Abstract
Herein, an ultrafast, sensor has been developed for trace-level detection of Ammonia (NH3) gas using hexagonal-shaped ZnO nanoparticles (NPs). The ZnO NPs were grown by low-cost eco-friendly green synthesis process and characterized by various techniques. The electron microscopic images reveal the synthesis of uniform, highly dense and hexagonal-shaped ZnO NPs. The UV–Vis spectra illustrate a band gap of 3.89eV. XRD, XPS and Raman studies explain the high-quality hexagonal wurtzite-structure of ZnO NPs showing presence of electronic/chemical states of ions. The NH3 gas sensing properties of ZnO NPs were evaluated at different concentrations. The sensor exhibited an excellent response value of 2.5 at 5 ppm NH3 wherein quick response time was 5 s and fastest recovery time was 8 s. The sensing results could be attributed to the optimum number of oxygen species and active sites which are responsible for enhanced performance of the developed ZnO NPs based sensor.
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