APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lili Yang,Yong Yang,John R. Lombardi,Yusi Peng,Zhengren Huang
Semiconductor nanomaterials with the surface-enhanced Raman scattering (SERS) sensitivity are gradually attracting more and more attention due to their particular advantages. However, the wider applications of semiconductor SERS-active substrates still require considerable effort to improve their SERS sensitivity. An excellent enhancement of Raman scattering is achieved by Ta 2 O 5 superstructures with a mean diameter of 29 nm. The Ta 2 O 5 superstructure is constructed by crystallized Ta 2 O 5 quantum dots with an average diameter of 2.39 nm and exhibits a very low detection limit of 10 −7 M for both methyl violet and methylene blue molecules under the irradiation of 532 nm laser. The chemical enhancement, originating from the precise matching of energy levels and the facile charge transfer between Ta 2 O 5 superstructures and dye molecules, predominantly contributes to the Raman enhancement. The detailed band structure analysis in this work does a good demonstration for achieving the energy level matching and charge transfer enhancement in semiconductor SERS-active substrates with the probed molecules.
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Xinwei Geng,Yongfeng Xia,Ming Zhu,Jun Zhao,Dongxu Yao,Yu-Ping Zeng
Ti 4 O 7 is one of the most promising electrically functional materials among the Magnéli phase. To further broaden its applications in areas such as battery electrodes and pollutant treatment, extensive research has been conducted to optimize its mechanical and electrical properties. In this study, Ti 4 O 7 ceramics, as well as Al 2 O 3 and Ta 2 O 5 -doped Ti 4 O 7 ceramics, are fabricated via hot-press sintering using a solid-state method. While the introduction of secondary phases did not result in a significant improvement in the mechanical properties of Ti 4 O 7 ceramics, the effectiveness of Al–Ta co-doping in enhancing electrical conductivity is validated through three commonly used measurement techniques: the Van der Pauw method, the two-probe method, and the four-probe method, yielding conductivity increases of 46.20, 1.98, and 17.98%, respectively. Detailed electrical characterization further elucidated the electrical features of polycrystalline Ti 4 O 7 ceramics and effect of doping. Furthermore, the reaction between Ti 4 O 7 and Ta 2 O 5 , leading to the formation of the ternary oxide TiTaO 4 , is observed.
研究领域:
材料科学
·
陶瓷材料
·
电气工程
·
固态物理
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xin Yu,Jingjing Zhao,Jielin Huang,Jiawei Zhao,Yifan Guo,Yanting Tang,Xinqi Ma,Zhonghua Li,Quanhui Guo,Junwei Zhao
Harvesting broad spectral absorption and visible light photocatalysis of ultrawide bandgap semiconductors are one of most significative topics in the solar energy conversion and utilization fields. In this work, amorphous Cl-Ta 2 O 5−x microspheres were prepared by facile solvothermal method for stabilized visible light photocatalytic hydrogen generation. The acetone absorbed on the interfaces of Ta 2 O 5 nanoparticles induced the formation of oxygen vacancies , enhanced visible light absorption, and formation of Ta 2 O 5−x microspheres with preferred orientations as well as Cl doping. The Cl-Ta 2 O 5−x microspheres showed typical amorphous characteristics and obvious visible light absorption in comparison to those of commercial Ta 2 O 5 . More importantly, the prepared Cl-Ta 2 O 5−x microspheres also showed stabilized visible light photocatalytic hydrogen generation performance in the spectral regions of 400 nm ≤ λ ≤ 600 nm mainly because of the introduction of oxygen vacancy defects and Cl doping, which might significantly expand the application of tantalum oxide semiconductors in the broad spectral photocatalytic water splitting.
