Chemical Defect‐Driven Response on Graphene‐Based Chemiresistors for Sub‐ppm Ammonia Detection

Gas sensors are essential in several fields and, general, features such as high sensitivity, quick response, and fast recovery required, along with low power consumption cost. Graphene is considered a promising material for gas sensing applications, its functionalization often being requisite. In the present study, we developed competitive ammonia detection. Interestingly, an easy efficient method to functionalize graphene by using diazonium chemistry different functional groups. Moreover, prove superior capability of our covalently modified layers. These experimental data have been consistently interpreted theoretical calculations, which reveal defect-driven sensor's response ammonia. results open possibility comprehensive design use these graphene-based real applications.