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Research Paper

Surface Chemistry of ZnO Nanowires for Nanosensor Applications

[+] Author and Article Information
Anurag Gupta

Electrical and Computer Engineering, University of Alabama, Tuscaloosa, AL 35487

Bruce C. Kim1

Electrical and Computer Engineering, University of Alabama, Tuscaloosa, AL 35487bruce.kim@ua.edu

Clifton C. Watkins, Shane C. Street

Department of Chemistry, University of Alabama, Tuscaloosa, AL 35487

Eugene Edwards, Christina Brantley, Paul Ruffin

RDECOM/AMRDEC, U.S. Army, 5400 Fowler Road, Redstone Arsenal, AL 35898

1

Corresponding author.

J. Nanotechnol. Eng. Med 2(1), 011010 (Feb 07, 2011) (4 pages) doi:10.1115/1.4003306 History: Received December 05, 2010; Revised December 17, 2010; Published February 07, 2011; Online February 07, 2011

In this work, surface modification of ZnO nanowires (NWs) with oleic acid is reported. ZnO NWs were synthesized in a customized chemical vapor deposition furnace and were characterized with scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy. Raman and infrared spectroscopies were used to determine that oleic acid modifies the ZnO NW surface with the carboxylate group attached to the surface. The study of the surface chemistry of ZnO NWs provides information about the class of compounds that modify ZnO NWs. This information will assist in tailoring the interface of NWs with appropriate compounds for fabricating nanosensors with high selectivity.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Surface functionalization of ZnO nanowire

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Figure 2

X-ray diffraction spectrum of as-synthesized NWs

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Figure 3

(a) Unmodified, as-synthesized ZnO NWs at 3700× magnification; (b) oleic acid modified ZnO NWs at 22,000 magnification. Scale on both images is 1 μm.

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Figure 4

(a) EDS spectrum of as-synthesized NWs; (b) wavelength dispersive spectroscopy spectrum of modified NWs showing the presence of carbon peak from oleic acid

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Figure 5

(a) Raman spectrum of as-synthesized ZnO NWs; (b) Raman spectrum of modified ZnO NWs

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Figure 6

FTIR spectra of (a) oleic acid 1% v/v in hexane and (b) oleic acid modified ZnO

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