Growth of Different Zinc Oxide Nanostructures for Hydrogen Gas Sensing

Abstract

This work describes the synthesis of various Zinc Oxide (ZnO) nanostructures by a hydrothermal technique. The structures achieved included nanotubes, a lettuce leaf nanostructure and nanosticks, all starting from a ZnO nanostructure of 20 -30 nm and produced by thermal treatment in 6 M NaOH. The process did not use any catalyst or buffer layer and was carried out inside a purpose-built Teflon lined stainless steel autoclave, maintained at a temperature of 70 °C for 24, 48 and 72 hours. The reaction time had a significant influence on the morphology of the resulting products, whose crystallinity and structural properties were studied using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). The FE-SEM images clearly show diffraction peaks associated with the Wurtzite hexagonal-shaped ZnO structure whilst AFM results show that the films produced have a high surface roughness, especially for the intermediate 48 h synthesis time. Nanostructures ultra-selective detection in gas phase lead to application of artificial sensing intelligence. In this paper, we show that fined the H₂ gas concentrations on deliberately controlled sensor device toward specific prepare with ZnO nanostructure.  

Keywords: ZnO, Nanostructure, Hydrothermal, IDE, Artificial intelligence.