Crystallizing Sub 10 nm Covalent Organic Framework Thin Films via Interfacial–Residual Concomitance
| Autor: | Ashok Kumar Mahato, Kaushik Dey, Rahul Banerjee, Himadri Sekhar Sasmal, Indrajit Giri, Ratheesh K. Vijayaraghavan, Mercedes Linares-Moreau, Carlos Carbonell, E. Bhoje Gowd, Paolo Falcaro, Saikat Bag |
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| Rok vydání: | 2021 |
| Předmět: |
Silicon
010405 organic chemistry Chemistry Borosilicate glass chemistry.chemical_element General Chemistry Conductivity 010402 general chemistry 01 natural sciences Biochemistry eye diseases Catalysis 0104 chemical sciences law.invention Crystallinity Colloid and Surface Chemistry Chemical engineering law sense organs Wetting Thin film Crystallization Covalent organic framework |
| Popis: | Synthesis of covalent organic framework (COF) thin films on different supports with high crystallinity and porosity is crucial for their potential applications. We have designed a new synchronized methodology, Residual Crystallization (RC), to synthesize sub 10 nm COF thin films. These residual crystallized COF thin films showcase high surface area, crystallinity, and conductivity at room temperature. We have used interfacial crystallization (IC) as a ratecontrolling tool for simultaneous residual crystallization. We have also diversified the methodology of residual crystallization by utilizing two different crystallization pathways: fiber-to-film (F–F) and sphere-to-film (S–F). In both cases, we could obtain continuous COF thin films with high crystallinity and porosity grown on various substrates (the highest surface area of TpAzo COF thin film being 2093 m2g-1). Precise control over the crystallization allows the synthesis of macroscopic defect-free sub 10 nm COF thin films with a minimum thickness of ~1.8 nm. We have synthesized two COF thin films (TpAzo and TpDPP) using fiber-to-film (F–F) and sphere-to-film (S–F) pathways on different supports like borosilicate glass, FTO, silicon, Cu, metal and ITO. Also, we have investigated the mechanism of the growth of these thin films on various substrates with different wettability. Further, hydrophilic support (glass) was used to grow the thin films in-situ for four-probe system device fabrication. All residual crystallized COF thin films exhibit outstanding conductivity values. We could obtain a conductivity of 0.037 mScm-1 for the TpAzo film synthesized by F-F residual crystallization. |
| Databáze: | OpenAIRE |
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