Share Email Print

Proceedings Paper

Spontaneous transition and concomitant self-assembly of CdTe nanoparticles into CdS nanosheets induced by L-cysteine
Author(s): Dawei Deng; Yueqing Gu
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

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: 3 March 2009
PDF: 12 pages
Proc. SPIE 7190, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications, 719017 (3 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)

© SPIE. Terms of Use
Back to Top