Raman spectroscopic study of ZnO/NiO nanocomposites based on spatial correlation model.

Sarang Dev G,Vikas Sharma,Vidushi Singh Baghel,Atsuko Nagataki,Ashish Singh,Neeti Tripathi,Masatoshi Yanagida

doi:10.1039/c9ra04555d

Abstract

The effect of nickel concentration has been investigated in ZnO/NiO nanocomposites synthesized using the co-precipitation method. The X-ray diffraction and TEM measurements confirm the distinct phase of NiO in the ZnO/NiO samples. Furthermore, the Raman study shows the sharp modes at 99 cm−1 and 438 cm−1 corresponding to E(low)2, E(high)2 of hexagonal wurtzite ZnO structure and, 1080 cm−1 associated to the two-phonon (2P) mode of NiO, respectively. We also compared the effect of Ni concentration on the formation of ZnO/NiO by analyzing Ehigh2 Raman mode of ZnO with the help of spatial correlation model. The correlation lengths, broadening and asymmetry ratio obtained from the fitting showed good agreement with the experimental results.

Highlights

Over the years, zinc oxide (ZnO) has attracted tremendous interest in the eld of photovoltaics, photocatalysis, supercapacitor and spintronics applications.[1,2] It is well established that the structural, optical, and electrical properties can be modi ed by intentional doping of the metal ions into the ZnO host matrix
We investigated the structural evolution of ZnO/NiO nanocomposite at varying Ni concentrations
There is a signi cant increase in the crystallite size, when the NiO is introduced into the ZnO sample

Summary

Introduction

Zinc oxide (ZnO) has attracted tremendous interest in the eld of photovoltaics, photocatalysis, supercapacitor and spintronics applications.[1,2] It is well established that the structural, optical, and electrical properties can be modi ed by intentional doping of the metal ions into the ZnO host matrix. There is a signi cant increase in the crystallite size, when the NiO is introduced into the ZnO sample.

Results

Conclusion