What is it about?
We observed the shifts in the optical spectra of gold nanoparticles in the presence of different organic vapours (ethanol, 2-propanol, and toluene). We showed that the sensing properties of gold nanoparticles can be tuned with a corrugated graphene overlayer.
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Why is it important?
We apply a graphene overlayer on top of gold nanoparticles. The graphene becomes corrugated by annealing the graphene/gold nanoparticle system at moderate temperatures. The use of such rippled graphene is beneficial in terms of chemical activity, as the crests and troughs of graphene ripples can form active sites for the adsorption of different molecules. We show that the corrugated graphene overlayer can improve both the sensitivity and selectivity of the optical detection.
Perspectives
Using a corrugated graphene overlayer to enhance the vapour sensing with gold nanoparticles is only one step. Introducing point defects and/or functionalizing the graphene overlayer can further improve the sensing properties of graphene-covered plasmonic nanoparticles.
Dr. Zoltán Osváth
MTA Centre for Energy Research (EK), Institute of Technical Physics and Materials Science (MFA)
Read the Original
This page is a summary of: Vapour sensing properties of graphene-covered gold nanoparticles, Nanoscale Advances, January 2019, Royal Society of Chemistry,
DOI: 10.1039/c9na00110g.
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