DNA-templated assembly and electropolymerization of aniline on gold surface |
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| Institution: | 1. Institute of Physics of Complex Matter, EPFL, Lausanne, Switzerland;2. School of Chemistry, University of Sydney, Sydney 2006, Australia;1. Scientific Research Innovation Team of Solidification Theory and Functional Materials, Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710021, People’s Republic of China;2. School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, People’s Republic of China |
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| Abstract: | Biomolecule template gives new opportunities for the fabrication of novel materials with special features. Here we report a route to the formation of DNA–polyaniline (PAn) complex, using immobilized DNA as a template. A gold electrode was first modified with monolayer of 2-aminoethanethiol by self-assembly. Thereafter, by simply immersing the gold electrode into DNA solution, DNA molecules can be attached onto the gold surface, followed by the DNA-templated assembly and electropolymerization of protonated aniline. The electrostatic interactions between DNA and aniline can keep the aniline monomers aligning along the DNA strands. Investigations by surface plasmon resonance (SPR), electrochemistry and reflection–absorption UV/Vis–Near IR spectroscopy substantially convince that PAn can be electrochemically grown around DNA template on gold surface. This work may be provides fundamental aspects for building PAn nanowires with DNA as template on solid surface if DNA molecules can be individually separated and stretched. |
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