4.8 Article

Deterministic Deposition of Nanoparticles with Sub-10 nm Resolution

期刊

NANO LETTERS
卷 19, 期 12, 页码 8855-8861

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03687

关键词

Nanofluidics; nanofabrication; nanowires; nanoparticle assembly

资金

  1. European Research Council [307079, 825794]
  2. Swiss National Science Foundation (SNSF) [200020-144464, 200021-179148]
  3. European Research Council (ERC) [307079, 825794] Funding Source: European Research Council (ERC)
  4. Swiss National Science Foundation (SNF) [200020_144464, 200021_179148] Funding Source: Swiss National Science Foundation (SNF)

向作者/读者索取更多资源

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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