OPTICS EXPRESS
·
2023
·Vol. 31
·期 23
·38699-38714
·
IF 3.8
Liu Mingjin,Shuo Cheng,Xuejian Du,Jing Li,Qianqian Peng,Chenlong Zhao,Yaoyang Wang,Xianwu Xiu
Noble metal and semiconductor composite substrates possess high sensitivity, excellent stability, good biocompatibility, and selective enhancement, making them an important research direction in the field of surface-enhanced Raman scattering (SERS). Ta2O5, as a semiconductor material with high thermal stability, corrosion resistance, outstanding optical properties, and catalytic performance, has great potential in SERS research. This study aims to design and fabricate a composite SERS substrate based on Ta2O5 nanostructures, achieving optimal detection performance by combining the urchin-like structure of Ta2O5 with silver nanoparticles (Ag NPs). The urchin-like Ta2O5 nanostructures were prepared using a hydrothermal reaction method. The bandgap was modulated through structure design and the self-doping technique, the charge transfer efficiency and surface plasmon resonance effects were improved, thereby achieving better SERS performance. The composite substrate enables highly sensitive quantitative detection. This composite SERS substrate combines the electromagnetic enhancement mechanism (EM) and chemical enhancement mechanism (CM), achieving ultra-low detection limits of 10−13 M for R6G. Within the concentration range above 10−12 M, there is a good linear relationship between concentration and peak intensity, demonstrating excellent quantitative analysis capabilities. Furthermore, this composite SERS substrate is capable of precise detection of analytes such as crystal violet (CV) and methylene blue (MB), holding broad application prospects in areas such as food safety and environmental monitoring.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yong Liu,Weixuan Zeng,Yongjin Ma,Rui Dong,Pengfei Tan,Jun Pan
An oxygen-deficient amorphous Ta 2 O 5 nanoparticle photocatalyst was synthesized by a solvothermal method and thermal annealing in Ar atmosphere. The as-prepared Ta 2 O 5 photocatalysts possess improved hydrogen evolution activities compared to pristine Ta 2 O 5 and commercial Ta 2 O 5 under the irradiation of simulated solar light. Therein, Ta 2 O 5 nanoparticles annealing at 400 °C exhibit the most preferable catalytic performance of 10.67 μmol g −1 h −1 . The enhanced performance can be attributed to the existence of oxygen defects in the samples, which can facilitate the separation and migration of photogenerated carriers thereby reducing the probability of recombination.
研究领域:
材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Shuang Hou,Min Ma,Chun Wang,Peifang Wang,Zhe Ji,Shufang Tian,Mingxue Li
The generation of oxygen vacancies assumes a pivotal role in the photocatalytic degradation of antibiotics. Surface oxygen vacancies serve as deterrents to the recombination of photogenerated carriers, thereby augmenting photocatalytic efficiency. In this work, the NaBH 4 reduction technique was adopted to introduce oxygen vacancies onto the surface of Ta 2 O 5-x , thus enhancing its photocatalytic powers. Remarkably, the photocatalytic activity of the modified Ta 2 O 5-x -0.5 M samples exhibited significant improvement upon treatment with NaBH 4 solution at varied concentrations. Characterization of the modified Ta 2 O 5-x samples was conducted using a suite of techniques including XRD, FT-IR, UV–vis DRS, ESR, XPS, and EPR. Notably, the EPR spectrum provided compelling evidence of the presence of oxygen vacancies, affirming their existence on the surface of the modified Ta 2 O 5-x samples. To further corroborate the formation of oxygen vacancies, tetracycline (TC) solution was employed as a simulated pollutant, revealing a marked enhancement in visible light catalytic activity through experimental observations. The findings elucidate that the defect sites engendered by oxygen vacancies primarily enhance the efficiency of electron-hole pair separation and facilitate greater absorption of visible light, thereby amplifying photocatalytic activity. The modification of Ta 2 O 5-x samples by NaBH 4 reduction predominantly facilitates the introduction of oxygen vacancies on the surface, consequently bolstering photocatalytic performance. This exemplifies a noteworthy approach for significantly enhancing the photocatalytic activity of Ta 2 O 5-x , providing valuable insights for future design strategies.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 1
