Publication Date

2-2-2021

Department

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

Campus Units

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

OSTI ID+

1767237

Report Number

IS-J 10438

DOI

10.1021/acs.jpclett.0c03749

Journal Title

Journal of Physical Chemistry Letters

Volume Number

12

Issue Number

5

First Page

1461

Last Page

1467

Abstract

Using synchrotron-based small-angle X-ray scattering techniques, we demonstrate that poly(ethylene glycol)-functionalized gold nanoparticles (PEG-AuNPs) are assembled into close-packed structures that include short-range order with face-centered cubic structure, where crystalline qualities are varied by controlling the electrolyte concentration, pH, and temperature of the suspensions. We show that interpolymer complexation with poly(acrylic acid) (PAA) is induced by lowering the pH level of the PEG-AuNPs suspensions, and furthermore, increasing the temperature of the suspension strengthens interparticle attraction, leading to improved supercrystal structures. Our results indicate that this strategy creates robust nanoparticle superlattices with high thermal stability. The effects of PAA and PEG chain lengths on the assemblies are also investigated, and their optimal conditions for creating improved superlattices are discussed.

DOE Contract Number(s)

AC02-07CH11358; AC02-06CH11357

Language

en

Publisher

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

Available for download on Wednesday, February 02, 2022

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