Abstract
A hybrid resistor has been fabricated by parallely connecting carbon nanotube (CNT) fiber with negative temperature coefficient of resistance (TCR) and metal alloy with positive TCR to achieve near zero TCR. The CNT fibers were prepared by yarning CNTs grown on the silicone substrate by chemical vapor deposition (CVD) method. The CNT fiber resistors were fabricated by winding CNT fiber on the ceramic rod. Metal terminals were connected at both ends of the CNT fiber wound on the ceramic rod. The metal alloy resistors were fabricated with copper (Cu) and nickel (Ni) with different weight compositions. Electrical resistance and thermal stability (in terms of TCR in this work) of the CNT fiber resistors, the metal alloy resistors, and the hybrid resistors were measured as 7.94 Ω and −870 ppm/°C, 7.94 Ω and 1100 ppm/°C, and 3.97 Ω and −2 ppm/°C, respectively. In case of parallelly connected resistors with suitable combination, the resistance was lower than that of resistor with lower value, and the TCR approached to near zero. Finally, we propose a theoretical approach for adjusting resistance and TCR of the hybrid resistor composed of metal alloy and CNT fibers.
Highlights
As IT technologies advances, network based portable devices, sensors and secondary batteries have attracted great attention in the worldwide market[1]
temperature coefficient of resistance (TCR) of the four carbon nanotube (CNT) fiber resistors were calculated by resistance change over temperature change from 25 to 125 °C by using the Eq (1), and were showed in inset of the Fig. 3(b)
We proposed a novel approach for fabricating resistors with near zero TCR by parallelly connecting CNT fiber with negative TCR and metal alloy with positive TCR
Summary
Four CNT resistor samples with negative TCR were connected parallelly with six metal alloy resistors with same resistance with positive TCRs between 400 to 1300 ppm/°C, resulting in 24 combinations of hybrid resistors. In the actual case of the CNT resistor sample #1 with 7.94 Ω and −870 ppm/°C, expected resistance increase for the metal alloy resistor by increasing temperature from 25 to 125 °C would be 0.69 Ω, and expected resistance decrease for the CNT fiber. The hybrid resistors showed the near zero TCR at around 1100 ppm/°C for the metal alloy resistors. The hybrid resistor composed of the metal alloy resistor and the CNT fiber resistor showed near zero TCR with thermal stability
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