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Optical and photoconductive properties of transparent SnO2 nanofibers, made from C22H44O4Sn via electrospinning and metallorganic decomposition, were investigated using Fourier transform infrared and ultraviolet (UV)/visible spectrometry and the two-probe method. Their optical bandgap was determined from their UV absorption edge to be 3.95–4.08 eV. Their conductance responds strongly to UV light for a wavelength of 254 nm: in air its steady-state on-to-off ratios are 1.31–1.56 (rise) and 1.25–1.33 (fall); its 90% rise and fall times are 76–96 and 71–111 s, respectively. In a vacuum of about 10−4 torr, its on-to-off ratios are higher than 35.6 (rise) and 3.4 (fall), respectively, and its 90% rise and fall times are longer than 3×104 s.
fibres, fourier transform spectra, infrared spectra, nanostructured materials, nanotechnology, nanostructurred materials, optical constants, photoconductivity, pyrolysis, semiconductor growth, semiconductor materials, tin compounds, ultraviolet spectra, visible spectra
Wang, Yu; Ramos, Idalia; and Santiago-Aviles, Jorge J., "Optical Bandgap and Photoconductance of Electrospun Tin Oxide Nanofibers" (2007). Departmental Papers (ESE). Paper 315.
Date Posted: 15 January 2008
This document has been peer reviewed.