Features of the Metal Nuclei Spatial Distribution on the Glassy Carbon Surface During the Receipt of Thin Films by Elect
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(1)
with q;l.4 and nl [1, 2] . Besides the radius of the "structural spots" on which the mutual correlation in nuclei location is fixed equals 60-160 gim [2]. On the basis of the experimental data the construction model for "structural spots" was suggested [1]. Because the present picture is unlikely to occur it was not seen visually. Later Despich together with co-authors [3] succeeded in extracting the similar picture with the help of the special modeling experiments conducted during the investigation of the process of copper electrocrystallization on glassy carbon. He did not, however, receive actual proof of the presence of the strict sequence of ti, t2 , ... t. for which tn+I/tns- 1.4. The goal of this work is to look through the neighboring internuclei distances in the real spatial nuclei distribution. EXPERIMENT The deposition of the copper, cadmium, and silver nuclei on the isotropic surface of glassy carbon was made with the galvanostatic and potentiostatic double pulse methods from a sulfuric and nitrate electrolyte [1]. The electrolytes were made from the reagents of "C.P" brand and cleaned from the various inorganic and organic impurities present with the commonly used methods. According to [4], the support structure is more reluctant to be reproduced after the surface is abraded and mechanically polished with MgO until all the surface defects seen under the 89 Mat. Res. Soc. Symp. Proc. Vol. 403 01996 Materials Research Society
microscope (x 200) are removed. Actually, as the experimental results showed, this type of preparation provided not only the geometrical uniformity of the specular glassy carbon surface but also eliminated the basis structure influence on the nucleation processed [5]. More than that, the distances divisible by the main parameters of the deformed graphite lattice calculated from the data of radiographic analysis of glassy carbon were not found in the typical internuclei distances. The pictures of the nuclei location spread on the cathode surface were photographed, and the negatives were processed through the automated microphotomater. In order to receive the reliable array of the internuclei distances' data each photograph was scanned in five arbitrary parallel sections. Then the data file formed by this method was inputted to the personal computer for statistical processing. To find out the neighboring t, and therefore to determine the mutual location of nuclei in the "structural spot" the following method was applied. First, t1, t 2 , ... , tn described by the equation (1) with qt1l.4 were determined based on the photographs by the method of Fraunhofer diffracting pictures [1]. Then the received "flow" of internuclei distances with the help of microphotometer was divided by n groups each containing only the intemuclei distances approximately equal to the determined tn size. At the same time the internuclei distance t was considered to belong to group n if t = t. ± 0.17. tn
(2).
Depending on what sequential internuclei distance proceeded the one analyzed in the "flow", n su
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