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Gold nanoparticles combined with ultrafine TiO2 layer: a reliable probe for Raman thermometry.

Amine Khitous1,2, Céline Molinaro1,2, Anna Rumyantseva3,4

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Researchers developed novel gold nanoparticle (AuNP) probes coated with titanium dioxide (TiO2) for accurate temperature measurements. These probes offer reliable Raman thermometry across a wide temperature range, crucial for understanding energy dynamics.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Spectroscopy

Background:

  • Accurate temperature determination in metal nanoparticles is critical for understanding energy dissipation.
  • Existing thermometry techniques often lack the necessary performance for sensitive applications.
  • High-performance thermometry is needed for studying energy dynamics in nanomaterials.

Purpose of the Study:

  • To develop efficient probes for Raman anti-Stokes/Stokes thermometry.
  • To utilize gold nanoparticles (AuNPs) functionalized with titanium dioxide (TiO2) for thermometry.
  • To establish a reliable temperature measurement method over an extended range.

Main Methods:

  • Preparation of gold nanoparticles (AuNPs) via thermal dewetting.
  • Functionalization of AuNPs with a 2 nm TiO2 layer using the sol-gel method.
  • Validation of Raman thermometry by accounting for spectrometer spectral efficiency and AuNPs@TiO2 extinction properties.

Main Results:

  • Developed AuNPs@TiO2 probes demonstrated good stability.
  • The probes showed a usable response in the temperature range of 25 °C to 240 °C.
  • External thermal and thermoplasmonic heating were employed to test the probes.

Conclusions:

  • The proposed Raman thermometry approach using AuNPs@TiO2 is reliable.
  • This method allows for accurate temperature measurements over a range exceeding 200 degrees.
  • The developed probes are suitable for temperature-sensitive applications and energy dissipation studies.