Integrated chemical systems built using nanoporous glass/ceramics as substrates

摘要

It is well known that nanocrystals exhibit great instabilities associated with their high surface energy. In this concern, nanocrystals grown inside the cavities of a porous host become an attractive integrated chemical system (ICS) because certain processes can be performed in a restricted environment where porous act as nanoreactors. In this work we report the synthesis and characterization of nanosized semiconductors SnO_2 and CdS dispersed in porous monoliths. The former was obtained dispersed in porous Vycor glass (PVG) and α-NbPO_5 glass-ceramic, and the latter in PVG. It was observed that the semiconductor crystallites incorporated in porous monoliths are smaller than those obtained for free precursors decompositions.