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Proceedings Article

Compact and highly stable quantum dots through optimized aqueous phase transfer

[+] Author Affiliations
Sudarsan Tamang, Peter Reiss

CEA-CNRS, Univ. Joseph Fourier (France)

Grégory Beaune

CEA-CNRS, Univ. Joseph Fourier (France) and CEA-Grenoble, LETI-DTBS (France)

Cathy Poillot, Michel De Waard

INSERM, Univ. Joseph Fourier (France)

Isabelle Texier-Nogues

CEA-Grenoble, LETI-DTBS (France)

Proc. SPIE 7909, Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI, 79091B (February 11, 2011); doi:10.1117/12.873805
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From Conference Volume 7909

  • Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI
  • Wolfgang J. Parak; Kenji Yamamoto; Marek Osinski
  • San Francisco, California, USA | January 22, 2011

abstract

A large number of different approaches for the aqueous phase transfer of quantum dots have been proposed. Surface ligand exchange with small hydrophilic thiols, such as L-cysteine, yields the lowest particle hydrodynamic diameter. However, cysteine is prone to dimer formation, which limits colloidal stability. We demonstrate that precise pH control during aqueous phase transfer dramatically increases the colloidal stability of InP/ZnS quantum dots. Various bifunctional thiols have been applied. The formation of disulfides, strongly diminishing the fluorescence QY has been prevented through addition of appropriate reducing agents. Bright InP/ZnS quantum dots with a hydrodynamic diameter <10 nm and long-term stability have been obtained. Finally we present in vitro studies of the quantum dots functionalized with the cell-penetrating peptide maurocalcine.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Sudarsan Tamang ; Grégory Beaune ; Cathy Poillot ; Michel De Waard ; Isabelle Texier-Nogues, et al.
"Compact and highly stable quantum dots through optimized aqueous phase transfer", Proc. SPIE 7909, Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI, 79091B (February 11, 2011); doi:10.1117/12.873805; http://dx.doi.org/10.1117/12.873805


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