Abstract
We describe the conformational behavior and morphological control of DNA-mineralizedCdS nanowires in a bulk solution. The conformational behavior of individualdouble-stranded DNA in the presence of cadmium ions and stoichiometric mixtures ofcadmium ions and sulfide ions was directly visualized by fluorescence microscopy. It wasfound that in the presence of mixtures of cadmium ions and sulfide ions, DNA moleculesexhibit a conformational transition from an elongated coil to a compacted state.Mineralized DNA nanowires possess a significant conformational freedom at a microscale,and flexibility in the micro- and nanodimensions. The density of the inorganic material onthe nanowire can be controlled by varying the concentrations and the molar ratio ofNa2S toCd(ClO4)2.
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