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Issue 32, 2012
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Self-weaving WO3 nanoflake films with greatly enhanced electrochromic performance

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Abstract

Vertically oriented WO3 nanoflakes woven from nanowires were obtained using a crystal-seed-assisted hydrothermal technique on a glass substrate coated with fluorine-doped tin oxide (FTO). Investigation of the growth process revealed that two types of nanowire, along the (100) and (002) planes, respectively, were formed in the early stages. In the presence of oxalic acid and urea, these nanowires were then interwoven to give a flake-like nanofabric. This process is similar to weaving on a loom, in which the two types of nanowire act as “warp and weft threads” and the oxalic acid and urea act as the “shuttle”. The as-prepared films exhibit tunable transmittance modulation under different voltages, and repeated cycling between the coloration and bleaching states has no deleterious effect on their electrochromic performance after 1000 cycles. A larger optical modulation of 68% at 632.8 nm at a potential of −3.0 V, faster switching speeds of tc(90%) = 9.3 s and tb(90%) = 5.7 s for coloration and bleaching, respectively, and a higher coloration efficiency of 134.4 cm2 C−1 than those previously reported for the electrochromic performances of nanostructured films were achieved for this self-weaving nanoflake film.

Graphical abstract: Self-weaving WO3 nanoflake films with greatly enhanced electrochromic performance

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Publication details

The article was received on 03 May 2012, accepted on 29 Jun 2012 and first published on 03 Jul 2012


Article type: Paper
DOI: 10.1039/C2JM32784H
Citation: J. Mater. Chem., 2012,22, 16633-16639
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    Self-weaving WO3 nanoflake films with greatly enhanced electrochromic performance

    D. Ma, H. Wang, Q. Zhang and Y. Li, J. Mater. Chem., 2012, 22, 16633
    DOI: 10.1039/C2JM32784H

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