Wearable transparent thermal sensors and heaters based on metal-plated fibers and nanowires†,Nanoscale

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Wearable transparent thermal sensors and heaters based on metal-plated fibers and nanowires†
Nanoscale ( IF 5.8 ) Pub Date : 2018-10-18 00:00:00 , DOI: 10.1039/c8nr04810j
Hong Seok Jo _{1,

2,

3,

4} , Hyuk-Jin Kwon _{1,

2,

3,

4} , Tae-Gun Kim _{1,

2,

3,

4} , Chan-Woo Park _{1,

2,

3,

4} , Seongpil An _{1,

2,

3,

4,

5} , Alexander L. Yarin _{1,

2,

3,

4,

5} , Sam S. Yoon _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

基于镀金属纤维和纳米线的可穿戴透明热传感器和加热器†

电金属镀覆纳米纤维和超音速喷射纳米线被用来表现出0.18Ω平方优异低薄层电阻编造杂化薄膜^-1，91.1％的透明度，和2.315Ω的数字品质因数^-1。该膜适合用作热传感器和加热器。这样的混合透明导电膜是高度柔性的并且因此是可穿着的。它们可用作体温监测器和加热器。所采用的混合方法改善了薄层电阻，将其减小到最小，同时保持了透明性。另外，薄膜的低薄层电阻有利于用低压电池为其供电，从而便于携带。对于具有各种薄层电阻和透明度的此类膜，证明了其热感测和加热能力。温度感应是通过薄膜的电阻变化来实现的。电阻值转换回温度。感测性能随着薄层电阻的提高而增加。电阻率温度系数为TCR = 0。^-1。金属镀的纳米纤维和纳米线的均匀分布导致均匀的焦耳加热，从而有助于从加热器到周围环境的有效对流传热，这表现为对流传热系数的提高。

更新日期：2018-10-18

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