✦ LIBER ✦

X-ray photoelectron spectroscopic studies of conducting polyaniline, poly bisphenol A carbonate and electrochemically synthesized composite of the two

✍ Scribed by A Bhattacharyya; Rita Roy; SK Sen; Suchitra Sen; AK Chakraborty; TK Bhattacharyya

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 398 KB
Volume: 49
Category: Article
ISSN: 0042-207X
DOI: 10.1016/s0042-207x(97)00169-3

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✦ Synopsis

X-ray photoelectron studies of electrochemically prepared conducting polyaniline (PAN), polycarbonate (PC) and PAN/PC composite

films have been studied. The core level spectra of carbon, oxygen, nitrogen and chlorine have been synthesized using Gaussian distribution functions. The analysis of the first two elements indicates the presence of carbonyl group on the surface of PAN samples. The detailed analysis of nitrogen and chlorine spectra show the presence of N-Cl bonding apart from usual covalent peaks. No major structural modification in the composite film could be detected. Only the presence of covalent chlorine derived from chloroform used to prepare these films have been observed. From the measurement of electrical conductivity of these films it seems that it is the proportion of ionic chlorine, rather than covalent chlorine to nitrogen that is important in determining the conductivities.

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Oxygen interaction of CdS-based gas sens

Oxygen interaction of CdS-based gas sensors with different stoichiometric compositions was studied by X-ray photoelectron spectroscopy (XPS) and thermal-desorption mass spectroscopy observations combined with conductivity measurements. Three different types of film with different atomic ratios of Cd/S were used in the study of oxygen chemisorption in a low-temperature range between 300 and 570 K. Spray pyrolysis was used for the deposition of the films on glass substrates; XPS and energy dispersive spectroscopy of X-ray together with atomic force microscopy and scanning electron microscopy were used for the characterization of the composition and structure of the films. It was possible to distinguish different temperature ranges for the thermal desorption of the different adsorbed oxygen species. A comparison of the data from XPS and mass-spectroscopy observations with conductance measurements allows to conclude that metallic surface atoms are responsible for different interactions of oxygen species with CdS surfaces.

📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 379 KB