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Thermometries for Single Nanoparticles Heated with Light.

Luciana P Martinez1, M Cristina Mina Villarreal2, Cecilia Zaza3

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Summary

Measuring nanoscale heat fields from light-absorbing nanoparticles is challenging. This review categorizes existing thermometry methods for single nanoparticles and explores future directions for nanoscale temperature mapping.

Keywords:
nanoscale temperature mapnanothermometry validationphotothermal responsesingle particle temperaturethermoplasmonics

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physics

Background:

  • Nanoscale photon absorbers, like plasmonic and dielectric nanostructures, enable light-controlled heat release.
  • Applications span materials science and biology, but precise thermal field measurement is lacking.
  • Understanding nanoscale photothermal phenomena requires effective thermometry.

Purpose of the Study:

  • To review and discuss existing thermometry techniques for single nanoparticles under illumination.
  • To categorize these methods based on their temperature measurement region.
  • To explore future strategies for nanoscale temperature mapping and result validation.

Main Methods:

  • Classification of thermometry methods into four categories based on measurement location: diffraction-limited volume, nanoparticle vicinity, nanoparticle temperature, and nanoscale spatial resolution.
  • Discussion of challenges and potential new technology combinations for nanoscale temperature mapping.
  • Analysis of strategies for validating thermometry results.

Main Results:

  • Existing thermometry methods are categorized by their spatial resolution and measurement area.
  • Nanoscale temperature mapping is identified as the most challenging yet informative approach.
  • Validation strategies for thermometry data are presented.

Conclusions:

  • Accurate measurement of nanoscale thermal fields is crucial for advancing photothermal nanomaterial applications.
  • Current thermometry methods offer varying levels of spatial resolution and information.
  • Further development in nanoscale thermometry, particularly for temperature mapping, is needed.