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Function-Customized Heterostructure for Boosting Semiconductor Surface-Enhanced Raman Scattering and Serving as a

Yimin Tang1,2, Rui Wang1, Wenxue Wang1

  • 1College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China.

ACS Nano
|November 4, 2025
PubMed
Summary
This summary is machine-generated.

A novel TiO2/Ti3C2 MXene heterojunction boosts semiconductor surface-enhanced Raman scattering (SERS) sensitivity to record levels. This advanced SERS matrix also functions as a platform for detecting and degrading pollutants.

Keywords:
0D/2D heterojunctionPPCPsSERSTiO2/Ti3C2 MXenemultifunctional platform

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Developing non-noble metal surface-enhanced Raman scattering (SERS) matrices is crucial for advanced sensing applications.
  • Semiconductor heterostructures offer potential for enhanced SERS performance through tailored functionalities.
  • Existing semiconductor SERS substrates often face limitations in sensitivity and multifunctionality.

Purpose of the Study:

  • To construct a 0D/2D TiO2/Ti3C2 MXene heterojunction for boosting semiconductor SERS.
  • To investigate the mechanisms behind SERS enhancement in the fabricated heterojunction.
  • To explore the potential of the TiO2/Ti3C2 matrix as a multifunctional platform for sensing and degradation.

Main Methods:

  • Fabrication of a 0D/2D TiO2/Ti3C2 MXene heterojunction.
  • Characterization using theoretical calculations and experimental validation.
  • Evaluation of SERS performance and photocatalytic activity.

Main Results:

  • Achieved a record SERS enhancement factor of 5.57 × 10^9, the highest for semiconductor substrates.
  • Demonstrated significant SERS enhancement attributed to hot electron excitation and efficient carrier separation.
  • Confirmed the matrix's capability for real-time monitoring of pharmaceuticals and personal care products (PPCPs) and their degradation.

Conclusions:

  • The TiO2/Ti3C2 heterojunction effectively enhances semiconductor SERS sensitivity via charge transfer mechanisms.
  • The developed matrix offers a promising multifunctional platform for ultrasensitive SERS detection and pollutant degradation.
  • This work provides a new strategy for designing advanced semiconductor SERS materials and multifunctional platforms.