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Issue 14, 2019
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Drying of electrically conductive hybrid polymer–gold nanorods studied with in situ microbeam GISAXS

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Abstract

Gold nanorods (AuNRs) with conductive polymer shells are interesting colloidal building blocks for electronics. Hybrid particles with AuNR cores and poly(3,4-ethylenedioxythiophene) or polystyrene sulfonate (PEDOT:PSS) shells were prepared as stable aqueous dispersions. Film formation during the drying of such dispersions is known to affect the electric conductivity of the material. We observed the mechanisms of drying in thin, spray-coated films with grazing incidence small-angle X-ray scattering (GISAXS). A sparse, uniform monolayer formed because the anisotropic shape of the AuNR inhibited “coffee-ring” effects. We used generalized two-dimensional correlation (2DC) spectroscopy to analyze the GISAXS data and to decipher the microscopic structure formation of the film during drying. Four major scattering peaks were attributed to porous PEDOT, PSS, Au, and the substrate layer. Their time-dependent intensity indicated the sequence of film formation: AuNRs with mobile shells arranged on the substrate first, and PEDOT and then PSS dried sequentially around the gold core. We discuss the final phase-separation of PEDOT:PSS on the hybrid rods.

Graphical abstract: Drying of electrically conductive hybrid polymer–gold nanorods studied with in situ microbeam GISAXS

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Article information


Submitted
06 Dec 2018
Accepted
19 Mar 2019
First published
20 Mar 2019

Nanoscale, 2019,11, 6538-6543
Article type
Communication

Drying of electrically conductive hybrid polymer–gold nanorods studied with in situ microbeam GISAXS

P. Zhang, B. Reiser, L. González-García, S. Beck, J. Drzic and T. Kraus, Nanoscale, 2019, 11, 6538
DOI: 10.1039/C8NR09872G

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