Effect of carrier concentration on the optical band gap of TiO2 nanoparticles
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- 作者：Shamsa Munira ; Syed Mujtaba Shaha ; smschem69@yahoo.com" class="auth_mail" title="E-mail the corresponding author ; Hazrat Hussaina ; Rafaqat Ali khanb
- 关键词：Doping ; Bathochromic shift ; Burstein&ndash ; Moss effect ; Carrier concentration
- 刊名：Materials & Design
- 出版年：2016
- 出版时间：15 February 2016
- 年：2016
- 卷：92
- 期：Complete
- 页码：64-72
- 全文大小：1511 K
文摘
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TiO2 nanoparticles were doped with Cu, Cr and Ni and the effect of dopant concentration was evaluated.
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Direct band gap was assigned to the synthesized TiO2 and doped TiO2.
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Absorption spectroscopy displayed a band gap narrowing up to 2.9, 3.4 and 3.6 eV for Cu, Ni and Cr doped samples.
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Induction of Burstein–Moss effect at higher dopant levels is observed resulting in blue shift of absorption edge.
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XPS results established that carrier concentration determines the nature and chemical environment of the doped metal ions.
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Reduction of Ti4 + to Ti3 + is reported as a result of incorporation of foreign ions.