Title

Salt Mediated Self-Assembly of Poly(ethylene glycol)-Functionalized Gold Nanorods

Publication Date

12-30-2019

Department

Chemical and Biological Engineering; Materials Science and Engineering; Physics and Astronomy; Neuroscience; Ames Laboratory

Campus Units

Chemical and Biological Engineering, Materials Science and Engineering, Physics and Astronomy, Neuroscience, Ames Laboratory

OSTI ID+

1581593

Report Number

IS-J 10039

DOI

10.1038/s41598-019-56730-2

Journal Title

Scientific Reports

Volume Number

9

First Page

20349

Abstract

Although challenging, assembling and orienting non-spherical nanomaterials into two- and three-dimensional (2D and 3D) ordered arrays can facilitate versatile collective properties by virtue of their shape-dependent properties that cannot be realized with their spherical counterparts. Here, we report on the self-assembly of gold nanorods (AuNRs) into 2D films at the vapor/liquid interface facilitated by grafting them with poly(ethylene glycol) (PEG). Using surface sensitive synchrotron grazing incidence small angle X-ray scattering (GISAXS) and specular X-ray reflectivity (XRR), we show that PEG-AuNRs in aqueous suspensions migrate to the vapor/liquid interface in the presence of salt, forming a uniform monolayer with planar-to-surface orientation. Furthermore, the 2D assembled PEG functionalized AuNRs exhibit short range order into rectangular symmetry with side-by-side and tail-to-tail nearest-neighbor packing. The effect of PEG chain length and salt concentration on the 2D assembly are also reported.

DOE Contract Number(s)

AC02-07CH11358; NSF/CHE-1834750; AC02-06CH11357

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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