The Design of WTe<sub>2</sub>/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS
Combining the advantages of metal and two-dimensional (2D) nanomaterials, various 2D/metal composite structures are proposed as surface-enhanced Raman spectroscopy (SERS) substrates. However, the chemical enhancement in the composite structure is usually less responsible for the total enhancement. In this work, we proposed a heterostructure including WTe<sub>2</sub>/graphene/Ag nanoparticles (WTe<sub>2</sub>/Gr/Ag) as an effective platform for SERS. The matching of energy levels facilitates charge transfer (CT) within the composite structure, which in turn significantly improves the chemical enhancement of SERS. Compared with WTe<sub>2</sub>/Ag or Gr/Ag substrate, the SERS signals can be amplified up to 18-fold, and the detection limit could further reduce 3 orders of magnitude. Furthermore, the CT process in the SERS test can be further promoted after introducing the pyroelectric field based on the ferro-electricity of WTe<sub>2</sub>. The enhancement factor of the WTe<sub>2</sub>/Gr/Ag substrate finally reached 1.34 × 10<sup>12</sup>. This work proposes a new idea for the design of highly sensitive SERS sensors.
Authors
- Chonghui Li (ORCID: https://orcid.org/0000-0003-0863-1328)
- Baoyuan Man (ORCID: https://orcid.org/0000-0002-4993-5291)
- Heqi Ma
- Zhen Li (ORCID: https://orcid.org/0000-0002-6820-4187)
- Chao Zhang (ORCID: https://orcid.org/0000-0002-3295-8980)
- Cheng Yang (ORCID: https://orcid.org/0000-0001-7428-1819)
- Tianyu Sun (ORCID: https://orcid.org/0009-0008-8270-8702)
- Yang Wu
Institutions
- Shandong Normal University (CN)
- Institute of Biophysics (CN)
- Institute of Biophysics (BG)
- Dezhou University (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-11-20
- DOI
- https://doi.org/10.1021/acs.nanolett.4c04339
- Citations
- 23
- Primary Topic
- Gold and Silver Nanoparticles Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.71