Phthalocyanine Organic Thin-Film Transistors for the Detection of dimethyl methyl phosphonate (DMMP)

The electrical properties of Metal-Phthalocyanines (M-Pc) are affected upon exposure to gases containing not only some oxidizing/deoxidizing molecules but also nerve agent simulants. This phenomenon finds application in the use of Organic Thin-Film Transistors (OTFTs) based on copper phthalocyanine (CuPc) and cobalt phthalocyanine (CoPc) as gas sensors. In this work, tests of dimethyl methyl phosphonate (DMMP) detecting were carried out, and the sensing mechanism of OTFT DMMP sensors was further investigated by the transfer curve of OTFTs and the UV-Vis absorption spectra of sensitive films before and during DMMP vapor exposure. The results showed that M-Pc-based OTFTs can represent a new class of DMMP sensors