Pal, Ayan2020-08-032023-10-192020-08-032023-10-192019ROLL NO.146122026https://gyan.iitg.ac.in/handle/123456789/1465Supervisor: Arun ChattopadhyayPresent thesis addresses that apart from being a good optical material, carbon dots (Cdots) can be highly crystalline in nature, turning them into a quality nano material for energy storage and conversion. The aim of this thesis is to pursue detailed investigations on the structural characteristics of Cdots. In this thesis we try to pinpoint on probing the hetero atom doping, which influenced the photophysical property of Cdots through surface modifications and heteroatom induced structural arrangement. In spite of being an emerging class of “nano light” the origin of optical properties of Cdots is still not well explained. That is the motivation of this thesis to investigate detailed photophysical properties of Cdots and implementation of the same for sensing application. Besides, exact geometry inside Cdot nano structure is not known. Structural randomness restricts utilization of this state-of-the-art environment friendly and easy-to-synthesize nano material in the field of organic electronics, photovoltaics, energy storage and conversion. Present thesis also imparts light on preparing highly crystalline Cdots. Origin of the observed structural characteristics were investigated in details and were finally utilized for efficient energy conversion and energy storage applications.enCHEMISTRYThesis