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Fabrication of Well-Aligned and Highly Dense Cadmium Sulfide Nanowires on DNA Scaffolds Using the Poly(dimethylsiloxane) Transfer Method

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posted on 09.04.2009 by Zhenxing Wang, Jinyang Liu, Kun Zhang, Hongbing Cai, Guanghui Zhang, Yukun Wu, Tao Kong, Xiaoping Wang, Jie Chen, Jianguo Hou
We have developed a simple, yet highly effective and reliable, poly(dimethylsiloxane) (PDMS) transfer method to fabricate highly dense and well-aligned CdS nanowires on silica substrates, following DNA templates. CdS nanoparticles are selectively deposited and confined on DNA strings aligned on a PDMS sheet to form CdS nanowires. The nanowires are then transferred to the substrate with a low occurrence of parasitic CdS nanoparticles. The mapping of elements in the nanowires by scanning Auger electron spectroscopy reveals the dense distribution of Cd and S elements along DNA scaffolds. The width and length of the nanowires can be controlled by adjusting the incubation time on the PDMS sheet. Atomic force microscopy and field emission scanning electron microscopy show that the height and width of the nanowires reach 45 and 77 nm, respectively, after 72 h of growth. The nanowire can continuously stretch over 10 μm after 96 h of incubation. The method is easily replicable, and controllable, which makes it promising for building nanophotoelectronic devices and nanosensors.

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