Abstract
Nanostructured tungsten oxide (WO3) particles were prepared in aqueous solution by mimicking biomineralization. Precursor WO3 · H2O particles were generated by ageing a 60°C (NH4)10W12O41 · 5H2O solution containing gelatin. This was followed by heating to 600°C in air for thermal conversion to WO3. The addition of gelatin led to the formation of layered structures consisting of WO3 · H2O platy particles, which contained segmented, block-like nanoscale units. The macroscopic layered structure was preserved after thermal conversion to WO3, while the morphology of the block-like units changed to orthogonally crossed nanorods.
Highlights
Tungsten oxide (WO3) has been used in various devices such as photoelectrodes [1,2,3], electrochromic materials [1,4,5] and gas sensors [6,7,8]
H2O layered plates to [001]-oriented WO3. These results suggested 10 that the WO3 layered structures prepared with gelatin have highly ordered nanostructures consisting of oriented inorganic nanoscale units like biominerals such as nacres, sea urchin spines and eggshells [9,10,11,12,13,14,15,16,17]
WO3 particles with highly ordered nanostructures were prepared via a biomimetic process involving the biological polymer gelatin
Summary
Tungsten oxide (WO3) has been used in various devices such as photoelectrodes [1,2,3], electrochromic materials [1,4,5] and gas sensors [6,7,8]. Various nanostructured inorganic materials have been prepared by novel solution techniques that mimicked biomineralization Natural biominerals such as nacres, sea urchin spines and eggshells consist of oriented inorganic units less than 50 nm in size, and nanoscale spaces containing biological polymers like chitin, chitosan and gelatin [9,10,11,12,13,14,15,16,17]. Such highly ordered nanostructures are formed by self-assembly and selforganization via interactions between the inorganic crystals and the biological polymers.
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