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SM ISO690:2012 HOURANI, MohammedKhair, HAMDAN, Tarafah. Preparation of nano- and microstructured gold surfaces by application of a square wave potential regime. In: Surface Engineering and Applied Electrochemistry, 2013, nr. 3(49), pp. 70-75. ISSN 1068-3755. |
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Surface Engineering and Applied Electrochemistry | |||||
Numărul 3(49) / 2013 / ISSN 1068-3755 /ISSNe 1934-8002 | |||||
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Pag. 70-75 | |||||
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Gold nanometallic structures have been prepared by application of square wave potential regime to a platinum electrode in a 1.0x10-3 M HAuCl4 0.5 M H2SO4 solution. Formation of gold particles onto
the platinum surface has been followed by cyclic voltammetry, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. The results indicate that the size, shape, uniformity of distribution
of the particles are affected by the selected parameters of the applied square wave potential regime. Parameters of the square wave include the frequency, the lower and the upper limits of the square
wave and the time of application of the square wave potential regime. The concentration of HAuCl4 in the solution is another important factor. The results of the present work indicated that the 100 Hz frequency is the optimal frequency for obtaining gold nanoparticles on platinum surface. Deposition time has been also found to play a critical role in affecting the size, shape and homogeneity of gold nanostructures at the surface. The surface coverage with nanoparticles as calculated from the decrease in the
charge of hydrogen adsorption/desorption peaks is found to be directly proportional to the time of application of the square wave. Testing the nanostructured gold/Pt electrode for oxidation of formic acid shows its higher catalytic activity than that of platinum and gold plain electrodes. |
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Cuvinte-cheie nanostructured electrodes, gold electrodes, square wave, preparation of electrodes. |
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