Structure and luminescence of sol-gel synthesized anatase nanoparticles

被引：15
|
作者：
Hormann, U. [1 ]
Kaiser, U. [1 ]
Albrecht, M. [2 ]
Geserick, J. [3 ]
Husing, N. [3 ]
机构：
[1] Univ Ulm, Electron Microscopy Grp Mat Sci, Albert Einstein Allee 11, D-89081 Ulm, Germany
[2] Leibniz inst Crystal Growth, D-12489 Berlin, Germany
[3] Univ Ulm, Inst Inorgan Chem, D-89081 Ulm, Germany
来源：
16TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS | 2010年 / 209卷
关键词：
D O I：
10.1088/1742-6596/209/1/012039
中图分类号：
TH742 [显微镜];
学科分类号：
摘要：
Two samples of mesoporous anatase nanoparticles, prepared by the sol-gel method, were characterised by Cs-corrected high resolution transmission electron microscopy (HRTEM), X-ray powder diffraction (XRD) and Raman spectroscopy Statistical evaluation of TEM data showed an average diameter of these crystallites of 8 8 nm and 11 1 nm, respectively Optical spectroscopy by cathodoluminescence (CL) in a scanning electron microscope (SEM) showed free exciton transitions related to the direct and the indirect band gap of anatase TiO2 From the analysis of the excited states of the free excitons an exciton binding energy of 10 meV and a Bohr radius of 2 35 nm is obtained The small Bohr radius could explain the absence of quantum confinement in the particles presented in this study
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页数：6
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