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110th General Meeting of Korean Chemical Society High-Yield Gas-Phase Laser Photolysis Synthesis of Germanium Nanocrystals for High-Performance Photodetectors and Lithium Ion Batteries

Submission Date :
8 / 31 / 2012 , 09 : 58 : 55
Abstract Number :
Presenting Type:
Poster Presentation
Presenting Area :
Authors :
김창현, 조용재, 명윤, 장동명, 정찬수, 김한성, 임형순1, 박정희, 차은희2
고려대학교 소재화학과, Korea
1고려대학교 미세소자공학협동/마이크로소자공학, Korea
2호서대학교 그린에너지 공학과 대학원, Korea
Assigned Code :
MAT.P-1374 Assigend Code Guideline
Presenting Time :
10월 17일 (수요일) 16:00~19:00
We developed a new high-yield synthesis method of free-standing germanium nanocrystals (Ge NCs) by means of the gas-phase photolysis of tetramethyl germanium in a closed reactor using an Nd-YAG pulsed laser. Size control (5-100 nm) can be simply achieved using a quenching gas. The Ge1-xSix NCs were synthesized by the photolysis of a tetramethyl silicon gas mixture and their composition was controlled by the partial pressure of precursors. The as-grown NCs are sheathed with thin (1-2 nm) carbon layers, and well dispersed to form a stable colloidal solution. The hybrid nanostructures of Ge NC and reduced graphene oxide (RGO) became transparent flexible photodetectors that respond sensitively over the UV-visible-NIR wavelength range. Both Ge NC and Ge-RGO hybrids exhibit excellent cycling performance and high capacity of the lithium ion battery (800 and 1100 mA h/g after 50 cycles, respectively) as promising anode materials for the development of high-performance lithium batteries. This novel synthesis method of Ge NCs is expected to contribute to expand their applications in high-performance energy conversion systems.