Poon Jeffrey, Batchelor-McAuley Christopher, Tschulik Kristina, Compton Richard G
Department of Chemistry, Physical and Theoretical Chemistry Laboratory , University of Oxford , South Parks Road , Oxford , OX1 3QZ , UK . Email:
Chem Sci. 2015 May 1;6(5):2869-2876. doi: 10.1039/c5sc00623f. Epub 2015 Mar 4.
Nano-impact chronoamperometric experiments are a powerful technique for simultaneously probing both the potential of zero charge (PZC) and the diffusion coefficient () of graphene nanoplatelets (GNPs). The method provides an efficient general approach to material characterisation. Using nano-impact experiments, capacitative impacts can be seen for graphene nanoplatelets of 15 μm width and 6-8 nm thickness. The current transient features seen allow the determination of the PZC of the graphene nanoplatelet in PBS buffer as -0.14 ± 0.03 V ( saturated calomel electrode). The diffusion coefficient in the same aqueous medium, isotonic with many biological conditions, for the graphene nanoplatelets is experimentally found to be 2 ± 0.8 × 10 m s. This quick characterisation technique may significantly assist the application of graphene nanoplatelets, or similar nano-materials, in electronic, sensor, and clinical medicinal technologies.
纳米冲击计时电流实验是一种强大的技术，可同时探测石墨烯纳米片（GNP）的零电荷电位（PZC）和扩散系数（）。该方法为材料表征提供了一种有效的通用方法。通过纳米冲击实验，可以观察到宽度为15μm、厚度为6 - 8nm的石墨烯纳米片的电容性冲击。所观察到的电流瞬态特征使得能够确定石墨烯纳米片在PBS缓冲液中的PZC为 -0.14 ± 0.03 V（饱和甘汞电极）。实验发现，在与许多生物条件等渗的相同水性介质中，石墨烯纳米片的扩散系数为2 ± 0.8 × 10 m s。这种快速表征技术可能会极大地促进石墨烯纳米片或类似纳米材料在电子、传感器和临床医药技术中的应用。
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