Abstract
Covalent organic frameworks (COFs) with reversible redox units and a conjugated molecular skeleton possess novel photoelectrochemical properties. In this work, tris(4-aminophenyl)amine and 4,4-biphenyldiformaldehyde were chosen to synthesize TABP-COF electrochromic film with triphenylamine (TPA) active unit by a solvothermal method in a Teflon-lined reactor. The growth process and reaction time optimization of the TABP-COF were studied. TABP-COF shows a self-assembly growth process from an array of nanosheets to nanospheres. Owing to the redox characteristics of TPA, the TABP-COF film exhibits reversible electrochromic behavior. With a solvothermal reaction time of 72 h, the TABP-COF-3 film exhibits the best electrochromic properties, including contrast of 0.483 and response time of 7.3 s/13.6 s. Considering the abundance of redox-active units that can be chosen, COF materials with different redox units and color changes can be designed for a variety of applications in the field of electrochromic materials.
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Acknowledgments
The authors are grateful for the financial support provided by the National Natural Science Foundation of China (52073227) and Shaanxi Province Technological Innovation Guidance Special (2021QFY04-01) and for technical support provided by the Analytical Instrumentation Center of XUST.
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Xiong, S., Zhang, Y., Zhang, W. et al. Solvothermal Synthesis and Growth of Covalent Organic Framework Electrochromic Film with Triphenylamine Active Unit. J. Electron. Mater. 53, 2656–2665 (2024). https://doi.org/10.1007/s11664-024-10937-w
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DOI: https://doi.org/10.1007/s11664-024-10937-w