Fabrication and Decoupling of LIG/PDMS Temperature Strain Sensors

GU Jintao; GENG Ting; DENG Lin; ZHU Tingxuan; XU Guangyi; LIU Fu

doi:10.19554/j.cnki.1001-3563.2026.05.004

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (5) : 27-35. DOI: 10.19554/j.cnki.1001-3563.2026.05.004

Advanced Materials

Fabrication and Decoupling of LIG/PDMS Temperature Strain Sensors

GU Jintao¹, GENG Ting¹, DENG Lin², ZHU Tingxuan¹, XU Guangyi¹, LIU Fu^1,*

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Abstract

To solve the problems of temperature and strain coupling interference and narrow high temperature detection range of the existing LIG based sensor, the work aims to clarify the temperature sensitive mechanism of LIG/PDMS composites, reveal theeffect of temperature on the core performance of the sensor and establish the coupling signal decoupling model to realize the accurate detection of temperature and strain in a wide temperature range. The LIG/PDMS flexible sensor was prepared by laser-induced method. The material properties were characterized by four-point probe measurement, SEM, and Raman spectroscopy. Combined with temperature-resistance test, strain test, and frequency response test, the regulatory effect of temperature on the sensor performance was systematically analyzed.It was determined that 5 W scanning power and 200 μm scanning spacing were the optimal preparation parameters, and the LIG square resistance was the lowest, reaching 5.56 Ω/sq. The temperature response of the composite was due to the thermal expansion effect of PDMS, and ΔR/R₀ had a good linear correlation with temperature in the range of 25-214 ℃ (R²=99.24%). When the strain sensitivity of the sensor was 83.6 at room temperature, at 100 ℃, the effect factor of temperature on the strain sensitivity was 0.027 8. The temperature had little effect on the detection frequency, and the hysteresis of the sensor below 100 ℃ was less than 5%. In this study, high-performance LIG/PDMS composites are successfully prepared, and the regulation mechanism of temperature on the sensor performance is clarified. The established decoupling model realizes effective decoupling at the temperature of 25-214 ℃ and the strain of 0-50%, which provides a scheme for multi physical quantity sensing in complex environments.

Key words

laser-induced graphene / flexible strain sensor / temperature strain decoupling / sensitivity / frequency / hysteresis effect

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GU Jintao, GENG Ting, DENG Lin, ZHU Tingxuan, XU Guangyi, LIU Fu. Fabrication and Decoupling of LIG/PDMS Temperature Strain Sensors[J]. Packaging Engineering. 2026, 47(5): 27-35 https://doi.org/10.19554/j.cnki.1001-3563.2026.05.004

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