Synthesis of Near-Infrared-Emitting, Water-Soluble CdTeSe/CdZnS Core/Shell Quantum Dots

Applications of near-infrared (NIR) emitting CdTe-based QDs have been hampered by their sensitivity to oxidation. Here, we describe a synthetic method for the growth of CdTeSe/CdZnS core/shell QDs emitting in the NIR range (700−800 nm). We first synthesize high-quantum-yield zinc-blende CdTeSe cores...

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Bibliographic Details
Published in:Chemistry of materials 2009-04, Vol.21 (8), p.1418-1424
Main Authors: Pons, Thomas, Lequeux, Nicolas, Mahler, Benoit, Sasnouski, Siarhei, Fragola, Alexandra, Dubertret, Benoit
Format: Article
Language:English
Subjects:
Nanomaterials (Nanops, Nanotubes, etc.)
Optical Materials (including Non-Linear Optic, Photonic, and Optoelectronic Materials)
Semiconductors
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Summary:Applications of near-infrared (NIR) emitting CdTe-based QDs have been hampered by their sensitivity to oxidation. Here, we describe a synthetic method for the growth of CdTeSe/CdZnS core/shell QDs emitting in the NIR range (700−800 nm). We first synthesize high-quantum-yield zinc-blende CdTeSe cores with gradient composition and tunable emission up to 800 nm. The CdZnS shell growth is performed with cadmium and zinc carboxylate and trioctylphosphine sulfur precursors in trioctylamine solvent, and yields thick shell with controlled zinc blende crystalline structure. The presence of a high-band-gap, oxidation-resistant shell considerably improves the quantum yield and stability of these QDs when solubilized in saline buffers, making them promising fluorescence probes for NIR biological imaging.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm8027127