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Title: Effect of Electrochemical Oxidation on Physicochemical Properties of Fe-Containing Single-Walled Carbon Nanotubes

Journal Article · · ChemElectroChem
ORCiD logo [1];  [2];  [1];  [3];  [4];  [1]
  1. Aalto Univ., Otaniemi (Finland)
  2. Univ. of Oulu (Finland); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  3. Canatu Oy (Finland)
  4. Canatu Oy Tiilenlyöjänkuja 9 00390 01720 Vantaa Finland

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 Fe 3 O 4 and Fe 2 O 3 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FEPOD 2117731; AC02-76SF00515
OSTI ID:
1769961
Alternate ID(s):
OSTI ID: 1786162
Journal Information:
ChemElectroChem, Vol. 7, Issue 19; ISSN 2196-0216
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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