Abstract

In this paper, a new, to the best of our knowledge, optical fluorescent sensor for the sensing of nitric oxide (NO) gas is developed. The optical NO sensor based on ${\rm{CsPbB}}{{\rm{r}}_3}$ perovskite quantum dots (PQDs) is coated on the surface of filter paper. The ${\rm{CsPbB}}{{\rm{r}}_3}$ PQD sensing material can be excited with a UV LED of a central wavelength at 380 nm, and the optical sensor has been tested in regard to monitoring different NO concentrations from 0–1000 ppm. The sensitivity of the optical NO sensor is represented in terms of the ratio ${I_{N2}}/{I_{1000\,\,\rm ppm\:NO}}$, where ${I_{N2}}$ and ${I_{1000\,\,\rm ppm\:NO}}$ represent the detected fluorescence intensities in pure nitrogen and 1000 ppm NO environments, respectively. The experimental results show that the optical NO sensor has a sensitivity of 6. In addition, the response time was 26 s when switching from pure nitrogen to 1000 ppm NO and 117 s when switching from 1000 ppm NO to pure nitrogen. Finally, the optical sensor may open a new approach for the sensing of the NO concentration in the harsh reacting environmental applications.

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