Preparation and application of multiple-component-doped keggin polyoxometalate microtubes-towards a component-tunable hollow structure

摘要

In this paper, the preparation of ascorbic acid (AA)-doped polyoxometalate (SiW_(12)-AA) microtubes is described. The SiW_(12)-AA microtubes convert to heteropoly blue microtubes upon exposure to ammonia gas, which is an ammonia-triggered solid-solid redox reaction between AA molecules and polyoxometalates, and can possibly be applied to a chemical sensor for detecting ammonia and volatile organic amines. Furthermore, the SiW _(12)-AA microtubes have been applied to the in situ synthesis of Ag nanoparticles (NPs) through the redox reaction between the AA component and Ag~+ ions occurring on the surfaces of the SiW_(12)-AA microtubes to give silver NPs immobilized on polyoxometalate microtubes (Ag@SiW12).