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Proceedings Paper

Spontaneous transition and concomitant self-assembly of CdTe nanoparticles into CdS nanosheets induced by L-cysteine
Author(s): Dawei Deng; Yueqing Gu
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Paper Abstract

In this paper, we investigated carefully the influence of the added L-cysteine on the stability of mercaptopropionic acid (MPA)-stabilized CdTe nanoparticles (NPs). Transmission electron microscopy (TEM) imaging revealed that the addition of pH ~11.5 L-cysteine solution could reduce the stability of MPA-capped CdTe NPs, which resulted in the formation of sheet-shaped nanostructures finally after about seven days of storage in darkness under ambient conditions. The typical size of these resulting nanosheets was ~6 μm in length, ~1 μm in width and ~50 nm in thickness. The high-resolution TEM characterization and elemental analysis from energy-dispersed X-ray (EDX) spectrum indicated that these resulting sheets were made from well-crystallized nanopartilces (~4 nm) of CdS rather than CdTe. In addition, XRD analysis and optical microscopy also supported further these experimental observations. Hence, here, the post addition of L-cysteine induced the spontaneous transition and concomitant self-assembly of MPA-stabilized CdTe nanoparticles into luminescent CdS nanosheets.

Paper Details

Date Published: 2 March 2009
PDF: 12 pages
Proc. SPIE 7190, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications, 719017 (2 March 2009); doi: 10.1117/12.807358
Show Author Affiliations
Dawei Deng, China Pharmaceutical Univ. (China)
Yueqing Gu, China Pharmaceutical Univ. (China)

Published in SPIE Proceedings Vol. 7190:
Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications
Samuel Achilefu; Ramesh Raghavachari, Editor(s)

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