Pub Date : 2025-01-01DOI: 10.1016/j.materresbull.2024.113292
Vikram Maurya, Sarthak Singhal
This work presents an ultrathin terahertz linear cross polarization converter (LCPC) with a unit cell volume of 0.125λL × 0.125λL × 0.67λL (λL= wavelength at 3.1285 THz). The unit cell consists of a metallic resonator composed of two l-shaped structures, a center cross-shaped structure, a dielectric material, and a metallic ground plane. The suggested LCPC has a Polarization Converter Ratio (PCR)≥80 % from 3.1285 THz to 9.6 THz with an FWHM of 6.776 THz. This polarization converter transforms x-polarized to y-polarized waves and vice versa. The PCR≥80 % bandwidth and PCR≥90 % peaks are almost unaffected for incident angle(θ)≤20° and θ≤45°, respectively, at 3.34, 5.15, 7.92, and 9.42 THz. The LCPC's equivalent circuit model (ECM) results agree with the simulated results. This LCPC-based biosensor detects blood cancer, basal skin cell cancer, and TB with a maximum sensitivity of ∼0.9302 THz/RIU, ∼0.9441 THz/RIU, and ∼0.9554 THz/RIU respectively.
{"title":"Ultrathin reflecting wideband terahertz cross polarization converter as a biosensor","authors":"Vikram Maurya, Sarthak Singhal","doi":"10.1016/j.materresbull.2024.113292","DOIUrl":"10.1016/j.materresbull.2024.113292","url":null,"abstract":"<div><div>This work presents an ultrathin terahertz linear cross polarization converter (LCPC) with a unit cell volume of 0.125λ<sub>L</sub> × 0.125λ<sub>L</sub> × 0.67λ<sub>L</sub> (λ<sub>L</sub>= wavelength at 3.1285 THz). The unit cell consists of a metallic resonator composed of two <span>l</span>-shaped structures, a center cross-shaped structure, a dielectric material, and a metallic ground plane. The suggested LCPC has a Polarization Converter Ratio (PCR)≥80 % from 3.1285 THz to 9.6 THz with an FWHM of 6.776 THz. This polarization converter transforms x-polarized to y-polarized waves and vice versa. The PCR≥80 % bandwidth and PCR≥90 % peaks are almost unaffected for incident angle(θ)≤20° and θ≤45°, respectively, at 3.34, 5.15, 7.92, and 9.42 THz. The LCPC's equivalent circuit model (ECM) results agree with the simulated results. This LCPC-based biosensor detects blood cancer, basal skin cell cancer, and TB with a maximum sensitivity of ∼0.9302 THz/RIU, ∼0.9441 THz/RIU, and ∼0.9554 THz/RIU respectively.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"185 ","pages":"Article 113292"},"PeriodicalIF":5.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103932","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}
New rare earth-doped glasses with wide transparency and tunable optical properties show promise for various technological applications. While the effects of alkaline earth metals on glass compositions have been widely studied, their role in niobium-phosphate glasses remains unexplored. This study investigates Eu3+-doped niobium-lead pyrophosphate glasses modified with different alkaline earth metals, prepared via melt-quenching. Thermal, structural, optical, and spectroscopic properties were examined. Differential scanning calorimetry (DSC) showed that the thermal stability against crystallization decreased from Mg2+ to Ba2+, with Sr2+ exhibiting the lowest stability. Raman and solid-state NMR spectroscopy revealed minimal changes in the niobium-phosphate network but shifts in the Q0/Q1 phosphate unit ratio were detected. Spectroscopic analysis showed that larger alkaline earth ions increase symmetry around Eu3+ and increase the 5D0 lifetime. Sr2+-containing samples showed exceptional results, suggesting a possible substitution between Sr2+ and Pb2+ due to their similar ionic radii.
