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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...
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