AVS 49th International Symposium
    Nanometer Structures Wednesday Sessions
       Session NS-WeP

Paper NS-WeP5
Gas Sensor Based on Metal and Metal Oxide Individual Nanowires and Nanowire Arrays

Wednesday, November 6, 2002, 11:00 am, Room Exhibit Hall B2

Session: Nanometer Structures B
Presenter: Y. Zhang, University of California, Santa Barbara
Authors: Y. Zhang, University of California, Santa Barbara
A. Kolmakov, University of California, Santa Barbara
G. Cheng, University of California, Santa Barbara
M. Moskovits, University of California, Santa Barbara
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We report on the approach, which can constitute a novel versatile platform for micro- and nanosensor application. Arrays of nanowires with tunable diameters and length in the range of 10-100 nm and 5-200 micrometers, respectively, were fabricated from the catalyticaly active materials inside close-packed nanochannel alumina templates. Electrodes deposited on the surfaces of these nanostructures provides electrical contacts which with the incorporated heaters determines the device architecture. In particular, metal (Cu, Ag, Pb, Pd) and metal oxide (SnO@sub2@) individual nanowires and their arrays were tested using HRTEM, XPS and Auger spectroscopy. Chemical reactivity and gas sensitivity toward hydrogen and carbon monoxide of individual and assemblies of Pd and SnO@sub2@ nanowires were assessed using conductivity measurements and TPD analysis. These structures based on single nanowires and nanowire arrays offer full range of options useful to gas sensing, including robustness, high surface-to-volume ratio, small size if required, functionalization via doping, integrability into other devices.