Self-assembly of spherical and rod-shaped nanoparticles with full positional control. Issue 47 (22nd November 2019)

• Record Type: Journal Article
• Authors: Lloyd, Julian A.; Liu, Yawei; Ng, Soon Hock; Thai, Thibaut; Gómez, Daniel E.; Widmer-Cooper, Asaph; Bach, Udo
• Is Part Of: Nanoscale. Volume 11:Issue 47(2019)
• Page Start: 22841
• Page End: 22848
• Publication Date: 2019-11-22
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr06679a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Fabricate nanoparticle dimers with a spherical particle either at the tip, the side or on top of a nanorod. Abstract : The controlled positioning of spherical gold nanoparticles and gold nanorods upon self-assembly on a substrate is of great interest for the fabrication of tailored plasmonic devices. Here, an electrostatic approach with a sequential two-step assembly protocol is presented as a cost-effective and high-yield alternative to previously presented, more complex proof of concepts. Three different geometries can be separately produced in large quantities relying on electrostatic attraction and repulsion of the charge-carrying building blocks: a single gold nanoparticle at the tip, the side or on top of a gold nanorod. DLVO theory is used to explain the electrostatic assembly strategy. The process is highly efficient and assembly yields between 79% (at the tip) and 94% (for the nanoparticle at the long side of the nanorod) are achieved.