Abstract
Zn0.94Cu0.04Cr0.02O nanocrystals were synthesized by co-precipitation method and the effects of annealing at 600 °C and 800 °C under two steps on the structural, optical and morphological properties were investigated systematically. X-ray diffraction pattern showed the secondary phases such as CuO and ZnCr2O4 were found at 600 + 800 °C annealed sample. In addition, I(002)/I(100) ratio became almost equal to 1 at 600 + 800 °C which described the grains with lower surface energy became larger. Chemical composition of the samples was confirmed by energy dispersive X-ray spectra. The variation of absorption peaks between 473 and 556 cm−1 and the shift of absorption frequency towards the lower side by annealing revealed that Zn–O–Zn network is perturbed by the presence of Cu/Cr in its environment. Absorption intensity and blue shift of energy gap were discussed based on size, defects and secondary phase formation. The broad transmittance spectra noticed around visible region illustrated the presence of oxygen related defects and Cu/Cr interstitials. Igreen/Iblue ratio is increased with increase in annealing temperature. The noticed high value of this ratio at 800 °C confirmed the existence more defect related states.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Materials Science: Materials in Electronics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
