Wu Can, Cheng Qin, Wu Kangbing, Wu Gang, Li Qing
Key Laboratory for Large-Format Battery Materials and System, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Key Laboratory for Large-Format Battery Materials and System, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Anal Chim Acta. 2014 May 12;825:26-33. doi: 10.1016/j.aca.2014.03.036. Epub 2014 Mar 28.
Graphene was easily obtained via one-step ultrasonic exfoliation of graphite powder in N-methyl-2-pyrrolidone. Scanning electron microscopy, transmission electron microscopy, Raman and particle size measurements indicated that the exfoliation efficiency and the amount of produced graphene increased with ultrasonic time. The electrochemical properties and analytical applications of the resulting graphene were systematically studied. Compared with the predominantly-used reduced graphene oxides, the obtained graphene by one-step solvent exfoliation greatly enhanced the oxidation signals of various analytes, such as ascorbic acid (AA), dopamine (DA), uric acid (UA), xanthine (XA), hypoxanthine (HXA), bisphenol A (BPA), ponceau 4R, and sunset yellow. The detection limits of AA, DA, UA, XA, HXA, BPA, ponceau 4R, and sunset yellow were evaluated to be 0.8 μM, 7.5 nM, 2.5 nM, 4 nM, 10 nM, 20 nM, 2 nM, and 1 nM, which are much lower than the reported values. Thus, the prepared graphene via solvent exfoliation strategy displays strong signal amplification ability and holds great promise in constructing a universal and sensitive electrochemical sensing platform.
通过在N-甲基-2-吡咯烷酮中对石墨粉进行一步超声剥离可轻松获得石墨烯。扫描电子显微镜、透射电子显微镜、拉曼光谱和粒度测量表明，剥离效率和石墨烯产量随超声时间增加而提高。对所得石墨烯的电化学性质和分析应用进行了系统研究。与主要使用的还原氧化石墨烯相比，通过一步溶剂剥离获得的石墨烯极大地增强了各种分析物的氧化信号，如抗坏血酸（AA）、多巴胺（DA）、尿酸（UA）、黄嘌呤（XA）、次黄嘌呤（HXA）、双酚A（BPA）、丽春红4R和日落黄。AA、DA、UA、XA、HXA、BPA、丽春红4R和日落黄的检测限分别评估为0.8 μM、7.5 nM、2.5 nM、4 nM、10 nM、20 nM、2 nM和1 nM，远低于报道值。因此，通过溶剂剥离策略制备的石墨烯具有很强的信号放大能力，在构建通用且灵敏的电化学传感平台方面具有巨大潜力。
