Electrochemical nanoscale templating: laterally self-aligned growth of organic-metal nanostructures.
Langmuir
; 28(50): 17537-44, 2012 Dec 18.
Article
em En
| MEDLINE
| ID: mdl-23206166
ABSTRACT
The electrodeposition of Ag into organized surfactant templates adsorbed onto (22 × â3) 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 adsorption sites of the Ag(+) ions and the directionality of Ag nanodeposition. The SDS-Ag nanostructures grow along the long axis of SDS hemicylindrical stripes, and an interaction of Ag with the Au(111) substrate leads to a structural change in the SDS stripe pattern. The SDS-Ag nanostructures undergo dynamic rearrangement in response to changes in the applied electrode potential. At negative potentials, the orientations of SDS-Ag nanostructures are pinned by the (22 × â3) reconstructed pattern. Furthermore, observed differences in Ag nanostructuring on Au(111) without molecular templates (i.e., on a bare Au(111) surface) confirm the role of self-assembled organic templates in producing metal-organic nanostructures under control of the surface potential, which can determine the feature size, shape, and period of the metal nanostructure arrays.
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MEDLINE
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En
Ano de publicação:
2012
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Article