Issue 12, 2022

The role of surface oxides and stabilising carboxylic acids of copper nanoparticles during low-temperature sintering

Abstract

This article provides a detailed discussion of 1-hexanoic-acid-stabilised copper nanoparticles with an average diameter of ∼80 nm prepared from cupric oxide micro-powders for low-temperature sintering applications. The obtained fine particles were dispersed in dipropylene glycol using a bead mill to obtain a stable paste containing 50 wt% copper. Sintering experiments at temperatures in the range of 120–250 °C were performed under a nitrogen or 3%H2–N2 gas flow. The lowest resistivity, approximately three times that of bulk copper, was obtained at 250 °C. These particles exhibited good conductivity upon sintering under nitrogen only. 1-Hexanoic acid contributed to the acceleration of sintering by removing the Cu64O oxide layer of the particles and activating the surface. The dispersed copper paste and the copper layer after sintering were observed using SEM.

Graphical abstract: The role of surface oxides and stabilising carboxylic acids of copper nanoparticles during low-temperature sintering

Supplementary files

Article information

Article type
Paper
Submitted
25 Dec. 2021
Accepted
04 Apr. 2022
First published
05 Apr. 2022
This article is Open Access
Creative Commons BY license

Mater. Adv., 2022,3, 4802-4812

The role of surface oxides and stabilising carboxylic acids of copper nanoparticles during low-temperature sintering

R. Tokura, H. Tsukamoto, T. Tokunaga, M. T. Nguyen and T. Yonezawa, Mater. Adv., 2022, 3, 4802 DOI: 10.1039/D1MA01242H

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