The solution-processable silica/poly(o-methoxyaniline) (SiO 2 /PMOANI) nanocomposites were prepared by chemical oxidative polymerization for the first time. The SiO 2 /PMOANI film electrode was fabricated by spraying nanocomposites dispersion onto ITO conductive glass. A large optical contrast (77.1% at 700 nm), fast switching speed (910 ms for bleaching, 940 ms for coloring), high coloration efficiency, and good durability are achieved by SiO 2 /PMOANI nanocomposite film. And the SiO 2 /PMOANI film was successfully assembled into an all-solidstate electrochromic device. The electrochromic device based on SiO 2 / PMOANI film exhibits large optical modulation, ultrafast switching speed (446 ms for bleaching, 453 ms for coloring), and excellent cycling stability (optical contrast decay of only 4.3% after 1000 cycles). Moreover, the large-area electrochromic display based on SiO 2 / PMOANI film with high-quality pattern was fabricated by spray-coating method using a mask to form patterns. The patterned electrochromic display presents a fast switching speed and large optical modulation. The solution-processable SiO 2 /PMOANI nanocomposites show potential applications for large-area smart windows, energy-efficient displays, and multifunctional electronic devices.
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