Structural, optical and gas sensing properties of pure and Mn-doped In₂O₃ nanoparticles

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• 作者：Kanica Anand ; Jasmeet Kaur ; Ravi Chand Singh ; Rengasamy Thangaraj ; ^{rthangaraj@rediffmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：In2O3 ; Doping ; Sensor response ; Optical
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：42
• 期：9
• 页码：10957-10966
• 全文大小：7905 K

文摘

Pure and (1%, 3% and 5% Mn-doped In₂O₃ nanoparticles have been synthesised by co-precipitation. XRD pattern suggests the cubic bixbyte phase for the In₂O₃ nanoparticles and the decrease in lattice constant with Mn-doping confirms the incorporation of Mn³⁺in the In₂O₃ nanoparticles. Transmission electron microscopy also reveals the presence of bixbyte phase only. Red shift in the band gap due to Mn doping is observed, the hump in the reflectance spectra corresponding to ⁵E_g→$\to$⁵T_2g transitions confirms the incorporation of Mn³⁺ in the In₂O₃ nanoparticles. This is also corroborated by Raman absorption in the range of 600–700 nm. The 3% Mn-doped In₂O₃ nanoparticles exhibit relatively high photoluminescence intensity due to large oxygen vacancies/defects and possess relatively higher sensor response towards methanol, ethanol, acetone, ammonia vapours and LPG, as higher oxygen vacancies/defects provide enhanced adsorption sites for target gas.