119th General Meeting of the KCS

Type Poster Presentation
Area 물리화학
Room No. 포스터발표장
Time 4월 20일 (목요일) 11:00~12:30
Code PHYS.P-15
Subject Photohydroxylation of ZnS nanobelts for enhanced photocatalytic performances
Authors 함수호, 장두전*
서울대학교 화학부, Korea
Abstract 1D nano-materials like nanorods, nanowires, and nanobelts have been received extensive attention because of their unique properties such as large surface area and high electron transfer efficiency. We have synthesized ZnS nanobelts via a one-pot hydrothermal method. Because ZnS is direct band-gap semiconductor material, the recombination of excited electrons and holes is very fast. To hinder the recombination of charge carriers and to increase the charge-carrier lifetime, we have formed Zn(OH)2 on the surface of the ZnS nanobelts via addition of hydrogen peroxide and Xenon lamp irradiation. By forming the Zn(OH)2 on the surface of ZnS nanobelts, heterojunction between ZnS and Zn(OH)2 have been formed, thus the excited charge carriers have been separated effectively and the lifetime of the excited charges have been increased. We have tested the photocatalytic efficiency of each sample via degradation test of 4-nitrophenol under Xenon lamp irradiation. The optimized sample showed 2.5 times higher photocatalytic activity compared to pristine ZnS nanobelts. Also, we have revealed the photocatalytic mechanism via PL analysis and reactive species tests by using radical scavengers such as p-benzoquinone (·O2-), EDTA (h+), and isopropyl alcohol (·OH).
E-mail dezolbe@snu.ac.kr