Preparation and oxidation behaviour of cobalt‐coated copper powder. (1st October 2017)

• Record Type: Journal Article
• Authors: Oh, Sang Joo; Lee, Jong‐Hyun
• Is Part Of: Micro & nano letters. Volume 12:Number 10(2017)
• Page Start: 717
• Page End: 721
• Publication Date: 2017-10-01
• Subjects: oxidation -- copper -- powders -- cobalt -- particle size -- electroless deposited coatings -- crystal microstructure -- heat treatment -- porous materials -- surface diffusion; cobalt‐coated copper powder preparation -- spherical copper particle size -- electroless plating -- acid bath -- Co‐coated Cu particle preparation -- core–shell structure -- heating -- microstructural change -- porous cobalt oxide shell -- copper oxidation -- temperature 600 degC; Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mnl.2017.0086
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract : Spherical copper (Cu) particles with an average particle size of ∼2 µm were coated with cobalt (Co) via electroless plating in an acid bath to prepare Co‐coated Cu particles. The prepared particles maintained the initial core–shell structure even under heating up to 350°C in air. However, as the temperature exceeded 350°C, oxide phases of the Co3 O4, CuO, and Cu2 O phases were formed with microstructural change. Immediately after the oxidation of the Co shell, out‐diffusion of the Cu core through the relatively porous cobalt oxide shell and copper oxidation occurred, thereby forming the outermost copper oxide shell. At 400°C, the copper oxide shell grew and the destruction of the cobalt oxide shell oxidised the edge region of an initial copper core. At the highest temperature of 600°C, a hole was formed at the centre of a particle due to excess out‐diffusion of Cu.