Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/35479
Title: Understanding and reducing photothermal forces for the fabrication of au nanoparticle dimers by optical printing
Authors: Gargiulo, Julian
Brick, Thomas
Violi, Ianina L.
Herrera, Facundo C.
Shibanuma, Toshihiko
Albella Echave, Pablo 
Requejo, Félix G.
Cortés, Emiliano
Maier, Stefan A.
Stefani, Fernando D.
UNESCO Clasification: 33 Ciencias tecnológicas
Keywords: Plasmonics
Optical forces
Thermo-osmosis
Thermophoresis
Colloidal patterning
Reduced graphene oxide
Graphene
Issue Date: 2017
Journal: Nano Letters 
Abstract: Optical printing holds great potential to enable the use of the vast variety of colloidal nanoparticles (NPs) in nano- and microdevices and circuits. By means of optical forces, it enables the direct assembly of NPs, one by one, onto specific positions of solid surfaces with great flexibility of pattern design and no need of previous surface patterning. However, for unclear causes it was not possible to print identical NPs closer to each other than 300 nm. Here, we show that the repulsion restricting the optical printing of close by NPs arises from light absorption by the printed NPs and subsequent local heating. By optimizing heat dissipation, it is possible to reduce the minimum separation between NPs. Using a reduced graphene oxide layer on a sapphire substrate, we demonstrate for the first time the optical printing of Au-Au NP dimers. Modeling the experiments considering optical, thermophoretic, and thermo-osmotic forces we obtain a detailed understanding and a clear pathway for the optical printing fabrication of complex nano structures and circuits based on connected colloidal NPs.
URI: http://hdl.handle.net/10553/35479
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.7b02713
Source: Nano Letters [ISSN 1530-6984], v. 17 (9), p. 5747-5755
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