Physica B: Condensed Matter, ( ISI ), Volume (3), No (40), Year (2008-1) , Pages (2431-2437)

Title : ( The effect of the post-annealing temperature on the nano-structure and )

Authors: Nasser Shahtahmassebi , , MOHAMMAD REZA R. ALINEJAD , A. Youssefi , M. Shokooh-Saremi ,

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Abstract Nano-crystalline SnO2 particles have been synthesized by sol–gel process using a simple starting hydro-alcoholic solution consisting of SnCl4, 5H2O and citric acid as complexing and ethylene glycol as polymerization agents. The structural properties of the prepared tin oxide nano-powders annealed at different temperatures (300–700 1C) have been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses. The XRD patterns show SnO2-cassiterite phase in the nano-powders, and size of crystals increases by increasing the annealing temperatures. The TEM images show nano-particles as clusters with size in the range of 5–25 nm. Electron diffraction pattern of nano-powders annealed at different temperatures shows a homogeneous distribution of spherical particles due to the effect of ethylene glycol as polymerizing agent in sol–gel process. The optical direct band gap values of SnO2 nano-particles were calculated to be about 4.05–4.11 eV in the temperature range 300–700 1C by optical absorption measurements. These values exibit nearly a 0.5 eV blue shift from that of bulk SnO2 (3.6 eV), which is related to size decrease of the particles and reaching to the quantum confinement limit of nano-particles.

Keywords

, Keywords: Tin oxide; Nano, particle; Sol–gel method; Annealing
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@article{paperid:1015557,
author = {Shahtahmassebi, Nasser and , and R. ALINEJAD, MOHAMMAD REZA and A. Youssefi and M. Shokooh-Saremi},
title = {The effect of the post-annealing temperature on the nano-structure and},
journal = {Physica B: Condensed Matter},
year = {2008},
volume = {3},
number = {40},
month = {January},
issn = {0921-4526},
pages = {2431--2437},
numpages = {6},
keywords = {Keywords: Tin oxide; Nano-particle; Sol–gel method; Annealing temperature},
}

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%0 Journal Article
%T The effect of the post-annealing temperature on the nano-structure and
%A Shahtahmassebi, Nasser
%A ,
%A R. ALINEJAD, MOHAMMAD REZA
%A A. Youssefi
%A M. Shokooh-Saremi
%J Physica B: Condensed Matter
%@ 0921-4526
%D 2008

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