Decoration of ZnO Nanorods with Coral Reefs like NiO Nanostructures by the Hydrothermal Growth Method and Their Luminescence Study

Abstract

Composite nanostructures of coral reefs like p-type NiO/n-type ZnO were synthesized on fluorine-doped tin oxide glass substrates by hydrothermal growth. Structural characterization was performed by field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray diffraction techniques. This investigation shows that the adopted synthesis leads to high crystalline quality nanostructures. The morphological study shows that the coral reefs like nanostructures are densely packed on the ZnO nanorods. Cathodoluminescence (CL) spectra for the synthesized composite nanostructures are dominated mainly by a broad interstitial defect related luminescence centered at ~630 nm. Spatially resolved CL images reveal that the luminescence of the decorated ZnO nanostructures is enhanced by the presence of the NiO.

Structural, optical and electronic structure studies of Al doped ZnO thin films

“…However, III-nitride films are quite expensive and difficult to grow, so, alternate materials are required [8]. As, the band structure and optical properties of ZnO are quite similar to leading III-nitride semiconductor GaN, so, ZnO has emerged as a potential replacement for GaN [9]. Also, the exciton binding energy of ZnO (60 meV) is much larger than GaN (25 meV) [10].…”

Influence of ammonia concentration on the microstructure, electrical and raman properties of low temperature chemical bath deposited ZnO nanorods

“…A Zn salt dissociates to produce Zn 2+ ion, the only cation required for building up ZnO nanorods. The essential equations describing the ZnO nanorods growth under solution method are [19,20]:…”

Photochemical Decoration of Metal and Metal-Oxide Nanoparticles on Highly Oriented SnO2Nanorod Films for Improved Hybrid Gas Sensors and Photo-Detectors

“…NiO decorated samples showed small particles from 50 nm to 100 nm and even smaller particles close to 5 nm that accumulate each other in a coral reef like morphology characteristic of NiO. 19 The XRD characterization of the SnO 2 nanorods film was carried out from 15 • to 85 • on the 2 scale Fig. 2a, all the peaks in the X-ray pattern can be well assigned to the rutile crystal structure of SnO 2 .…”