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Abstract
The electrochromic (EC) property ofWO3 nanoparticles grown on vertically self-aligned ZnO nanorods(ZNRs) is reported. An electrochromic character display based onWO3 nanoparticle-modified ZnO nanorod arrays on a flexible substrate has beenfabricated and demonstrated. The ZNRs were first synthesized on ZnO-seed-coatedIn2O3:Sn (ITO)glass (1 cm2 cell) and polyethylene terephthalate (PET) (4 cm2 cell) substrates by a low temperature hydrothermal method, and then amorphousWO3 nanoparticles were grown directly on the surface of the ZNRs by the pulsed laser deposition(PLD) method. The ZNR-based EC device shows high transparence, good electrochromicstability and fast switching speed (4.2 and 4 s for coloration and bleaching, respectively, for a1 cm2 cell). The good performance of the ZNR electrode-based EC display can be attributed tothe large surface area, high crystallinity and good electron transport properties of the ZNRarrays. Its high contrast, fast switching, good memory and flexible characteristics indicateit is a promising candidate for flexible electrochromic displays or electronic paper.
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