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Letter

A Gradient Microarray Electronic Nose Based on Percolating SnO₂ Nanowire Sensing Elements

Supporting Info

Victor V. Sysoev,*^† Joachim Goschnick,*^‡ Thomas Schneider,^‡ Evghenii Strelcov,^§ and Andrei Kolmakov*^§

Department of Physics, Saratov State Technical University, Saratov 410054, Russia, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, Karlsruhe 76021, Germany, and Southern Illinois University, Carbondale, Illinois 62901-4401

Nano Lett., 2007, 7 (10), pp 3182–3188

DOI: 10.1021/nl071815+

Publication Date (Web): October 10, 2007

Corresponding authors. E-mail: vsysoev@sstu.ru (V.V.S.); Achim.Goschnick@imt.fzk.de (J.G.); akolmakov@physics.siu.edu (A.K.).

†

Saratov State Technical University.

‡

Forschungszentrum Karlsruhe.

Southern Illinois University.

Abstract

Fabrication, characterization, and tests of the practical gradient microarray electronic nose with SnO₂ nanowire gas-sensing elements are reported. This novel device has demonstrated an excellent performance as a gas sensor and e-nose system capable of promptly detecting and reliably discriminating between several reducing gases in air at a ppb level of concentration. It has been found that, in addition to the temperature gradient across the nanowire layer, the density and morphological inhomogeneities of nanowire mats define the discriminating power of the electronic nose.

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