High-Yield Gas-Phase Laser Photolysis Synthesis of Germanium Nanocrystals for High-Performance Photodetectors and Lithium Ion Batteries

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• 作者：Chang Hyun Kim ; Hyung Soon Im ; Yong Jae Cho ; Chan Su Jung ; Dong Myung Jang ; Yoon Myung ; Han Sung Kim ; Seung Hyuk Back ; Young Rok Lim ; Chi-Woo Lee ; Jeunghee Park ; Min Seob Song ; Won-Il Cho
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：December 20, 2012
• 年：2012
• 卷：116
• 期：50
• 页码：26190-26196
• 全文大小：413K
• 年卷期：v.116,no.50(December 20, 2012)
• ISSN：1932-7455

文摘

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 a Nd:YAG pulsed laser. The as-grown Ge NCs are sheathed with thin (1鈥? nm) carbon layers, and size control (5鈥?00 nm) can be simply achieved using a quenching gas. The hybrid nanostructures of the quantum-confined Ge NCs and reduced graphene oxide (RGO) become transparent flexible photodetectors that respond sensitively over the UV鈥搗isible鈥揘IR wavelength range. Both Ge NCs and Ge鈥揜GO hybrids exhibit excellent cycling performance and high capacity of the lithium ion battery (800 and 1100 mA鈥塰/g after 50 cycles, respectively) as promising anode materials for the development of high-performance lithium batteries.