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Two-Dimensional Van der Waals Heterostructures for Synergistically Improved Surface-Enhanced Raman Spectroscopy

journal contribution
posted on 13.05.2020, 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 Li
Surface-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 Interfaces

Volume

12

Issue

19

Pagination

21985 - 21991

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

1944-8244

eISSN

1944-8252

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2020, American Chemical Society