Controlled electrodeposition of gold on graphene: maximization of the defect-enhanced Raman scattering response

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

Abstract

A reliable method to prepare a surface-enhanced Raman scattering (SERS) active substrate is developed herein, by electrodeposition of gold nanoparticles (Au NPs) on defect-engineered, large area chemical vapour deposition graphene (GR). A plasma treatment strategy is used in order to engineer the structural defects on the basal plane of large area single-layer graphene. This defect-engineered Au functionalized GR, offers reproducible SERS signals over the large area GR surface. The Raman data, along with X-ray photoelectron spectroscopy and analysis of the water contact angle are used to rationalize the functionalization of the graphene layer. It is found that Au NPs functionalization of the “defect-engineered” graphene substrates permits detection of concentrations as low as 10 −16 m for the probe molecule Rhodamine B, which offers an outstanding molecular sensing ability. Interestingly, a Raman signal enhancement of up to ≈10 8 is achieved. Moreover, it is observed that GR effectively quenches the fluorescence background from the Au NPs and molecules due to the strong resonance energy transfer between Au NPs and GR. The results presented offer significant direction for the design and fabrication of ultra-sensitive SERS platforms, and also open up possibilities for novel applications of defect engineered graphene in biosensors, catalysis, and optoelectronic devices.

Details

Original languageEnglish
Article number1901555
Pages (from-to)1-10
Number of pages10
JournalSmall
Volume15
Issue number48
Early online date21 May 2019
Publication statusPublished - 1 Nov 2019

Keywords

  • graphene, plasma, defects, Raman spectroscopy