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Ultrasensitive chemiresistors based on electrospun TiO2 nanofibers
Cited 539 time in
Web of Science
Cited 567 time in Scopus
- Authors
- Issue Date
- 2006
- Publisher
- American Chemical Society
- Citation
- Nano Lett. 2006, 6, 2009
- Keywords
- 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
- Abstract
- 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.
- ISSN
- 1530-6984 (Print)
- Language
- English
- URI
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=16968017
https://hdl.handle.net/10371/11301
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