Synthesis And Properties Of Inorganic Nanocrystals Derived From Colloidal Systems

Abstract:

Colloidal systems offer opportunities for synthesizing a wide variety of morphologies, structure and compositions of inorganic materials, such as oxides, with novel physical and chemical properties. Using examples methods of synthesising and the resulting properties are discussed. Synthesis of TiO2 nanoparticles from a colloidal system as a function of pH followed by crystallization of anatase, rutile and brookite crystal structures are discussed with respect to the critical nuclei size and coalescence [1,2]. As demonstrated for the bismuth titanate family, morphologies can be varied from nanospheres, nanoplates, nanorods, nanowires and nanowires to coalesced chop-sticks, microflowers and microspheres by controlling the colloidal processes that can be used in piezoelectric, sensing or photovoltaic applications[3-6]. It is shown that colloidal CdSe nanocrystals attain a magic closed-shell structure at a radius of 1.8 nm, the growth rate at that nano-size deviate from the classical growth theory. Using thermodynamic and kinetic approach, we have explored methods for making truly single or multiple monosized nano-crystals of CdSe from colloidal systems [7-9].

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