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The first electrochemical method to prepare Au-containing nancomplexes with controllable particle size via roughening gold substrates with oxidation-reduction cycles (ORC) of various scans in 0.1 N KCI aqueous solutions without the addition of any stabilizer is reported. The prepared nanocomplex size increases from 2 to 50 nm with the increase of the ORC scan from 25 to 400 cycles.

The first electrochemical pathway to prepare Au-containing nanocomplexes with the mean diameter of 2 nm in 0.1 N KCI aqueous solutions without addition of any stabilizer is reported. The electrochemical activities of AuCI4-nanocomplexes existing in the aqueous solution during oxidation-reduction cycles (ORC) treatment for roughening Au substrate are found that can be used to fabricate Au/PPy core-shell nanocomposites with extremely high conductivities and further prepare elemental Au(0) nanoparticles.

A strategy to electrodeposit polypyrrole (PPy) or roughened silver substrates, accomplished by a triangular-wave oxidation-reduction cycle (ORC) for three scans in an aqueous solution containing 0.1 N KCl is studied. Different view on how Raman spectroscopy has proved to be an effective means to evaluate the structure situation of PPy in various states.

Copper is underpotentially deposited on electrochemically roughened Au(111) by using the applications of self-assembled monolayers (SAMs). The characteristics of autopolymerizaion and electropolymerization are studied.

The polypyrrole (PPy) films were electrochemically deposited on roughened gold substrates with different predominant crystalline orientations of (111) and (220) respectively. The result indicates that the (220) crystalline orientation of gold was partially changed into (111) one after gold was roughened with oxidation-reduction cycles (ORC) treatment.

The first electrochemical oxidation-reduction cycle procedure to roughen gold substrates in 0.1 N HCl aqueous solutions containing 1 nM rutile TiO2 nanoparticles under the irradaition of UV light is presented. The SERS spectrum of polypyrrole electrodeposited on the corresponding roughened gold substrate exhibits a 5-fold higher intensity compared to that without he contribution of TiO2 nanoparticles.

Polypyrrole (PPy) films were electrodeposited on electrochemically roughened gold substrates modified by argon plasma treatment. The surface-enhanced Raman scattering (SERS) spectroscopy of polypyrrole electrodeposited on this roughened gold substrate modified by argon plasma treatment exhibits a higher intensity by 8-fold, as compared with the SERS of PPy electrodeposited on an unmodified roughened gold substrate.

Size-controlled gold nanoparticles, ranging from 2 to 15 nm in diameter, were prepared from gold substrates in 0.1 N HCl aqueous solutions without the addition of any stabilizers by sonoelectrochemical methods. It was observed that the ratio of gold nanoparticles to gold containing nanocomplexes in solutions could be controlled by adjusting the sonoelectrochemical reduction time.

A study in which polypyrrole (PPy) films are electrodeposited on gold substrates roughened by a triangular-wave oxidation-reduction cycle (ORC) in 0.1 N HCl aqueous solution is reported. The surface-enhanced Raman scattering (SERS) spectroscopy of PPy with Au monolayers/PPy/roughened Au substrate is described that exhibits a higher intensity by 1 order of magnitude and a better resolution, as compared with the normal SERS of PPy electrodeposited on a roughened Au substrate.