Three Synthetic Routes to Single-Crystalline PbS Nanowires with Controlled Growth Direction and Their Electrical Transport Properties

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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 (1001 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).
Publisher
AMER CHEMICAL SOC
Issue Date
2010-04
Language
English
Article Type
Article
Keywords

ONE-DIMENSIONAL NANOSTRUCTURES; ULTRATHIN GOLD NANOWIRES; CORE-SHELL NANOWIRES; CATION-EXCHANGE; CHEMICAL CONVERSION; ORIENTED ATTACHMENT; QUANTUM DOTS; ION-EXCHANGE; CHALCOGENIDE NANOWIRES; VAPOR TRANSPORT

Citation

ACS NANO, v.4, no.4, pp.2391 - 2401

ISSN
1936-0851
DOI
10.1021/nn100163k
URI
http://hdl.handle.net/10203/98078
Appears in Collection
CH-Journal Papers(저널논문)
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