Deterministic Deposition of Nanoparticles with Sub-10 nm Resolution

Accurate deposition of nanoparticles at defined positions on a substrate is still a challenging task, because it requires simultaneously stable long-range transport and attraction to the target site and precise short-range orientation and deposition. Here we present a method based on geometry-induce...

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Bibliographic Details
Published inNano letters Vol. 19; no. 12; pp. 8855 - 8861
Main Authors Fringes, Stefan, Schwemmer, C, Rawlings, Colin D, Knoll, Armin W
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 11.12.2019
Subjects
Nanofluidics
nanoparticle assembly
nanowires
nanofabrication
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Summary:Accurate deposition of nanoparticles at defined positions on a substrate is still a challenging task, because it requires simultaneously stable long-range transport and attraction to the target site and precise short-range orientation and deposition. Here we present a method based on geometry-induced energy landscapes in a nanofluidic slit for particle manipulation: Brownian motors or electro-osmotic flows are used for particle delivery to the target area. At the target site, electrostatic trapping localizes and orients the particles. Finally, reducing the gap distance of the slit leads sequentially to a focusing of the particle position and a jump into adhesive contact by several nanometers. For 60 nm gold spheres, we obtain a placement accuracy of 8 nm. The versatility of the method is demonstrated further by a stacked assembly of nanorods and the directed deposition of InAs nanowires.
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ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.9b03687