S-Space College of Medicine/School of Medicine (의과대학/대학원) Otorhinolaryngology (이비인후과학전공) Journal Papers (저널논문_이비인후과학전공)
Ultrasensitive chemiresistors based on electrospun TiO2 nanofibers
- Kim, Il-Doo; Rothschild, Avner; Lee, Byong Hong; Kim, Dong Young; Jo, Seong Mu; Tuller, Harry L.
- Issue Date
- American Chemical Society
- Nano Lett. 2006, 6, 2009
- Crystallization/*methods; Electric Impedance; Electrochemistry/*instrumentation/methods; Equipment Design; Equipment Failure Analysis; Materials Testing; Nanotubes/*chemistry/ultrastructure; Nitric Oxide/*analysis/*chemistry; Rotation; Titanium/*chemistry; *Transducers
- 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 approximately 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.
- 1530-6984 (Print)
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