We have studied the dynamics of the CuS fractal films formation induced by spatial patterns formed in oscillating chemical reaction--oxidation of ascorbic acid by air oxygen in the presence of hydrogen sulfide ions, methylene blue, and copper(II) coordination compound. The formation of the CuS film is observed in this system due to the slow reaction between copper(II) coordination compound and hydrogen sulfide ions. We show that the fractal dimension of the CuS film increases with time. We also estimated the multifractal spectrum of films formed during different time intervals. The multifractal divergence (e.g. the difference between maximal and minimal values of the f((alpha) ) spectrum) depends nonmonotonically on time. At the beginning of the film formation it decreases. After some interval of time it starts to increase. This observation allowed us to develop a method of synthesis of the CuS fractal films with different values of fractal divergencies. Moreover, we develop a technique to form the Cu²⁺-selective electrodes with fractal CuS surfaces. We found that selectivity and sensitivity of these electrodes depend on the value of the fractal divergence and do not depend on the fractal dimension.

Date Published: 18 November 1999
PDF: 10 pages
Proc. SPIE 3904, Fourth International Conference on Correlation Optics, (18 November 1999); doi: 10.1117/12.370428

Published in SPIE Proceedings Vol. 3904:
Fourth International Conference on Correlation Optics
Oleg V. Angelsky, Editor(s)