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Issue 11, 2008
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Effect of the thickness of thallium deposits on the values of EQCM sensitivity constant

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Abstract

Three methods were used to obtain values of the sensitivity constant (Cf) of an electrochemical quartz crystal microbalance (EQCM) using solutions of Tl+ ions: chronoamperometry, chronopotentiometry and cyclic voltammetry. The results obtained by these three methods showed that the Cf values were very sensitive to experimental conditions used to form deposits and the three techniques revealed that Cf is markedly influenced by the roughness of thallium films. For example, if the thickness is low or too high, the relative error of Cf with respect to the theoretical value is in the order of −20% due to its roughness and mechanical stress produced by the difference in atomic size. On the contrary, if the thicknesses are intermediate, the Cf values approach the theoretical value with errors that may be below +5%. Furthermore, the electrodes employed in this determination can be used again without important modifications in their surface composition.

Graphical abstract: Effect of the thickness of thallium deposits on the values of EQCM sensitivity constant

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Article information


Submitted
28 May 2008
Accepted
18 Jun 2008
First published
21 Aug 2008

New J. Chem., 2008,32, 1935-1944
Article type
Paper

Effect of the thickness of thallium deposits on the values of EQCM sensitivity constant

A. Donjuan-Medrano and A. Montes-Rojas, New J. Chem., 2008, 32, 1935
DOI: 10.1039/B808802K

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