title: Fabrication and photoconductivity of macroscopically long coaxial structured Ag/Ag2S nanowires with different core-to-shell thickness ratios.
abstract: Macroscopically long core/shell structured Ag/Ag(2)S coaxial nanowires and Ag(2)S nanowires have been fabricated using the solid-state ionics method for Ag nanowires, combined with a subsequent gas-solid reaction, and characterized at different spatial scales. The photoconductive properties of such samples are investigated by performing transport measurements with 532 nm laser illumination ON/OFF cycles under different bias. A significant change in the photoconductivity from negative to positive has been observed in the coaxial structured Ag/Ag(2)S nanowires when the Ag(2)S layer thickness increases to a certain level. Such behaviors are ascribed to two photoconductive mechanisms in the Ag core and the Ag(2)S shell, respectively. These results indicate a promising approach to fabricate nanoscale photoswitches with different dark resistances and photoinduced currents based on the Ag/Ag(2)S coaxial nanowires for various optoelectronic applications.
authors.affiliation: Department of Physics and Key Laboratory of Atomic and Molecular Nanoscience of Education Ministry, Tsinghua University, Beijing, People's Republic of China. jlsun@tsinghua.edu.cn
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Sun
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Zhu
authors.forename: Xingchen
authors.initials: X
authors.lastname: Zhao
authors.forename: Yang
authors.initials: Y
authors.lastname: Bao