Density controlled conductivity of pristine graphene films
Density controlled conductivity of pristine graphene films
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DOI：
10.1016/j.carbon.2013.07.096
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发表时间：
2013-11-01
期刊：
影响因子：
10.9
通讯作者：
Dalton, Alan B.
中科院分区：
文献类型：
--
作者：
Fahimi, Azin;Jurewicz, Izabela;Dalton, Alan B.
单层或几层石墨烯可以被认为是一种令人兴奋的准二维分子材料，具有广泛的应用前景。一个关键的瓶颈可能出现在它们在二维和三维的大范围内被控制地组装成宏观总体的问题上。朗缪尔型组装是一种特别有用的方法，可以通过边缘相互作用来控制和操纵石墨烯在空气-水界面的分布。在这项研究中，通过改进先前开发的非侵入性石墨剥离工艺，制备了悬浮在有机溶剂中的原始石墨烯。通过溶剂混合控制石墨烯分散体的蒸汽压，成功地在空气-水界面沉积了石墨烯。通过在单层压缩过程中遵循压力-面积等温线仔细控制密度，可以精确调整电导率。使用朗缪尔-谢弗水平沉积方法，可以轻松地将所得组件转移到玻璃和其他基板上，从而生产出具有可调电导率的薄膜，该薄膜表现出渗流型行为。这种工艺的一个主要优点是，与石墨烯氧化物不同，导电薄膜不需要进一步处理。此外，这些组件的物理性质可以很容易地控制，这是基于石墨烯的电子应用的先驱。(C)2013爱思唯尔有限公司。保留所有权利。
Single or few layer graphene can be considered an exciting pseudo-two-dimensional molecular material that potentially has a wide range of applications. A critical bottleneck may arise with issues in their controlled assembly into macroscopic ensembles over large areas both in two and three dimensions. Langmuir-type assembly is a particularly useful method to control and manipulate the distribution of graphene at the air-water interface via edge-edge interactions. In this study, pristine graphene suspended in organic solvent was prepared through adaptation of a previously developed process involving the non-invasive exfoliation of graphite. Successful deposition of graphene at the air-water interface was achieved by manipulating the vapor-pressure of the graphene dispersion through solvent mixing. Through careful control of density by following the pressure-area isotherm during monolayer compression, it is possible to precisely tune the electrical conductivity The resulting assemblies can be easily transferred to glass and other substrates using the Langmuir-Schaefer horizontal deposition method producing thin films with tunable electrical conductivity that exhibits percolation-type behavior. A major advantage of this process is that the conducting films require no further treatment unlike their graphene-oxide counterparts. Moreover, the physical properties of these assemblies can be easily controlled which is a precursor for graphene-based electronic applications. (C) 2013 Elsevier Ltd. All rights reserved.