Encapsulation of gold nanoclusters in silica materials via an inverse micelle/sol-gel synthesis

被引:68
作者
Martino, A
Yamanaka, SA
Kawola, JS
Loy, DA
机构
[1] TEXAS INSTRUMENTS INC, DALLAS, TX 75265 USA
[2] SANDIA NATL LABS, PROPERTIES ORGAN MAT DEPT, ALBUQUERQUE, NM 87185 USA
关键词
D O I
10.1021/cm9604625
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanometer-sized gold particles were encapsulated in the micropores of xerogels and aerogels. The synthesis involves the sequential reduction of a gold salt followed by sol-gel processing in an inverse micelle solution. The inverse micelle solution solubilizes the metal salt and provides a microreactor for the nucleation, growth, and stabilization of the nanometer-sized clusters. Hydrolysis and condensation of an added siloxane precursor produces a wet gel embedding the particles. Characterization of the particle size and composition and the particle growth process was completed with transmission electron microscopy (TEM), electron diffraction, and UV-visible absorption spectrometry. Characterization of the gel surface areas was completed with N-2 porosimetry. Material properties determined as a function of the gel precursor (TEOS vs a prehydrolyzed form of TEOS), the water to gel precursor reaction stoichiometry, and surfactant concentration are discussed in terms of the unique solution chemistry occurring in the microheterogeneous inverse micelle solutions.
引用
收藏
页码:423 / 429
页数:7
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