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Related Concept Videos

Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...

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Studying the Effects of Temperature on the Nucleation and Growth of Nanoparticles by Liquid-Cell Transmission Electron Microscopy
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Size-dependent temperature effects on PbSe nanocrystals.

Quanqin Dai1, Yu Zhang, Yingnan Wang

  • 1Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 17, 2010
PubMed
Summary
This summary is machine-generated.

Temperature effects on lead selenide (PbSe) nanocrystal band gaps depend on size. This suggests PbSe nanocrystals could serve as sensitive temperature markers, with stable optical properties across a range of temperatures.

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Last Updated: Jun 12, 2026

Studying the Effects of Temperature on the Nucleation and Growth of Nanoparticles by Liquid-Cell Transmission Electron Microscopy
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Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model
06:54

Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model

Published on: August 22, 2015

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Lead selenide (PbSe) nanocrystals exhibit unique quantum confinement effects.
  • Understanding temperature-dependent optical properties is crucial for material applications.

Purpose of the Study:

  • To investigate the size-dependent variation of the band gap in PbSe nanocrystals with temperature.
  • To explore the potential of PbSe nanocrystals as temperature-sensitive materials.

Main Methods:

  • Synthesis and characterization of PbSe nanocrystals of varying sizes.
  • Temperature-dependent optical spectroscopy to measure band gap (E(g)) changes.
  • Analysis of temperature coefficients (dE(g)/dT) and molar extinction coefficients.

Main Results:

  • The band gap variation of PbSe nanocrystals with temperature is strongly size-dependent.
  • Temperature coefficients (dE(g)/dT) shift from negative to positive with increasing nanocrystal size.
  • Molar extinction coefficients remained constant between 25-120°C.

Conclusions:

  • PbSe nanocrystals demonstrate tunable temperature-dependent band gap behavior based on size.
  • These size-tunable properties indicate potential for PbSe nanocrystals as sensitive temperature markers.
  • Stable optical properties over a relevant temperature range support their use in sensing applications.