Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.
ACS Nano. 2011 Feb 22;5(2):1003-11. doi: 10.1021/nn102415c. Epub 2011 Jan 13.
We present fabrication and characterization of macroscopic thin films of graphene flakes, which are functionalized with 1-pyrenecarboxylic acid (PCA) and are laminated onto flexible and transparent polydimethylsiloxane (PDMS) membranes. The noncovalently (π-stacked) functionalization of PCA allows us to obtain a number of unique optical and molecular sensing properties that are absent in pristine graphene films, without sacrificing the conducting nature of graphene. The flexible PCA-graphene-PDMS hybrid structure can block 70-95% of ultraviolet (UV) light, while allowing 65% or higher transmittance in the visible region, rendering them potentially useful for a number of flexible UV absorbing/filtering applications. In addition, the electrical resistance of these structures is found to be sensitive to the illumination of visible light, atmospheric pressure change, and the presence of different types of molecular analytes. Owing to their multifunctionality, these hybrid structures have immense potential for the development of versatile, low-cost, flexible, and portable electronic and optoelectronic devices for diverse applications.
我们展示了宏观石墨烯薄片薄膜的制造和特性，这些薄片薄膜经过 1-蒽甲酸（PCA）功能化，并层压到柔性透明聚二甲基硅氧烷（PDMS）膜上。PCA 的非共价（π-堆积）功能化使我们获得了许多独特的光学和分子传感特性，而这些特性在原始石墨烯薄膜中是不存在的，同时又不牺牲石墨烯的导电性。柔性 PCA-石墨烯-PDMS 混合结构可以阻挡 70-95%的紫外线（UV）光，同时在可见光区域允许 65%或更高的透过率，这使得它们在许多柔性 UV 吸收/过滤应用中具有潜在的用途。此外，这些结构的电阻被发现对可见光的照射、大气压力变化和不同类型的分子分析物的存在敏感。由于它们的多功能性，这些混合结构具有巨大的潜力，可以为各种应用开发多功能、低成本、灵活和便携式的电子和光电子设备。
