Nano-impact chronoamperometric experiments are a powerful technique for simultaneously probing both the potential of zero charge (PZC) and the diffusion coefficient (D 0) 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 (vs. 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 × 10–13 m2 s–1. This quick characterisation technique may significantly assist the application of graphene nanoplatelets, or similar nano-materials, in electronic, sensor, and clinical medicinal technologies.
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机译：纳米冲击计时电流法实验是一种强大的技术，可同时探测石墨烯纳米血小板（GNP）的零电荷电势（PZC）和扩散系数（D 0）。该方法为材料表征提供了一种有效的通用方法。使用纳米碰撞实验，可以观察到宽度为15μm，厚度为6-8 nm的石墨烯纳米片的电容性影响。看到的当前瞬态特征允许将PBS缓冲液中石墨烯纳米片的PZC测定为–0.14±0.03 V（相对于饱和甘汞电极）。通过实验发现，在相同的水性介质中，具有许多生物条件的等渗性的扩散系数对于石墨烯纳米片是2±0.8×10 –13 m 2 s –1 。这种快速的表征技术可以极大地协助石墨烯纳米片或类似纳米材料在电子，传感器和临床医学技术中的应用。
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