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Manipulation of gold nanoparticles : influence of surface chemistry, temperature, and environment (vacuum versus ambient atmosphere)

Mougin, K. and Gnecco, E. and Rao, A. and Cuberes, M. T. and Jayararnan, S. and McFarland, E. W. and Haidara, H. and Meyer, E.. (2008) Manipulation of gold nanoparticles : influence of surface chemistry, temperature, and environment (vacuum versus ambient atmosphere). Langmuir, Vol. 24, H. 4. pp. 1577-1581.

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Official URL: http://edoc.unibas.ch/dok/A5262103

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Abstract

We have manipulated raw and functionalized gold nanoparticles (with a mean diameter of 25 nm) on silicon substrates with dynamic atomic force microscopy (AFM). Under ambient conditions, the particles stick to silicon until a critical amplitude is reached by the oscillations of the probing tip. Beyond that threshold, the particles start to follow different directions, depending on their geometry and adhesion to the substrate. Higher and lower mobility were observed when the gold particles were coated with methyl- and hydroxyl-terminated thiol groups, respectively, which suggests that the adhesion of the particles to the substrate is strongly reduced by the presence of hydrophobic interfaces. Under ultrahigh vacuum conditions, where the water layer is absent, the particles did not move, even when operating the atomic force microscope in contact mode. We have also investigated the influence of the temperature (up to 150 degrees C) and of the geometrical arrangement of the particles on the manipulation process. Whereas thermal activation has an important effect in enhancing the mobility of the particles, we did not find differences when manipulating ordered versus random distributions of particles.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Chemical Society
ISSN:0743-7463
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:55

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