Abstract
A novel and facile chelating-template route for encapsulation of nanosized LaCoO3 into mesoporous silica has been investigated. An amphipathic triprotic acid, which has capability to prepare perovskite LaCoO3 powder through Pechini-type method, directs the construction of silica host and thereby fabricates LaCoO3/mesoporous silica composites. Powder X-ray diffraction and X-ray photoelectron spectroscopy analyses were undertaken to determine the formation of the perovskite crystalline phase. Electron microscope and nitrogen adsorption–desorption analyses were carried out to elucidate the structural features of the host–guest composites. It was demonstrated that ultrafine guest LaCoO3 nanoparticles with perovskite rhombohedral phase were formed after calcination, and the host silica skeleton remained short-range ordered mesoporous feature after implantation. This study therefore presents a potential simple approach to encapsulating well-dispersed composite metal oxide in mesoporous silica.
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