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Magic Family of Discretly Sized Ultrabright Si Nanoparticles

Published online by Cambridge University Press:  15 March 2011

G. Belomoin ,
J. Therrien ,
A. Smith ,
S. Rao ,
R. Twesten ,
S. Chaieb ,
M. H. Nayfeh ,
L. Wagner  and
L. Mitas
G. Belomoin
Affiliation:
Department of Physics and Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801, USA
J. Therrien
Affiliation:
Department of Physics and Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801, USA
A. Smith
Affiliation:
Department of Physics and Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801, USA
S. Rao
Affiliation:
Department of Physics and Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801, USA
R. Twesten
Affiliation:
Department of Physics and Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801, USA
S. Chaieb
Affiliation:
Department of Physics and Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801, USA
M. H. Nayfeh
Affiliation:
Department of Physics and Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801, USA
L. Wagner
Affiliation:
Department of Physics, North Carolina State University, 127 Stinson Rd., Raleigh, NC 27695
L. Mitas
Affiliation:
Department of Physics, North Carolina State University, 127 Stinson Rd., Raleigh, NC 27695
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Abstract

We describe a procedure for dispersion bulk Si into a family discretely sized ultrasmall ultrabright nanoparticles. We demonstrate that electrochemically etched, hydrogen capped SinHx clusters with n larger than 20 are obtained within a family of discrete sizes. These sizes are 1.0 (Si29), 1.67 (Si123), 2.15, 2.9, and 3.7 nm diameter. We characterize the particles via direct electron imaging, excitation and emission optical spectroscopy, chromatography, and colloidal crystallization. The band gaps and emission bands are measured. The smallest four are ultrabright blue, green, yellow, and red luminescent particles. The availability of discrete sizes and distinct emission in the red, green and blue range is useful for biomedical tagging, RGB displays, and flash memories.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V11.4
Copyright
Copyright © Materials Research Society 2002

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References

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