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DOI	10.1016/j.catcom.2020.105970
	Relaxation dynamics of photoexcitations in TiO2 and its composites with Au/carbon nanotube (graphene)
	Chinh V.D.; Liem N.Q.; Cho H.S.; Jeoung S.C.
发表日期	2020
ISSN	15667367
卷号	139
英文摘要	In this study, the relaxation dynamics of photoexcitations in anatase TiO2 nanoparticles (NPs) and their composites with metal (Au), non-metal (carbon nanotube CNT, graphene G) and combination of them (CNT-Au, G-Au) as well as its implications on the photocatalytic activities are presented. The peak positions for the steady-state photoluminescence observed at about 3 eV are invariant while the defects-related emission at visible region is blue-shifted, which depends on the nature of foreign material in the composites. Using ps time-resolved photoluminescence measurement, the decay time constants for these photoexcitations decreased with forming the composites. Concretely, the charge transfer time in TiO2 NPs is about 35.8 ps, which is longer than that in its composites, in the range of 9.7–28.7 ps. Their Raman spectra supported the plausible photodynamics of TiO2 nanocomposites that is proposed to describe the participation of photoexcitations in the photocatalytic reaction through charge separation between the different nanomaterials. © 2020 Elsevier B.V.
英文关键词	Composites; Photocatalyst; Photoexcitations; Relaxation dynamics
scopus关键词	Blue shift; Carbon nanotubes; Charge transfer; Composite materials; Dynamics; Graphene; Metal nanoparticles; Photocatalysts; Photocatalytic activity; Photoexcitation; Photoluminescence; Relaxation processes; TiO2 nanoparticles; Titanium dioxide; Anatase TiO2 nanoparticles; Charge separations; Decay time constant; Foreign materials; Photo-excitations; Photocatalytic reactions; Relaxation dynamics; Time-resolved photoluminescence; Gold compounds
来源期刊	Catalysis Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176921
作者单位	Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam; Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, Yuseong-gu, Daejeon, 34113, South Korea
推荐引用方式 GB/T 7714	Chinh V.D.,Liem N.Q.,Cho H.S.,et al. Relaxation dynamics of photoexcitations in TiO2 and its composites with Au/carbon nanotube (graphene)[J],2020,139.
APA	Chinh V.D.,Liem N.Q.,Cho H.S.,&Jeoung S.C..(2020).Relaxation dynamics of photoexcitations in TiO2 and its composites with Au/carbon nanotube (graphene).Catalysis Communications,139.
MLA	Chinh V.D.,et al."Relaxation dynamics of photoexcitations in TiO2 and its composites with Au/carbon nanotube (graphene)".Catalysis Communications 139(2020).