摘要
液态金属印刷电子学作为正在兴起的电子直写技术,在各类柔性电子电路、光电传感器乃至能量捕获器的快速制造上已显示出较大的发展潜力.提出基于液态金属电子墨水的可印刷式热电发生器概念,并由此研制了对应的集成器件.特别以镓-康铜热电偶及镓-镓铟合金热电偶为代表,系统评估了采用液态金属直写方法制作的液-固、液-液两类组合模式的热电偶及热电堆的热电性能,并筛选出合适的配对材料;继而将20对镓-康铜热电偶集成为热电发生器,对其输出电压予以放大后得到1.59 V的负载电压和70.44?W的功率,可成功驱动LED灯.在此基础上,进一步地将镓膜层的厚度从10?m提升至800?m,由此将负载电压和功率增至1.70 V和742.9?W,幅度分别达到6.92%和955%.以上一系列基础和应用实验证明了液态金属直写式热电发生器用于热量捕获的实用价值.
As the newly emerging direct writing technology, the liquid metal printed electronics is showing large promising potential in quickly manufacturing a variety of flexible electronics and circuits, optoelectronic sensors as well as energy harvesting devices etc. Here, the concept of liquid metal enabled directly printable thermoelectric generator was proposed for the first time and an integrated prototype device was fabricated. Taking thermocouple and thermopile directly made of gallium-constantan or gallium-Gain alloy as typical examples, the thermoelectric performances of these two kinds of devices made of liquid-solid or liquid-liquid components were systematically evaluated and appropriate matching materials were identified. Further, 20 gallium-constantan thermocouples were integrated together as a thermoelectric generator. Through magnifying its output electric voltage, this device could offer a load voltage of 1.59 V and a power of 70.44 μW which is capable of driving a LED lamp. In addition, when the gallium film depth was improved from its original 10 to 800 μm, significantly improved load voltage of 1.70 V and power of 742.9 μW were obtained with increasing ratio as 6.92% and 955%, respectively. The present experiments demonstrated the practical values of the liquid metal based printed thermoelectric generator in harvesting thermal energy.
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2014年第4期407-416,共10页
Scientia Sinica(Technologica)
基金
国家重点基础研究发展计划("973"计划)(批准号:2010CB227303)资助项目
关键词
热电发生器
热量捕获
印刷电子学
液态金属
直写技术
thermoelectric generator, heat harvesting, printed electronics, liquid metal, direct writing technology
