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Park, Hyesung
Low-Dimensional Materials & Energy Conversion Lab
Research Interests
  • Nano materials, renewable energy, optoelectronic devices

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Ultrasensitive Plasmon-Free Surface-Enhanced Raman Spectroscopy with Femtomolar Detection Limit from 2D van der Waals Heterostructure

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Title
Ultrasensitive Plasmon-Free Surface-Enhanced Raman Spectroscopy with Femtomolar Detection Limit from 2D van der Waals Heterostructure
Author
Seo, JihyungLee, JunghyunKim, YongchulKoo, DonghwanLee, GeunsikPark, Hyesung
Issue Date
2020-03
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.20, no.3, pp.1620 - 1630
Abstract
Two-dimensional (2D) materials have been promoted as an ideal platform for surface-enhanced Raman spectroscopy (SERS), as they mitigate the drawbacks of noble metal-based SERS substrates. However, the inferior limit of detection has limited the practical applicability of 2D material-based SERS substrates. Here, we synthesize uniform large-area ReOxSy thin films via solution-phase deposition without post-treatments and demonstrate a graphene/ReOxSy vertical heterostructure as an ultrasensitive SERS platform. The electronic structure of ReOxSy can be modulated by changing the oxygen concentration in the lattice structure, obtaining efficient complementary resonance effects between ReOxSy and the probe molecule. In addition, the oxygen atoms in the ReOxSy lattice generate a dipole moment on the thin- film surface, which increases the electron transition probability. These synergistic effects outstandingly enhance the Raman effect in the ReOxSy thin film. When ReOxSy forms a vertical heterostructure on a graphene as the SERS substrate, the enhanced charge-transfer and exciton resonances improve the limit of detection to the femtomolar level, while achieving remarkable flexibility, reproducibility, and operational stability. Our results provide important insights into 2D material-based ultrasensitive SERS based on chemical mechanisms.
URI
https://scholarworks.unist.ac.kr/handle/201301/32081
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.9b04645
DOI
10.1021/acs.nanolett.9b04645
ISSN
1530-6984
Appears in Collections:
PHY_Journal Papers
ECHE_Journal Papers
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