Kong Byung-Seon, Yoo Hae-Wook, Jung Hee-Tae
National Research Laboratory for Organic Opto-Electronic Materials, Department of Chemical and Biomolecular Engineering (BK-21), Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Korea.
Langmuir. 2009 Sep 15;25(18):11008-13. doi: 10.1021/la901310g.
The electrical conductivity of graphene oxide (GO) and reduced graphene oxide (RGO) films with poly(allylamine hydrochloride) (PAH) supporting layers is investigated. Graphene-PAH hybrid films were produced in a two-step procedure that consisted of vacuum filtration for GO (or RGO) dispersion to fabricate the graphene thin films on quartz substrates, followed by the deposition of PAH onto the graphene films via solution casting. Highly selective deposition of the PAH layer on the graphene sheets was confirmed through the detection of the fluorescence signals of hybridized Cy3-DNA onto the PAH-coated graphene surfaces. In this case, electrostatic interaction plays an important role in the selective deposition process. Interestingly, it was found that the electrical conductivity of RGO films was significantly enhanced by 120% after PAH treatment, whereas that of the GO films was reduced by 98% of its initial conductivity. This finding was interpreted in terms of the molecular structure and oxygen functionalities of GO and RGO films combined with the ionic conduction characteristics of hydrated PAH on the RGO film.
研究了具有聚（烯丙胺盐酸盐）（PAH）支撑层的氧化石墨烯（GO）和还原氧化石墨烯（RGO）薄膜的电导率。石墨烯-PAH混合薄膜通过两步法制备，第一步是对GO（或RGO）分散液进行真空过滤，以在石英基板上制备石墨烯薄膜，第二步是通过溶液浇铸将PAH沉积到石墨烯薄膜上。通过检测杂交的Cy3-DNA在PAH包覆的石墨烯表面上的荧光信号，证实了PAH层在石墨烯片上的高度选择性沉积。在这种情况下，静电相互作用在选择性沉积过程中起重要作用。有趣的是，发现PAH处理后RGO薄膜的电导率显著提高了120%，而GO薄膜的电导率则降低到其初始电导率的98%。这一发现结合GO和RGO薄膜的分子结构和氧官能团以及水合PAH在RGO薄膜上的离子传导特性进行了解释。
