IMPROVING THE COPPER NANOWIRE FILTERING PROCESS  BY ADDING A PHASE SEPARATION FILTRATION STEP

Nguyễn Thị Hồng Nhung; Nguyễn Thị Lan; Nguyễn Duy Cường

doi:10.34238/tnu-jst.13031

IMPROVING THE COPPER NANOWIRE FILTERING PROCESS BY ADDING A PHASE SEPARATION FILTRATION STEP

About this article

Received: 11/06/25 Revised: 14/11/25 Published: 18/11/25

Authors

1. Nguyen Thi Hong Nhung, Hanoi University of Science and Technology
2. Nguyen Thi Lan, Hanoi University of Science and Technology
3. Nguyen Duy Cuong , Hanoi University of Science and Technology

Abstract

In this study, copper nanowires (CuNWs) were successfully synthesized via a simple hydrothermal method. However, the obtained product contained nanowires and nanoparticles due to the difficulty in controlling the Cu nucleation process. To obtain high-purity CuNWs, a phase separation filtration step was introduced during the washing process. After sedimentation under gravity, the final product consisted solely of pure CuNWs, with no remaining copper nanoparticles. The resulting CuNWs had diameters ranging from 40 nm to 60 nm and lengths of up to 150 µm. Notably, the electrical and optical properties of the CuNWs electrode were significantly improved, as the nanoparticle impurities do not contribute to electrical conductivity. Specifically, the sheet resistance decreased from 40.5 Ω/□ to 25.8 Ω/□ and the transmittance increased from 79.23% to 86.80% at a wavelength of 550 nm. These results indicate that phase-separation filtration combined with sedimentation under gravity is a promising approach for obtaining high-purity CuNWs.

Keywords

Transparent conductive electrodes; Copper nanowires; Separation filtration; Hydrothermal; Doctor-blade

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DOI: https://doi.org/10.34238/tnu-jst.13031

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