Abstract
This article reports the effects of natural plant proteins on the morphology of zinc oxide nanoparticles (ZnONPs) prepared via a precipitation method. Green synthesised ZnONPs have a wide range of uses such as biomedical applications, water purification, optical devices and gas sensors. The non-toxic and economical technique described in this article is favourable for large-scale production too. ZnONPs were produced from a zinc acetate precursor with dye extract of Ixora Coccinea (IC) leaves as a capping agent. The as-prepared ZnONPs were characterised by X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV-visible (UV-vis), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) techniques. The XRD analysis showed an average crystallite size of 23 nm. The SEM analysis revealed a reduction in aggregation of ZnO crystallites due to addition of dye extracts of IC. EDX and UV-vis results confirmed the formation of pure ZnONPs. Finally, the gas sensing properties of ZnO films, prepared by doctor blade method, were used to detect ethanol vapour. The results showed gas response ratios of 28.7 and 5.4 at 800 ppm and 40 ppm exposure, respectively. Furthermore, the response time and recovery time were found to be 24 sec and 47 sec, respectively at 200 ppm exposure of ethanol vapour.
Highlights
Nanomaterials are classified based on their size
The present study describes the preparation of zinc oxide nanoparticles (ZnONPs) using dye extracts of Ixora Coccinea (IC) leaves, its characterisation and its utilisation in the detection of ethanol vapour
ZnONPs were successfully fabricated using dye extract of IC leaves as a capping agent by precipitation method
Summary
Nanomaterials are classified based on their size. Their size ranges from one to a few hundred nanometers. Among various MOS nanoparticles, zinc oxide nanoparticles (ZnONPs) have garnered significant attention for their use in applications such as gas sensors, biosensors, pollution control and piezoelectric devices This is primarily because of their high mobility and reactivity, biocompatibility and high chemical and thermal stability.[6–7]. The surface structure of ZnO can be modified by strategies like metal doping and surface treatment.28–29Among them, the addition of proteins and other phytochemicals from the natural plant is considered a significant one as it enhances the stability of the nanoparticles.[19] In this process, the extract’s presence aids in controlling the growth parameters such as aggregation of crystallites and forms pure and narrow particle size distributed materials.[27]. The present study describes the preparation of ZnONPs using dye extracts of IC leaves, its characterisation and its utilisation in the detection of ethanol vapour
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