Study on NO₂ gas sensitivity of metal phthalocyanine enhanced by graphene quantum dots

Traditional semiconductor gas sensors mainly based on metal oxides have some problems such as high working temperature, energy consumption, low sensitivity, poor anti-interference ability and selectivity. Organic semiconductors, represented by phthalocyanine (MPc), are becoming the choice of new because their advantages abundant raw materials, cost, simple process, strong compatibility to work at room temperature. In this study, (molecular diameter about 1.3 nm) graphene quantum dots (diameter distribution 1-3 similar in size, which facilitates construction conjugated plane structure achieve rapid charge transfer within material, thus realizing ultra-sensitive response sensor specific molecules work, ethylenediamine was used adhesive bond tetracarboxylic (MPc-COOH) (GQDs) form a composite material MPc-GQD. The value 100 ppm NO 2 can reach 19.8 s it has good recovery repeatability under premise laser-assisted recovery. results provide idea for development temperature using organic semiconductors carbon nanomaterials.