Selective Detection Of NO2 And C2H5OH Using A Co3O4-decorated ...

Selective detection of NO2 and C2H5OH using a Co3O4-decorated ZnO nanowire network sensor†

Chan Woong Na,a Hyung-Sik Woo,a Il-Doo Kimb and Jong-Heun Lee*a Author affiliations

* Corresponding authors

a Department of Materials Science and Engineering, Korea University, Seoul 136-713, Republic of Korea E-mail: [email protected] Fax: +82 2-928 3584 Tel: +82 2-3290 3282

b Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea

Abstract

The selective detection of two different gases, NO2 and C2H5OH, has been achieved using a p-type Co3O4-decorated n-type ZnO nanowire (NW) network sensor. The gas selectivity was explained by the catalytic effect of nanocrystalline Co3O4 and the extension of the electron depletion layer via the formation of p–n junctions.

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