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RISS 인기검색어
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- 저자 : Shunsheng Chen (검색결과 2 건)
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Effects of Sulfur Sources on the Microstructure and Photocatalytic Activity of ZnIn2S4 Microspheres
Shunsheng Chen,Shaozhen Li,Liangbin Xiong,Guohong Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
Two kinds of hexagonal ZnIn2S4 samples have been synthesized by applying different sulfur sources of cysteine and thioacetamide (TAA) in a hydrothermal process. The two samples have the same crystal structure but different visible-light absorption and photodegradation activity of methyl orange. The results of Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM) revealed that, compared with ZnIn2S4 prepared using cysteine as sulfur source, ZnIn2S4 samples prepared using TAA possess much higher specific surface areas, smaller particle size and rather thinner nanosheets, which not only can enhance the adsorption of methyl orange on the surface of catalysts but also improve the transport efficiency of photogenerated charge carries.
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Influence of oxygen vacancies on the EPIR effect in Nd0.7Sr0.3MnO3 ceramics
Dawei Shi,Shunsheng Chen,Di Liu,Lingfang Xu,Haibo Xiao,Changping Yang,Kaiying Wang 한국물리학회 2015 Current Applied Physics Vol.15 No.8
Nd0.7Sr0.3MnO3 polycrystalline ceramic samples (NSMO) were synthesized by solid state reaction with a post annealing for parts of samples under different partial pressures of oxygen at 1350 ℃ for 12 h. XRD shows that all the samples are in single phase with a perovskite structure. The electrical transport measurement implies that the oxygen concentration has an important influence on the electrical pulse induced resistance, i.e. the EPIR-effect, for NSMO samples. For the oxygen-enriched sample, which probably contains a smaller amount of oxygen vacancies, the I-V characteristic is linear with a very small resistance, and the EPIR-effect is not detectable within the experimental accuracy. However, after sintered and annealed in reducing atmospheres, an EPIR effect appears and even becomes stronger and more stable if the sintering atmosphere is more reducing than that of normal air condition. Besides, the I -V becomes nonlinear and the initial resistance increases with increasing deficiency of oxygen, which means that the oxygen vacancies and their deep level trap states play an important role for the EPIR effect of NSMO. In this manuscript, an oxygen vacancy trapped state model is put forward to explain the relation between oxygen concentration and the EPIR effect.
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