Preparation and Application of Multiple‐Component‐Doped Keggin Polyoxometalate Microtubes—Towards a Component‐Tunable Hollow Structure

Abstract

In this paper, the preparation of ascorbic acid (AA)‐doped polyoxometalate (SiW₁₂‐AA) microtubes is described. The SiW₁₂‐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 SiW₁₂‐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 SiW₁₂‐AA microtubes to give silver NPs immobilized on polyoxometalate microtubes (Ag@SiW₁₂).