The effect of the post-annealing temperature on the nano-structure and energy band gap of SnO2 semiconducting oxide nano-particles synthesized by polymerizing-complexing sol-gel method

被引：145

作者：

Bagheri-Mohagheghi, M-M ^{[1
,2
]}

Shahtahmasebi, N. ^{[1
]}

Alinejad, M. R. ^{[1
]}

Yousseffi, A. ^{[3
]}

Shokooh-Saremi, M. ^{[4
]}

机构：

[1] Ferdowsi Univ Mashhad, Sch Basic Sci, Dept Phys, Mashhad, Iran

[2] Damghan Univ Basic Sci, Dept Phys, Damghan, Iran

[3] Par e Tavoos Res Inst, Nanotechnol Lab, Mashhad, Iran

[4] Univ Connecticut, Dept Elect & Comp Engn, Storrs, CT 06269 USA

来源：

PHYSICA B-CONDENSED MATTER | 2008年 / 403卷 / 13-16期

关键词：

tin oxide; nano-particle; sol-gel method; annealing temperature;

D O I：

10.1016/j.physb.2008.01.004

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Nano-crystalline SnO2 particles have been synthesized by sol-gel process using a simple starting hydro-alcoholic solution consisting of SnCl4, 5H(2)O 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 degrees C) 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 degrees C 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. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：2431 / 2437

页数：7

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