Abstract Electrically-conductive graphene colloids with tuned nanoporosity are promising materials for numerous applications. As charge-transfer interaction enhances electrical conductivity of polyaromatic hydrocarbon crystals, we intercalated water-soluble pyrene derivatives such as pyrene-boronic acid in nanoporous graphene by reduction of a mixture of graphene oxides and pyrene derivatives. The pyrene derivative intercalation increases more than twice both microporosity and mesoporosity. The N2 adsorption isotherms at 77 K of all samples have low-pressure adsorption hysteresis due to inaccessible small microporosity; the total porosity evaluated by water adsorption at 298 K is almost twice that of N2 adsorption. These adsorption measurements together with X-ray diffraction suggest the presence of a pore mouth structure whose width is about 0.4 nm. The charge-transfer interaction between the pyrene derivative and porous graphene is evidenced by a high frequency shift of the G band of Raman spectrum, appearance of a new optical absorption band, and the increase in electrical conductivity. The intercalation of pyrene-boronic acid through charge-transfer interaction increases the voltammetric charge of cyclic voltammogram for nanoporous graphene owing to an enhanced ion-accessibility from 3% to 54%, which indicates their high application potential for electrochemical studies.

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电荷转移介导的纳米孔控制芘衍生物/石墨烯胶体

摘要 具有可调纳米孔隙率的导电石墨烯胶体是具有多种应用前景的材料。由于电荷转移相互作用增强了聚芳烃晶体的导电性，我们通过还原氧化石墨烯和芘衍生物的混合物，将水溶性芘衍生物（如芘-硼酸）插入纳米多孔石墨烯中。芘衍生物嵌入使微孔率和中孔率均增加两倍以上。由于难以接近的小微孔，所有样品在 77 K 处的 N2 吸附等温线都具有低压吸附滞后；在 298 K 下通过水吸附评估的总孔隙率几乎是 N2 吸附的两倍。这些吸附测量与 X 射线衍射一起表明存在宽度约为 0 的孔口结构。4 纳米。芘衍生物和多孔石墨烯之间的电荷转移相互作用可以通过拉曼光谱 G 带的高频位移、新的光吸收带的出现和电导率的增加来证明。芘 - 硼酸通过电荷转移相互作用的嵌入增加了纳米多孔石墨烯循环伏安图的伏安电荷，因为离子可及性从 3% 提高到 54%，这表明它们在电化学研究中的应用潜力很大。