Modified CNTs for NO2 detection

Abstract

This paper deals with nitrogen dioxide gas sensor based on multi-wall carbon nanotubes functionalized by carboxyl groups. The carbon nanotubes were non-covalent modified by lead phthalocyanine. The modification showed improvement of important sensor properties. Sensitivity change is 50 % from original value under exposure to 10 ppm of nitrogen dioxide. The dynamic properties of sensor are much better in comparison with non-modified carbon nanotubes. Gas desorption was accelerated by UV illumination and desorption time is shortened to several seconds.