The flexible nitrogen-doped reduced graphene oxide/thermoplastic polyurethane (N-rGO/TPU) linear thermosensitive film is synthesized via a straightforward ultrasonic-assisted solution mixing process followed hydrothermal treatment. N-rGO is uniformly dispersed in the TPU film and formed conductive paths, which constructs an excellent three-dimensional conductive network. 2 wt% N-rGO/TPU sensor boasts high precision (0.1℃), excellent sensitivity TCR (temperature coefficient of resistance) of 2.81%/℃ range from 20℃ to 45℃, and robust deformation resilience. Human body temperature measurement is carried out, which can track the changes of human body temperature in real time. This work provides a new idea for the application of graphene materials in flexible temperature sensor.

Linear negative temperature coefficient effect exhibited by highly flexible thermosensitive film from N-Doped rGO/TPU composites
    Abstract
    1 Introduction
    2 Results and discussion
        2.1 Characterization of N-rGO/TPU structure
        2.2 Electrical properties of N-rGO/TPU
        2.3 Reliability and application verification of N-rGO/TPU sensor
    3 Conclusion
    4 Experimental section
    References

• Wenwen Kong(Key Laboratory of Functional Materials and Devices for Special Environments of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, 40-1 South Beijing Road, Urumqi 830011, China)
• Xinmiao Wang(Key Laboratory of Functional Materials and Devices for Special Environments of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, 40-1 South Beijing Road, Urumqi 830011, China, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China)
• Jun Min(School of Chemistry and Chemical Engineering, State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China)
• Jianpeng Zhu(School of Chemistry and Chemical Engineering, State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China)
• Junlu Gao(School of Chemistry and Chemical Engineering, State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China)
• Shuhui Huo(School of Chemistry and Chemical Engineering, State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China)
• Long Chen(School of Chemistry and Chemical Engineering, State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China) Corresponding author