研究领域:
材料科学
·
能源转换与利用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Xin Yu,Jielin Huang,Jiawei Zhao,Chao Zhou,Changhui Xin,Quanhui Guo
Poriferous monocrystal-like nanostructures are contributing to fabricate long-distance charge transfer pathways and rapid diffusions of the degraded products, and attracts wide attentions. In this work, layered and poriferous (Al,C)–Ta 2 O 5 mesocrystals were fabricated by topotactic transformation strategy with Ta 4 AlC 3 MAX as starting materials for visible-light photocatalytic antibiotic degradation. The prepared sample exhibited enhanced visible-light absorption and visible-light photocatalytic performance, far superior to those of commercial Ta 2 O 5 and Ta 4 AlC 3 MAX, which was mainly because of the elemental doping in the samples. The experimental results also indicated that continuous attacks of the photo-generated holes and ·O 2 − species efficiently induced efficient visible-light photodegradation of tetracycline . Current work also indicates a new and potential tantalum-based semiconductors for high-performance environmental photocatalysis .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2021
·Vol. 29
·期 21
·34552-34564
·
IF 3.894
Zhiyuan Zhang,Zhaoxiang Li,Luyao Wang,Jinmeng Li,Jie Pan,Shuyun Wang,Chao Zhang,Zhen Li,Qianqian Peng,Xianwu Xiu
The composite substrate composed of precious metal, semiconductor and graphene has not only high sensitivity and uniform Raman signal but also stable chemical properties, which is one of the important topics in the field of surface-enhanced Raman scattering (SERS). In this paper, a sandwich SERS substrate based on tantalum oxide (Ta2O5) is designed and fabricated. The substrate has high sensitivity, stable performance and high quantification capability. The composite substrate can achieve a high sensitivity Raman detection of crystal violet (CV) with a detection limit of 10−11 M and an enhancement factor of 1.5 × 109. This is the result of the synergistic effect of electromagnetic enhancement and chemical enhancement, in which the chemical enhancement is the cooperative charge transfer in the system composed of probe molecules, silver nanoparticles (AgNPs) and Ta2O5, and the electromagnetic enhancement comes from the strong local surface plasmon resonance between the adjacent AgNPs. After exposing the composite substrate to the air for one month, the Raman signal did not weaken, indicating that the performance of the composite substrate is stable. In addition, there is an excellent linear relationship between the intensity of Raman characteristic peak and the concentration of probe molecules, which proves that the composite substrate has high quantification capability. In practical application, the composite SERS substrate can be used to detect harmful malachite green quickly and sensitively and has a broad application prospect in the field of food safety and chemical analysis.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Haijian Qin,Huaibiao Wang,Qing Xia,Chunzhi Zheng,Xiaonan Zhang,You Wu,Lei Peng,Fengli Yang,Songjian Zhao
Small size cobalt nanoparticles are highly dispersed on different crystalline forms of Ta 2 O 5 (amorphous, T, M, H) by impregnation method, which is then introduced to catalytic oxidation of CO. The experimental results show that Co 3 O 4 /M-Ta 2 O 5 exhibits the highest CO conversion efficiency compared with Co 3 O 4 loaded on amorphous-, T-, and H-Ta 2 O 5 , and the pure Co 3 O 4 and M-Ta 2 O 5 . The temperature of 90 % CO conversion rate is approximately 170 °C at the high space velocity of 780,000 h −1 . Besides, the effect of oxygen concentration, space velocity, CO concentration, as well as different ratio of Co: Ta on CO conversion have been studied. Moreover, XRD , SEM, TGA , BET and H 2 -TPR characterizations reveal that Co 3 O 4 is uniformly distributed and does not change the structure crystalline of Ta 2 O 5 , and there is strong interaction between cobalt active component and Ta 2 O 5 support, which might be beneficial for CO conversion. Furthermore, the reaction mechanism has been investigated by X-ray photon spectroscopy and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), which suggest that Co 3+ is the active component and lattice oxygen as well as adsorbed oxygen play a critical role in CO oxidation.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chao Wu,Heng Li,Shuang Cao,Zhi Li,Peng Zeng,Jiarui Chen,Xitong Zhu,Xiaowei Guo,Gairong Chen,Baobao Chang,Yongqiang Shen,Xianyou Wang
Benefiting from the extra contribution of O redox, Co-free Li-rich layered oxides (LRNMO) can satisfy the requirement of high specific capacities. However, during the high-voltage charging process, lattice oxygen being oxidized to O − or O 2 leads to a gradual transition of the structure from layered to spinel phase, capacity and voltage decline, hindering the practical application of LRNMO in the lithium-ion battery. Here, a surface modification strategy of Li 1.2 Ni 0.32 Mn 0.48 O 2-δ doped with Ta 5+ ions is proposed, in which the Ta 5+ ions occupy the lithium sites of the lattice structure on the surface layer of LRNMO and form a Ta 2 O 5 coating layer. The modified electrode exhibits excellent rate performance and cycling stability, with 94.9% and 85.5% capacity retention rate and voltage retention rate, respectively, after 200 cycles at 1C. Moreover, the initial coulomb efficiency and ionic conductivity of the modified electrode are also apparently enhanced. Simultaneously, the decreased Li/Ni mixing degree of the modified electrode reflects the improvement of the structural stability . Therefore, the modification strategy through strong metal–oxygen bonding to integrate the surface structure to regulate the oxygen activity provides a new direction for the design of high energy density Co-free Li-rich cathode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2026
·Vol. 11
·期 10
·e07017
·
IF 2.3
Youchen Sun,Meng Gao,Aqing Chen,Jun Zhang
Ti/SnO 2 -Sb electrodes are widely used in electrocatalysis due to their high oxygen evolution potential (OEP) and low cost, but their practical application is limited by the short service life. In this study, Ti/SnO 2 -Sb electrodes were modified by introducing Ta 2 O 5 nanopowder through a thermal decomposition method to form SnO 2 -Ta 2 O 5 heterojunctions. The structural, morphological, and electrochemical properties of the electrodes with varying Ta 2 O 5 concentration were systematically investigated by XRD, XPS, FE-SEM, and electrochemical characterization techniques. Results show that Ta 2 O 5 incorporation induces lattice expansion, increases surface roughness, and improves the electrochemical active surface area by more than fourfold. The modified electrodes exhibit a significantly enhanced OEP of up to 2.20 V (vs. RHE), a threefold increase in double-layer capacitance, and a tenfold improvement (about 18 h) in accelerated service life under acidic conditions (100 mA/cm 2 ), compared to Ti/SnO 2 -Sb electrode. These findings demonstrate that Ta 2 O 5 doping effectively enhances catalytic activity, stability, and durability of Ti/SnO 2 -Sb electrodes, providing a promising strategy for the design of high-performance anodes for electrocatalytic applications.
