| Autor: |
Humphrey NJ; Department of Chemistry, University of California, Irvine, California 92697-2025, United States., Choi EJ; Department of Chemistry, University of California, Irvine, California 92697-2025, United States., Drago NP; Department of Chemistry, University of California, Irvine, California 92697-2025, United States., Hemminger JC; Department of Chemistry, University of California, Irvine, California 92697-2025, United States., Penner RM; Department of Chemistry, University of California, Irvine, California 92697-2025, United States. |
| Abstrakt: |
A single platinum nanowire (PtNW) chemiresistive sensor for ethylene gas is reported. In this application, the PtNW performs three functions: (1) Joule self-heating to a specified temperature, (2) in situ resistance-based temperature measurement, and (3) detection of ethylene in air as a resistance change. Ethylene gas in air is detected as a reduction in nanowire resistance by up to 4.5% for concentrations ranging from 1 to 30 ppm in an optimum NW temperature range from 630 to 660 K. This response is rapid (30-100 s), reversible, and reproducible for repetitive ethylene pulses. A threefold increase in signal amplitude is observed as the NW thickness is reduced from 60 to 20 nm, commensurate with a signal transduction mechanism involving surface electron scattering. |
