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Nucleotides as Structural Templates for The Self-Assembly of Quantum-Confined Cds Crystallites

Published online by Cambridge University Press:  28 February 2011

Jeffery L. Coffer  and
Robin R. Chandler
Jeffery L. Coffer
Affiliation:
Department of Chemistry, Texas Christian University, Ft. Worth, Texas, 76129
Robin R. Chandler
Affiliation:
Department of Chemistry, Texas Christian University, Ft. Worth, Texas, 76129
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Abstract

We report here the use of nucleotides as stabilizers in the formation of quantum-confined (‘Q-size’) CdS, with the size and composition of the nucleotide exerting a significant effect on the resultant CdS structure. In general, CdS formed from equimolar Cd+2 and S2− (6 × 10−4 M) in the presence of a number of nucleotides yields clusters possessing similar absorption spectra but which differ significantly with respect to emissive behavior and overall physical stability. CdS/polynucleotide colloids (DNA, poly [A], poly[C]) exhibit strong trap luminescence and are stable on a timescale of months, but analogous CdS prepared from the mononucleotides ATP and AMP are virtually nonemissive and flocculate within hours, even upon stabilization at lower temperatures (5 to −60°C). In addition to their preparation and spectroscopic properties, the results of TEM, AFM, and computer modeling studies on these CdS/nucleotide colloids are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 206: Symposium G – Clusters and Cluster-Assembled Materials , 1990 , 527
Copyright
Copyright © Materials Research Society 1991

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