Self-assembled reduced graphene oxide/polyacrylamide conductive composite films.
Self-assembled reduced graphene oxide/polyacrylamide conductive composite films.
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DOI：
10.1021/am504941p
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发表时间：
2014-11
影响因子：
9.5
通讯作者：
Shiyou Yu;Ning Li;Drew C. Higgins;Deyu Li;Qing Li;Hui Xu;J. Spendelow;Gang Wu
中科院分区：
文献类型：
--
作者：
Shiyou Yu;Ning Li;Drew C. Higgins;Deyu Li;Qing Li;Hui Xu;J. Spendelow;Gang Wu
通过在阳离子聚丙烯酰胺（CPAM）层上自组装氧化石墨烯（GO），然后进行化学还原，制备了承托基底的导电薄膜。在自组装过程中，来自溶液的具有负zeta电位的分散氧化石墨烯纳米片自发组装到带正电的CPAM吸附层上。此外，用电化学石英晶体微天平（EQCM）研究了基片上CPAM的吸附，表明吸附稳定可以在150秒内建立。首次利用EQCM改变极化势，研究了氧化石墨烯与CPAM之间的静电相互作用，确定了促进自组装的最佳条件。利用拉曼光谱、红外光谱和原子力显微镜对自组装的GO/CPAM薄膜进行了表征。重要的是，还原的氧化石墨烯(R-GO)/CPAM复合膜的片电阻为3.1 kΩ/sq，可以通过在室温下硼氢化钠中原位还原20分钟获得。这为制备导电石墨烯基复合薄膜提供了一种简单、高效、绿色的途径。
Substrate supported conductive thin films are prepared by the self-assembly of graphene oxide (GO) on a cationic polyacrylamide (CPAM) layer followed by a subsequent chemical reduction. During self-assembly, the dispersed GO nanosheets with a negative zeta potential from solution are spontaneously assembled onto the positively charged CPAM adsorption layer. In addition, CPAM adsorption on the substrate is studied with an electrochemical quartz crystal microbalance (EQCM), showing adsorption stabilization could be established in less than 150 s. The electrostatic interactions between GO and CPAM are investigated by changing the polarization potential with EQCM for the first time, and optimal conditions for facilitating self-assembly are determined. The self-assembled GO/CPAM films are further characterized by Raman spectroscopy, infrared spectroscopy and atomic force microscopy. Importantly, reduced GO (R-GO)/CPAM composite films exhibiting a sheet resistance of 3.1 kΩ/sq can be obtained via in situ reduction in sodium borohydride for 20 min at room temperature. This provides a simple, highly effective, and green route to prepare conductive graphene-based composite thin films.