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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Structure Analysis of Twin and Superlattice Nanowires Using Transmission Electron Microscopy

2011년 8월 1일 15시 10분 23초
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금 <발표Ⅲ>
저자 및
백승혁, 김한성, 장동명, 정찬수, 박정희
고려대학교 소재화학과, Korea
Transmission Electron Microscopy is very giant equipment. It is possible to get High-Resolusion Image and SAED pattern. Among a lot of HR-image, introduce Twin and Superlattice structure to you. We were synthesized by using themal evaporation method for Zn3 P2, InAs, Cu1.8S, and In-doped ZnO nanowires with twin or superlattice structures. The Zn3P2 nanowires adopt a unique superlattice structure that consists of twinned octahedral slice segments having alternating orientations along the axial [111] direction of a pseudo cubic unit cell. The apexes of the octahedral slice segment are indexed as six equivalent <112> directions at the [111] zone axis. At each 30° turn, the straight and zigzagged morphologies appear repeatedly at the <112> and <011> zone axes, respectively. The twinned InAs nanowires is virtually the same as that of the twinned Zn3P2 nanowires. The Cu1.8S nanowires consisted of superlattices along the <111> direction, with controlled growth direction ([110], [211], [100], [111]) and superlattice periods of 1.6 and 1.9 nm. As the temperature decreased, the growth direction evolved from [100] to the higher surfaceenergy [110] or [211] directions, with longer superlattice periods. Also, we were synthesized for the In-doped ZnO nanowires, and HR-TEM imaging show a unique longitudinal superlattice structure of one In-O layer and five (or six) Zn-O layer slabs stacked alternately perpendicular to the long axis, with a modulation period of 1.65 (or 1.9) nm.