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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Increase of 3rd-Order Nonlinear Optical Activity of PbS Quantum Dots in Zeolite Y by Increasing Cation Size

2012년 2월 16일 15시 34분 28초
INOR.P-230 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
김현성, 윤경병
서강대학교 화학과, Korea
The 3rd-order nonlinear optical (3-NLO) activity of PbS quantum dots (QDs) encapsulated in zeolite Y has been expected to sensitively change upon changing the counter cation of the zeolite host. However, the ion exchange of the pristine counter cation, H+, with other cations has not been possible because the framework decomposes and the QDs aggregate immediately upon exposure of the PbS QDs-incorporating zeolite Y with H+ as the counter cation to the atmosphere. We now report that when H+ was transformed to NH4+, the framework of PbS QD-containing zeolite Y does not undergo decomposition and the PbS QDs do not undergo aggregation to larger QDs during the aqueous ion exchange of NH4+ with alkali metal (MA+) ions, where MA+ = Li, Na+, K+, and Rb+. The 3-NLO activity of the MA+-exchanged PbS QD-incorporating zeolite Y film increases with increasing the size of MA+. The stabilization of the surface-bound exciton by the electron rich framework oxide and electron poor cation is proposed to be responsible for the increase. This is a first example to show a method to systematically increase the 3-NLO activity of QDs dispersed in a dielectric matrix by systematically changing its property, which will serve as a guideline for future researches. These results will also promote applications of QD-incorporating zeolites in various fields.