Synthesis of  Palladium Nanowires for Hydrogen Gas Sensor by Field Ionization

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dolatkhah, Naeme | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41768 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Irajizad, Azam
Abstract:
The interesting properties of metallic nanowires provide many applications in electronic sensors. In this project, we have synthesized Pd nanowires using electrodeposition method. These nanowires are useful for hydrogen sensors by measuring field ionization current in gas. In this project, Pd nanowires were synthesized by electrochemical deposition method in PCT template with 100 nm pore size. The used solution was contained 2mM PdCl2 + 0.1M HCl. The best reduction potential was determined about -0.2V and the best time for synthesizing nanowires was 7 minutes. Chronoampermetric diagrams showed four steps, capacitive current, growth in the holes, reaching to the surface of PCT and the growth on the surface. At this time (7 minutes), the holes of PCT are full and the head of Pd nanowires reach to the surface without connection with them. The XPS and EDAX characterization, demonstrated Pd in the holes of PCT, and by SEM images, we can see nanowires and the position of them in PCT. At the end of this project, we used the ready Pd nanowires for gas sensor in hydrogen gas. The results of this experiment, show that nanowires are sensitive to hydrogen and it’s sensitivity is about 75%
Keywords:
Nanowire ; Electrochemistry ; Palladium ; Hydrogen Gas Sensor ; Polycarbonate