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Issue 10, 2020
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Determining the morphology and concentration of core–shell Au/Ag nanoparticles

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Abstract

Accurately measuring the shape, structure and concentration of nanoparticles (NPs) is a crucial step towards understanding their formation and a prerequisite for any applications. While determining these parameters for single-metal NPs is by now rather routine, reliably characterizing bimetallic NPs is still a challenge. Using four complementary techniques: transmission electron microscopy (TEM), light absorbance spectroscopy (AS), small-angle X-ray scattering (SAXS) and inductively coupled plasma mass spectrometry (ICP-MS) we study bimetallic nanoparticles obtained by growing a silver shell on top of a gold seed. The initial quasi-spherical objects become faceted and grow into a rounded cube as the molar silver-to-gold ratio K increases. The shape evolution is well described by SAXS and TEM. The shell thickness, overall size polydispersity and number particle concentration obtained by the various methods are in good agreement, validating the use of non-invasive in situ techniques such as AS and SAXS for the study of bimetallic NPs.

Graphical abstract: Determining the morphology and concentration of core–shell Au/Ag nanoparticles

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Supplementary files

Article information


Submitted
31 Jul 2020
Accepted
01 Sep 2020
First published
02 Sep 2020

This article is Open Access

Nanoscale Adv., 2020,2, 4522-4528
Article type
Paper

Determining the morphology and concentration of core–shell Au/Ag nanoparticles

J. Lyu, V. Geertsen, C. Hamon and D. Constantin, Nanoscale Adv., 2020, 2, 4522 DOI: 10.1039/D0NA00629G

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