Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 15, Pages 7218-7224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp110129f
Keywords
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Funding
- National Research Foundation [NRF2010-0009545, NRF2010-0015975]
- Korean Government (MOEHRD) [KRF-2008-005-J00501]
- National Research Foundation of Korea [2009-0071935, 2009-0094037] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This work reports the H2S gas-sensing properties of ZnO nanorod bundles and an investigation of their gas sensing mechanism. A one-dimensional ZnO nanostructure was synthesized using the hydrothermal method; scanning electron microscopy (SEM); and X-ray diffraction (XRD) spectra confirmed that the structures. A furnace type gas sensing properties in air containing dilute H2S gas (50 ppm) at sensing temperatures T-s <= 500 degrees C. The response of ZnO nanorod-bundle sensors to H2S gas increased with T-s; this trend may be due to chemical reaction of nanorods with gas molecules. X-ray photoelectron spectroscopy results indicated that the sensing mechanism of the ZnO nanorod-bundle sensor was explained by both the well-known surface reaction between H2S and adsorbed oxygen on ZnO, and the formation of zinc-sulfur bonding in ZnO nanorods, which becomes a dominant sensing mechanism at high T-s above 300 degrees C.
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