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ION-SELECTIVE MEMBRANES BASED ON CHALCOGENIDE GLASSES

R. Tomova1,* , R. Stoycheva-Topalova1, A. Buroff1

Affiliation

  1. Central Laboratory of Photoprocesses “Acad. J. Malinowski”, Bulgarian Academy of Sciences, “Acad. G. Bonchev”str. bl. 109, 1113 Sofia, Bulgaria

Abstract

Ion-selective membranes on the basis of thin evaporated layers of pure and doped chalcogenide glasses have been developed. The membranes showed high sensitivity towards Ag+ and Cu2+ ions –down to 10-6 mol/L, short response time and good selectivity to interfering ions. The electrochemical sensors for Pb2+ ions however are not at the same level. The reasons for this difference have been established by examining the physical properties, AES depth-profile and electrochemical behavior of the three types of membranes. In spite of the promising results and good electrochemical performance, the long-term stability of chalcogenide-based thin film sensors is still a problem. It was established that the plasma deposited polymer film of (PHMDSO) and vacuum deposited polyimide (PI) on the top of chalcogenide glass membrane improve the electrochemical characteristics - increases the sensitivity and long-term stability and keeps the response time. The results obtained are promising for the development of low-cost, highly reliable nanosensors on the basis of chalcogenide glasses..

Keywords

Thin film sensors, Chalcogenide glasses, AES, Polyhexamethyldisiloxane, Polyimide.

Submitted at: April 19, 2005
Accepted at: May 26, 2005

Citation

R. Tomova, R. Stoycheva-Topalova, A. Buroff, ION-SELECTIVE MEMBRANES BASED ON CHALCOGENIDE GLASSES, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 3, pp. 1399-1406 (2005)