The annealing of carpets of CNT coated with Cu-doped polydopamine lowers the carpets sheet resistance and induces the reduction of Cu ions into metallic Cu particles nucleating at the CNT surface.
The annealing (at 1073 K under Ar) of Ni–CNT composite, featuring CNT being fully embedded in Ni, leads to a highly interconnected system (by Ni nodules) with a decreased resistivity, as opposed to Cu–CNT composite.
The structures of airplanes are nowadays including more and more non electrically conductive plastics parts. To mitigate the damages after lightning strike events, copper meshes are integrated into the fuselage to provide it with electrical conductivity. Yet, although copper has one of the best electrical and thermal conductivities, its density remains high compared to materials like Aluminium (8.96 g.m-3 for Copper ; 2.7 g-m-3 for Aluminium) and R&D efforts are needed to develop new materials with higher specific electrical conductivity and ampacity. In 2013, Subramaniam et al.1 reported the fabrication of Copper/Carbon nanotubes (Cu-CNTs) composites with a similar specific conductivity than the one of copper and an ampacity increased by two orders of magnitude.The talks will describe an original fabrication method of Cu-CNTs composites based on electroplating and entirely realized without any hazardous organic solvents. Their electrical behaviour (conductivity as well as ampacity) will be described as well as a first evaluation of their lightning strike protection (LSP) properties. The lightning strike damages observed on pristine and Cu-CNTs samples consist of concentric vaporized zones more or less extended depending of samples. Interestingly, for some Cu-CNTs composites, partial or no vaporization is observed with a preserved electrical conductivity of the samples.Subramaniam, C., Yamada, T., Kobashi, K. et al. One hundred fold increase in current carrying capacity in a carbon nanotube–copper composite. Nat Commun 4, 2202 (2013).
In present days, the continuous miniaturization of electronic devices comes along with a problematic reduction of their life-time. This is due to the underlying current density being operated increasingly close to the maximum current-carrying capacity (ampacity) of the materials (copper, gold...) used in the conduction channels of micro-circuitry. In this respect, there is a growing attention for new materials with higher ampacity, and copper-carbon nanotube (CNT) composites could constitute a promising alternative. The interest of such copper-carbon composites relies on the combination of the complementary properties of both materials: the high conductivity of copper and the high ampacity of CNT. However, the fabrication of an efficient Cu-CNT composite still remains a huge challenge and, up to now, the metal filling of a CNT hydrophobic matrix using electrochemical methods systematically requires an organic solvent based solution, which is not industrially and ecologically friendly. This constitutes an important drawback of those types of fabrication paths. A new promising way to fabricate such a composite by electrochemistry is shown in our work (see figure 1). It is based on a copper doped polycatecholamine coating of CNT. The coated CNT are deposited to form a matrix and the interstices between CNT are then filled with metallic copper by using an electrochemical step in aqueous solution. In this context, it is relevant to study how the coating impacts the CNT surface conductivity. In this respect, we characterize the CNT coating resistance before and after thermal annealing using C-AFM. Combined SEM and STEM images show the apparition of well dispersed nanoparticles on the CNT surface after thermal annealing. The change of nuclei density and their size distribution is also characterized in function of the annealing temperature. Finally, we use XPS and DSC to show that annealing of copper doped polycatecholamine coated CNT is, in fact, able to promote the reduction of Cu(II) into Cu(I) and Cu(0). Figure 1
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.