Synthesis and Application of DNA−CdS Nanowires within a Minute using Microwave Irradiation

A very fast, electroless, microwave method is described to synthesize electrically conductive CdS nanowires on DNA just within 60 s. The electrical characterization indicates that the CdS wires are continuous, have very low contact resistance, and exhibit Ohmic behavior. Highly selective deposition...

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Bibliographic Details
Published in:Inorganic chemistry 2009-01, Vol.48 (1), p.121-127
Main Authors: Kundu, Subrata, Lee, Hyungoo, Liang, Hong
Format: Article
Language:English
Subjects:
Cadmium Compounds - chemical synthesis
Cadmium Compounds - chemistry
Costs and Cost Analysis
DNA - chemistry
Electric Conductivity
Heating
Microscopy, Electron, Scanning
Microscopy, Electron, Transmission
Microwaves
Nanowires - chemistry
Nanowires - radiation effects
Perchlorates - chemistry
Spectrophotometry, Ultraviolet
Sulfides - chemical synthesis
Sulfides - chemistry
Thioacetamide - chemistry
Time Factors
Water - chemistry
X-Ray Diffraction
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Summary:A very fast, electroless, microwave method is described to synthesize electrically conductive CdS nanowires on DNA just within 60 s. The electrical characterization indicates that the CdS wires are continuous, have very low contact resistance, and exhibit Ohmic behavior. Highly selective deposition on DNA is obtained by specific complexation between the Cd(II) ion and DNA, followed by decomposition of thioacetamide to S2− to form CdS. The nanowires are found to have a diameter of 140−170 nm and a length of ∼8−12 μm. The one-step process developed here does not perturb the overall conformation of the DNA chain. The nanowires we fabricated can be used as building blocks for functional nanodevices, tiny computers, sensors, and optoelectronics.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic801791u