JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yuxian Duan,Dongyang Jiang,Zhi Li,Xiaodi Jiang,Zichen Wang,Qianxu Ye,Liexing Zhou,Mingjun Wang,Jinming Cai
In this work, a novel method was used to prepare KTaO 3 using KF and Ta 2 O 5 to prepare KTaO 3 nanocubes. Then graphene/ KTaO 3 (Gr/KTaO 3 ) composites were synthesized by in-situ growth of graphene on KTaO 3 nanocubes for the first time. The prepared KTaO 3 possesses a small crystallite size and high crystallinity. The Gr/KTaO 3 composites have higher photocatalytic efficiency compared to pure KTaO 3 . Particularly, Gr/KTaO 3 90 had the highest photocatalytic activity, as it was able to degrade 99.5% of rhodamine B (RhB) within 40 min. According to ultraviolet and visible spectrum (UV-Vis) spectra, the absorption sideband of composites redshifts to the visible light area. Based on the results of PL and EIS, the increasing photocatalytic efficiency can be credited to the fact that graphene provides an efficient channel for electron transfer , which promotes photogenerated electron-hole pairs separation. Moreover, a free-radical trapping test indicated that h + and •OH were the main species in the photodegradation. Our investigation results can serve as a valuable guideline for the development of efficient photocatalysts based on KTaO 3 and graphene, which can be used in the removal of organic pollutants during environmental cleanup.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
International Journal of Environmental Science and Technology
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2024
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IF 3
Xu X.,Zhu L.,Chen C.,Luo C.,Jin Z.,Sun Z.,Fu Z.T
The study employed a direct hydrothermal method to synthesize NiO/La-KTaO 3 heterojunction photocatalysts. The photocatalytic efficiency of the composites was assessed by their ability to destroy isoamyl xanthate in the presence of Ultraviolet light, mimicking the conditions seen in flotation wastewater. The results showed a significantly greater photocatalytic activity when comparing the composite catalyst to KTaO 3 . A photocatalytic reaction was performed utilizing a 40 mg NiO/K 1−x La x TaO 3 (x = 0.04) photocatalyst at pH = 3. The reaction was carried out using 50 mL of isoamyl xanthate synthesis wastewater, which had a concentration of 20 mg/L. The degradation rate achieved after 30 min was 87.28%. The addition of nickel oxide (NiO) and the introduction of La into the K lattice position were thought to facilitate charge separation, migration, and the generation of additional active sites, hence augmenting the catalytic impact. The findings from radical capture tests indicated that the ·O 2− (superoxide ion) served as the principal active species in the photocatalytic process, playing a substantial role. The process of photodegradation of isoamyl xanthate was determined through the utilization of different analytical and testing methods. This work introduces a direct and effective approach for the eco-friendly decomposition of xanthate flotation wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Materials
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2019
·Vol. 12
·期 12
·1950
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IF 2.972
Shengding Chang,Muwei Ji,Changxu Yan,Kai Zhang,Qian Deng,Jian Xu,Caizhen Zhu,Bo Li,Jin Wang
KTaO3/Au hetero-nanostructures were synthesized by in-situ reduction of HAuCl4on the surface of hydrothermally-grown KTaO3sub-micron cubes. The concentration of Au source was found to be a critical factor in controlling the hetero-nucleation of Au nanoparticles on the surface of KTaO3sub-micron cubes. Loading of Au particles on KTaO3nanocrystals enriched KTaO3additional UV-vis absorption in the visible light region. Both KTaO3and KTaO3/Au nanocrystals were shown to be active in the photo-degradation of p-nitrophenol, while the loading of Au on KTaO3clearly improved the photo-degradation efficiency of p-nitrophenol compared to that on bare KTaO3nanocrystals, probably due to the improved light absorption and charge separation.Keywords:in-situ synthesis;KTaO3/Au hetero-nanostructures;concentration of Au source;photo-degradation of p-nitrophenol
