[논문]Relaxation dynamics of photoexcitations in TiO2 and its composites with Au/carbon nanotube (graphene)

Chinh, Vu Duc; Liem, Nguyen Quang; Cho, Han Saem; Jeoung, Sae Chae

doi:10.1016/j.catcom.2020.105970

[해외논문] Relaxation dynamics of photoexcitations in TiO2 and its composites with Au/carbon nanotube (graphene) 원문보기

Catalysis communications, v.139, 2020년, pp.105970 -

Chinh, Vu Duc (Institute of Materials Science, Vietnam Academy of Science and Technology) , Liem, Nguyen Quang (Institute of Materials Science, Vietnam Academy of Science and Technology) , Cho, Han Saem (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science) , Jeoung, Sae Chae (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science)

Abstract ▼ AI-Helper

Abstract 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. Highlights Carbonnanotubes(Graphene)-Au/TiO2 heterogeneous photo-catalysts were synthesized. Their photoluminescence on the UV range corresponding to their temporal profiles. The origin of photoluminescence of heterogeneous photo-catalysts was discussed. The relationship between their photoluminescence and photoactivities was discussed. The tendency of non-stoichiometric reduced as TiO2 integrated with these composites. Graphical abstract [DISPLAY OMISSION]

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