Electrodeposition of Ag and Pd on a Reconstructed Au(111) Electrode Surface Studied by In situ Scanning Tunneling Microscopy
نویسندگان
چکیده
Electrochemical deposition of Ag and potential-induced structural change of the deposited Ag layer on a 23 3 reconstructed surface of Au(111) electrode were followed by in situ scanning tunneling microscope (STM). A uniform Ag monolayer was formed on a reconstructed Au(111) surface in a 50 mM H2SO4 solution at +0.3 V (vs. Ag/AgCl) after adding a solution containing Ag2SO4 so that the concentration of Ag in the STM cell became ca. 2 M. No characteristic height corrugation such as the Au reconstruction was observed on the surface, indicating that the lifting of the substrate Au reconstruction occurred by Ag deposition. The formed Ag monolayer was converted to a net-like shaped Ag nano-pattern of biatomic height when the potential was stepped from +0.3 V to –0.2 V in the solution containing 2 M Ag. This result indicates that the substrate Au(111)-(11) surface was converted to the reconstructed surface even in the presence of Ag adlayer. Quite different structure was observed for Pd deposition on a reconstructed surface of Au(111) electrode at +0.3 V and the origin for this difference between Ag and Pd deposition are discussed.
منابع مشابه
Electrochemical nanoscale templating: laterally self-aligned growth of organic-metal nanostructures.
The electrodeposition of Ag into organized surfactant templates adsorbed onto (22 × √3) reconstructed Au(111) is investigated by in situ electrochemical scanning tunneling microscopy. Ag(+) concentrations of as low as 2.5 × 10(-6) M allow the visualization of the electrochemical molecular templating effect of a sodium dodecyl sulfate (SDS) adlayer. The SDS hemicylindrical stripes determine the ...
متن کاملIn situ Real-time Monitoring of Electrochemical Ag Deposition on a Reconstructed Au(111) Surface Studied by Scanning Tunneling Microscopy
متن کامل
A novel study on the stepwise electrodeposition approach for the synthesis of Pd based nanoparticles, characterization, and their enhanced electrooxidation activities
Herein, a stepwise electrodeposition technique was used to synthesize the Pd based nanoparticles on indium-tin oxide (ITO) electrodes. First of all, Pd nanoparticles were electrodeposited on ITO via one step electrodeposition technique. Furthermore, Au was electrodeposited on Pd. Finally, Co was electrodeposited on Au and Pd electrodeposited ITO electrode via stepwise electrodeposition techniqu...
متن کاملA novel study on the stepwise electrodeposition approach for the synthesis of Pd based nanoparticles, characterization, and their enhanced electrooxidation activities
Herein, a stepwise electrodeposition technique was used to synthesize the Pd based nanoparticles on indium-tin oxide (ITO) electrodes. First of all, Pd nanoparticles were electrodeposited on ITO via one step electrodeposition technique. Furthermore, Au was electrodeposited on Pd. Finally, Co was electrodeposited on Au and Pd electrodeposited ITO electrode via stepwise electrodeposition techniqu...
متن کاملCo nanoislands on Au(111) and Cu(111) surfaces studied by scanning tunneling microscopy and spectroscopy.
Co nanoislands on the Au(111) and Cu(111) surfaces have been studied by scanning tunneling microscopy and spectroscopy. The experimental results showed that Co nanoislands prefer to aggregate at the step edge and dislocation sites on the reconstructed Au(111) surface and at the step edge on the Cu(111) surface, respectively. In addition, based on dZ/dV-V spectra, in both the Co/Au(111) and the ...
متن کامل