·016302
·
IF 2.025
Meizhen Zhuo,Chun-e Huang,Changzhi Zhao,Jiongjiong Yin,Chunying Shen
ZnO linear resistance ceramics were synthesized from ZnO–Al2O3–MgO–TiO2–SiO2–Ta2O5 by a conventional ceramics method. Effects of Ta2O5 on the phase composition, microstructures, and electrical properties of ZnO linear resistive ceramics were investigated. The results show that doping with appropriate amount of Ta2O5 can refine the grains of the main crystalline phase ZnO and the secondary crystalline phase ZnAl2O4 in terms of microstructure, and also can reduce the grain boundary barrier and optimize the I–V characteristics in terms of electrical properties. In addition, the doping of Ta2O5 can improve the stability of the resistivity , and the impedance frequency indicates that the doping of Ta2O5 makes the sample suitable for high-frequency electric fields. The resistivity of the sample doped with 0.2 mol% Ta2O5 is 56.2 Ω·cm, and this sample has the best grain boundary barrier height, nonlinear coefficient and temperature coefficient of resistance of 0.054 eV, 1.04 and −3.48 × 10−3 °C−1, respectively.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yuhan Fan,Yongze Cao,Meiling Li,Guojian Li,Shang Sun,Yichao Wang,Xu Sai,Jinsu Zhang,Baojiu Chen
L-Ta 2 O 5 :Er 3+ /Yb 3+ upconversion phosphors were synthesized by employing the molten salts method with B 2 O 3 as solvent. The optimal doping concentrations of Er 3+ and Yb 3+ are 0.2 and 2.5 mol%, respectively. The green upconversion luminescence (UCL) integral intensity of the acid-pickling sample reached 40% of β-NaYF 4 :Er 3+ /Yb 3+ under 980 nm laser excitation. Er 3+ /Yb 3+ may take the sites of Ta 5+ and insert into the interlayers of L-Ta 2 O 5 . Using the luminescence intensity ratio (LIR) technique, the relative temperature sensitivity was obtained to be 0.95 %K −1 at 303 K. L-Ta 2 O 5 :Er 3+ /Yb 3+ with outstanding pure green UCL intensity and high-temperature sensitivity can be applied to luminescence display and temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yapeng Kong,Longdi Ma,Heng Zhang,Xiwen Chen,Xuemin Liang,Liqiang Wang,Yangyang Fan,Yuran Chen
Aluminum-tantalum powders are emerging as new raw materials for additive manufacturing (AM) technologies, but their preparation in bulk quantities and in powder form via conventional metallurgical methods is challenging. In this study, we report a one-step synthesis of spherical Al 3 Ta powder by direct electrolyzing solid Ta 2 O 5 cathode ( vs . a graphite anode) in molten Na 3 AlF 6 -K 3 AlF 6 -AlF 3 -LiF-Al 2 O 3 . Cyclic voltammetry and constant potential electrolysis techniques were employed to characterize the electrochemical reaction process, along with X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) for the structural and morphological analyses. The process involves an initial Ta 2 O 5 electro-deoxygenation process, the subsequent electrodeposition of Al 3+ on the formed Ta particles and an in-situ alloying process. The innovative use of Ta 2 O 5 cathodes with a novel hierarchical porous structure allows for a controlled transformation of cathode particle morphology and facilitates the rapid generation of nanoscale tantalum particles. Al 3+ from the electrolyte is then electrodeposited onto these particles, initiating an in-situ alloying reaction. This is an exothermic process that facilitates the diffusion of aluminum atoms into tantalum, and reduces the interfacial energy promoting the formation of spherical Al 3 Ta particles. Such powders are in demand for AM techniques. The findings may now guide the way to establishing the electrochemical route for the short-process preparation of other high-temperature alloy powders.
