Stabilization of (CdSe)ZnS quantum dots in water using amino acid capping groups

M. Jones, S. Y. Ding, M. P. Tucker, Y. H. Kim, S. B. Zhang, M. E. Himmel, G. Rumbles

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


We report investigations of the binding of amino acids to the surface of colloidal quantum dots that comprise a cadmium selenide core, with a zinc sulfide shell, (CdSe)ZnS. The goal of this work is to replace the TOP/TOPO capping group, created during synthesis, with amino acids that can confer solubility of the quantum dot in a buffered aqueous environment, while retaining or improving the good electronic properties of the quantum dot Steady-state and time-resolved photoluminescence studies, combined with quantum chemical calculations are used to explain the relative efficiency of three amino acids (histidine, lysine and cysteine) to bind and passivate the quantum dot surface as a function of pH. These results are compared to the more common mercaptopropionic acid that is often used to solubilize these QDs in water.

Original languageEnglish
Title of host publicationElectron Transfer in Nanomaterials - Proceedings of the International Symposium
Number of pages10
Publication statusPublished - Oct 16 2006
Event205th Electrochemical Society Meeting - San Antonio, TX, United States
Duration: May 9 2004May 14 2004

Publication series

NameProceedings - Electrochemical Society
VolumePV 2004-22


Other205th Electrochemical Society Meeting
CountryUnited States
CitySan Antonio, TX

ASJC Scopus subject areas

  • Engineering(all)

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