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Size-Dependent Composition and Molar Extinction Coefficient of PbSe Semiconductor Nanocrystals
Abstract
Atomic compositions and molar extinction coefficients of PbSe semiconductor nanocrystals were determined by atomic absorption spectrometry, UV-vis-NIR spectrophotometry, and transmission electron microscopy. The Pb/Se atomic ratio was found to be size-dependent with a systematic excess of Pb atoms in the PbSe nanocrystal system. Experimental results indicated that the individual PbSe nanocrystal was nonstoichiometric, consisting of a PbSe core and an extra layer of Pb atoms. For these nonstoichiometric PbSe semiconductor nanocrystals, we proposed a new computational approach to calculate the total number of Pb and Se atoms in different sized particles. This calculation played a key role on the accurate determination of the strongly size-dependent extinction coefficient, which followed a power law with an exponent of approximately 2.5.
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Weissleder, R. (2001) · Nature Biotechnology · doi:10.1038/86684 · Cited by 3,839
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Anderson, N. C., Hendricks, M. P., Choi, J. J., & Owen, J. S. (2013) · Journal of the American Chemical Society · doi:10.1021/ja4086758 · Cited by 874
Tang, J., Brzozowski, L., Barkhouse, D. A. R., Wang, X., Debnath, R., Wolowiec, R., Palmiano, E., Levina, L., Pattantyus-Abraham, A. G., Jamakosmanovic, D., et al. (2010) · ACS Nano · doi:10.1021/nn901564q · Cited by 392
Predicting Nanocrystal Shape through Consideration of Surface-Ligand Interactions
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Metadata
- Authors
- Dai, Q., Wang, Y., Li, X., Zhang, Y., Pellegrino, D. J., Zhao, M., Zou, B., Seo, J., Wang, Y., & Yu, W. W.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-05-12
- Volume
- 3
- Issue
- 6
- Pages
- 1518-1524
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2006926470
- Cited by
- 212
- References
- 1
- FWCI
- 9.41
- Type
- journal article
- Language
- en
- Open access
- closed
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