Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)
- 2012.08a
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- Pages.222-222
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- 2012
Hydrogen and Ethanol Gas Sensing Properties of Mesoporous P-Type CuO
- Choi, Yun-Hyuk (Department of Materials Science and Engineering, Seoul National University) ;
- Han, Hyun-Soo (Department of Materials Science and Engineering, Seoul National University) ;
- Shin, Sun (Department of Materials Science and Engineering, Seoul National University) ;
- Shin, Seong-Sik (Department of Materials Science and Engineering, Seoul National University) ;
- Hong, Kug-Sun (Department of Materials Science and Engineering, Seoul National University)
- Published : 2012.08.20
Abstract
Metal oxide gas sensors based on semiconductor type have attracted a great deal of attention due to their low cost, flexible production and simple usability. However, most works have been focused on n-type oxides, while the characteristics of p-type oxide gas sensors have been barely studied. An investigation on p-type oxides is very important in that the use of them makes possible the novel sensors such as p-n diode and tandem devices. Monoclinic cupric oxide (CuO) is p-type semiconductor with narrow band gap (~1.2 eV). This is composed of abundant, nontoxic elements on earth, and thus low-cost, environment-friendly devices can be realized. However, gas sensing properties of neat CuO were rarely explored and the mechanism still remains unclear. In this work, the neat CuO layers with highly ordered mesoporous structures were prepared by a template-free, one-pot solution-based method using novel ink solutions, formulated with copper formate tetrahydrate, hexylamine and ethyl cellulose. The shear viscosity of the formulated solutions was 5.79 Pa s at a shear rate of 1 s-1. The solutions were coated on SiO2/Si substrates by spin-coating (ink) and calcined for 1 h at the temperature of