File(s) under permanent embargo
Two-Dimensional Van der Waals Heterostructures for Synergistically Improved Surface-Enhanced Raman Spectroscopy
journal contribution
posted on 2020-05-13, 00:00 authored by Qiran CaiQiran Cai, Wei Gan, Alexey FalinAlexey Falin, K Watanabe, T Taniguchi, J Zhuang, W Hao, S Huang, T Tao, Ying (Ian) ChenYing (Ian) Chen, Luhua LiLuhua LiSurface-enhanced Raman spectroscopy (SERS) is a precise and noninvasive analytical technique that is widely used in chemical analysis, environmental protection, food processing, pharmaceutics, and diagnostic biology. However, it is still a challenge to produce highly sensitive and reusable SERS substrates with a minimum fluorescence background. In this work, we propose the use of van der Waals heterostructures of two-dimensional materials to cover plasmonic metal nanoparticles to solve this challenge. The heterostructures of atomically thin boron nitride (BN) and graphene provide synergistic effects: (1) electrons could tunnel through the atomically thin BN, allowing the charge transfer between graphene and probe molecules to suppress the fluorescence background; (2) the SERS sensitivity is enhanced by graphene via a chemical enhancement mechanism in addition to an electromagnetic field mechanism; and (3) the atomically thin BN protects the underlying graphene and Ag nanoparticles from oxidation during heating for regeneration at 360 °C in the air so that the SERS substrates could be reused. These advances will facilitate wider applications of SERS especially on the detection of fluorescent molecules with higher sensitivity.
History
Journal
ACS Applied Materials and InterfacesVolume
12Issue
19Pagination
21985 - 21991Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
ISSN
1944-8244eISSN
1944-8252Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2020, American Chemical SocietyUsage metrics
Categories
No categories selectedKeywords
Science & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials Sciencevan der Waals heterostructuresurface-enhanced Raman spectroscopy (SERS)two-dimensional materialsfluorescence backgroundreusabilityBORON-NITRIDE NANOSHEETSGOLD NANOPARTICLESSINGLE-MOLECULEGRAPHENESERSSUBSTRATEOXIDATIONFLUORESCENCEEXCITATIONSCATTERING
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC