Abstract
Randomly oriented orthorhombic tin oxide nanocrystals formed faceted complex structures like nanocubes, nanopyramids, hexagonal discs, etc. SnCl2·2H2O was used as a precursor in this ethanol−water aided solvothermal synthesis. The growth and self-assembly of primary nanocrystals into complex structures were thought to be aided by thermodynamic energy, viscosity, surface tension, and also by hydrogen bonding, which supported long-range ordering of the nanocrystals. The optical absorbance spectra revealed that the band gap for structured orthorhombic tin oxides is widened from its reported bulk value. The experimentally obtained values of the optical band gap are tallied with the values obtained by using an established theoretical model (Effective Mass Approximation) concerning the interrelation of size and the optical band gap of nanocrystals.
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