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 19
·期 1
·
IF 3.2
Chenlong Zhao,Yaoyang Wang,Shuo Cheng,Yuhang You,Yi Li,Xianwu Xiu
Herein, a high-performance Ta2O5/AgNPs composite Surface-Enhanced Raman Scattering (SERS) substrate is engineered for highly sensitive detection of microplastics. Through morphology modulation and band-gap engineering, the semiconductor Ta2O5is structured into spheres and composited with silver nanoparticles (AgNPs), facilitating efficient charge transfer and localized surface plasmon resonance (LSPR). This architecture integrates electromagnetic (EM) and chemical (CM) enhancement mechanisms, achieving an ultra-low detection limit of 10−13M for rhodamine 6G (R6G) with excellent linearity. Furthermore, the three-dimensional “pseudo-Neuston” network structure exhibits superior capture capability for microplastics (PS, PET, PMMA). To address spectral interference in simulated complex environments, a multi-scale deep-learning model combining wavelet transform, Convolutional Neural Networks (CNN), and Transformers is proposed. This model achieves a classification accuracy of 98.7% under high-noise conditions, significantly outperforming traditional machine learning methods. This work presents a robust strategy for environmental monitoring, offering a novel solution for precise risk assessment of microplastic pollution.
研究领域:
环境科学
·
纳米材料
·
分析化学
·
光谱学
·
深度学习
·
污染监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Lin An,Xin Han,Yaogang Li,Hongzhi Wang,Chengyi Hou,Qinghong Zhang
Tantalic oxide (Ta 2 O 5 ), as an excellent transition metal oxide photocatalyst , has been extensively studied on fluorination or self-doped for hydrogen production , while there is little research to combine the two modifications. In this work, surface fluorination self-doped Ta 2 O 5 nanoshuttles (FTNSs) photocatalyst is synthesized successfully by a modified one-step hydrothermal method . The test results show the presence of surface fluorine ions , Ta 4+ and oxygen vacancies in the sample. The FTNSs prepared by hydrothermal method under 180 °C for 24 h exhibits the highest hydrogen evolution rate (HER). The HER is 179.2 and 19.78 μmol h −1 g −1 in the absence of any co-catalyst under full-spectrum and simulated solar light, respectively, which is higher than that of the Ta 2 O 5 nanoshuttles without fluoride and the commercial Ta 2 O 5 . The higher HER can attribute to the existence of F, Ta 4+ and oxygen vacancies, which enhance the photogenerated carrier mobility and reduce the recombination.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2019
·
IF 2.6
J.L. Liu,Y.B. Xiao,S.J. Huang,L.Y. Mao,W.C. Wang,Q.Y. Zhang
An Er 3+ -doped TeO 2 − Ta 2 O 5 − ZnO (TTZ) tellurite glass has been investigated to explore its possible application in mid-infrared laser glass and fiber lasers . Glass-forming region of the ternary TTZ glass system was determined based on the thermodynamic calculation and experiments. Physical and optical properties of the TTZ glass were characterized in detail by using Raman, different scanning calorimetry , luminescence spectra , and fluorescence decay curves. An intense 2.7 μm emission was observed in Er 3+ -doped TTZ glasses upon the excitation of 980 nm laser diode (LD). The excellent thermal stability ( △T max = 203 °C), low maximum phonon energy (~770 cm −1 ), high emission cross-section (0.82 × 10 −20 cm 2 ) and spectroscopic figure of merit (3.22 × 10 −24 cm 2 s) indicate that the Er 3+ -doped TTZ glass could be a promising candidate for efficient ~ 3 μm fiber lasers and amplifiers.
✓ 已验证
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Zhengkun Xie,Gaiping Li,Yamin Fu,Mengjiao Sun,Baoxian Ye
Chrysin and baicalein are the major flavonoids found in oroxylum indicum, an essential herb in traditional Chinese medicine (TCM). Owing to their similar characteristics and physiochemical property, it is a great challenge to detect both of them simultaneously. In this work, tantalum oxide (Ta 2 O 5 ) particles and chitosan modified carbon paste electrode (Ta 2 O 5 -CTS-CPE) was prepared and characterized by scanning electron microscope (SEM), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), cyclic voltammetry (CV) and electrochemical impedance spectrum(EIS). Under the optimum conditions, the prepared Ta 2 O 5 -CTS-CPE exhibited excellent electrocatalytic activity toward the oxidation of chrysin and baicalein, and it could serve as the sensor for highly sensitive and simultaneous determination both of them. The linear range is 0.08–4.0 μM for both of them, and the detection limits were determined to be 0.03 and 0.05 μM (S/N=3) for chrysin and baicalein, respectively. Furthermore, the proposed electrochemical sensor displayed high sensitivity, excellent stability and got satisfactory results in oroxylum indicum samples analysis.
研究领域:
分析化学
·
中药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）