Sub-2 nm SnO{sub 2} nanocrystals: A reduction/oxidation chemical reaction synthesis and optical properties

Journal Article · Mon Nov 03 00:00:00 EST 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.12.015· OSTI ID:21143983

Hui, Zhang; Ning, Du; Bindi, Chen; Tianfeng, Cui ^[1]

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1. State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)

A simple reduction/oxidation chemical solution approach at room temperature has been developed to synthesize ultrafine SnO{sub 2} nanocrystals, in which NaBH{sub 4} 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 SnO{sub 2} 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 SnO{sub 2} nanocrystals with the size below 2 nm have been fabricated at room temperature. The band gap of the ultrafine SnO{sub 2} nanocrystals is about 4.1 eV, exhibiting 0.5 eV blue shift from that of the bulk SnO{sub 2} (3.6 eV). Furthermore, the mechanism for the reduction/oxidation chemical reaction synthesis of the ultrafine SnO{sub 2} nanocrystals has been preliminary presented.

• OSTI ID: 21143983
• Journal Information: Materials Research Bulletin, Vol. 43, Issue 11; Other Information: DOI: 10.1016/j.materresbull.2007.12.015; PII: S0025-5408(07)00551-X; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ALCOHOLS
AMMONIA
BORON HYDRIDES
CALORIMETRY
EV RANGE 01-10
MORPHOLOGY
NANOSTRUCTURES
OPTICAL PROPERTIES
OXIDATION
REDUCING AGENTS
REDUCTION
SEMICONDUCTOR MATERIALS
SODIUM HYDROXIDES
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
THERMAL GRAVIMETRIC ANALYSIS
TIN OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY