TY - GEN
T1 - Stabilization of (CdSe)ZnS quantum dots in water using amino acid capping groups
AU - Jones, M.
AU - Ding, S. Y.
AU - Tucker, M. P.
AU - Kim, Y. H.
AU - Zhang, S. B.
AU - Himmel, M. E.
AU - Rumbles, G.
PY - 2006/10/16
Y1 - 2006/10/16
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:33749583545
SN - 1566774357
SN - 9781566774352
T3 - Proceedings - Electrochemical Society
SP - 340
EP - 349
BT - Electron Transfer in Nanomaterials - Proceedings of the International Symposium
T2 - 205th Electrochemical Society Meeting
Y2 - 9 May 2004 through 14 May 2004
ER -