Kaliyaraj Selva Kumar Archana, Compton Richard G
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, Great Britain.
J Phys Chem Lett. 2022 Jun 23;13(24):5557-5562. doi: 10.1021/acs.jpclett.2c01500. Epub 2022 Jun 13.
Cyclic voltammetry of ensembles of nanotube-modified electrodes fails to distinguish between signals from electroactive material adsorbed on the tubes from those due to a thin-layer response of analyte material occluded in the pores of the ensemble. We demonstrate that the distinction can be clearly made by combining cyclic voltammetry with single-entity measurements and provide proof of concept for the case of b-MWCNTs and the oxidation of 4-hexylresorcinol (HR), where the increased signals seen at the modified electrode are concluded to arise from thin-layer diffusion and not adsorptive effects. The physical insights are generic to porous, conductive composites.
纳米管修饰电极阵列的循环伏安法无法区分来自吸附在管上的电活性材料的信号与由于阵列孔隙中截留的分析物材料的薄层响应而产生的信号。我们证明，通过将循环伏安法与单实体测量相结合可以清楚地区分这两种信号，并为b-MWCNTs与4-己基间苯二酚（HR）氧化的情况提供了概念验证，其中在修饰电极上看到的信号增加被认为是由薄层扩散而非吸附效应引起的。这些物理见解对于多孔导电复合材料是通用的。
