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http://dx.doi.org/10.5229/JKES.2012.15.3.181

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

Kim, Cang-Hyun (Department of Chemistry, Korea University)
Im, Hyung-Soon (Department of Chemistry, Korea University)
Cho, Yong-Jae (Department of Chemistry, Korea University)
Chung, Chan-Su (Department of Chemistry, Korea University)
Jang, Dong-Myung (Department of Chemistry, Korea University)
Myung, Yoon (Department of Chemistry, Korea University)
Kim, Han-Sung (Department of Chemistry, Korea University)
Back, Seung-Hyuk (Department of Chemistry, Korea University)
Im, Young-Rok (Department of Chemistry, Korea University)
Park, Jeung-Hee (Department of Chemistry, Korea University)
Song, Min-Seob (Center for Energy convergence, Korea Institute of Science and Technology)
Cho, Won-Il (Center for Energy convergence, Korea Institute of Science and Technology)
Cha, Eun-Hee (Graduated school of Green energy engineering, Hoseo University)
Publication Information
Journal of the Korean Electrochemical Society / v.15, no.3, 2012 , pp. 181-189 More about this Journal
Abstract
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 $Ge_{1-x}Si_x$ 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. Both Ge NC and Ge-RGO hybrids exhibit excellent cycling performance and high capacity of the lithium ion battery (800 and 1100 mAh/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.
Keywords
Germanium; Nanocrystals; Gas-phase photolysis; Nd-YAG pulsed laser; Ge-RGO hybrids; Lithium ion battery;
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