{"title":"Fluorine alkaline earth (MgF2, CaF2, SrF2, BaF2) influence on thermal, structural, and luminescent properties of Eu3+-doped niobium phospho-fluoride glass","authors":"Leandro Olivetti Estevam da Silva , V.A.G. Rivera , Rodrigo Falci , Younès Messaddeq , Marcos de Oliveira Junior , Danilo Manzani","doi":"10.1016/j.materresbull.2024.113291","DOIUrl":"10.1016/j.materresbull.2024.113291","url":null,"abstract":"<div><div>New rare earth-doped glasses with wide transparency and tunable optical properties show promise for various technological applications. While the effects of alkaline earth metals on glass compositions have been widely studied, their role in niobium-phosphate glasses remains unexplored. This study investigates Eu<sup>3+</sup>-doped niobium-lead pyrophosphate glasses modified with different alkaline earth metals, prepared via melt-quenching. Thermal, structural, optical, and spectroscopic properties were examined. Differential scanning calorimetry (DSC) showed that the thermal stability against crystallization decreased from Mg<sup>2+</sup> to Ba<sup>2+</sup>, with Sr<sup>2+</sup> exhibiting the lowest stability. Raman and solid-state NMR spectroscopy revealed minimal changes in the niobium-phosphate network but shifts in the Q<sup>0</sup>/Q<sup>1</sup> phosphate unit ratio were detected. Spectroscopic analysis showed that larger alkaline earth ions increase symmetry around Eu<sup>3+</sup> and increase the <sup>5</sup>D<sub>0</sub> lifetime. Sr<sup>2+</sup>-containing samples showed exceptional results, suggesting a possible substitution between Sr<sup>2+</sup> and Pb<sup>2+</sup> due to their similar ionic radii.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"185 ","pages":"Article 113291"},"PeriodicalIF":5.3,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171535","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}
An advanced hybrid Polyaniline-VO (PSVO) nanocomposite with a unique structure was successfully synthesized via chemical in-situ oxidation polymerization. Small particles are distributed throughout the nanofibers framework, improving the charge transfer characteristics of PSVO, as shown by field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The PSVO nanocomposite demonstrated exceptional photocatalytic efficacy under sunlight, effectively degrading a range of organic dyes: methylene blue (MB), methyl orange (MO), malachite green (MG), and rhodamine B (RhB) in different water sources, including river, tap, and stagnant water, with degradation efficiencies of 92.51%, 95.18%, 90.61%, and 97.42%, respectively. The integration of VO significantly enhanced redox activity and charge storage, elevating the material’s electrochemical performance. The optimized PSVO sample with 10% VO content achieved an impressive specific capacitance of 1027.87 F g−1 at a current density of 1 A g−1 with energy density of 91.33 Wh/kg and power density of 400 W/kg. These attributes make the PSVO nanocomposite an outstanding candidate for applications in high-performance supercapacitors and efficient water purification.
{"title":"Polyaniline-V2O5 nanocomposite for photocatalytic efficacy in organic dye degradation and as electrode materials for supercapacitor applications","authors":"Debashish Nayak , Tusharkanta Nayak , Smita Mohanty , Akshaya K. Palai , Ram Bilash Choudhary , Rohit Kandulna","doi":"10.1016/j.materresbull.2024.113277","DOIUrl":"10.1016/j.materresbull.2024.113277","url":null,"abstract":"<div><div>An advanced hybrid Polyaniline-V<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math></span> (PSVO) nanocomposite with a unique structure was successfully synthesized via chemical in-situ oxidation polymerization. Small particles are distributed throughout the nanofibers framework, improving the charge transfer characteristics of PSVO, as shown by field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The PSVO nanocomposite demonstrated exceptional photocatalytic efficacy under sunlight, effectively degrading a range of organic dyes: methylene blue (MB), methyl orange (MO), malachite green (MG), and rhodamine B (RhB) in different water sources, including river, tap, and stagnant water, with degradation efficiencies of 92.51%, 95.18%, 90.61%, and 97.42%, respectively. The integration of V<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math></span> significantly enhanced redox activity and charge storage, elevating the material’s electrochemical performance. The optimized PSVO sample with 10% V<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math></span> content achieved an impressive specific capacitance of 1027.87 F g<sup>−1</sup> at a current density of 1 A g<sup>−1</sup> with energy density of 91.33 Wh/kg and power density of 400 W/kg. These attributes make the PSVO nanocomposite an outstanding candidate for applications in high-performance supercapacitors and efficient water purification.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113277"},"PeriodicalIF":5.3,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159242","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 : 2024-12-30DOI: 10.1016/j.materresbull.2024.113288
Junli Chen , Tao Wang , Ziqi Yang , Pan Gao
Reasonable design of highly efficient photocatalysts for CO2 conversion is of utmost urgency for the energy crisis. Enhancing the light absorption of photocatalysts and improving the photo-generated electrons and holes (e−-h+) transfer are the most promising strategies for the high-efficiency photocatalytic CO2 reaction. In this work, petal-liked Cu-modified Nb2O5 photocatalysts were synthesized successfully through simple solvothermal and reduction treatments. Uniform-dispersed Cu NPs can not only act as electron trappers to enhance e−-h+ separation, but also as high-efficiency co-catalysts to improve the photocatalytic CO2 reduction ability of pristine Nb2O5 materials. Experimental results showed that the optimized Nb2O5-0.5%Cu exhibited high yields for CH4 (14.63 μmol·g−1·h−1) and CO (2.84 μmol·g−1·h−1) with excellent CH4 selectivity (83.75%) under irradiation. This work provides new insights into the construction of efficient photocatalysts for CO2 reduction in the future.
