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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Updated: Jul 19, 2025

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Ultrasensitive Photothermal Spectroscopy: Harnessing the Seebeck Effect for Attogram-Level Detection.

Yaoli Zhao1, Patatri Chakraborty1, Ali Passian2

  • 1Chemical and Biological Engineering, University at Buffalo, Buffalo, New York 14260, United States.

Nano Letters
|August 14, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel photothermal spectroscopy technique for highly selective chemical sensing. The method achieves attogram detection limits for surface-adsorbed molecules using a nanoscale thermocouple sensor.

Keywords:
calorimetryinfrared sensormicrofabricated thermocouplemolecular recognitionphotothermal spectroscopy

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nanotechnology

Background:

  • Molecular-level spectroscopy is vital for sensing and imaging.
  • Detecting and quantifying trace amounts of surface-adsorbed chemicals is challenging.
  • Existing methods often lack the sensitivity for ultra-low concentrations.

Purpose of the Study:

  • To develop a highly selective spectroscopic technique for detecting minuscule quantities of surface-adsorbed chemicals.
  • To achieve an attogram detection limit for adsorbates.
  • To demonstrate the capability of the technique for various molecules and polymers.

Main Methods:

  • Utilized a photothermal spectroscopic technique.
  • Employed a microfabricated nanoscale thermocouple junction integrated into a microcantilever apex.
  • Leveraged the Seebeck effect for signal generation.
  • Exploited nonradiative decay of molecular vibrational states for photothermal signal.

Main Results:

  • Achieved high selectivity sensing of adsorbates.
  • Demonstrated an attogram (10^-18 g) detection limit.
  • Successfully detected photothermal spectra of physisorbed trinitrotoluene (TNT) and dimethyl methylphosphonate (DMMP) molecules.
  • Showcased detection of representative polymers.

Conclusions:

  • The developed photothermal spectroscopic technique offers unprecedented sensitivity for detecting trace adsorbates.
  • The sensor's minimal thermal mass and exceptional thermal insulation contribute to its high performance.
  • This technique has significant potential for applications in chemical sensing, environmental monitoring, and security screening.