Characteristics of the polyaniline films vacuum deposited at a high background pressure

• Published in: Synthetic metals Vol. 156; no. 16; pp. 1097 - 1101
• Main Authors: Li, Hui, Qiu, Hong, Fang, Kun, Li, Jing, Fang, Chunying
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-08-2006; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Characteristic; Exact sciences and technology; Forms of application and semi-finished materials; High background pressure; Polyaniline film; Polymer industry, paints, wood; Sheets and films; Structure; Technology of polymers; Vacuum deposited; High background pressure; Structure; Vacuum deposited; Characteristic; Polyaniline film; Electrical conductivity; Electrical properties; Deposition rate; Experimental study; Thin film; Hydrochloric acid; Conducting polymers; Morphology; Size effect; Doped polymer; Vacuum deposition; Aniline polymer
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2006.07.005

Polyaniline films with different thickness were deposited on unheated glass substrates by vacuum evaporating HCl-doped polyaniline pellets at a high background pressure. Micromorphological, compositional, structural and electrical properties of the films were studied by using field emission scanning electron microscopy, energy dispersive of X-ray spectroscopy, Fourier transform infrared spectroscope and sub-femtoamp source meter. The polyaniline films consist of a large number of flakes. Some flakes are perpendicular to the substrate and they are more in the thick film compared with the thin film. No chlorine is detected in the films. The aromatic structure of polyaniline is retained in all the polyaniline films. However, the polar structure of polyaniline is destroyed in the films. The polyaniline film is in a higher oxidation state compared with the HCl-doped polyaniline pellet. The conductivity of the polyaniline films ranges from 10
−8 to 10
−9
S/cm and is lower than that of the HCl-doped polyaniline pellet as the starting material. Besides, the conductivity decreases with increasing film thickness.