Observations of copper deposition on functionalized carbon nanotube films

This research details the spontaneous electroless and electrodeposition of copper onto carbon nanotube (CNT) film from a copper sulfate electrolyte. Inhomogeneous electrodeposition was found to occur on pristine CNT film due to differences in available active nucleation sites and the hydrophobic nat...

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Bibliographic Details
Published in:Electrochimica acta 2017-04, Vol.232, p.495-504
Main Authors: Hannula, Pyry-Mikko, Aromaa, Jari, Wilson, Benjamin P., Janas, Dawid, Koziol, Krzysztof, Forsén, Olof, Lundström, Mari
Format: Article
Language:English
Subjects:
Adsorption
Anodizing
Aqueous electrolytes
Carbon
Carbon nanotube film
Carbon nanotubes
Cathodic polarization
Copper
Copper sulfate
Electrodeposition
Electroless plating
Electrolytes
Functional groups
functionalization
Heat treatment
Nanotubes
Nucleation
Studies
surface activity
Surface chemistry
Wetting
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Summary:This research details the spontaneous electroless and electrodeposition of copper onto carbon nanotube (CNT) film from a copper sulfate electrolyte. Inhomogeneous electrodeposition was found to occur on pristine CNT film due to differences in available active nucleation sites and the hydrophobic nature of the film. In order to improve the electrochemical response of CNT films, oxidative pre-treatments such as heat treatment and anodization were investigated. These treatments were shown to increase the amount of oxygen containing defects at the surface of CNT film material. Incorporation of functional groups were shown to enhance the wetting of the aqueous electrolyte and created a highly active surface suitable for homogenous electrodeposit. Cathodic polarization curves showed that the presence of functional groups decreased the required level of polarization for copper deposition. Nevertheless, after a certain level of functionalization the polarization starts to decrease due to increased resistivity of the CNT film. Oxygen grafted CNT films were also shown to exhibit enhanced adsorption and reduction of copper without applied voltage due to redox replacement reactions, which were observed to increase with enhanced levels of functionalization.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.03.006