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      Controllable Electrochromic Polyamide Film and Device Produced by Facile Ultrasonic Spray-coating

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          Abstract

          Thermally stable TPA-OMe polyamide films with high transmittance modulation in response to applied potential are formed by facile ultrasonic spray-coating. Four processing conditions (Film A, Film B, Film C and Film D) through tuning both solution concentrations and deposition temperatures can be utilized for the formation of wet and dry deposited films with two film thickness intervals. The electrochromic results show that the dry deposited rough films at higher deposition temperature generally reveal a faster electrochromic response, lower charge requirements (Q) and less conspicuous color changes (smaller optical density change (ΔOD) and lightness change (ΔL*)) during the oxidation process as compared to the wet deposited smooth films at lower deposition temperature. Moreover, thicker electrochromic films from increased solution concentration exhibit more obvious changes between coloration and bleaching transition. All these four polyamide films display colorless-to-turquoise electrochromic switching with good redox stability. The large scale patterned electrochromic film and its application for assembled device (10 × 10 cm 2 in size) are also produced and reversibly operated for color changes. These represent a major solution-processing technique produced by ultrasonic spray-coating method towards scalable and cost-effective production, allowing more freedoms to facilitate the designed electrochromic devices as required.

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          Color control in pi-conjugated organic polymers for use in electrochromic devices.

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            Electrochromic organic and polymeric materials for display applications

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              Electrochromics for smart windows: Oxide-based thin films and devices

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                Author and article information

                Contributors
                gsliou@ntu.edu.tw
                clliu@ncu.edu.tw
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                20 September 2017
                20 September 2017
                2017
                : 7
                : 11982
                Affiliations
                [1 ]ISNI 0000 0004 0546 0241, GRID grid.19188.39, Institute of Polymer Science and Engineering, National Taiwan University, ; Taipei, 10617 Taiwan
                [2 ]ISNI 0000 0004 0532 3167, GRID grid.37589.30, Department of Chemical and Materials Engineering, National Central University, ; Taoyuan, 32001 Taiwan
                Author information
                http://orcid.org/0000-0003-3725-3768
                http://orcid.org/0000-0002-8778-5386
                Article
                11862
                10.1038/s41598-017-11862-1
                5607338
                28931845
                ba753f6d-f581-4036-9a38-f7af1c189751
                © The Author(s) 2017

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 2 March 2017
                : 29 August 2017
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