Phase Transformation on Multilayer 2M-WS<sub>2</sub> for Improved Surface-enhanced Raman Scattering

Guan, Yanchao; Chen, Mengxin; Ding, Ye; Fang, Yuqiang; Huang, Fuqiang; Xu, Cheng-Yan; Zhen, Liang; Li, Yang; Yang, Lijun; Xu, Ping

doi:10.1021/acsnano.4c06303

ACS Nano

2024

DOI: 10.1021/acsnano.4c06303

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Phase Transformation on Multilayer 2M-WS₂ for Improved Surface-enhanced Raman Scattering

Yanchao Guan,

Mengxin Chen,

Ye Ding

et al.

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The Design of WTe₂/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

Sun,

Wu,

et al. 2024

Nano Lett.

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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 2 /graphene/Ag nanoparticles (WTe 2 /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 2 /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 2 . The enhancement factor of the WTe 2 /Gr/Ag substrate finally reached 1.34 × 10 12 . This work proposes a new idea for the design of highly sensitive SERS sensors.

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The Design of WTe₂/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

Sun,

Wu,

et al. 2024

Nano Lett.

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Phase Transformation on Two-Dimensional MoTe2 Films for Surface-Enhanced Raman Spectroscopy

Zhao,

Huang

2024

Molecules

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Two-dimensional (2D) transition metal dichalcogenides (TMDs) have recently become attractive candidate substrates for surface-enhanced Raman spectroscopy (SERS) owing to their atomically flat surfaces and adjustable electronic properties. Herein, large-scale 2D 1T′- and 2H-MoTe2 films were prepared using a chemical vapor deposition method. We found that phase structure plays an important role in the enhancement of the SERS performances of MoTe2 films. 1T′-MoTe2 films showed a strong SERS effect with a detection limit of 1 × 10−9 M for the R6G molecule, which is one order of magnitude lower than that of 2H-MoTe2 films. We demonstrated that the SERS sensitivity of MoTe2 films is derived from the efficient photoinduced charge transfer process between MoTe2 and adsorbed molecules. Moreover, a prohibited fish drug could be detected by using 1T′-MoTe2 films as SERS substrates. Our study paves the way to the development and application of high-performance SERS substrates based on TMD phase engineering.

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Phase Transformation on Multilayer 2M-WS₂ for Improved Surface-enhanced Raman Scattering

Cited by 2 publications

References 38 publications

The Design of WTe₂/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

The Design of WTe₂/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

Phase Transformation on Two-Dimensional MoTe2 Films for Surface-Enhanced Raman Spectroscopy

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Phase Transformation on Multilayer 2M-WS2 for Improved Surface-enhanced Raman Scattering

Cited by 2 publications

References 38 publications

The Design of WTe2/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

The Design of WTe2/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

Phase Transformation on Two-Dimensional MoTe2 Films for Surface-Enhanced Raman Spectroscopy

Contact Info

Product

Resources

About

Phase Transformation on Multilayer 2M-WS₂ for Improved Surface-enhanced Raman Scattering

The Design of WTe₂/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

The Design of WTe₂/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS