Lee Sunwoo, Kim Eun-Min, Lim Youngtaek
Department of Electrical Information, Inha Technical College, Incheon, 22212, Korea.
Electric Power Research Institute, Seoul National University, Seoul, 08826, Korea.
Sci Rep. 2019 May 23;9(1):7763. doi: 10.1038/s41598-019-44182-7.
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.
通过将具有负电阻温度系数（TCR）的碳纳米管（CNT）纤维与具有正TCR的金属合金并联连接，制备了一种混合电阻器，以实现接近零的TCR。CNT纤维是通过化学气相沉积（CVD）法将生长在硅基板上的CNT纺丝制备而成。CNT纤维电阻器是通过将CNT纤维缠绕在陶瓷棒上制成的。金属端子连接在缠绕在陶瓷棒上的CNT纤维的两端。金属合金电阻器是用不同重量组成的铜（Cu）和镍（Ni）制成的。测量了CNT纤维电阻器、金属合金电阻器和混合电阻器的电阻和热稳定性（在本工作中用TCR表示），分别为7.94Ω和-870ppm/°C、7.94Ω和1100ppm/°C以及3.97Ω和-2ppm/°C。对于以合适组合并联连接的电阻器，其电阻低于较低值电阻器的电阻，并且TCR接近零。最后，我们提出了一种理论方法来调节由金属合金和CNT纤维组成的混合电阻器的电阻和TCR。
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