Engineering Laboratory for Modern Analytical Techniques, c/o State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Graduate University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, Jilin, PR China.
Talanta. 2011 Sep 30;85(4):2106-12. doi: 10.1016/j.talanta.2011.07.056. Epub 2011 Jul 21.
A new type of chemically converted graphene sheets, cationic polyelectrolyte-functionalized ionic liquid decorated graphene sheets (PFIL-GS) composite, was synthesized and characterized by Ultraviolet-visible (UV-vis) absorption, Fourier transform infrared, and Raman spectroscopy. It was found that the presence of PFIL enabled the formation of a very stable aqueous dispersion due to the electrostatic repulsion between PFIL modified graphene sheets. With respect to the excellent dispersibility of this material, we have fabricated a novel PFIL-GS/Prussian blue (PB) nanocomposite multilayer film via classic layer-by-layer (LBL) assembly. The assembly process was confirmed by UV-vis spectroscopy and surface plasmon resonance (SPR) spectroscopy, which showed linear responses to the numbers of the deposited PFIL-GS/PB bilayers. Moreover, the as-prepared composite films were used to detect hydrogen peroxide (H(2)O(2)) by electrochemical surface plasmon resonance (EC-SPR) spectroscopy. This real time EC-SPR technique can provide simultaneous monitoring of both optical SPR signal and electrochemical current responses upon injecting H(2)O(2) into the reaction cell. The experimental results revealed that both the electrochemical and SPR signal exhibited splendid linear relationship to the concentration of the injected H(2)O(2), and the detection limit could be up to 1 μM.
一种新型的化学转化石墨烯片，阳离子聚电解质功能化离子液体修饰的石墨烯片（PFIL-GS）复合材料，通过紫外可见（UV-vis）吸收、傅里叶变换红外和拉曼光谱进行了合成和表征。研究发现，由于 PFIL 修饰的石墨烯片之间的静电排斥作用，PFIL 的存在使得形成非常稳定的水性分散体成为可能。鉴于这种材料的优异分散性，我们通过经典的层层（LBL）组装方法制备了一种新型的 PFIL-GS/普鲁士蓝（PB）纳米复合材料多层膜。组装过程通过紫外可见光谱和表面等离子体共振（SPR）光谱得到证实，这表明对沉积的 PFIL-GS/PB 双层的数量呈线性响应。此外，所制备的复合膜用于通过电化学表面等离子体共振（EC-SPR）光谱检测过氧化氢（H（2）O（2））。这种实时 EC-SPR 技术可以在将 H（2）O（2）注入反应池时同时监测光学 SPR 信号和电化学电流响应。实验结果表明，电化学和 SPR 信号都与注入的 H（2）O（2）的浓度呈现出极好的线性关系，检测限可高达 1 μM。
