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Constructing the Mo2C@MoOx Heterostructure for Improved SERS Application.

Kui Lai1,2, Kaibo Yuan2, Qinli Ye2

  • 1The Research Institute of Advanced Technologies, Ningbo University, No. 818 Fenghua Road, Ningbo 315211, China.

Biosensors
|February 24, 2022
PubMed
Summary
This summary is machine-generated.

A novel molybdenum carbide/molybdenum oxide (Mo2C@MoOx) heterostructure demonstrates exceptional performance for surface-enhanced Raman scattering (SERS) detection. This non-noble metal substrate achieves high sensitivity for trace molecule analysis.

Keywords:
SERScharge transferheterojunctionsmolybdenum carbidemolybdenum oxide

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Surface-enhanced Raman scattering (SERS) offers high sensitivity for detecting trace molecules.
  • Developing non-noble metal SERS substrates with excellent enhancement and stability is crucial for advanced applications.
  • Molybdenum-based materials show potential for SERS applications.

Purpose of the Study:

  • To construct a novel molybdenum carbide/molybdenum oxide (Mo2C@MoOx) heterostructure for SERS.
  • To investigate the charge transfer mechanism enhancing SERS performance.
  • To evaluate the substrate's sensitivity and stability for biomolecule detection.

Main Methods:

  • Synthesis of Mo2C via calcination of ammonium molybdate tetrahydrate and gelatin in argon.
  • Formation of Mo2C@MoOx heterostructure by annealing Mo2C in air.
  • SERS performance evaluation using a 532 nm laser and Rhodamine 6G (R6G) as a reporter molecule.
  • Characterization using High-Resolution Transmission Electron Microscopy (HRTEM) and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

  • Achieved a high Raman enhancement factor (EF) of 1.445 × 10^8 for R6G at 10^-8 M.
  • Demonstrated a limit of detection (LOD) of 10^-8 M for R6G.
  • Identified the formation of metal-semiconductor mixing energy bands in the heterojunction.
  • Revealed that charge transfer, specifically hot electron transfer from Mo2C to MoOx and then to molecules, enhances the SERS signal.

Conclusions:

  • The Mo2C@MoOx heterostructure serves as an effective non-noble metal SERS substrate.
  • The enhanced SERS performance is attributed to efficient charge transfer facilitated by the heterojunction.
  • This material holds promise for sensitive and stable trace molecule detection in various analytical applications.