Effect of Bromide on the Surfactant Stabilization Layer Density of Gold Nanorods

Zech T, Schmutzler T, Noll D, Appavou MS, Unruh T (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Langmuir American Chemical Society

Book Volume: 38

Pages Range: 2227-2237

Journal Issue: 7

DOI: 10.1021/acs.langmuir.1c02733

Abstract

Some studies have speculated that the concentration of bromide ions plays a crucial role in the surfactant density surrounding gold nanorods (AuNR). Small-angle X-ray and neutron scattering (SAXS and SANS) experiments were conducted to analyze any influence the bromide ions might have on the stabilization layer and the aggregation behavior of the ligand CTAB molecules in general. The AuNR were immersed in solutions containing a fixed CTA+ concentration of 2 mM and varying bromide ion concentrations from 0 to 22 mM. A patchy AuNR stabilization shell at low bromide ion concentrations was found, contrary to previously published SANS studies on the AuNR stabilization shell. However, with increasing bromide ion concentration, the density of the stabilization shell increases asymptotically toward a closed/collapsed bilayer configuration. AuNR grown under similar conditions show higher anisotropy with larger bromide ion concentrations. Both results indicate that anisotropic growth strongly depends on a sufficiently dense stabilization layer established by high bromide ion concentrations.

Authors with CRIS profile

Tobias Zech Lehrstuhl für Kristallographie und Strukturphysik (ICSP) Tilo Schmutzler Professur für Nanomaterialcharakterisierung (Streumethoden) Dennis Noll Lehrstuhl für Kristallographie und Strukturphysik (ICSP) Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden)

Additional Organisation(s)

Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Zech, T., Schmutzler, T., Noll, D., Appavou, M.-S., & Unruh, T. (2022). Effect of Bromide on the Surfactant Stabilization Layer Density of Gold Nanorods. Langmuir, 38(7), 2227-2237. https://doi.org/10.1021/acs.langmuir.1c02733

MLA:

Zech, Tobias, et al. "Effect of Bromide on the Surfactant Stabilization Layer Density of Gold Nanorods." Langmuir 38.7 (2022): 2227-2237.

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