{"title":"Cu-modified Nb2O5 photocatalysts for high performance of CO2 reduction","authors":"Junli Chen , Tao Wang , Ziqi Yang , Pan Gao","doi":"10.1016/j.materresbull.2024.113288","DOIUrl":"10.1016/j.materresbull.2024.113288","url":null,"abstract":"<div><div>Reasonable design of highly efficient photocatalysts for CO<sub>2</sub> conversion is of utmost urgency for the energy crisis. Enhancing the light absorption of photocatalysts and improving the photo-generated electrons and holes (e<sup>−</sup>-h<sup>+</sup>) transfer are the most promising strategies for the high-efficiency photocatalytic CO<sub>2</sub> reaction. In this work, petal-liked Cu-modified Nb<sub>2</sub>O<sub>5</sub> photocatalysts were synthesized successfully through simple solvothermal and reduction treatments. Uniform-dispersed Cu NPs can not only act as electron trappers to enhance e<sup>−</sup>-h<sup>+</sup> separation, but also as high-efficiency co-catalysts to improve the photocatalytic CO<sub>2</sub> reduction ability of pristine Nb<sub>2</sub>O<sub>5</sub> materials. Experimental results showed that the optimized Nb<sub>2</sub>O<sub>5</sub>-0.5%Cu exhibited high yields for CH<sub>4</sub> (14.63 μmol·g<sup>−1</sup>·h<sup>−1</sup>) and CO (2.84 μmol·g<sup>−1</sup>·h<sup>−1</sup>) with excellent CH<sub>4</sub> selectivity (83.75%) under irradiation. This work provides new insights into the construction of efficient photocatalysts for CO<sub>2</sub> reduction in the future.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113288"},"PeriodicalIF":5.3,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159243","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 : 2024-12-30DOI: 10.1016/j.materresbull.2024.113289
Tribidasari A. Ivandini , Fathiya F. Ulfah , Dinda P.N. Nahda , Sadewo P. Luhur , Afiten R. Sanjaya , Yuni K. Krisnandi , Afriyanti Sumboja , Anne Zulfia , Kwang-Sun Ryu , Zico A. Akbar
Nickel foam (NF) surface was successfully modified to produce a hierarchical structure MnO2-modified NiCo-layered double hydroxide (MnO2/NiCo-LDH) for a high-performance supercapacitor. A two-step hydrothermal method was applied, including the synthesis of hierarchical one-dimension NiCo-carbonate onto NF, followed by the synthesis of MnO2. The characterization results showed the growth of nanoneedle-like NiCo-carbonate particles perpendicular on the NF surface covered with δ-MnO2. MnO2 attachment disrupted the nanoneedles structure forming the hierarchical rod shapes and changing the structure of NiCo carbonate to NiCo-LDH. This change significantly increases the material's electroactive surface area and enhances the specific capacitance. At 1 A g−1 current density, the specific capacitance of 2572.73 F g−1 was achieved, which is substantially higher than those of NiCo/NF and MnO2/NF. Furthermore, good stability was shown by 10,000 repetitive charge-discharge cycles (at 20 A g−1) with a specific capacity retention of 78.95 % indicating that the developed material was suitable for supercapacitors.
