Nitrogen doped high quality CVD grown graphene as a fast responding NO2 gas sensor

Abstract

Nitrogen doped graphene (NGr) has been synthesized using a chemical vapor deposition (CVD) method for the fast detection of NO₂ gas at room temperature. The quality of these NGr nanosheets has been confirmed using FESEM, XPS and Raman spectroscopy. Different nitrogen doping concentrations in the Gr lattice have been investigated by varying the growth time for the diffusion of nitrogen in the Gr lattice sites. The design and fabrication of the gas sensor device have been optimized using a SiO₂ substrate and patterned gold electrodes. This nitrogen doped graphene honeycomb lattice improves the adsorption sites for gas molecules, which could improve the sensitivity of the gas sensor compared to CVD grown pristine graphene (Gr) nanosheets. Thus, the NGr nanosheet NO₂ gas sensor reported here presents a better alternative for next generation ultrathin lightweight portable devices.