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Enhanced Surface Plasmon by Clusters in TiO2-Ag Composite.

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  • 1School of Material and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.

Materials (Basel, Switzerland)
|November 11, 2022
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Summary

Researchers developed novel TiO2 and Ag nanocap arrays for enhanced Surface-Enhanced Raman Scattering (SERS). This composite material enables highly sensitive detection of thiram, paving the way for advanced sensing applications.

Keywords:
SERSTiO2-Ag compositenanocaps decorated by clusters

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Surface plasmons in noble metal-semiconductor composites offer unique charge properties and diverse applications.
  • Ordered nanostructures are crucial for controlling electromagnetic field interactions and enhancing optical phenomena.

Purpose of the Study:

  • To fabricate ordered composite nanocap arrays of TiO2 and Ag.
  • To investigate the effect of sputtering power on surface morphology and SERS activity.
  • To achieve sensitive detection of thiram using the developed SERS-active substrate.

Main Methods:

  • Fabrication of ordered 2D polystyrene spheres array template.
  • Co-sputtering technique to deposit TiO2 and Ag.
  • Tuning surface morphology by varying TiO2 sputtering power.
  • Surface-Enhanced Raman Scattering (SERS) measurements.
  • Finite-difference time-domain (FDTD) simulations.

Main Results:

  • Ordered composite nanocap arrays of TiO2 and Ag were successfully prepared.
  • Surface morphology, specifically nanocap decoration with clusters, was controlled by TiO2 sputtering power.
  • Composite clusters significantly enhanced local electromagnetic field coupling, leading to strong SERS signals.
  • Accurate detection of thiram down to 10^-9 M was achieved with the optimized substrate.

Conclusions:

  • The composite nanocap arrays with decorated clusters exhibit excellent SERS activity.
  • The developed SERS-active substrate demonstrates high sensitivity and accuracy for thiram detection.
  • This work highlights the potential of tailored noble metal-semiconductor nanostructures for advanced sensing platforms.