研究领域:
材料科学
·
电化学工程
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产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 6
·811
·
IF 4.034
Shun Zhou,Zefeng Deng,Zhongkang Wu,Mei Xie,Yaling Tian,Yiyong Wu,Jun Liu,Guangli Li,Quanguo He
l-tryptophan is one of the eight kinds of essential amino acids for sustainable human life activity. It is common to detect the concentration of tryptophan in human serum for diagnosing and preventing brain related diseases. Herein, in this study, GCE (glassy carbon electrode) modified by Ta2O5-reduced graphene oxide (-rGO) composite (Ta2O5-rGO-GCE) is synthesized by the hydrothermal synthesis-calcination methods, which is used for detecting the concentration of tryptophan in human serum under the as-obtained optimal detection conditions. As a result, the obtained Ta2O5-rGO-GCE shows larger electrochemical activity area than other bare GCE and rGO-GCE due to the synergistic effect of Ta2O5NPs and rGO. Meanwhile, Ta2O5-rGO-GCE shows an excellent response to tryptophan during the oxidation process in 0.1 M phosphate buffer solution (pH = 6). Moreover, three wide linear detection range (1.0–8.0 μM, 8.0–80 μM and 80–800 μM) and a low limit of detection (LOD) of 0.84 μM (S/N = 3) in the detection of tryptophan are also presented, showing the larger linear ranges and lower detection limit by employing Ta2O5-rGO-GCE. Finally, the as-proposed Ta2O5-rGO-GCE with satisfactory recoveries (101~106%) is successfully realized for the detection of tryptophan in human serum. The synthesis of Ta2O5-rGO-GCE in this article could provide a slight view for the synthesis of other electrochemical catalytic systems in detection of trace substance in human serum.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Lina Tian,Yiping Zhang,Linjuan Dai,Changhui Xin,Qian Li,Yanting Tang,Xin Yu
Fabrication of tantalum-based composite photocatalysts with high-performance for dealing with organic pollutants remains valuable and highly urgent nowadays. In this work, amorphous In 2 S 3 decorated Ta 2 O 5-x mesocrystals were fabricated for tetracycline degradation under visible-light irradiation. The introduction of amorphous In 2 S 3 highly improved the visible-light absorption and charge separation, and the prepared In 2 S 3 /Ta 2 O 5-x mesocrystals showed highly enhanced photocatalytic performance towards tetracycline degradation, and the corresponding rate constant was approximately 0.00658 min −1 , which was 5.58 times that of In 2 S 3 and 3.64 times that of Ta 2 O 5-x mesocrystals. The enhanced visible-light photocatalytic performance for the In 2 S 3 /Ta 2 O 5-x mesocrystals was mainly attributed to the fabrication of strongly combined interface between In 2 S 3 and Ta 2 O 5-x mesocrystals.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 12
·1-10
·
IF 2.132
Zhang Sainan,Feng Min,Liu Ying,Wang Daoai
Ta 2 O 5 -TiO 2 heterojunction photocatalysts with a structure of TiO 2 nanodots deposited on Ta 2 O 5 nanotube (NTs) were prepared by anodization and in situ growth methods following annealing treatment. The heterojunction photocatalytic material exhibited enhanced photodegradation behavior of methylene blue (MB) and photoelectrochemical water splitting performance under simulated solar light. The degradation rate of MB and photocurrent density of heterojunction is 3.99 and 8.33 times higher than that of pure Ta 2 O 5 NTs respectively. The synergetic effect of the phase heterojunction and highly ordered structure increased the specific surface area and improved the separation and transmission efficiency of photogenerated electrons and holes, thereby enhancing the photocatalytic activities. Hence, Ta 2 O 5 TNs-TiO 2 nanodots heterojunction has promising application in the fields of photodegradation, photoelectrochemical water splitting, solar cells, and other photocatalytic devices. Graphical abstract
