Abstract
In this work, nitrogen dioxide (NO2) gas sensors based on zinc oxide nanorods (ZnO NRs) decorated with gold nanoparticles (Au NPs) working under visible-light illumination with different wavelengths at room temperature are presented. The contribution of localized surface plasmon resonant (LSPR) by Au NPs attached to the ZnO NRs is demonstrated. According to our results, the presence of LSPR not only extends the functionality of ZnO NRs towards longer wavelengths (green light) but also increases the response at shorter wavelengths (blue light) by providing new inter-band gap energetic states. Finally, the sensing mechanism based on LSPR Au NPs is proposed.
Highlights
Gas pollutants have become, in recent years, one of the main concerns of people living in densely populated areas
We present a NO2 gas sensor based on ZnO nanorods (NRs) decorated with gold nanoparticles (Au NPs) able to work at room temperature
A visible-light-driven room temperature NO2 gas sensor based on localized surface plasmon resonance (LSPR) was successfully fabricated by the electrophoretic deposition of gold nanoparticles (Au NPs) on zinc oxide nanorods (ZnO NRs) grown by a hydrothermal process
Summary
In recent years, one of the main concerns of people living in densely populated areas. Nitrogen dioxide (NO2 ) is a pollutant gas produced in many of the combustion processes related to heating, industry, and transportation [1]. Metal oxide semiconductor (MOX)based chemi-resistive gas sensors are superior to other signal transduction solutions that are usually based on measuring optical or capacitive properties. This is due to the simplicity of setting up the resistance measurement circuit. The operation of resistive gas sensors is usually based on changes in resistivity or conductivity in semiconductor materials, which are due to a series of chemical steps on the surface, including the adsorption, reaction, and desorption of gas molecules [2]. Many efforts have been invested to make such sensors more sensitive, selective, stable, durable, energy efficient, and safe
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