement originates from S-scheme charge transfer mechanism driven by internal electric field, which efficiently separates and utilizes photogenerated carriers. This study offers a practical approach for developing efficient and durable S-scheme photocatalysts for the treatment of antibiotic-contaminated wastewater.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"196 ","pages":"Article 113892"},"PeriodicalIF":5.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145532380","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 : 2026-03-01Epub Date: 2025-11-22DOI: 10.1016/j.materresbull.2025.113901
Muhammad Rahim , Fayyaz Hussain , Muhammad Khalid , Muhammad Younas , Imed Boukhris , M S Al-Buriahi , M.G.B. Ashiq
In this paper, the sol-gel auto combustion, an environmentally friendly and economically cheap technique, was utilized for the synthesis of La3+ doped Mg-Zn aluminates with compositional formula of Zn0.5Mg0.5La2-xAl2-xO4 and concentration from x = 0.00 to 0.10 with step size of 0.02. Synthesized samples were further annealed for 3 h at 800 °C. X-Ray diffractometry (XRD) was applied that confirmed the spinel structure of La3+ doped Mg-Zn Aluminate nanoparticles. XRD analysis shows that the crystal size was found from 6.35 nm to 7.54 nm with average of 6.95 nm. The increasing trend in lattice constant and crystalline size was observed by an increase in the doping concentrations of La3+. TEM was utilized to study morphology and confirm the structural parameters of the samples. EDX was used to confirm the present elements and their weights % in the sample. Furrier transformed infrared spectroscopy) FTIR) in the range of 400 to 1000 cm-1 was used to study the absorption bands for octahedral sites and tetrahedral sites. Energy bands for both sites were observed to confirm the spinel structure. Using impedance analyzers at room temperature in the range of 1 MHz to 3 GHz was utilized to study impedance, dielectric constant, dielectric loss, electric modulus, tangent loss and AC conductivity of the samples. In the intermediate region of frequencies, the dielectric constant and loss ware found constant and stable. The variation in dielectric constant, dielectric loss, and impedance, due to change in doping concentration, polarization phenomena and conductivity mechanisms have been studied and discussed. AC conductivity with applied frequencies was also studied. A very low dielectric loss and a peak in dielectric constant was found at high frequencies in MHz range, it means that La3+ doped Mg-Zn aluminates nanoparticles can be used as dielectric materials in the high frequency energy devices.
{"title":"La3+ ion doped Mg-Zn aluminates spinel nanoparticles: A gateway to high-frequency dielectric applications","authors":"Muhammad Rahim , Fayyaz Hussain , Muhammad Khalid , Muhammad Younas , Imed Boukhris , M S Al-Buriahi , M.G.B. Ashiq","doi":"10.1016/j.materresbull.2025.113901","DOIUrl":"10.1016/j.materresbull.2025.113901","url":null,"abstract":"<div><div>In this paper, the sol-gel auto combustion, an environmentally friendly and economically cheap technique, was utilized for the synthesis of La<sup>3+</sup> doped Mg-Zn aluminates with compositional formula of Zn<sub>0.5</sub>Mg<sub>0.5</sub>La<sub>2-x</sub>Al<sub>2-x</sub>O<sub>4</sub> and concentration from x = 0.00 to 0.10 with step size of 0.02. Synthesized samples were further annealed for 3 h at 800 °C. X-Ray diffractometry (XRD) was applied that confirmed the spinel structure of La<sup>3+</sup> doped Mg-Zn Aluminate nanoparticles. XRD analysis shows that the crystal size was found from 6.35 nm to 7.54 nm with average of 6.95 nm. The increasing trend in lattice constant and crystalline size was observed by an increase in the doping concentrations of La<sup>3+</sup>. <strong>TEM was utilized to study morphology and confirm the structural parameters of the samples. EDX was used to confirm the present elements and their weights % in the sample.</strong> Furrier transformed infrared spectroscopy) FTIR) in the range of 400 to 1000 cm<sup>-1</sup> was used to study the absorption bands for octahedral sites and tetrahedral sites. Energy bands for both sites were observed to confirm the spinel structure. Using impedance analyzers at room temperature in the range of 1 MHz to 3 GHz was utilized to study impedance, dielectric constant, dielectric loss, electric modulus, tangent loss and AC conductivity of the samples. In the intermediate region of frequencies, the dielectric constant and loss ware found constant and stable. The variation in dielectric constant, dielectric loss, and impedance, due to change in doping concentration, polarization phenomena and conductivity mechanisms have been studied and discussed. AC conductivity with applied frequencies was also studied. A very low dielectric loss and a peak in dielectric constant was found at high frequencies in MHz range, it means that La<sup>3+</sup> doped Mg-Zn aluminates nanoparticles can be used as dielectric materials in the high frequency energy devices.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"196 ","pages":"Article 113901"},"PeriodicalIF":5.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145622108","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}
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