School of Mechanical Engineering, Korea University, Seoul 02841, Republic of Korea.
Nanoscale. 2018 Nov 1;10(42):19825-19834. doi: 10.1039/c8nr04810j.
Electrospun metal-plated nanofibers and supersonically sprayed nanowires were used to fabricate hybrid films exhibiting a superior low sheet resistance of 0.18 Ω sq-1, a transparency of 91.1%, and a figure-of-merit of 2.315 Ω-1. The films are suitable to serve as thermal sensors and heaters. Such hybrid transparent conducting films are highly flexible and thus wearable. They can be used as body-temperature monitors and heaters. The employed hybrid approach improved the sheet resistance diminishing it to a minimum, while maintaining transparency. In addition, the low sheet resistance of the films facilitates their powering with a low-voltage battery and thus, portability. The thermal sensing and heating capabilities were demonstrated for such films with various sheet resistances and degrees of transparency. The temperature sensing was achieved by the resistance change of the film; the resistance value was converted back to temperature. The sensing performance increased with the improvement in the sheet resistance. The temperature coefficient of resistivity was TCR = 0.0783 K-1. The uniform distribution of the metal-plated nanofibers and nanowires resulted in a uniform Joule heating contributing to an efficient convection heat transfer from the heaters to the surrounding, demonstrated by an improved convective heat transfer coefficient.
电纺金属镀膜纳米纤维和超声喷涂纳米线被用来制造混合薄膜，其具有卓越的低面电阻 0.18 Ω sq-1、91.1%的透明度和 2.315 Ω-1 的品质因数。这些薄膜适合用作热敏传感器和加热元件。这种混合透明导电薄膜具有高度的柔韧性，因此可以穿戴。它们可以用作体温监测器和加热器。所采用的混合方法降低了薄膜的面电阻，使其达到最低水平，同时保持了透明度。此外，薄膜的低面电阻使其可以通过低压电池供电，从而实现便携性。通过具有不同面电阻和透明度的薄膜展示了其热感应和加热功能。通过薄膜的电阻变化来实现温度感应；电阻值被转换回温度。感应性能随面电阻的提高而提高。电阻率温度系数 TCR = 0.0783 K-1。金属镀膜纳米纤维和纳米线的均匀分布导致焦耳加热均匀，有助于从加热器到周围环境的有效对流热传递，这通过改进的对流换热系数得到了证明。
