Abstract
Nano crystalline tin dioxide (SnO2) nanostructure was synthesized by co-precipitation technique by varying the pH value of the solution from 7 to 11. The structural, optical properties and surface morphology of the prepared SnO2 nanostructure were studied by X-ray diffraction (XRD), UV–Vis spectroscopy, scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). The XRD study revealed the formation of tetragonal structure. The average crystallite size was found in the range of 15–21 nm. The SEM images showed that samples consist of agglomerated spherical grains. The EDX analysis confirmed the existence of the expected elements, tin and oxygen in the prepared samples. The optical band gap was found to increase with increasing of pH. This blue shift might be due to quantum confinement effect. The PL measurement displayed two emission peaks due to the near band edge emission and surface defects present in the systems.
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