An optical gas sensor was prepared by depositing graphene oxide flakes over a monolayer of gold nanoparticles, chemically attached to a functionalized fused silica substrate. The coupling between flakes and nanoparticles lead to optical changes upon exposure to different gases: in particular, we observed a shift of the surface plasmon resonance band in presence of both reducing and oxidizing gases. This effect can be explained in terms of a strong gold-graphene interaction and specifically of electron transfer between the gold nanopartides and the two-dimensional sheet of the sp2-hybridized carbons of graphene oxide. (C) 2013 Elsevier Ltd. All rights reserved.
Graphene oxide coupled with gold nanoparticles for localized surface plasmon resonance based gas sensor
Ottaviano Luca;
2014
Abstract
An optical gas sensor was prepared by depositing graphene oxide flakes over a monolayer of gold nanoparticles, chemically attached to a functionalized fused silica substrate. The coupling between flakes and nanoparticles lead to optical changes upon exposure to different gases: in particular, we observed a shift of the surface plasmon resonance band in presence of both reducing and oxidizing gases. This effect can be explained in terms of a strong gold-graphene interaction and specifically of electron transfer between the gold nanopartides and the two-dimensional sheet of the sp2-hybridized carbons of graphene oxide. (C) 2013 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
