Nano Archive

Ultrasensitive chemiresistors based on electrospun TiO2 nanofibers

Kim, Il-Doo and Rothschild, Avner and Lee, Byong Hong and Kim, Dong Young and Jo, Seong Mu and Tuller, Harry L. (2006) Ultrasensitive chemiresistors based on electrospun TiO2 nanofibers. NANO LETTERS, 6 (9). pp. 2009-2013.

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Nanostructured semiconducting metal oxides and particularly single nanowire devices offer exceptional gas sensitivity but at the expense of statistical variations and excessive noise levels. In this study TiO2/poly( vinyl acetate) composite nanofiber mats were directly electrospun onto interdigitated Pt electrode arrays, hot pressed at 120 degrees C, and calcined at 450 degrees C. This resulted in a novel multiple nanowire network composed of sheaths of 200-500 nm diameter cores filled with readily gas accessible similar to 10 nm thick single-crystal anatase fibrils. TiO2 nanofiber sensors tested for NO2, in dry air, exhibited exceptional sensitivity showing with, for example, a 833% increase in sensor resistance when exposed to 500 ppb NO2 at 300 degrees C, consistent with a detection limit estimated to be well below 1 ppb. Unusual response patterns were observed at high NO2 concentrations (> 12.5 ppm), consistent with n to p inversion of the surface-trap limited conduction facilitated by the high surface-to-volume ratio of this material.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Analytical Science > Nanotechnology for sensing and actuating
ID Code:3702
Deposited By:Farnush Anwar
Deposited On:22 Jan 2009 13:41
Last Modified:29 Jan 2009 13:31

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