Graphene as a spacer to layer-by-layer assemble electrochemically functionalized nanostructures for molecular bioelectronic devices.
Graphene as a spacer to layer-by-layer assemble electrochemically functionalized nanostructures for molecular bioelectronic devices.
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DOI：
10.1021/la202018r
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发表时间：
2011-08
期刊：
影响因子：
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通讯作者：
Xiang Wang;Jingfang Wang;Hanjun Cheng;Ping Yu;Jianshan Ye;L. Mao
中科院分区：
文献类型：
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作者：
Xiang Wang;Jingfang Wang;Hanjun Cheng;Ping Yu;Jianshan Ye;L. Mao
该研究证明了石墨烯作为间隔物以可控方式通过逐层（LBL）化学在电极上形成电化学官能化多层纳米结构的能力。亚甲基绿色（MG）和带正电荷的甲基咪唑官能化的多壁碳纳米管（MWNTs）分别用作组装的电活性物质和电化学有用组分的实例。通过使用石墨烯作为间隔物，基于石墨烯与电化学有用组分之间的静电和/或π-π相互作用，石墨烯/MG和石墨烯/MWNT的多层纳米结构可以容易地用LBL方法形成在电极上。利用扫描电子显微镜（SEM）、紫外-可见光谱（UV-vis）和循环伏安（CV）对组装过程进行了表征，结果表明，以石墨烯为间隔物，纳米结构组装均匀有效。电化学研究表明，组装的纳米结构具有优异的电化学性能和对NADH氧化的电催化活性，因此可以用作生物电子器件的电子换能器。以乙醇脱氢酶为基础的电化学生物传感器和葡萄糖脱氢酶为基础的葡萄糖/O（2）生物燃料电池为典型实例，进一步证明了这种潜力。这项研究提供了一个简单的路线，以石墨烯为基础的电化学功能化的纳米结构，可用于分子生物电子器件，如生物传感器和生物燃料电池的发展可控的形成。
This study demonstrates the capability of graphene as a spacer to form electrochemically functionalized multilayered nanostructures onto electrodes in a controllable manner through layer-by-layer (LBL) chemistry. Methylene green (MG) and positively charged methylimidazolium-functionalized multiwalled carbon nanotubes (MWNTs) were used as examples of electroactive species and electrochemically useful components for the assembly, respectively. By using graphene as the spacer, the multilayered nanostructures of graphene/MG and graphene/MWNT could be readily formed onto electrodes with the LBL method on the basis of the electrostatic and/or π-π interaction(s) between graphene and the electrochemically useful components. Scanning electron microscopy (SEM), ultraviolet-visible spectroscopy (UV-vis), and cyclic voltammetry (CV) were used to characterize the assembly processes, and the results revealed that nanostructure assembly was uniform and effective with graphene as the spacer. Electrochemical studies demonstrate that the assembled nanostructures possess excellent electrochemical properties and electrocatalytic activity toward the oxidation of NADH and could thus be used as electronic transducers for bioelectronic devices. This potential was further demonstrated by using an alcohol dehydrogenase-based electrochemical biosensor and glucose dehydrogenase-based glucose/O(2) biofuel cell as typical examples. This study offers a simple route to the controllable formation of graphene-based electrochemically functionalized nanostructures that can be used for the development of molecular bioelectronic devices such as biosensors and biofuel cells.