Electron Microscopy Study of Binary Nanocolloidal Crystals with ico-AB13 Structure Made of Monodisperse Silica Nanoparticles

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• 作者：Yasuhiro Sakamoto ; Yoshiyuki Kuroda ; Susumu Toko ; Takuji Ikeda ; Toshiyuki Matsui ; Kazuyuki Kuroda
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 10, 2014
• 年：2014
• 卷：118
• 期：27
• 页码：15004-15010
• 全文大小：524K
• ISSN：1932-7455

文摘

Binary nanocolloidal crystals (BNCCs) made of two different nanoparticles are a promising new class of advanced functional materials with synergetic and collective properties. These materials have been shown to exhibit excellent structural diversity and a wide range of different stoichiometries. In this study, BNCCs with an ico-AB₁₃ structure were prepared as inorganic bulk materials by simple solvent evaporation of silica nanocolloidal aqueous solutions. Systematic analysis of Fourier diffractograms of high-resolution transmission electron microscopy (HRTEM) images shows the reflection conditions of the space group Fm3̅c without any ambiguities, which is indicative of the ico-AB₁₃ structure. Simulated HRTEM images based on the ideal ico-AB₁₃ structure were also calculated under the kinematical scattering approximation. These images showed the characteristic fine structure of the ico-AB₁₃ structure along the high-symmetry axes. The agreement between the observed and simulated HRTEM images indicates the validity of the ideal ico-AB₁₃ model structure. This result shows that HRTEM together with a quantitative image simulation is a versatile method for the characterization of the BNCCs at the nanoscale and can be routinely applied for any nanocolloidal crystals, even for complex structures.