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Electrochemical behaviour of gold modified with contaminated TMP amine adlayers studied by STM, CV, EPR |
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| Authors: | P. Krukowski P.J. Kowalczyk W. Olejniczak M. Puchalski |
| Affiliation: | a Division of Physics and Technology of Nanometric Structures, Solid State Physics Department, University of Lodz, Pomorska 149/153, 90-236 Lodz, Poland b Department of General and Inorganic Chemistry, University of Lodz, Narutowicza 68, 90-136 Lodz, Poland c Department of Molecular Biophysics, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland |
| Abstract: | Scanning tunnelling microscopy (STM), cyclic voltammetry (CV) and electron paramagnetic resonance spectroscopy (EPR) were used to investigate the influence of the TMP amine derivative on Au (1 1 1). The STM results show that the gold surface covered by the adlayer of the TMP derivative is easily modified (holes formation) after increasing the bias voltage to 0.5 V. The CV and EPR results show the electrochemical origin of observed STM topography changes. It is suggested that TMP could be oxidized to the nitroxyl TEMPO radical which adsorbs on Au in the form of an oxoammonium cation. Such an oxoammonium cation at the potential of 0.5 V forms a permanent complex of gold and the nitroxyl radical which could be easily desorbed during STM imaging. |
| Keywords: | 07.79.Cz 81.16.Rf 81.65.Cf |
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