首页|Flexible thermocouple using a thermoelectric graphene fiber with a seamless junction

Flexible thermocouple using a thermoelectric graphene fiber with a seamless junction

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Temperature is an important physical variable that indicates the condition of the human body and ar-tificial systems.Advanced wearable applications require the development of temperature sensors with different form factors.In this study,a fiber-shaped thermoelectric temperature sensor is fabricated using a continuous graphene fiber whose two halves possess different reduction states.A seamless junction is formed by partially reducing a wet-spun graphene oxide fiber with hydroiodic acid(HI)solutions of different concentrations.One-half of the fiber is mildly reduced with 0.97 wt％HI,while the other half is highly reduced with 30.6 wt％HI.The different reduction states of the graphene composite fiber re-sult in different Seebeck coefficients,allowing for the fabrication of a fiber-shaped graphene thermocou-ple without any laborious assembly.The flexible graphene thermocouple exhibits high sensitivity with a thermopower of 12.5 μV K-1 in the temperature range of room temperature to～70 ℃.Furthermore,it exhibits high linearity with a correlation coefficient exceeding 0.995 and fast response with a time constant of 0.24 s.Owing to its mechanical robustness and flexibility,the stand-alone graphene ther-mocouple can be knitted into a cotton fabric glove,which presents a fast response to environmental changes without any external power source.This work offers a unique fabrication method for producing a high-performance,flexible thermocouple that features a seamless and clear junction without the use of additional materials.This alternative method eliminates the complicated assembly processes typically required for conventional thermocouples.

Graphene fiberThermocoupleReduced graphene oxideFlexible temperature sensorSeebeck coefficient

Seungwon Kim、Soomook Lim、Myeong Hee Jeong、Wonjoon Kim、Seunghyun Baik、Ji Won Suk

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School of Mechanical Engineering,Sungkyunkwan University,Suwon,Gyeonggi-do 16419,Republic of Korea

Department of Smart Fab.Technology,Sungkyunkwan University,Suwon,Gyeonggi-do 16419,Republic of Korea

SKKU Advanced Institute of Nanotechnology(SAINT),Sungkyunkwan University,Suwon,Gyeonggi-do 16419,Republic of Korea

National Research Foundation of Korea(NRF)grant funded by the Ministry of Science and ICTNational Research Foundation of Korea(NRF)grant funded by the Ministry of Science and ICTNational Research Foundation of Korea(NRF)grant funded by the Ministry of Science and ICTKorea Institute of Industrial Technology

2022R1A2B5B020024132022R1A4A10311822019R1A2C2089785kitech JA-20-0001

2024

10.1016/j.jmst.2023.05.078

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.172(5)
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