University of Oulu

E. Leppänen, S. Sainio, H. Jiang, B. Mikladal, I. Varjos, T. Laurila, ChemElectroChem 2020, 7, 4136. https://doi.org/10.1002/celc.202000878

Effect of electrochemical oxidation on physicochemical properties of Fe‐containing single‐walled carbon nanotubes

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Author: Leppänen, Elli1; Sainio, Sami2,3; Jiang, Hua4;
Organizations: 1Department of Electrical Engineering and Automation, School of Electrical Engineering, Aalto University, P.O. Box. 13500, FI-00076 Aalto, Finland
2Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
3Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu P.O. Box. 4500, 90570 Oulu, Finland
4Department of Applied Physics, School of Science, Aalto University, Espoo 02150, Finland, P.O. Box 15100, FI-00076 Aalto, Finland
5Canatu Oy, Tiilenlyöjänkuja 9, 00390 01720 Vantaa, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe202103177639
Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2021-09-14
Description:

Abstract

Metal catalysts are necessary for fabricating carbon nanotubes, but are often considered impurities in the end products, and arduous steps are used to remove catalyst residues from the nanotube structure. However, as metals can be electrocatalytic, instead of removing them we can utilize their role in detection of analgesics. Herein, we study the physicochemical properties of Fe‐containing single‐walled carbon nanotubes (SWCNTs), and the effect of simple oxidative pretreatment on them. We show that a gentle anodic pretreatment i) increased the amount of oxidized Fe nanoparticles, most likely exhibiting phases Fe₃O₄ and Fe₂O₃ and ii) effectively removed disordered carbonaceous material from SWCNT bundles surfaces. Pretreatment had only a marginal effect on sensitivity towards analgesics. However, interestingly, selectivity of Fe‐SWCNTs towards paracetamol and morphine could be modified with pretreatment. Through this kind of in‐depth investigation, we can, to a certain extent, correlate various material properties of SWCNTs with the observed electrochemical performance. This approach allows us to evaluate what factors in SWCNTs truly affect the electrochemical detection of biomolecules.

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Series: ChemElectroChem
ISSN: 2196-0216
ISSN-E: 2196-0216
ISSN-L: 2196-0216
Volume: 7
Issue: 19
Pages: 4136 - 4143
DOI: 10.1002/celc.202000878
OADOI: https://oadoi.org/10.1002/celc.202000878
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
221 Nanotechnology
116 Chemical sciences
Subjects:
Funding: This project was supported by Business Finland (FEPOD 2117731 project), European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska‐Curie grant agreement No 841621. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract number DE‐AC02‐76SF00515.
EU Grant Number: (841621) TACOMA - Towards Application specific tailoring of CarbOn nanoMAterials
Copyright information: © 2020 Wiley‐VCH GmbH. This is the peer reviewed version of the following article: E. Leppänen, S. Sainio, H. Jiang, B. Mikladal, I. Varjos, T. Laurila, ChemElectroChem 2020, 7, 4136, which has been published in final form at https://doi.org/10.1002/celc.202000878. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.