Multicolor electrochromic ultrathin films based on neutral red and polyoxometalate |
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Authors: | Shuping Liu Guanggang Gao Bingbing Xu |
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Affiliation: | Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun 130024, China |
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Abstract: | Electrochromic ultrathin films composed of the polyoxometalate cluster K10[P2W17O61]·17H2O (P2W17), polyallylamine hydrochloride (PAH) and Neutral Red (NR) were fabricated on quartz, silicon wafer and indium-tin oxide substrates by the layer-by-layer self-assembly method. The multilayer [P2W17/PAH/P2W17/NR]n films were characterized by UV-vis spectroscopy, scanning electron microscopy, cyclic voltammetry and chronoamperometry and in-situ spectral electrochemical measurements, which exhibited suitable response time, high optical contrast and low operation potential. The monolacunary polyoxometalate-based electrochromic film displays adjustable colors and undergoes transitions from deep pink to light purple, then to dark purple-blue over the potential range from +0.2 V to − 1.0 V. Furthermore, two types of data storage using optical changes of the [P2W17/PAH/P2W17/NR]35 film are proposed. The results provide valuable information for exploring applications in tunable-color electrochromic devices and data-storage devices. |
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Keywords: | Electrochromic Polyoxometalate Ultrathin film Layer-by-layer Data storage |
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