{"title":"Hierarchical rod-like structure MnO2/NiCo-layered double hydroxide on nickel foam for a high-performance supercapacitor electrode","authors":"Tribidasari A. Ivandini , Fathiya F. Ulfah , Dinda P.N. Nahda , Sadewo P. Luhur , Afiten R. Sanjaya , Yuni K. Krisnandi , Afriyanti Sumboja , Anne Zulfia , Kwang-Sun Ryu , Zico A. Akbar","doi":"10.1016/j.materresbull.2024.113289","DOIUrl":"10.1016/j.materresbull.2024.113289","url":null,"abstract":"<div><div>Nickel foam (NF) surface was successfully modified to produce a hierarchical structure MnO<sub>2</sub>-modified NiCo-layered double hydroxide (MnO<sub>2</sub>/NiCo-LDH) for a high-performance supercapacitor. A two-step hydrothermal method was applied, including the synthesis of hierarchical one-dimension NiCo-carbonate onto NF, followed by the synthesis of MnO<sub>2</sub>. The characterization results showed the growth of nanoneedle-like NiCo-carbonate particles perpendicular on the NF surface covered with δ-MnO<sub>2</sub>. MnO<sub>2</sub> attachment disrupted the nanoneedles structure forming the hierarchical rod shapes and changing the structure of NiCo carbonate to NiCo-LDH. This change significantly increases the material's electroactive surface area and enhances the specific capacitance. At 1 A <em>g</em><sup>−1</sup> current density, the specific capacitance of 2572.73 F <em>g</em><sup>−1</sup> was achieved, which is substantially higher than those of NiCo/NF and MnO<sub>2</sub>/NF. Furthermore, good stability was shown by 10,000 repetitive charge-discharge cycles (at 20 A <em>g</em><sup>−1</sup>) with a specific capacity retention of 78.95 % indicating that the developed material was suitable for supercapacitors.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113289"},"PeriodicalIF":5.3,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159241","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 : 2024-12-29DOI: 10.1016/j.materresbull.2024.113287
Aneesha, Mohan Singh Mehata
This study explores the synthesis of MoSe2 quantum dots (QDs) via the hydrothermal method, followed by detailed characterization to determine their size and crystallinity. The MoSe2 QDs exhibit a strong absorption peak at 260 nm and excitation-dependent photoluminescence (PL). These PL properties were utilized to develop a probe/sensor for detecting 2,4,6-trinitrophenol (2,4,6-TNP), a toxic nitroaromatic compound commonly found in contaminated water. As the concentration of 2,4,6-TNP increases, the PL intensity of QDs at 410 nm decreases in a monotonic fashion, showing a linear Stern-Volmer response within the concentration range of 3.3–99 nM, with a detection limit of 1.43 nM. The reduction in PL intensity is primarily driven by the inner filter effect. This study highlights the potential of MoSe2 QDs for environmental monitoring and the detection of hazardous compounds like picric acid in water.
