High-yield fabrication of t-Se nanowires via hydrothermal method and their photoconductivity
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Large-scale fabrication of high-purity and uniform trigonal selenium (t-Se) nanowires was obtained by reducing SeO2 with glucose at 160 °C for 24 h. The resulting t-Se nanowires were characterized and confirmed by means of an X-ray diffractometer, scanning electron microscope, transmission electron microscope and energy dispersive X-ray spectroscope. The results indicated that the high yield uniform t-Se nanowires have high degree of crystallinity. The selected area electron diffraction pattern and high-resolution transmission electron microscopy image demonstrate perfect crystallinity with the growth direction of . Owning to quantum size effect, a significant blue shift could be identified in the absorbance spectroscopy of as-prepared products. The photoconductivity of t-Se nanowires with light was also investigated and reached maximum at the wavelength of 575 nm, which might be useful in the fabrication of micro-devices or photo-switches. Contrast experiments showed that surfactant Tween-40 played a crucial role in the formation of nanowires.
Financial support from the National Natural Science Foundation of China (20571001), the Education Department (No. 2006KJ006TD) of Anhui Province and Anhui Provincial Natural Science Foundation (070414185) are appreciated.
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