Properties of the electronic density of states in TiO₂ nanoparticles surrounded with aqueous electrolyte

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• 作者：Ilana Abayev ; Arie Zaban ; Vladimir G. Kytin ; Alexey A. Danilin ; Germ¨¤ Garcia-Belmonte and Juan Bisquert
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2007
• 出版时间：May, 2007
• 年：2007
• 卷：11
• 期：5
• 页码：647-653
• 全文大小：296 KB

文摘

Results on the density of sates of nanostructured TiO₂ as a function of particle size and temperature are reported. In TiO₂ nanoparticles with a mean diameter 10 nm, the density of states (DOS) is strongly temperature-dependent, indicating a rearrangement of the bandgap states in which the exponential energy parameter (width of the distribution) increases from 0.080 to 50 ¡ãC. For nanoparticles with mean diameters of 20 and 30 nm the DOS is much closer to an exponential distribution, and is much less sensitive to temperature variations. It is suggested that nanometer confinement has a significant influence on the density of electronic states for 10-nm particles, while band tailing is similar to that occurring in bulk semiconductors for the larger particles.