{"title":"Waterborne explosives: A rapid detection method using MoSe2 quantum dots","authors":"Aneesha, Mohan Singh Mehata","doi":"10.1016/j.materresbull.2024.113287","DOIUrl":"10.1016/j.materresbull.2024.113287","url":null,"abstract":"<div><div>This study explores the synthesis of MoSe<sub>2</sub> quantum dots (QDs) via the hydrothermal method, followed by detailed characterization to determine their size and crystallinity. The MoSe<sub>2</sub> QDs exhibit a strong absorption peak at 260 nm and excitation-dependent photoluminescence (PL). These PL properties were utilized to develop a probe/sensor for detecting 2,4,6-trinitrophenol (2,4,6-TNP), a toxic nitroaromatic compound commonly found in contaminated water. As the concentration of 2,4,6-TNP increases, the PL intensity of QDs at 410 nm decreases in a monotonic fashion, showing a linear Stern-Volmer response within the concentration range of 3.3–99 nM, with a detection limit of 1.43 nM. The reduction in PL intensity is primarily driven by the inner filter effect. This study highlights the potential of MoSe<sub>2</sub> QDs for environmental monitoring and the detection of hazardous compounds like picric acid in water.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"185 ","pages":"Article 113287"},"PeriodicalIF":5.3,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103931","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 : 2024-12-29DOI: 10.1016/j.materresbull.2024.113290
Daniel Y. Tiba, Thiago C. Canevari
This work describes the synthesis characterization and application of innovative CuONPs/GO/CDot(N) nanostructures obtained by direct reaction between graphene oxide, nitrogen-doped carbon quantum dots (CDot(N)), and copper (II) nitrate. The hybrid nanostructures were characterized by spectroscopies methods such as Raman, ultraviolet-visible (UV-Vis), and X-ray photoelectron spectroscopies (XPS), X-ray diffraction (XRD), High-resolution transmission electron microscopy (HR-TEM), and electrochemical techniques. A sensitive electrochemical sensor to determine glyphosate in the real sample has been constructed by a printed carbon electrode modified with CuONPs/GO/CDot(N) nanostructures. Determination of the pesticide glyphosate (glyph) has been performed in phosphate buffer solution (PBS) at pH 5.5 and in real water samples by differential pulse voltammetry technique (DPV). The printed carbon electrode modified with CuONPs/GO/CDot(N) nanostructures presented a detection limit of 1.97 nmol.L−1 (0.3 µg.L−1). The modified, printed carbon electrode determined glyphosate in real samples, with recovery ranging from 95.2 % to 114%. Other pesticides didn't present significant interference in the glyphosate determination.
{"title":"Graphene hybrid nanostructures based screen-printed sensor employed in the glyphosate electrocatalytic determination in the real sample","authors":"Daniel Y. Tiba, Thiago C. Canevari","doi":"10.1016/j.materresbull.2024.113290","DOIUrl":"10.1016/j.materresbull.2024.113290","url":null,"abstract":"<div><div>This work describes the synthesis characterization and application of innovative CuONPs/GO/CDot(N) nanostructures obtained by direct reaction between graphene oxide, nitrogen-doped carbon quantum dots (CDot(N)), and copper (II) nitrate. The hybrid nanostructures were characterized by spectroscopies methods such as Raman, ultraviolet-visible (UV-Vis), and X-ray photoelectron spectroscopies (XPS), X-ray diffraction (XRD), High-resolution transmission electron microscopy (HR-TEM), and electrochemical techniques. A sensitive electrochemical sensor to determine glyphosate in the real sample has been constructed by a printed carbon electrode modified with CuONPs/GO/CDot(N) nanostructures. Determination of the pesticide glyphosate (glyph) has been performed in phosphate buffer solution (PBS) at pH 5.5 and in real water samples by differential pulse voltammetry technique (DPV). The printed carbon electrode modified with CuONPs/GO/CDot(N) nanostructures presented a detection limit of 1.97 nmol.L<sup>−1</sup> (0.3 µg.L<sup>−1</sup>). The modified, printed carbon electrode determined glyphosate in real samples, with recovery ranging from 95.2 % to 114%. Other pesticides didn't present significant interference in the glyphosate determination.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"185 ","pages":"Article 113290"},"PeriodicalIF":5.3,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171536","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 : 2024-12-28DOI: 10.1016/j.materresbull.2024.113286
Rittik Parui, Subhratanu Bhattacharya
We report on high-performance gel polymer electrolytes (GPEs) with outstanding physical, electrical, electrochemical, and fire-resistant characteristics. Highly porous copolymer membranes are developed by grafting PMMA side chains onto the P(VDF-HFP) copolymer backbone, followed by blending with variable percentages of imidazolium ionic liquid (IL) functionalized SiO2 nanoparticles. Finally, the GPEs are obtained by submerging the porous membrane in an organic electrolyte solution. The GPE exhibits outstanding ion conductivity of 6.09 mS cm–1 with an appreciable lithium ion transference number (0.57) at room temperature and excellent compatibility with Li electrodes. The Li/LiFePO4 cell comprising the optimized GPE delivers a high reversible capacity of ∼132 mAh g−1 at 2C and high discharge capacities of 155.9 and 141.2 mAh g−1 after consecutive 40 and 60 cycles at C/3 and 1C rates, respectively. With its improved electrochemical performances and high level of safety, the as-developed GPE has a lot of promise for use in LMBs.
