The Synthesis of Organic Gas Sensitive Material Palladiumphthalocyanine Modified by Polyaniline and its Gas Sensitive Property

PdPc was synthesized with Phthalonitrile and p-Cresol as the source material of benzene ring by the template synthesis method of two steps reaction. Through doping with perchloric acid, vitriol and nitric acid, semi conducting doped PANI was obtained. By means of molecular hybrid modification, PdPc and doped PANI was polymerized and formed a kind of new organic semiconductor material PdPc_xPANI_1-x. The combination of chip and new sensitive material was achieved by virtue of vacuum metallizing. PdPc_xPANI_1-x which was hybrid synthesized by FT-IR and SEM was a new kind of material. The film morphology and crystalline phase were characterized through SEM, and it showed that when the evaporation coating temperature was about 350°C~650°C, the surface of film emerged a kind of deposition growth practical which was like tooth. The diameter of the particle is 200nm, very homogeneous and its aperture is ordered. In order to measure gas sensitivity of CuPc_xPANI_1-x thin films, a sealed test box was used. The results indicate: organic gas sensitive materials PdPc_0.15PANI_0.85 doped with vitriol acid has good gas sensitive property to SO₂, PdPc_0.5PANI_0.5 doped with nitric acid has good gas sensitive property to NO₂, PdPc_0.35PANI_0.65 doped with perchloric acid has good gas sensitive property to Cl₂. When v_H is 2.0V, output resistance keeps within 5% and sensitivity keeps within 7.5% in six months.