期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 3, 页码 1127-1134出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm13696h
关键词
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资金
- National Research Laboratory
- WCU of the Ministry of Education, Science, and Technology of Korea [R32-20026]
Zinc oxide (ZnO) hollow hemisphere (HS) and urchin-like (UL) structures were fabricated and examined for application to a gas sensor. Films of hollow ZnO-HS arrays floating over substrates were synthesized via Zn sputtering onto the template of a polystyrene sphere array followed by oxidation. Growing ZnO nanorods upon HS surfaces via a hydrothermal method formed hollow ZnO-UL structures. The thicknesses of the HS films and the lengths of nanorods in the UL structures were varied to obtain the maximum response to NO gas. Both sensor structures showed a sensing of tens of parts per billion of levels of NO concentrations with good response and gas selectivity. The highest response was realized through the thinness and the open porosity of the structures. The surface depletion determined the sensor response signal for the sensor geometry with the highest response.
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