Substrate Specific Crystallization of Covalent Organic Framework Thin Films for Catalysis and Virus Deactivation

Mahato, Ashok Kumar (2024) Substrate Specific Crystallization of Covalent Organic Framework Thin Films for Catalysis and Virus Deactivation. PhD thesis, Indian Institute of Science Education and Research Kolkata.

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Abstract

Thin films with desirable properties (magnetic properties, conductivity, film architecture, stability and functional backbone) are industrially applicable in optoelectronics, thin-film coating, solar cells, energy storage devices, semiconductor devices, packaging and separation applications. Thin films are mostly fabricated from various functional polymers, organic molecules, metals, metal oxides, ceramics and various hybrid materials. However, industrial applications require the thin films grown on a supporting membrane or a particular substrate for their applications. Separation applications mostly require the polymer thin films fabricated on porous polymer or metal based supporting membranes. The metals and metal oxides thin films are deposited on a conducting substrate as current collector for energy storage applications. Semiconducting thin films are grown on mostly silicon and glass substrates for transistor applications. Hence, discerning the substrate compatibility with the thin films and with the growth process, is of utmost importance. The emerging covalent organic framework (COF) thin films have become versatile applicable in separations, energy storage and optoelectronic devices due to their tuneable properties, defined pore channels and variable functional backbone. However, the scope and compatibility of substrates with the thin films and with the growth conditions are not well explored. In chapter-II, we have introduced a new synthesis methodology to fabricate COF thin films on various non-biological substrates (metal, metal oxides, glass, silicon, ITO and FTO) and abled to find out the appropriate substrates for a particular COF. In chapter-III, we have utilized interfacial crystallization process to grow COF membranes on biological substrates like peptide-based assemblies. The fragile peptide-based assemblies are well stabilized inside the COF membrane backbone without compromising the catalytic ability. Henec, we abled to perform the catalysis in nonaqueous media where the bare peptide assembly is unable to perform the catalysis. We have synthesized COF thin film in presence of a metal oxide nanoparticle, which we have discussed in chapter-IV. The newly developed method is utilized to embed the nanoparticles precisely on the thin film. The nanoparticle embedded COF thin film is highly efficient in deactivating H1N1 virus.

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