{"title":"High-performing, flame-resistant gel polymer electrolytes derived from PMMA side chain grafted P(VDF-HFP) based nanocomposite membranes for lithium-ion batteries","authors":"Rittik Parui, Subhratanu Bhattacharya","doi":"10.1016/j.materresbull.2024.113286","DOIUrl":"10.1016/j.materresbull.2024.113286","url":null,"abstract":"<div><div>We report on high-performance gel polymer electrolytes (GPEs) with outstanding physical, electrical, electrochemical, and fire-resistant characteristics. Highly porous copolymer membranes are developed by grafting PMMA side chains onto the P(VDF-HFP) copolymer backbone, followed by blending with variable percentages of imidazolium ionic liquid (IL) functionalized SiO<sub>2</sub> nanoparticles. Finally, the GPEs are obtained by submerging the porous membrane in an organic electrolyte solution. The GPE exhibits outstanding ion conductivity of 6.09 mS cm<sup>–1</sup> with an appreciable lithium ion transference number (0.57) at room temperature and excellent compatibility with Li electrodes. The Li/LiFePO<sub>4</sub> cell comprising the optimized GPE delivers a high reversible capacity of ∼132 mAh g<sup>−1</sup> at 2C and high discharge capacities of 155.9 and 141.2 mAh g<sup>−1</sup> after consecutive 40 and 60 cycles at C/3 and 1C rates, respectively. With its improved electrochemical performances and high level of safety, the as-developed GPE has a lot of promise for use in LMBs.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"185 ","pages":"Article 113286"},"PeriodicalIF":5.3,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143170442","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 : 2024-12-28DOI: 10.1016/j.materresbull.2024.113281
Avinash Kumar , Janpreet Singh , S.K. Tripathi
In this work, Seebeck coefficient (S) and Power factor (PF) of thermoelectric (TE) material β-Zn4Sb3 thin films were enhanced significantly via chemical etching strategy. β-Zn4Sb3 was synthesized using melt-quench method and thin films were deposited using thermal evaporation technique. Dip method of wet chemical etching in 0.025 M KOH solution was used to prepare thin film samples for various etching time periods. All thin film samples were annealed at 383 K and thermoelectric properties of samples were determined at room temperature (303 K). A maximum S value of 422 µVK-1 and PF value of 1091.65 µWm-1K-2 were obtained at room temperature for 8 minutes (Min) etching time which were enhanced by 62 %, 89 % respectively compared to without etched sample (As). Enhancement in S value is attributed to combination of surface scattering and energy filtering effects. Maximum electrical conductivity (σ) value of 9.20 Sm-1 was obtained for 2 Min thin film. Optical properties were studied using UV–Vis spectroscopy (UV–Vis) and Photoluminescence spectroscopy (PL). Band gap determined from UV–Vis spectra is increasing in trend with etching time due to quantum confinement effects. PL spectra depicted increase in surface defects states with etching time. Structural and morphological properties were analyzed using X-ray diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) respectively. FESEM analysis supported with XRD and PL analysis revealed increase in porosity, surface defects, pore sizes with etching time. Average film thickness of 175 nm was determined using cross sectional FESEM. Thin films surface topography and roughness with etching durations were investigated using Atomic Force Microscope (AFM).
