부산대학교 도서관

As science and related technology has developed, the human lifespan has increased and interests in health also increased naturally. Thermometry of human skin is critical information that provides important aspects of human health and physiology. Therefore, accurate and continuous body temperature measurement is required for the observation of physical abnormalities. However, rigid conventional thermometers are uncomfortable for long-term use mounted on the human body because of their bulky and heavy features. In this work, I fabricated a flexible, stretchable array-type temperature sensor using graphene-based material, which can be laminated onto the skin directly. Furthermore, I controlled the degree of graphene oxide (GO) reduction and tuned the number of oxygen contents to enhance the temperature sensitivity. Therefore, the sensor exhibited an excellent sensitivity of 2.085 % ˚C−1. The overall device was designed in a wavy meander shape on a silicone elastomer to provide stretchability for the device and prevent delamination so that precise and continuous detection of skin temperature can be performed. During the fabrication process, polyimide film was coated on top of the partially reduced graphene oxide (PrGO) to secure the chemical and mechanical stability of the device. In addition, the array-type sensor enabled spatial heat mapping with a high resolution. Finally, I introduced some practical applications of skin temperature sensing, suggesting the possibility of skin thermography, healthcare monitoring, human-machine interface, and more.