Enhanced electrical conductivity and hardness of silver-nickel composites by silver-coated multi-walled carbon nanotubes

Dongmok Lee; Jeonghyun Sim; Wonyoung Kim; Chuldong Moon; Wookdong Cho; Seunghyun Baik

doi:10.1088/0957-4484/26/29/295705

Enhanced electrical conductivity and hardness of silver-nickel composites by silver-coated multi-walled carbon nanotubes

Dongmok Lee, Jeonghyun Sim, Wonyoung Kim, Chuldong Moon, Wookdong Cho, Seunghyun Baik

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

We investigated electrical conductivity and Vickers hardness of Ag- and Ni-based composites prepared by powder metallurgy involving spark plasma sintering. The starting composition was Ag:Ni = 61:39 vol%, which provided an electrical conductivity of 3.30 × 10⁵ S cm^-1 and a hardness of 1.27 GPa. The addition of bare multi-walled carbon nanotubes (MWNTs, 1.45 vol%) increased hardness (1.31 GPa) but decreased electrical conductivity (2.99 × 10⁵ S cm^-1) and carrier mobility (11 cm² V^-1 s^-1) due to the formation of Ni₃C in the interface between the MWNTs and Ni during spark plasma sintering. The formation of Ni₃C was prevented by coating the surface of the nanotubes with Ag (nAgMWNTs), concomitantly increasing electrical conductivity (3.43 × 10⁵ S cm^-1) and hardness (1.37 GPa) of the sintered specimen (Ag:Ni:nAgMWNTs = 59.55:39:1.45 vol%). The electrical contact switching time (133 357) was also increased by 30%, demonstrating excellent feasibility as electrical contact materials for electric power industries.

Original language	English
Article number	295705
Journal	Nanotechnology
Volume	26
Issue number	29
DOIs	https://doi.org/10.1088/0957-4484/26/29/295705
State	Published - 24 Jul 2015

Keywords

carbon nanotubes
electrical conductivity
electrical contact materials
silver-nickel composites
Vickers hardness

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10.1088/0957-4484/26/29/295705

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title = "Enhanced electrical conductivity and hardness of silver-nickel composites by silver-coated multi-walled carbon nanotubes",

abstract = "We investigated electrical conductivity and Vickers hardness of Ag- and Ni-based composites prepared by powder metallurgy involving spark plasma sintering. The starting composition was Ag:Ni = 61:39 vol\%, which provided an electrical conductivity of 3.30 × 105 S cm-1 and a hardness of 1.27 GPa. The addition of bare multi-walled carbon nanotubes (MWNTs, 1.45 vol\%) increased hardness (1.31 GPa) but decreased electrical conductivity (2.99 × 105 S cm-1) and carrier mobility (11 cm2 V-1 s-1) due to the formation of Ni3C in the interface between the MWNTs and Ni during spark plasma sintering. The formation of Ni3C was prevented by coating the surface of the nanotubes with Ag (nAgMWNTs), concomitantly increasing electrical conductivity (3.43 × 105 S cm-1) and hardness (1.37 GPa) of the sintered specimen (Ag:Ni:nAgMWNTs = 59.55:39:1.45 vol\%). The electrical contact switching time (133 357) was also increased by 30\%, demonstrating excellent feasibility as electrical contact materials for electric power industries.",

keywords = "carbon nanotubes, electrical conductivity, electrical contact materials, silver-nickel composites, Vickers hardness",

author = "Dongmok Lee and Jeonghyun Sim and Wonyoung Kim and Chuldong Moon and Wookdong Cho and Seunghyun Baik",

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T1 - Enhanced electrical conductivity and hardness of silver-nickel composites by silver-coated multi-walled carbon nanotubes

AU - Lee, Dongmok

AU - Sim, Jeonghyun

AU - Kim, Wonyoung

AU - Moon, Chuldong

AU - Cho, Wookdong

AU - Baik, Seunghyun

PY - 2015/7/24

Y1 - 2015/7/24

N2 - We investigated electrical conductivity and Vickers hardness of Ag- and Ni-based composites prepared by powder metallurgy involving spark plasma sintering. The starting composition was Ag:Ni = 61:39 vol%, which provided an electrical conductivity of 3.30 × 105 S cm-1 and a hardness of 1.27 GPa. The addition of bare multi-walled carbon nanotubes (MWNTs, 1.45 vol%) increased hardness (1.31 GPa) but decreased electrical conductivity (2.99 × 105 S cm-1) and carrier mobility (11 cm2 V-1 s-1) due to the formation of Ni3C in the interface between the MWNTs and Ni during spark plasma sintering. The formation of Ni3C was prevented by coating the surface of the nanotubes with Ag (nAgMWNTs), concomitantly increasing electrical conductivity (3.43 × 105 S cm-1) and hardness (1.37 GPa) of the sintered specimen (Ag:Ni:nAgMWNTs = 59.55:39:1.45 vol%). The electrical contact switching time (133 357) was also increased by 30%, demonstrating excellent feasibility as electrical contact materials for electric power industries.

AB - We investigated electrical conductivity and Vickers hardness of Ag- and Ni-based composites prepared by powder metallurgy involving spark plasma sintering. The starting composition was Ag:Ni = 61:39 vol%, which provided an electrical conductivity of 3.30 × 105 S cm-1 and a hardness of 1.27 GPa. The addition of bare multi-walled carbon nanotubes (MWNTs, 1.45 vol%) increased hardness (1.31 GPa) but decreased electrical conductivity (2.99 × 105 S cm-1) and carrier mobility (11 cm2 V-1 s-1) due to the formation of Ni3C in the interface between the MWNTs and Ni during spark plasma sintering. The formation of Ni3C was prevented by coating the surface of the nanotubes with Ag (nAgMWNTs), concomitantly increasing electrical conductivity (3.43 × 105 S cm-1) and hardness (1.37 GPa) of the sintered specimen (Ag:Ni:nAgMWNTs = 59.55:39:1.45 vol%). The electrical contact switching time (133 357) was also increased by 30%, demonstrating excellent feasibility as electrical contact materials for electric power industries.

KW - carbon nanotubes

KW - electrical conductivity

KW - electrical contact materials

KW - silver-nickel composites

KW - Vickers hardness

UR - https://www.scopus.com/pages/publications/84936127580

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DO - 10.1088/0957-4484/26/29/295705

M3 - Article

AN - SCOPUS:84936127580

SN - 0957-4484

VL - 26

JO - Nanotechnology

JF - Nanotechnology

IS - 29

M1 - 295705

ER -

Enhanced electrical conductivity and hardness of silver-nickel composites by silver-coated multi-walled carbon nanotubes

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