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Photothermal Microscopy and Spectroscopy with Nanomechanical Resonators.

Robert G West1, Kostas Kanellopulos1, Silvan Schmid1

  • 1Institute of Sensor and Actuator Systems, TU Wien, Gusshausstrasse 27-29, 1040 Vienna, Austria.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|November 29, 2023
PubMed
Summary

Nanomechanical photothermal spectroscopy uses resonators as detectors to measure heat from substances. This technique offers high sensitivity for analyzing trace analytes and single molecules.

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Area of Science:

  • Nanotechnology
  • Spectroscopy
  • Materials Science

Background:

  • Nanomechanical resonators are highly sensitive thermal detectors.
  • Substances interacting with resonators induce measurable frequency shifts upon thermal relaxation.
  • This forms a self-measuring system for spectroscopic and microscopic analysis.

Purpose of the Study:

  • To introduce nanomechanical photothermal absorption spectroscopy and microscopy.
  • To highlight the capabilities of nanoresonator-analyte systems for sensitive detection.
  • To explore the versatility and applications of this technique.

Main Methods:

  • Utilizing suspended nanometer-thin ceramic or 2D material resonators.
  • Measuring localized heat exchanges from substances on or within the resonator.
  • Employing incoherent or coherent light for excitation and detection.
  • Leveraging nanoresonator resonance frequency shifts.

Main Results:

  • Demonstrated high sensitivity for trace analytes, single particles, and molecules.
  • Showcased the system's ability to act as a self-measuring spectrometer and microscope.
  • Confirmed response across the substance's absorption spectrum based on intensity.
  • Overcame limitations posed by thermostatistical fluctuation phenomena.

Conclusions:

  • Nanomechanical photothermal spectroscopy provides a versatile platform for sensitive chemical analysis.
  • The technique is adaptable for various sampling methods, including hydrated samples.
  • Potential applications span fingerprinting, separation science, and surface sciences.