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2026
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IF 5.2
Jixiang Cai,Chuchu Xiao,Shuanhu Wang,Hong Yan,Kexin Jin
Two-dimensional electron gases (2DEGs) at oxide interfaces provide a versatile platform for exploring emergent electronic states arising from strong spin–orbit coupling, interfacial reconstruction, and broken inversion symmetry. Here, we report the realization of a multifunctional 2DEG at a SrHfO 3 /KTaO 3 (SHO/KTO) heterojunction film fabricated by pulsed laser deposition. The structural and spectroscopic characterizations confirm the formation of a well-crystallized SHO/KTO heterojunction films with a well-defined interface. By systematically varying the growth temperature and SHO deposition time, we demonstrate effective control over the interfacial electronic properties. In particular, increasing the SHO deposition time from 2 to 5 min induces an insulator-to-metal transition, with a Hall mobility reaching 99.5 cm 2 V −1 s −1 at 6 K. At low temperatures (T ≤ 10 K), the interface exhibits pronounced weak anti-localization, revealing strong spin–orbit coupling. Maekawa–Fukuyama analysis yields a Rashba spin-splitting energy of 16.61 meV at 2 K, indicating substantial Rashba-type spin–orbit interaction at the SHO/KTO interface. The heterostructures further display wavelength-dependent positive photoresponse and persistent photoconductivity, with a biexponential relaxation behavior indicative of multiple carrier relaxation/trapping channels. Remarkably, an electrically switchable ferroelectric-like polarization state is also observed at the interface, with its magnitude strongly dependent on SHO thickness. These results demonstrate the coexistence of metallic 2DEG conduction, strong Rashba spin–orbit coupling, persistent photoresponse, and ferroelectric-like polarization in a single 5d transition-metal-oxide heterostructure. The SHO/KTO interface therefore provides a promising platform for investigating coupled spin–charge–polarization phenomena and for developing multifunctional oxide electronic and spintronic devices.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Guoliang Xue,Xuefan Zhou,Zhongna Yan,Gang Liu,Hang Luo,Dou Zhang
Nowadays, it remains a challenge to achieve a simultaneous improvement of dielectric constant, energy density, and temperature stability in dielectric ceramics . In this work, it was found that such drawback could be effectively resolved by using KTaO 3 to substitute Na 0.5 Bi 0.5 TiO 3 . In (1- x )Na 0.5 Bi 0.5 TiO 3 - x KTaO 3 ceramics, the temperature coefficient of capacitance (TCC) of x = 0.10 composition is lower than 15% in the temperature range of 25–390 °C, with a high dielectric constant of 2008 and a low dielectric loss of 0.0044 at 150 °C. Meanwhile, a large discharged energy density of ~2.50 J/cm 3 with the variation less than± 3% in 5–190 °C was obtained under a low electric field of 18 kV/mm in x = 0.20 composition, accompanied with a high energy efficiency of> 80%. These results reveal that this ceramic system is a promising candidate for temperature-stable dielectric and energy storage capacitors applications.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
KEY ENGINEERING MATERIALS
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2019
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IF 0
Sheng Ding Chang,Mu Wei Ji,Chang Xu Yan,Bo Li,Jin Wang
Potassium tantalates is one kind of important semiconductor with potential applications on photoelectric transformation and photocatalysis. Herein, Au nanoparticles were grown on the surface of two kinds of potassium tantalates, KTaO3 nanocubes and K2Ta2O6 nanooctahedron, by flexible reducing HAuCl4, and KTaO3/Au and K2Ta2O6/Au hetero-nanostructures were formed. Although the Au nanoparticles loading enhances the light absorption, KTaO3/Au and K2Ta2O6/Au hetero-nanostructures exhibit different photoelectric properties. The difference of photoelectric properties of two kinds of potassium tantalates/Au hetero-structures hint the photoelectric-property enhancement depends on multiple factors.
研究领域:
材料科学
·
半导体物理
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产品关联
DOI
危险品化学品经营许可证（带存储）