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In situ synthesis of gold nanoparticles in polymer films under concentrated sunlight: control of nanoparticle size and shape with solar flux

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Abstract

We propose an original technique for synthesizing plasmonic nanocomposites under concentrated sunlight. Polymer films doped with gold salts are prepared by spin-coating; the nanoparticle growth is triggered within the polymer matrix by exposing the film to concentrated solar irradiation. For the first time, we demonstrate that the variation of solar flux alone allows for controlling the nanoparticle size distribution and shape and, thereby, the final plasmonic response of the composite. Interestingly, thanks to this optical approach, the in operando measurement of the spectroscopic response permits monitoring of the growth of the nanoparticles in real time. The experimental results give us details about the differences in the nanoparticle growth mechanisms at different solar fluxes. At high flux, small nanospheres with a diameter centered around 3 nm to 6 nm are formed. At lower flux, bigger nanoprisms of 12–18 nm are synthesized. The mechanisms are discussed and different pathways are envisaged. Finally, we demonstrate the possibility of performing a fully green synthesis by using our method to grow gold nanoparticles in a biopolymer.

Graphical abstract: In situ synthesis of gold nanoparticles in polymer films under concentrated sunlight: control of nanoparticle size and shape with solar flux

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Article information


Submitted
12 Nov 2019
Accepted
16 Dec 2019
First published
17 Dec 2019

React. Chem. Eng., 2020, Advance Article
Article type
Paper

In situ synthesis of gold nanoparticles in polymer films under concentrated sunlight: control of nanoparticle size and shape with solar flux

E. Nadal, N. Barros, L. Peres, V. Goetz, M. Respaud, K. Soulantica and H. Kachachi, React. Chem. Eng., 2020, Advance Article , DOI: 10.1039/C9RE00439D

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