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Studying the Effects of Temperature on the Nucleation and Growth of Nanoparticles by Liquid-Cell Transmission Electron Microscopy
Published on: February 17, 2021
Comment on 'Temperature dependent optical properties of PbS nanocrystals'
B Ullrich1, J S Wang, G J Brown
1Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright Patterson AFB, OH 45433-7707, USA. bruno@fis.unam.mx
Nanotechnology
|June 25, 2013
Summary
This study corrects erroneous claims regarding the temperature dependence of lead sulfide (PbS) quantum dot photoluminescence and absorption. We clarify the accuracy of our fitting expression and refute claims of temperature-invariant Stokes shift.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Physics
Background:
- Previous research by Nordin et al. (2012) questioned the validity of an expression used by Ullrich et al. (2011).
- Nordin et al. also misrepresented Ullrich et al.'s findings regarding the temperature invariance of the Stokes shift in PbS quantum dots.
Purpose of the Study:
- To refute erroneous statements made by Nordin et al. concerning PbS quantum dots.
- To validate the expression used for fitting the temperature dependence of photoluminescence and absorption.
- To correct the misinterpretation of the temperature dependence of the Stokes shift.
Main Methods:
- Analysis of photoluminescence and absorption data for PbS quantum dots.
- Re-evaluation of the fitting expression for temperature dependence.
- Directly addressing and correcting cited inaccuracies.
Main Results:
- The expression used by Ullrich et al. is demonstrated to be adequate for fitting the temperature dependence of PbS quantum dot properties.
- The claim of temperature invariance of the Stokes shift is shown to be a misrepresentation of Ullrich et al.'s work.
Conclusions:
- The findings by Nordin et al. regarding the inadequacy of the fitting expression are erroneous.
- The Stokes shift in PbS quantum dots is not temperature-invariant, contrary to Nordin et al.'s misquote.
