Incorporation of Single-Walled Carbon Nanotubes into Ferrocene-Modified Linear Polyethylenimine Redox Polymer Films

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• 作者：Tu O. Tran ; Emily G. Lammert ; Jie Chen ; Stephen A. Merchant ; Daniel B. Brunski ; Joel C. Keay ; Matthew B. Johnson ; Daniel T. Glatzhofer ; David W. Schmidtke
• 刊名：Langmuir
• 出版年：2011
• 出版时间：May 17, 2011
• 年：2011
• 卷：27
• 期：10
• 页码：6201-6210
• 全文大小：1276K
• 年卷期：v.27,no.10(May 17, 2011)
• ISSN：1520-5827

文摘

In this study, we describe the effects of incorporating single-walled carbon nanotubes (SWNTs) into redox polymer鈭抏nzyme hydrogels. The hydrogels were constructed by combining the enzyme glucose oxidase with a redox polymer (Fc-C₆-LPEI) in which ferrocene was attached to linear poly(ethylenimine) by a six-carbon spacer. Incorporation of SWNTs into these films changed their morphology and resulted in a significant increase in the enzymatic response at saturating glucose concentrations (3 mA/cm²) as compared to films without SWNTs (0.6 mA/cm²). Likewise, the sensitivity at 5 mM glucose was significantly increased in the presence of SWNTs (74 渭A/cm²路mM) as compared to control films (26 渭A/cm²路mM). We demonstrate that the increase in the electrochemical and enzymatic response of these films depends on the amount of SWNTs incorporated and the method of SWNT incorporation. Furthermore, we report that the presence of SWNTs in thick films allows for more of the ferrocene redox centers to become accessible. The high current densities of the hydrogels should allow for the construction of miniature biosensors and enzymatic biofuel cells.