Design and Fabrication of Surface Anchored Organic Assemblies

Abstract

Herein, the work carried out in this thesis has focused on developing surface organic assemblies: (Chapter-1) fabrication approaches of surface aromatic di-imide polymers via step-by-step copolymerization, and (Chapter-2) Design and synthesis approach of 2 dimensional (2D) imine linked surface covalent organic frameworks.

(Chapter-1): A controlled on surface assembly of 1-dimensional aromatic donor-acceptor di-imide polymer chains have been grown to investigate the structure-property correlations in solid state. In an effort to facilitate the controlled incorporation of donor–acceptor moieties into a system, here layer-by-layer (LBL) fabrication technique is employed to synthesize discrete molecular layers of donor and acceptor, on top of another. Further, the organic thin films have been characterized by UV-Vis, SEM, ATR, AFM studies. Furthermore, the systems have been modified with different length of donor molecules to incorporate the π-π interactions between donor and acceptor molecules which may facilitate the charge transfer. Owing to the presence of predictable and well-organized assembly of donor-acceptor molecules, these organic thin films can be potentially useful for exhibiting suitable electronic properties.

(Chapter-2): An on surface fabrication technique of 2 dimensional (2D) imine linked Covalent Organic Framework. Herein, we have employed a bottom-up strategy for anchoring COF microcrystallites on functional substrates as thin film under ambient condition. Further, the powder COFs and the COF thin films have been characterized by XRD, ATR, FESEM, UV-Vis studies. We expect this ease of fabrication will facilitate the surface covalent organic framework thin films application for the development of advanced sensors or electronic devices.