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Erni R, Browning ND. Quantification of the size-dependent energy gap of individual CdSe quantum dots by valence electron energy-loss spectroscopy. Ultramicroscopy. 2006;107(2):267-73doi: 10.1016/j.ultramic.2006.08.002.
Erni, R., & Browning, N. D. (2007). Quantification of the size-dependent energy gap of individual CdSe quantum dots by valence electron energy-loss spectroscopy. Ultramicroscopy, 107(2), 267-73. https://doi.org/10.1016/j.ultramic.2006.08.002
Erni, Rolf, and Browning, Nigel D. "Quantification of the size-dependent energy gap of individual CdSe quantum dots by valence electron energy-loss spectroscopy." Ultramicroscopy vol. 107,2 (2007): 267-73. doi: https://doi.org/10.1016/j.ultramic.2006.08.002
Erni R, Browning ND. Quantification of the size-dependent energy gap of individual CdSe quantum dots by valence electron energy-loss spectroscopy. Ultramicroscopy. 2007 Feb-Mar;107(2):267-73. doi: 10.1016/j.ultramic.2006.08.002. Epub 2006 Sep 07. PMID: 16996213.
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Ultramicroscopy. 2007 Feb-Mar;107(2):267-73. doi: 10.1016/j.ultramic.2006.08.002. Epub 2006 Sep 07.

Quantification of the size-dependent energy gap of individual CdSe quantum dots by valence electron energy-loss spectroscopy.

Ultramicroscopy

Rolf Erni, Nigel D Browning

Affiliations

  1. Department of Chemical Engineering and Materials Science, University of California Davis, One Shields Ave., Davis, CA 95616, USA. [email protected]

PMID: 16996213 DOI: 10.1016/j.ultramic.2006.08.002

Abstract

Valence electron energy-loss spectroscopy (VEELS) performed in a monochromated scanning transmission electron microscope was used to measure the energy gaps of individual quantum dots (QDs). The gap energies of a series of CdSe QDs measured by VEELS reveal the expected quantum confinement effect; the gap energy increases with decreasing particle size. However, the values derived from these first VEELS measurements of single QDs are larger than the values commonly measured by optical spectroscopy. As standard optical methods lack the spatial resolution to probe individual nanoparticles, the particle-size distribution influences the optical response. It is suggested that the impact of the particle-size distribution accounts for the discrepancy between the energy-gap values derived from VEELS of single QDs and from optical methods of ensembles of QDs.

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