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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
Yu Wang, Idalia Ramos, and Jorge J. Santiago-Aviles, "Optical Bandgap and Photoconductance of Electrospun Tin Oxide Nanofibers", . November 2007.
Date Posted: 15 January 2008
This document has been peer reviewed.