Krittayavathananon Atiweena, Li Xiuting, Batchelor-McAuley Christopher, Sawangphruk Montree, Compton Richard G
Department of Chemistry, Physical and Theoretical Chemistry Laboratory , University of Oxford , South Parks Road , Oxford OX1 3QZ , United Kingdom.
Department of Chemical and Biomolecular Engineering, School of Energy Science and Technology , Vidyasirimedhi Institute of Science and Technology , Rayong 21210 , Thailand.
J Phys Chem Lett. 2018 Oct 4;9(19):5822-5826. doi: 10.1021/acs.jpclett.8b02296. Epub 2018 Sep 24.
We report the influence of electrolyte on the electrical contact between graphene nanoplatelets (GNPs) and an electrode via a single entity electrochemical technique. The current "steps" were observed in the absence of electrolyte due to the GNPs impacting on and bridging across an interdigitated gold electrode array (IDE); in contrast, current spikes of short duration were obtained in the presence of electrolyte. This result indicates that in the latter case the constant short-circuit bridging current was switched off and replaced solely by impacts of GNPs with single electrodes. These observed current spikes measured in the presence of electrolyte are evidenced to be of a capacitative nature, demonstrating the high sensitivity of the electronic properties of the GNP/metal junction to the ionic strength of the electrolytic solution.
我们通过单实体电化学技术报告了电解质对石墨烯纳米片（GNPs）与电极之间电接触的影响。在没有电解质的情况下观察到电流“阶跃”，这是由于GNPs撞击并跨越叉指式金电极阵列（IDE）；相反，在有电解质的情况下获得了持续时间短的电流尖峰。该结果表明，在后一种情况下，恒定的短路桥接电流被关闭，仅由GNPs与单个电极的撞击所取代。在有电解质的情况下测量到的这些观察到的电流尖峰被证明具有电容性质，表明GNP/金属结的电子性质对电解液离子强度具有高灵敏度。
