Facile solution-based synthesis and optical properties of Co₃O₄ nanoparticles at low-temperature

Abstract

Cobalt oxide(Co₃O₄) with different morphologies was achieved by a simple solution-based method. Various parallel experiments show that several experimental parameters, such as the concentrations of NaOH and ethylene glycol(EG), play important roles in the morphological controlling of Co₃O₄ nanoparticles. A lower concentration of NaOH favors quasi-spherical product with a uniform size of about 15 nm, whereas a higher concentration of NaOH generally leads to the formation of nanoplates with wide size distribution. In addition, Co₃O₄ nanorods were also obtained partially by introducing a certain amount of EG. A possible mechanism was proposed for the selective formation of Co₃O₄ with various morphologies. X-Ray diffraction(XRD), infrared(IR) spectrometry, scanning electron microscopy(SEM), transmission electron microscopy(TEM) and UV-Vis spectrometry were used to characterize the samples.

Keywords

Cobalt oxide / Solution-based synthesis / Nanostructure / Optical property

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