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Baik, Jeong Min
Nano Energy and Environmental Materials Lab
Research Interests
  • Nanogenerators, antimicrobial material, catalysis, smart sensors

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Conductance Control in VO2 Nanowires by Surface Doping with Gold Nanoparticles

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Title
Conductance Control in VO2 Nanowires by Surface Doping with Gold Nanoparticles
Author
Kim, Gil-HoKwak, YoungrealLee, InyealRathi, ServinBaik, Jeong MinYi, Kyung Soo
Issue Date
2014-09
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.6, no.17, pp.14812 - 14818
Abstract
The material properties of semiconductor nanowires are greatly affected by electrical, optical, and chemical processes occurring at their surfaces because of the very large surface-to-volume ratio. Precise control over doping as well as the surface charge properties has been demonstrated in thin films and nanowires for fundamental physics and application-oriented research. However, surface doping behavior is expected to differ markedly from bulk doping in conventional semiconductor materials. Here, we show that placing gold nanoparticles, in controlled manner, on the surface of an insulating vanadium dioxide nanowire introduces local charge carriers in the nanowire, and one could, in principle, completely and continuously alter the material properties of the nanowire and obtain any intermediate level of conductivity. The current in the nanowire increased by nearly 3 times when gold nanoparticles of 10(11) cm(-2) order of density were controllably placed on the nanowire surface. A strong quadratic space-charge limited (SCL) transport behavior was also observed from the conductance curve suggesting the formation of two-dimensional (2D) electron-gas-like confined layer in the nanowire with adsorbed Au NPs. In addition to stimulating scientific interest, such unusual surface doping phenomena may lead to new applications of vanadium dioxide-based electronic, optical, and chemical sensing nanodevices.
URI
https://scholarworks.unist.ac.kr/handle/201301/7345
DOI
10.1021/am504229n
ISSN
1944-8244
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