The heterojunction photocatalytic material exhibits enhanced photodegradation behavior of methylene blue (MB) and photoelectrochemical water splitting performance under simulated solar light. The degradation rate of MB is 3.17and 3.99 times higher than that of pure TiO 2 NTs and Ta 2 O 5 NTs, respectively; the photocurrent density increases by 8.33 times and 1.6 times compared with pure Ta 2 O 5 NTs and TiO 2 , respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jielin Huang,Shuaifei Liu,Wen Long,Qi Wang,Xin Yu,Shijie Li
Fabricating rapid and high-efficient charge-transfer pathways is contributing to improving charge separation and receiving extensive concerns in preparation of semiconductors composites photocatalysts. In this work, ternary Ag/AgCl/Ta 2 O 5−x mesocrystals were fabricated for visible-light photodegradation of emerging pollutants by introducing Ag/AgCl nanoparticles into defects engineered Ta 2 O 5−x mesocrystals. The prepared composites showed efficient visible-light absorption and efficient visible-light photodegradation of emerging pollutants, mainly attributed to the fabricating of high-efficient Z-scheme charge-transfer pathways between Ag/AgCl and Ta 2 O 5−x mesocrystals. Note that, the experimental results also demonstrated the significant roles of defects engineered Ta 2 O 5−x mesocrystals in fabricating high-efficient Z-scheme charge-transfer pathways. Besides, the prepared Ag/AgCl and Ta 2 O 5−x composites could be employed for efficient visible-light photodegradation of many other organic contaminants. Current work indicates a promising and high-performance visible-light composite photocatalyst for dealing with emerging contaminants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yanting Tang,Jielin Huang,Shuaifei Liu,Dandan Xiang,Xinqi Ma,Xin Yu,Mingxue Li,Quanhui Guo
Mesocrystals are types of fascinating multifunctional materials in fabricating rapid charge transport pathways, and surface engineering could be considered as a significant influencing factor in boosting charge separation for efficient photocatalytic application. In this work, surface engineered Ta 2 O 5−x mesocrystals were synthesized by facile alkali treatment strategy for enhanced visible light photocatalytic tetracycline degradation. The highly enhanced photocatalytic activity could be attributed to the highly increased surface areas and surface hydroxyl groups to compare with those of commercial Ta 2 O 5 and pristine Ta 2 O 5−x mesocrystals, which could provide more surface reactive sites and high electron density center for trapping photo-generated holes. Besides, possible tetracycline transformation pathways over surface engineered Ta 2 O 5−x mesocrystals and visible light photocatalytic mechanism were also proposed in this work. Current work also provides a facile strategy for regulating surface property of ultrawide bandgaps semiconductors for enhanced visible light photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Yuanzhi Hong,Zhenyuan Fang,Bingxin Yin,Bifu Luo,Yong Zhao,Weidong Shi,Changsheng Li
The photocatalytic water splitting for generation of clean hydrogen energy has received increasingly attention in the field of photocatalysis . In this study, the Ta 2 O 5 /g-C 3 N 4 heterojunctions were successfully fabricated via a simple one-step heating strategy. The photocatalytic activity of as-prepared photocatalysts were evaluated by water splitting for hydrogen evolution under visible-light irradiation (λ > 420 nm). Compared to the pristine g-C 3 N 4 , the obtained heterojunctions exhibited remarkably improved hydrogen production performance. It was found that the 7.5%TO/CN heterojunction presented the best photocatalytic hydrogen evolution efficiency, which was about 4.2 times higher than that of pure g-C 3 N 4 . Moreover, the 7.5%TO/CN sample also displayed excellent photochemical stability even after 20 h photocatalytic test. By further experimental study, the enhanced photocatalytic activity is mainly attributed to the significantly improve the interfacial charge separation in the heterojunction between g-C 3 N 4 and Ta 2 O 5 . This work provides a facile approach to design g-C 3 N 4 -based photocatalyst and develops an efficient visible-light-driven heterojunction for application in solar energy conversion .
研究领域:
材料科学
·
能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）