Investigation of optical properties of SnO2 nanoparticles

被引:105
作者
Chetri, Pawan [1 ]
Choudhury, Amarjyoti [1 ]
机构
[1] Tezpur Univ, Dept Phys, Napaam 784028, Tezpur, India
关键词
TIN OXIDE; OXYGEN VACANCIES; SOLUTION-PHASE; NANOWIRES; MECHANISM; GROWTH; FILMS;
D O I
10.1016/j.physe.2012.11.011
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The preparation of SnO2 nanoparticles with size below 5 nm is achieved using an inexpensive method. The study of structural properties is done by XRD, TEM and FTIR, while the optical properties are observed using UV-Visible and photoluminescence spectroscopy. The prepared SnO2 nanoparticles are annealed at low (200 degrees C), medium (600 degrees C) and high (1000 degrees C) temperature. The UV-Visible spectroscopy shows an interesting band type absorption for high temperature annealed sample. The oxygen vacancies play vital role in the optical properties. These vacancies are the cause of abnormal absorption in high temperature annealed SnO2 nanoparticles. The Urbach energy of all the SnO2 nanoparticles annealed at 200, 600 and 1000 degrees C is also calculated. A high value of Urbach energy for SnO2 nanoparticles annealed at 1000 degrees C is found. The band gap of SnO2 annealed at 1000 degrees C is found to be higher than SnO2 annealed at 200 and 600 degrees C, which has been explained on the basis of Burstein-Moss shift The concentration of charge carrier is calculated using Hall effect and found to be increasing as the annealing temperature increases. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:257 / 263
页数:7
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