Wang Chenying, Zhang Yuxin, Han Feng, Jiang Zhuangde
School of Instrument Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Micromachines (Basel). 2023 Sep 28;14(10):1853. doi: 10.3390/mi14101853.
Graphene, as a novel thermoelectric (TE) material, has received growing attention because of its unique microstructure and excellent thermoelectric properties. In this paper, graphene fibers (GFs) are synthesized by a facile microfluidic spinning technique using a green reducing agent (vitamin C). The GFs have the merits of high electrical conductivity (2448 S/m), high flexibility, and light weight. Further, a flexible temperature sensor based on GF and platinum (Pt) with a sensitivity of 29.9 μV/°C is proposed, and the thermal voltage output of the sensor can reach 3.45 mV at a temperature gradient of 120 °C. The sensor has good scalability in length, and its sensitivity can increase with the number of p-n thermocouples. It has good cyclic stability, repeatability, resistance to bending interference, and stability, showing great promise for applications in real-time detection of human body temperature.
石墨烯作为一种新型热电材料，因其独特的微观结构和优异的热电性能而受到越来越多的关注。本文采用绿色还原剂（维生素C）通过简便的微流控纺丝技术合成了石墨烯纤维（GFs）。GFs具有高电导率（2448 S/m）、高柔韧性和轻质的优点。此外，还提出了一种基于GF和铂（Pt）的柔性温度传感器，其灵敏度为29.9 μV/°C，在120 °C的温度梯度下传感器的热电压输出可达3.45 mV。该传感器在长度上具有良好的可扩展性，其灵敏度可随p-n热电偶的数量增加而提高。它具有良好的循环稳定性、重复性、抗弯曲干扰性和稳定性，在人体体温实时检测应用中显示出巨大的潜力。
