Journal
MATERIALS RESEARCH BULLETIN
Volume 43, Issue 11, Pages 3164-3170Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2007.12.015
Keywords
Inorganic compounds; Nanostructuers; Semiconductors; Chemical synthesis; Optical properties
Categories
Funding
- Program for Changjiang Scholar
- ZiJin project Program 973 [2007CB613403]
- Zhejiang Provincial Natural Science Foundation of China [Y407138]
- Ministry of Education of China [20070335014]
- Innovative Team in University and Program for New Century Excellent Talents in University
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A simple reduction/oxidation chemical solution approach at room temperature has been developed to synthesize ultrafine SnO2 nanocrystals, in which NaBH4 is used as a reducing agent instead of mineralizers such as sodium hydroxide, ammonia, and alcohol. The morphology, structure, and optical property of the ultrafine SnO2 nanocrystals have been characterized by high-resolution transmission electron microscopy (HRTEM), X-ray powder diffraction (XRD), differential scanning calorimetry and thermogravimetric analysis (DSC-TGA), X-ray photoelectron spectroscopy (XPS) and UV-vis absorption spectroscopy. It is indicated that the uniform tetragonal ultrafine SnO2 nanocrystals with the size below 2 nm have been fabricated at room temperature. The band gap of the ultrafine SnO2 nanocrystals is about 4.1 eV, exhibiting 0.5 eV blue shift from that of the bulk SnO2 (3.6 eV). Furthermore, the mechanism for the reduction/oxidation chemical reaction synthesis of the ultrafine SnO2 nanocrystals has been preliminary presented. (C) 2008 Elsevier Ltd. All rights reserved.
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