Structural modifications of gold thin films produced by thiol-derivatized single-stranded DNA immobilization
| Autor: | José A. Martín-Gago, Martin Švec, Carlos Briones, Celia Rogero, María Arroyo-Hernández, José Luis Costa-Krämer |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), Ministerio de Economía y Competitividad (España), European Commission, Comunidad de Madrid |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Surface Properties Surface stress Immobilized Nucleic Acids Structure DNA Single-Stranded Condensed Matter Physics DNA immobilization Grain size Overlayer Stress (mechanics) Crystallography X-ray photoelectron spectroscopy Ultimate tensile strength Molecule General Materials Science Gold thin film Gold Sulfhydryl Compounds Thin film |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1361-648X |
| Popis: | 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. JLCK and MAH acknowledge financial support from MAT2008-06330. Work at Centro de Astrobiología was supported by MICINN (grants EUI2008-00158, EUI2008-00122 and BIO2010-20696), CSIC (grant 200920I040), the European Union and Comunidad de Madrid. CR acknowledges the financial support from MAT2010-21156-C03-03. |
| Databáze: | OpenAIRE |
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