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Effect of gel making agent on the morphology and particles sizes of chromium oxide nanostructures

Hassan Karami, Nazanin Namiranian

The paper presents dealswith the effect of poly vinyl alcohol (PVA) amount as gel making agent of sol-gel combustion method on the morphology and the particles sizes of chromium oxide nanostructures (CONS). Chromium nitrate is dissolved in 1:1 water ethanol mixed solvent. Some different amounts are dissolved in the chromium nitrate solution under controlled temperature to make a sol. The solvent of the sol is evaporated under controlled temperature to obtain a high viscous material which called gel. The suitable pyrrolysis temperature of the gel is found by TGA/DTA analysis. The homogenous gel is slowly pyrrolized under 500 ºC by an electrical furnace to obtain a CONS sample. Five different samples are synthesized by using different amounts of PVA. The morphology, particles sizes and the composition of the CONS is characterized by SEM, TEM, XRDandDLS.