4.8 Article

Flexible Two-Dimensional Vanadium Carbide MXene-Based Membranes with Ultra-Rapid Molecular Enrichment for Surface-Enhanced Raman Scattering

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 35, Pages 40427-40436

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c10800

Keywords

vanadium carbides; MXenes; photoinduced charge transfer; surface-enhanced Raman scattering; molecular enrichment

Funding

  1. National Natural Science Foundation of China [11874108]
  2. Fundamental Research Funds for the Central Universities [2242021R41069, 2242022k30008]
  3. China Postdoctoral Science Foundation [2021M700773]
  4. Jiangsu Planned Projects for Postdoctoral Research Funds [2021K509C]
  5. Anhui University of Science and Technology High -Level Introduction of Talents Research Fund

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This study proposes highly sensitive MXene-based SERS membranes by integrating a 2D downsizing strategy with molecular enrichment approaches. Two types of 2D vanadium carbide MXenes are demonstrated for ultrasensitive SERS sensing, and the performance can be further improved by vacuum-assisted filtration, enabling rapid molecular enrichment and high sensitivity detection.
Two-dimensional (2D) MXene materials have attracted broad interest in surface-enhanced Raman scattering (SERS) applications by virtue of their abundant surface terminations and excellent photoelectric properties. Herein, we propose to design highly sensitive MXene-based SERS membranes by integrating a 2D downsizing strategy with molecular enrichment approaches. Two types of 2D vanadium carbide (V4C3 and V2C) MXenes are demonstrated for ultrasensitive SERS sensing, and corresponding SERS mechanisms including the effect of 2D vanadium carbide thickness on their electron density states and interfacial photoinduced charge transfer resonance were discussed. A 2D downsizing strategy authorizes nonplasmonic SERS detection with a sensitivity of 1 X 10-7 M. Moreover, the performance can be further upgraded by vacuum-assisted filtration, which enables an ultrarapid molecular enrichment (within 2 min), ultrahigh molecular removal rate (over 95%), and improved sensitivity (5 X 10-9 M). This work may shed light on the MXene-based materials as an innovative platform for nonplasmonic SERS detection.

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