Geometrical and chemical effects on the electrochemistry of single-wall carbon nanotube (SWCNT) network electrodes

Single-wall carbon nanotube (SWCNT) network is a promising electrode material for bio detection. Unfortunately, the associations between their physical as well as chemical properties and observed electrochemical performance are not known. This hinders any systematic optimization of the network properties towards specific analytes. Here we present a consistent physicochemical and electrochemical characterization of differently treated SWCNT networks. The results unambiguously show that (i) even if the electrochemical properties of different electrodes are practically identical when assessed by surface insensitive outer sphere redox (OSR) probes their behavior with inner sphere redox (ISR) probes can be drastically different. Further, (ii) the choice of the modification method (structural, chemical, electrochemical) heavily depends on nature of the target analyte, which are typically ISR probes. Although, (iii) chemical changes in the carbon phase appeared to be minor, effects of different treatments on oxidation states of Fe appeared to have a strong effect on the electrochemical performance of the networks in the case of ISR probes.

Description

Funding Information: The authors acknowledge Dr. Pether Engelhard for taking the TEM micrographs and building the 3D reconstruction of SWCNT networks. Mr. Jarkko Etula is acknowledged for taking the SEM images and conducting the Raman spectroscopy experiment. Publisher Copyright: © 2023 The Author(s)

Keywords

Electrochemistry, Single-walled carbon nanotubes, Structure-property relationship, X-ray absorption spectroscopy

DOI

10.1016/j.electacta.2023.143059

Citation

Leppänen , E , Gustafsson , E , Wester , N , Varjos , I , Sainio , S & Laurila , T 2023 , ' Geometrical and chemical effects on the electrochemistry of single-wall carbon nanotube (SWCNT) network electrodes ' , Electrochimica Acta , vol. 466 , 143059 . https://doi.org/10.1016/j.electacta.2023.143059

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202309135817

Collections

[article-cris] Kemian tekniikan korkeakoulu / CHEM

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