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

Mougin, K., Gnecco, E., Rao, A., Cuberes, M. T., Jayaraman, S., McFarland, E. W., Haidara, H. and Meyer, E. (2008) Manipulation of gold nanoparticles: Influence of surface chemistry, temperature, and environment (vacuum versus ambient atmosphere). Langmuir, 24 4: 1577-1581. doi:10.1021/la702921v


Author Mougin, K.
Gnecco, E.
Rao, A.
Cuberes, M. T.
Jayaraman, S.
McFarland, E. W.
Haidara, H.
Meyer, E.
Title Manipulation of gold nanoparticles: Influence of surface chemistry, temperature, and environment (vacuum versus ambient atmosphere)
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
1520-5827
Publication date 2008-02-19
Sub-type Article (original research)
DOI 10.1021/la702921v
Volume 24
Issue 4
Start page 1577
End page 1581
Total pages 5
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
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°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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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