Contact resistance of multi-walled carbon nanotube/natural rubber nanocomposites with metallic ball

Abstract This paper reports on the contact resistance ( R c ) between carbon filler/natural rubber (NR) nanocomposite and gold ball: three varieties of nanocomposites were prepared from carbon black (CB) and two kinds of multi-walled carbon nanotubes (MWCNTs) with different diameter. R c of MWCNT/NR nanocomposite was remarkably less than that of CB/NR nanocomposites. The relationship between R c of MWCNT/NR nanocomposites and applied load was expressed in the formula, R c = C · P − n ( P : load, C and n : constant): for the MWCNTs (diameters of 13 nm)/NR and MWCNTs (diameters of 67 nm)/ NR nanocomposites, they were expressed as R c =1724· P −0.6 and R c =344· P −0.37 , respectively. The former (MWCNT, ϕ 13 nm) showed higher R c than the latter (MWCNT, ϕ 67 nm) over whole region of applied load. The mechanical hardness of the former was higher (90 HsA) than that of the latter (82 HsA). Therefore, the smaller contact area between the nanocomposite and gold ball of the former resulted in higher R c . The apparent specific contact resistivity was calculated from the observed values of R c and contact area: 130 Ω mm 2 and 127 Ω mm 2 for the former (MWCNT, ϕ 13 nm) and the latter (MWCNT, ϕ 67 nm), respectively.

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