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Photon and Electron Beam Induced Phase Transformations in CDS Nanocrystals

Published online by Cambridge University Press:  02 July 2020

M. Gajdardziska-Josifovska ,
V. Lazarov ,
J. Reynolds  and
V. V. Yakovlev
M. Gajdardziska-Josifovska
Affiliation:
Department of Physics, University of Wisconsin Milwaukee, P. O. Box 413, Milwaukee, WI53201
V. Lazarov
Affiliation:
Department of Physics, University of Wisconsin Milwaukee, P. O. Box 413, Milwaukee, WI53201
J. Reynolds
Affiliation:
Department of Physics, University of Wisconsin Milwaukee, P. O. Box 413, Milwaukee, WI53201
V. V. Yakovlev
Affiliation:
Department of Physics, University of Wisconsin Milwaukee, P. O. Box 413, Milwaukee, WI53201
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Extract

One of the great challenges of nanotechnology is how to produce and modify objects at nanoscale dimensions. The search for physical and chemical methods for controlled synthesis, modification and characterization of semiconductor nanocrystals is of special interest due to their novel electronic and optical properties. Recently we have achieved the first laser-induced phase transformation in semiconductor nanocrystals [1], irradiating colloidal solutions of CdS nanocrystals with 7 ns pulses of 532 nm wavelength. We used established wet-chemistry methods to synthesize the CdS nanocrystals, and a combination of electron microscopy methods to determine the structure, size and composition of the nanocrystals. In the present paper we report a wavelength dependence of the laser-induced phase transformations in CdS. We also explore electron-induced transformations in comparison with their photon counterparts.

Aqueous colloidal solutions of CdS nanocrystals were prepared by mixing of CdCl2 with Na2S in the presence of Sodium Mercaptoacetate and HC1 [2].

Type
Sir John Meurig Thomas Symposium: Microscopy and Microanalysis in the Chemical Sciences
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 18 - 19
Copyright
Copyright © Microscopy Society of America

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References

1. Yakovlev, V. V., Lazarov, V., Reynolds, J. and Gajdardziska-Josifovska, M., Appl. Phys. Lett., in press.Google Scholar

2. Zhang, J. Z., Ace. Chem. Res. 30 (1997) 423.CrossRefGoogle Scholar

3. Vossmeyer, T. et al. J. Phys. Chem. 98 (1994) 7665.CrossRefGoogle Scholar

4. Supported under NSF-DMR Grant No. 9553148 and ACS-PRF Grant No. 34396-G5.Google Scholar