Sandwich-type ordered mesoporous carbon/graphene nanocomposites derived from ionic liquid

Sandwich-type ordered mesoporous carbon/graphene nanocomposites were successfully synthesized using 2D ordered mesoporous silica/graphene nanocomposites as the hard template and an ionic liquid as a N-rich carbon source. We used an ionic liquid of 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide containing nitrile groups (–CN) in the cation and anion as a carbon precursor for the preparation of the nanocomposites. Nitriles do not decompose under thermal treatment in an inert gas atmosphere, but leave significant amounts of N-rich carbon materials. The nanocomposites had a large surface area (1,316 m2·g–1), an average pore diameter of 5.9 nm, and high electrical conductivity. The nanocomposite electrode showed a high specific capacitance of 190 F·g–1at 0.5 A·g–1in 1 M TEABF4/AN electrolyte and a good rate capability between 0 and 2.7 V for supercapacitor (or ultracapacitor) applications. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

有序介孔碳/石墨烯/镍泡沫的制备及其对多巴胺的高灵敏度和高选择性检测

柔性生物传感器在可穿戴电子设备中有着广泛的应用前景.为了获得柔性电化学多巴胺传感器,作者在本工作中首先在镍泡沫表面通过化学气相沉积生长石墨烯,随后通过高温碳化嵌段共聚物与酚醛树脂在石墨烯表面共组装形成的薄膜制备了有序介孔碳/石墨烯/镍泡沫(OMC/G/Ni)复合材料.其中,镍泡沫可以为复合材料提供具有高导电性和良好柔韧性的金属骨架,而具有垂直排列介孔阵列的有序介孔碳层为复合材料提供了高的电活性表面积,且有利于活性位点的暴露.值得注意的是,夹在有序介孔碳层和镍泡沫之间的石墨烯极大地增强了各组分之间的相容性,有利于进一步提升复合材料的电化学性能.作为电化学传感器中的工作电极,OMC/G/Ni体现出优异的多巴胺检测能力.不但具有宽的线性检测范围(0.05-58.75μmol·L^-1)和低检测限(0.019μmol·L^-1),还具有良好的选择性、重现性和稳定性.此外,OMC/G/Ni在弯曲状态下依旧能够保持对多巴胺的高检测能力,证明了其在柔性生物传感器中的应用潜力.

有序介孔碳-石墨烯复合材料的制备及其对银纳米粒子吸附性能的研究

以溶剂挥发诱导有机-有机自组装法制备了有序介孔碳-石墨烯(OMC-RGO)复合材料。结果表明:当焙烧温度为800℃时,所得的OMC-RGO复合材料与OMC相比,其电导率从0.76S/m增加到32.5S/m,提高到42.8倍;但BET比表面积和孔容分别从670m2/g和0.40cm3/g下降到361m2/g和0.23cm3/g,降低的比率分别为46.1%和42.5%。随后,我们以OMC-RGO为载体,通过物理吸附制备了有序介孔碳-石墨烯-银纳米粒子(OMC-RGO-Ag)复合材料。结果表明:OMC-RGO表面上Ag纳米粒子的粒径在20～40nm之间;且OMC与RGO复合后,RGO表面上的含氧官能团有利于吸附较多的Ag纳米粒子。