{"title":"High thermoelectric coefficients of β-Zn4Sb3 thin films at room temperature via chemical etching","authors":"Avinash Kumar , Janpreet Singh , S.K. Tripathi","doi":"10.1016/j.materresbull.2024.113281","DOIUrl":"10.1016/j.materresbull.2024.113281","url":null,"abstract":"<div><div>In this work, Seebeck coefficient (S) and Power factor (PF) of thermoelectric (TE) material β-Zn<sub>4</sub>Sb<sub>3</sub> thin films were enhanced significantly via chemical etching strategy. β-Zn<sub>4</sub>Sb<sub>3</sub> was synthesized using melt-quench method and thin films were deposited using thermal evaporation technique. Dip method of wet chemical etching in 0.025 M KOH solution was used to prepare thin film samples for various etching time periods. All thin film samples were annealed at 383 K and thermoelectric properties of samples were determined at room temperature (303 K). A maximum S value of 422 µVK<sup>-1</sup> and PF value of 1091.65 µWm<sup>-1</sup>K<sup>-2</sup> were obtained at room temperature for 8 minutes (Min) etching time which were enhanced by 62 %, 89 % respectively compared to without etched sample (As). Enhancement in S value is attributed to combination of surface scattering and energy filtering effects. Maximum electrical conductivity (σ) value of 9.20 <span><math><mrow><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>3</mn></msup></mrow></math></span> Sm<sup>-1</sup> was obtained for 2 Min thin film. Optical properties were studied using UV–Vis spectroscopy (UV–Vis) and Photoluminescence spectroscopy (PL). Band gap determined from UV–Vis spectra is increasing in trend with etching time due to quantum confinement effects. PL spectra depicted increase in surface defects states with etching time. Structural and morphological properties were analyzed using X-ray diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) respectively. FESEM analysis supported with XRD and PL analysis revealed increase in porosity, surface defects, pore sizes with etching time. Average film thickness of 175 nm was determined using cross sectional FESEM. Thin films surface topography and roughness with etching durations were investigated using Atomic Force Microscope (AFM).</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113281"},"PeriodicalIF":5.3,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158875","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 : 2024-12-28DOI: 10.1016/j.materresbull.2024.113283
O. Sidletskiy , I. Gerasymov , D. Kurtsev , O. Viahin , S. Tkachenko , D. Kofanov , S. Sadivnycha , L. Martinazzoli , L. Roux , E. Auffray , V. Kononets , K. Lebbou
This work focuses on the development of fast-timing inorganic scintillators for use in cutting-edge particle physics experiments at colliders and time-of-flight positron emission tomography (TOF-PET). Significant progress in enhancing the timing performance of Y₃Al₅O₁₂ (YAG) scintillators is reported, achieved by optimizing the co-doping conditions with Ca²⁺ and Mg²⁺. The optimized crystals exhibit fast rise and decay times of 30 ps and 26 ns, respectively, alongside with an impressive coincidence time resolution (CTR) of 131 ps, while maintaining a high light output of over 22,000 pH/MeV. The incorporation of dopants into the YAG lattice is explored, providing insights into the mechanisms driving scintillation response in YAG:Ce,Ca,Mg crystals. Furthermore, uniformity in scintillation properties was demonstrated along a large, 120 mm-long YAG:Ce,Ca,Mg ingot, which was grown using the Czochralski method in a tungsten crucible.
{"title":"Progress in fast-timing Ce-doped garnet scintillators by complex codoping with divalent cations","authors":"O. Sidletskiy , I. Gerasymov , D. Kurtsev , O. Viahin , S. Tkachenko , D. Kofanov , S. Sadivnycha , L. Martinazzoli , L. Roux , E. Auffray , V. Kononets , K. Lebbou","doi":"10.1016/j.materresbull.2024.113283","DOIUrl":"10.1016/j.materresbull.2024.113283","url":null,"abstract":"<div><div>This work focuses on the development of fast-timing inorganic scintillators for use in cutting-edge particle physics experiments at colliders and time-of-flight positron emission tomography (TOF-PET). Significant progress in enhancing the timing performance of Y₃Al₅O₁₂ (YAG) scintillators is reported, achieved by optimizing the co-doping conditions with Ca²⁺ and Mg²⁺. The optimized crystals exhibit fast rise and decay times of 30 ps and 26 ns, respectively, alongside with an impressive coincidence time resolution (CTR) of 131 ps, while maintaining a high light output of over 22,000 pH/MeV. The incorporation of dopants into the YAG lattice is explored, providing insights into the mechanisms driving scintillation response in YAG:Ce,Ca,Mg crystals. Furthermore, uniformity in scintillation properties was demonstrated along a large, 120 mm-long YAG:Ce,Ca,Mg ingot, which was grown using the Czochralski method in a tungsten crucible.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113283"},"PeriodicalIF":5.3,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159231","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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