Polyaniline Nanowires on Si Surfaces Fabricated with DNA Templates

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• 作者：Yufeng Ma ; Jianming Zhang ; Guojin Zhang ; and Huixin He
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：June 9, 2004
• 年：2004
• 卷：126
• 期：22
• 页码：7097 - 7101
• 全文大小：440K
• 年卷期：v.126,no.22(June 9, 2004)
• ISSN：1520-5126

文摘

It is essential to put individual, free-standing nanowires onto insulating substrates and integratethem to useful devices. Here we report a strategy for fabrication of conducting polymer nanowires onthermally oxidized Si surfaces by use of DNA as templates. The direct use of stretched and immobilizedDNA strands as templates avoids the agglomeration of DNA caused by shielding of charges on DNA whenpolyaniline/DNA complexes formed in solution. Most importantly, the oriented DNA strands immobilizedon the Si surface predetermine the position and the orientation of the nanowires. The approach describedhere is the first step toward uniting the programmable-assembly ability of DNA with the unique electronicproperties of conducting polymers for high-density functional nanodevices. The conductivity of the nanowiresis very sensitive to the proton doping-undoping process, suggesting that the nanowires hold great promisefor sensitive chemical sensor applications.