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Proceedings Paper

Electrospun tin oxide nanofibers for gas sensing applications
Author(s): Neliza León; Anamaris Meléndez; Glendalys Figueroa; Idalia Ramos; Nicholas J. Pinto
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Paper Abstract

Tin oxide is a binary semiconductor with a wide band gap (Eg = 3.6 eV at 300 K) and has been used, mostly in the form of thin films, as the active element in gas sensing applications. As a fiber it is expected to have improved sensitivity as the surface-to-volume ratio increases. The authors fabricated undoped tin oxide and antimony-doped tin oxide nanofibers using electrospinning and metallorganic decomposition techniques. The precursor solution for the undoped fibers was based on a tin (IV) chloride and a viscous solution based on poly(ethylene oxide) (PEO). The antimonydoped precursor solution had an additional antimony trichloride solution made from isopropanol to obtain a Sb concentration of 1.5 %. To study the sensitivity of the fibers to gas exposure, both single nanofibers and nanofiber mats were electrospun onto Si/SiO2 wafers. The changes in the nanofiber resistance with exposure and removal of methanol were measured as a function of time and gas concentration. In both configurations, the undoped nanofibers show higher sensitiviy to the presence and removal of methanol. Both the undoped and antimony-doped tin oxide single nanofibers show faster response times than the nanofiber mats. Of all the configurations tested, the antimony-doped single fiber gives more stable and faster response.

Paper Details

Date Published: 16 May 2007
PDF: 8 pages
Proc. SPIE 6591, Nanotechnology III, 65910G (16 May 2007); doi: 10.1117/12.722103
Show Author Affiliations
Neliza León, Univ. of Puerto Rico at Humacao (United States)
Anamaris Meléndez, Univ. of Puerto Rico at Humacao (United States)
Glendalys Figueroa, Univ. of Puerto Rico at Humacao (United States)
Idalia Ramos, Univ. of Puerto Rico at Humacao (United States)
Nicholas J. Pinto, Univ. of Puerto Rico at Humacao (United States)

Published in SPIE Proceedings Vol. 6591:
Nanotechnology III
Fernando Briones, Editor(s)

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