Nanocasting a mesoporous palladium replica from a body-centered cubic mesoporous silica and palladium and silver metallic nanoarchitectures within mesoporous channels

Abstract

In this study we employed a facile impregnation method-based on the application of capillary forces, evaporation of solvent and subsequent thermal reduction under H 2 -for the synthesis of various metal/ mesoporous silica composites. Using this approach we obtained highly dispersed Ag nanoparticles within BCC (body-centered cubic) mesoporous silica, interconnected Pd networks within the BCC mesoporous silica, and Ag and Pd nanowires within hexagonal cylindrical channels, all of which we characterized using small-angle X-ray scattering, transmission electron microscopy, N 2 sorption isotherms, and powder X-ray diffraction. Notably, this paper reports the first example of such a Pd metal replica structure prepared through use of the unique BCC-type mesoporous silica as a hard template and subsequent etching in HF (aq) . Finally, we report the successful fabrication of a highly disperse Ag/silica complex prepared through a convenient one-step synthesis.

Sol‐Gel Synthesis of Mesoporous Silica Using a Protein Crystal Template

“…As protein cages can carry inorganic molecules inside them, the cargo molecules could also be incorporated into the silica matrix. Such ordered and fixed active sites can be useful in catalysis and biomedical applications once the pore accessibility is optimized [45,46] …”

“…Such ordered and fixed active sites can be useful in catalysis and biomedical applications once the pore accessibility is optimized. [45,46]…”

Chemical Design of Palladium‐Based Nanoarchitectures for Catalytic Applications

“…In general, the fabrication of well‐ordered mesoporous metals can be performed through two main methods: hard‐templating and soft‐templating methods . In the hard‐templating method, mesoporous silica or mesoporous carbon is commonly used as a hard template.…”

Study on catalytic efficiency of platinum and silver nanoparticles confined in nanosized channels of a 3-D mesostructured silica

“…Among them, mesoporous silica materials, such as MCM-41, SBA-15, KIT-6, are considered as one of the most effective matrices for encapsulating NPs either through chemical interaction between noble metal ions and active sites of functionalized mesoporous silica channels, [30][31][32][33][34][35][36][37][38][39][40][41] or physical adsorption driven by capillary force [42][43][44]. Their tailor-made mesostructure properties, such as high surface area, large total pore volume, and tunable pore size are quite useful to avoid the aggregation drawback of metal NPs.…”