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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effect of Water on the Behavior of Semiconductor Quantum Dots in Zeolite Y: Aggregation with Framework Destruction with H-Y and Disaggregation with Framework Preservation for NH4+-Y

2012년 2월 16일 15시 01분 18초
INOR.P-226 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
김현성, 윤경병
서강대학교 화학과, Korea
Treatment of dry M2+-exchanged zeolite Y (M2+ = Cd2+, Mn2+, and Zn2+) with dry H2S leads to the formation of isolated, ligand-free, subnanometer metal sulfide quantum dots (QDs) in zeolite Y without framework destruction and with H+ as the counter cation. Treatment of the dry H+/CdS QD-incorporating zeolites Y with dry NH3 leads to the neutralization of H+ to NH4+. During this process, the framework structure remains intact. However, small amounts of interconnected CdS QDs were formed within the zeolite Y by coalition of isolated CdS QDs at the windows. With H+ as the counter cation, isolated CdS QDs rapidly aggregate into interconnected and mesosized QDs with accompanying destruction of ~50% of sodalite cages leading to the framework rupture. With NH4+ as the counter cation, however, the isolated QDs and zeolite framework remain intact even after exposure to the moist air for 4 weeks. Interestingly, the interconnected QDs that were formed during neutralization of H+ with NH3 disintegrate into isolated QDs in the air. Similar results were obtained from ZnS and MnS QDs generated in zeolite Y. Thus, ligand-free, naked, subnanometer QDs can now be safely preserved within zeolite pores under the ambient conditions for long periods of time. This finding will expedite the generation and dispersion of various QDs in zeolite pores, their physicochemical studies, and applications.