title: Three synthetic routes to single-crystalline PbS nanowires with controlled growth direction and their electrical transport properties.
abstract: Single-crystalline rock-salt PbS nanowires (NWs) were synthesized using three different routes; the solvothermal, chemical vapor transport, and gas-phase substitution reaction of pregrown CdS NWs. They were uniformly grown with the [100] or [110], [112] direction in a controlled manner. In the solvothermal growth, the oriented attachment of the octylamine (OA) ligands enables the NWs to be produced with a controlled morphology and growth direction. As the concentration of OA increases, the growth direction evolves from the [100] to the higher surface-energy [110] and [112] directions under the more thermodynamically controlled growth conditions. In the synthesis involving chemical vapor transport and the substitution reaction, the use of a lower growth temperature causes the higher surface-energy growth direction to change from [100] to [110]. The high-resolution X-ray diffraction pattern and X-ray photoelectron spectroscopy results revealed that a thinner oxide-layer was produced on the surface of the PbS NWs by the substitution reaction. We fabricated field effect transistors using single PbS NW, which showed intrinsic p-type semiconductor characteristics for all three routes. For the PbS NW with a thinner oxide layer, the carrier mobility was measured to be as high as 10 cm(2) V(-1) s(-1).
authors.affiliation: Department of Chemistry, Korea University, Jochiwon 339-700, Korea.
authors.forename: So Young
authors.initials: SY
authors.lastname: Jang
authors.forename: Yun Mi
authors.initials: YM
authors.lastname: Song
authors.forename: Han Sung
authors.initials: HS
authors.lastname: Kim
authors.forename: Yong Jae
authors.initials: YJ
authors.lastname: Cho
authors.forename: Young Suk
authors.initials: YS
authors.lastname: Seo
authors.forename: Gyeong Bok
authors.initials: GB
authors.lastname: Jung
authors.forename: Chi-Woo
authors.initials: CW
authors.lastname: Lee
authors.forename: Jeunghee
authors.initials: J
authors.lastname: Park
authors.forename: Minkyung
authors.initials: M
authors.lastname: Jung
authors.forename: Jinhee
authors.initials: J
authors.lastname: Kim
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim
authors.forename: Jin-Gyu
authors.initials: JG
authors.lastname: Kim
authors.forename: Youn-Joong
authors.initials: YJ
authors.lastname: Kim