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Manipulating chemistry through nanoparticle morphology

Abstract

We demonstrate that the protonation chemistry of molecules adsorbed at nanometer distances from the surface of anisotropic gold nanoparticles can be manipulated through the effect of surface morphology on the proton density of an organic coating. Direct evidence of this remarkable effect was obtained by monitoring surface-enhanced Raman scattering (SERS) from mercaptobenzoic acid and 4-aminobenzenethiol molecules adsorbed on gold nanostars. By smoothing the initially sharp nanostar tips through a mild thermal treatment, changes were induced on protonation of the molecules, which can be observed through changes in the measured SERS spectra. These results shed light into the local chemical environment near anisotropic colloidal nanoparticles and open an alternative avenues to actively control chemistry through surface morphology.

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Publication details

The article was received on 09 Jul 2019, accepted on 05 Aug 2019 and first published on 07 Aug 2019


Article type: Communication
DOI: 10.1039/C9NH00456D
Nanoscale Horiz., 2019, Accepted Manuscript

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    Manipulating chemistry through nanoparticle morphology

    L. Litti, J. Reguera, F. J. García de Abajo, M. Meneghetti and L. M. Liz-Marzan, Nanoscale Horiz., 2019, Accepted Manuscript , DOI: 10.1039/C9NH00456D

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