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제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Hydrothermal fabrication of porous ZnS photocatalysts with a controlled amount of S vacancies

2019년 1월 15일 11시 30분 15초
PHYS.P-81 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
Physical Chemistry
저자 및
Sooho Ham, Du-Jeon Jang*
Department of Chemistry, Seoul National University, Korea
2D Porous nanostructures have advantages like a high surface area, and high charge transfer rate for photocatalytic applications. In spite of these advantages, the applications of 2D porous nanostructures have been restricted because of complicate fabrication processes. To overcome the drawback, we have fabricated barbell-shaped porous ZnS nanostructures via a thermal decomposition of organic-inorganic hybrid precursor templates (ZnS·(ethylenediamine, en)0.5). Through the hydrothermal reaction of ZnS·(en)0.5, volatile en molecules has been eliminated to form porous ZnS nanostructures. The thermal transformation of nanocomposites causes crystal defects due to the rearrangement of atoms. These crystal defects can have both positive and negative effects on photocatalytic activity because the defect energy levels can separate excited charges or can act as the recombination sites of excited charges. Thus, controlling the surface defects is an important work to increase photocatalytic activities. During the hydrothermal treatments, it is possible to control the amount of S vacancies by varying the hydrothermal treatment time. The concentration of S vacancies have been estimated by measuring XPS spectra and photoluminescence (PL) spectra from S vacancies of porous ZnS nanostructures. When applied to photocatalytic RhB degradation, porous ZnS prepared by hydrothermal treatment for 4 h have exhibited 8.2 times higher photocatalytic activity than commercial ZnS. Overall, the facile hydrothermal treatment of ZnS·(en)0.5 has increased photocatalytic activities by forming surface sulfur vacancies, which lead to the separation of excited charges.