Structural and optical properties of Cu2O nanoparticles formed on Al2O3 substrates using spin coating and thermal treatment

Abstract

Cu2O nanoparticles were grown on Al2O3 substrates by spin coating and thermal treatment. X-ray diffraction patterns, scanning electron microscopy images, X-ray energy dispersive spectroscopy profiles, and high-resolution transmission electron microscopy images showed that Cu2O nanoparticles were formed on Al2O3 substrates. The photoluminescence (PL) peaks at 30 K were attributed to the excitonic peaks corresponding to interband transitions in the Cu2O nanoparticles, and the PL peak at 300 K was related to the optical phonons in the nanoparticles.