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TiO2 compact layer induced charge transfer enhancement in a three-dimensional TiO2-Ag array SERS substrate for

Zhuang Ding1, Yaru Wang1, Wanpeng Zhou1

  • 1School of Chemistry and Chemical Engineering, Hefei University of Technology 193 Tunxi Road Hefei 230009 China mfzhang@hfut.edu.cn.

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A novel three-dimensional titanium dioxide-silver (TiO2-Ag) surface-enhanced Raman scattering (SERS) substrate offers high sensitivity and uniformity for reliable quantitative analysis of chemical compounds and pesticide residues.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Highly sensitive and uniform surface-enhanced Raman scattering (SERS) substrates are crucial for reliable quantitative analysis.
  • Existing SERS substrates often face challenges in sensitivity, uniformity, and practical application for complex samples.

Purpose of the Study:

  • To develop a three-dimensional TiO2-Ag SERS substrate with enhanced sensitivity, uniformity, and quantitative detection capabilities.
  • To evaluate the substrate's performance in detecting model analytes and real-world pesticide residues.

Main Methods:

  • Fabrication of a 3D TiO2 nanorod array on a compact TiO2 layer, followed by silver nanoparticle (AgNP) modification.
  • Characterization of the substrate's structural and SERS properties.
  • Quantitative detection of crystal violet (CV) and various organic pesticides using the developed substrate and a portable Raman instrument.

Main Results:

  • The TiO2-Ag substrate demonstrated synergistic effects between the compact TiO2 layer, TiO2 nanorods, and AgNPs, leading to high sensitivity.
  • The compact TiO2 layer effectively suppressed electron-hole recombination, enhancing charge transfer.
  • Achieved a limit of detection (LOD) of 10^-9 M for CV and LODs of 10^-7 M to 10^-6 M for pesticides (thiram, triazophos, fonofos).
  • Successfully simulated the detection of pesticide residues in a real dendrobium sample.

Conclusions:

  • The developed 3D TiO2-Ag hybrid array SERS substrate exhibits excellent sensitivity, uniformity, and quantitative detection capabilities.
  • The substrate shows significant potential for the rapid and reliable detection of pesticide residues in various real-world samples.
  • The integration of semiconductor and plasmonic nanomaterials offers a promising strategy for advanced SERS applications.