Dendron Stabilized Hybrid nanoparticles: Synthesis: Characterization, and Energy Transfer Studies



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Hybrid organic-inorganic nanoparticles are developed as a new class of material with a wide range of application based on their spectroscopic and electrochemical properties. Designing these materials to fine tune their properties as an energy or charge transfer pair calls for an ease of synthesis to produce stable and tunable nanoparticles. Chapter 2 describes a facile synthesi of a nanoparticle-cored dendrimer with electroactive carbazole dendron conjugated onto the amine surface of a generation three cystamine-core PAMAM dendrimer. The disulfide on the cystamine core of this dendrimer is reduced to produce dendrons that stabilize the AuNPs. Such manner of synthesis avoids the tedious stepwise process of attaching the dendrons to the AuNOs by convergent approach. Spectroscopic and electrochemical properties of this system are reported. Chapter 3 discusses the energy transfer involved between CdSe quantum dots and Au nanoparticles placed proximal to each other. The CdSe quantum dots are stabilized by generational carbazole dendrons which provide a control in the distance of these nanoparticles thereby controlling the donor-acceptor interaction. Quite uniquely, the reduction of the Au3+ ions did not necessitae any external reducing agent. The formation of this hybrid nanoparticle is a one-pot synthesis wherein the reduction of the Au3+ to Au(0) provides a simultaneous cross-linking of the carbazole units which overall affords a formation of a three-component hybrid nanoparticles. Generally, there is a potential in exploring the optimization of this facile synthetic protocol to produce the customized hybrid nanoparticles needed for specific optoelectronic applications.



Hybrid material, Quantum dots, Gold nanoparticles, Dendrons, Carbazole, PAMAM, Dendrimers, Energy transfer