title: Nanoscale structural engineering via phase segregation: Au-Ge system.
abstract: A tunable structural engineering of nanowires based on template-assisted alloying and phase segregation processes is demonstrated. The Au-Ge system, which has a low eutectic temperature and negligible solid solubility (<10(-3) atom %) of Au in Ge at low temperatures, is utilized. Depending on the Au concentration of the initial nanowires, final structures ranging from nearly periodic nanodisk patterns to core/shell and fully alloyed nanowires are produced. The formation mechanisms are discussed in detail and characterized by in situ transmission electron microscopy and energy-dispersive spectrometry analyses. Electrical measurements illustrate the metallic and semiconducting characteristics of the fully alloyed and alternating Au/Ge nanodisk structures, respectively.
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: Yu-Lun
authors.initials: YL
authors.lastname: Chueh
authors.forename: Cosima N
authors.initials: CN
authors.lastname: Boswell
authors.forename: Chun-Wei
authors.initials: CW
authors.lastname: Yuan
authors.forename: Swanee J
authors.initials: SJ
authors.lastname: Shin
authors.forename: Kuniharu
authors.initials: K
authors.lastname: Takei
authors.forename: Johnny C
authors.initials: JC
authors.lastname: Ho
authors.forename: Hyunhyub
authors.initials: H
authors.lastname: Ko
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Fan
authors.forename: E E
authors.initials: EE
authors.lastname: Haller
authors.forename: D C
authors.initials: DC
authors.lastname: Chrzan
authors.forename: Ali
authors.initials: A
authors.lastname: Javey