DEVELOPMENT OF NH 3 GAS SENSOR OPERATING AT ROOM TEMPERATURE BASED ON POLYPYRROLE NANO FILMS

Nguyen Van Huynh; Pham Van Hai; Duong Thi Thu Hang; Bui Ha Trung; Chu Van Tuan; Tran Trung; Do Thi Anh Thu; Ho Truong Giang

Nguyen Van Huynh Hung Yen University of Technology and Education
Pham Van Hai Hung Yen University of Technology and Education
Duong Thi Thu Hang Hanoi University of Science and Technology
Bui Ha Trung Hung Yen University of Technology and Education
Chu Van Tuan Hung Yen University of Technology and Education
Tran Trung Hung Yen University of Technology and Education
Do Thi Anh Thu Institute of Materials Science, Vietnam Academy of Science and Technology
Ho Truong Giang Institute of Materials Science, Vietnam Academy of Science and Technology

Keywords: NH3 gas sensor at room temperature, vapor phase polymerization

Abstract

We have successfully synthesized Polypyrrole (PPy) films directly formed on the surface of the
electrodes by a facile route of vapor phase polymerization method, with the oxidant and dopant agent are
ferric chloride (FeCl3 ). The surface morphologies and chemical structure of samples were considered by
scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FT-IR). The sensitivities
of sensing were studied based on resistance change to the concentration of the NH3 gas (100 - 400 ppm) at
room temperature. These results demonstrated that the response of gas sensor has been strongly affected
by surface morphologies of material membrane. This work shows that PPy films were fabricated from the
vapor phase for a lots promising in applications of NH3 gas sensors operating at room temperature

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