Kouloumpis Antonios, Thomou Eleni, Chalmpes Nikolaos, Dimos Konstantinos, Spyrou Konstantinos, Bourlinos Athanasios B, Koutselas Ioannis, Gournis Dimitrios, Rudolf Petra
Department of Materials Science and Engineering and Physics Department, University of Ioannina, GR-45110 Ioannina, Greece.
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands.
ACS Omega. 2017 May 16;2(5):2090-2099. doi: 10.1021/acsomega.7b00107. eCollection 2017 May 31.
The special electronic, optical, thermal, and mechanical properties of graphene resulting from its 2D nature, as well as the ease of functionalizing it through a simple acid treatment, make graphene an ideal building block for the development of new hybrid nanostructures with well-defined dimensions and behavior. Such hybrids have great potential as active materials in applications such as gas storage, gas/liquid separation, photocatalysis, bioimaging, optoelectronics, and nanosensing. In this study, luminescent carbon dots (C-dots) were sandwiched between oxidized graphene sheets to form novel hybrid multilayer films. Our thin-film preparation approach combines self-assembly with the Langmuir-Schaefer deposition and uses graphene oxide nanosheets as template for grafting C-dots in a bidimensional array. Repeating the cycle results in a facile and low-cost layer-by-layer procedure for the formation of highly ordered hybrid multilayers, which were characterized by photoluminescence, UV-visible, X-ray photoelectron, and Raman spectroscopies, as well as X-ray diffraction and atomic force microscopy.
石墨烯因其二维特性而具有特殊的电子、光学、热学和机械性能，并且通过简单的酸处理即可轻松实现功能化，这使得石墨烯成为开发具有明确尺寸和行为的新型混合纳米结构的理想构建单元。此类混合物作为活性材料在气体存储、气/液分离、光催化、生物成像、光电子学和纳米传感等应用中具有巨大潜力。在本研究中，发光碳点（C点）夹在氧化石墨烯片之间，形成新型混合多层膜。我们的薄膜制备方法将自组装与朗缪尔-谢弗沉积相结合，并使用氧化石墨烯纳米片作为模板，以二维阵列形式接枝C点。重复该循环可形成一种简便且低成本的逐层方法，用于形成高度有序的混合多层膜，通过光致发光、紫外-可见、X射线光电子能谱和拉曼光谱以及X射线衍射和原子力显微镜对其进行表征。
