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In this paper, TiO 2 /ZrO 2 coaxial core–shell composite nanotubes were synthesized with the anodic aluminum oxide (AAO) template by a new “two-step method”: Zr(NO 3 ) 4 sol was first deposited on the nanochannels of the AAO template to form a layer of ZrO 2 nanotubes, and the TiO 2 /ZrO 2 composite nanotubes were obtained after TiF 4 ...
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