title: Size tailoring of aqueous germanium nanoparticle dispersions.
abstract: We demonstrate a practical route to synthesize Ge nanoparticles (NPs) in multi-gram quantities via the laser pyrolysis of GeH4 gas. The size of the as-produced Ge NPs can be precisely controlled in the range of 19.0 to 65.9 nm via a subsequent etching procedure using a dilute H2O2 solution. Stable water dispersions of Ge NPs yield particles with a Ge/GeO2 core-shell structure, however, the oxide shell can easily be removed and passivated by treatment with HCl. The feed materials used in this process are readily available and lead to non-toxic, water-based dispersions of Ge NPs. The scalability and convenience of this procedure make it attractive as a method to obtain Ge NP dispersions for use in applications such as optoelectronic devices and biosensors.
authors.affiliation: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea. jykim@unist.ac.kr.
authors.forename: Seongbeom
authors.initials: S
authors.lastname: Kim
authors.forename: Bright
authors.initials: B
authors.lastname: Walker
authors.forename: Song Yi
authors.initials: SY
authors.lastname: Park
authors.forename: Hyosung
authors.initials: H
authors.lastname: Choi
authors.forename: Seo-Jin
authors.initials: SJ
authors.lastname: Ko
authors.forename: Jaeki
authors.initials: J
authors.lastname: Jeong
authors.forename: Myoung Hee
authors.initials: MH
authors.lastname: Yun
authors.forename: Jeong Chul
authors.initials: JC
authors.lastname: Lee
authors.forename: Dong Suk
authors.initials: DS
authors.lastname: Kim
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Kim