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Título: | Structural modifications of gold thin films produced by thiol-derivatized single-stranded DNA immobilization |
Autor: | Arroyo-Hernández, María CSIC ORCID; Švec, Martin CSIC ORCID; Rogero, Celia CSIC ORCID; Briones, Carlos CSIC ORCID; Martín-Gago, José A. CSIC ORCID ; Costa Krämer, José Luis CSIC ORCID | Palabras clave: | Gold thin film Structure Surface stress DNA immobilization |
Fecha de publicación: | 16-ene-2014 | Editor: | Institute of Physics Publishing | Citación: | Journal of Physics: Condensed Matter 26(5): 055010 (2014) | Resumen: | Recent experiments have reported an opposite sign of the differential surface stress produced on gold-coated cantilevers by a thiol-derivatized single-stranded DNA (SH-DNA) immobilization process. The sign of the surface stress depends on the method used to evaporate the gold thin film, being compressive (negative) or tensile (positive) for e-beam or resistively deposited gold, respectively. This study investigates the origin of this effect by means of a combination of x-ray diffraction and x-ray photoelectron spectroscopy. Both e-beam and resistively grown gold thin films are characterized to find the subtle differences responsible for this intriguing stress behaviour. Somewhat remarkably, these studies show a tight relation between the surface structure of the gold overlayer and the SH-DNA immobilization efficiency. The average grain size variation seems to correlate well with the differential surface stress triggered by the SH-DNA immobilization previously reported. These results suggest that the relation of the probe molecules with the surface structure must be considered to understand surface stress changes. © 2014 IOP Publishing Ltd. | Versión del editor: | http://dx.doi.org/10.1088/0953-8984/26/5/055010 | URI: | http://hdl.handle.net/10261/95533 | DOI: | 10.1088/0953-8984/26/5/055010 | Identificadores: | issn: 0953-8984 e-issn: 1361-648X |
Aparece en las colecciones: | (IMN-CNM) Artículos (CAB) Artículos (CFM) Artículos (ICMM) Artículos |
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