Nanostructured gold-silver surfaces: an AFM study.

P.C DOS SANTOS CLARO; MH FONTICELLI,; GA BENITEZ,; O AZZARONI,; P. L. SCHILARDI; N LUQUE; E. LEIVA; R. C. SALVAREZZA

Mar del Plata

Simposio; 4th Latin American Symposium on Scanning Probe Microscopy, IV LASPM; 2007

<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Arial","sans-serif"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-US; mso-fareast-language:EN-US;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> The preparation of metal and semiconductors nanostructures with defined size and spatial order on metal or semiconductor surfaces is a key point in many fields of nanotechnology.(1) .Metallic ripples have been used as platforms to build anisotropic magnetic nanostructures by deposition of ultrathin layers of transition metals.(2)  Silver nanodots and nanoripples have been grown on nanocavity-patterned Au templates (Fig. 1 (I)) by controlled electrodeposition. The initial step is the growth of 2 Ag monolayers preferentially deposited at nanocavities (Fig. 1(II)). The Ag-coated nanocavities act as preferred sites for instantaneous nucleation and growth of the three-dimensional metallic centers(Fig. 1(III)). By controlling the amount of deposited Ag dots ≈ 40 nm in average size and ≈ 4 nm in average height can be grown with spatial and size distributions dictated by the template (Fig. 1(IV)). The dots are in a metastable state. Further Ag deposition drives the dot surface structure to nanoripples formation (Fig. 1(V)). Results show that electrodeposition on nanopatterned electrodes can be used to prepare a high density of nanostructures with a narrow size distribution and spatial order, as can be concluded from cross section and power spectral density analysis.