Abstract
ZnO nanoparticles were successfully synthesized using cassava starch (tapioca) as a chelating agent. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) analyses revealed that the synthesized nanoparticles were in the form of ZnO with no impurities present. The estimated average crystallite size, determined from Rietveld refined XRD patterns, increased from 20 to 41 nm as calcination temperature increased from 500 to 700 °C. Transmission electron microscopy (TEM) images showed ZnO nanoparticles with an average size ranging from 30 nm (500 °C) to 100 nm (700 °C). The optical band gap was affected by heat treatment, and the lowest value was found at 500 °C (3.16 eV). Photoluminescence spectroscopy (PL) results show that all synthesized ZnO nanoparticles presented emission in the blue region, which was attributed to oxygen vacancies and optimized by calcination at 700 °C.
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