研究目的
To fabricate a highly sensitive and flexible strain sensor using laser-induced graphene (LIG) patterns for applications in human motion monitoring.
研究成果
The LIG strain sensor demonstrated high sensitivity, fast response speed, high linearity, and low hysteresis, making it suitable for applications in human motion monitoring. The sensor's performance could be adjusted based on the degree of carbonization and embedding of the pattern.
研究不足
The study was limited by the mechanical properties of PDMS, which was destroyed after a strain of 30%. The degree of carbonization and embedding of the pattern also influenced the sensor's performance.
1：Experimental Design and Method Selection:
The study employed a 355 nm UV pulsed laser to fabricate LIG on a polyimide film, which was then applied as a strain sensor. The methodology included structural analysis via Raman spectroscopy and SEM imaging, and electrical-mechanical coupled testing.
2：Sample Selection and Data Sources:
A 25 μm-thick polyimide film was used for better implantation of the LIG pattern in PDMS. The degrees of implantation and carbonization were evaluated according to laser fluence.
3：List of Experimental Equipment and Materials:
Equipment included a 355 nm UV pulsed laser, micro Raman spectrometer (NRS-5100), and sourcemeter (Keithley?, sourcemeter 2450). Materials included polyimide film (DuPont? Kapton?HN) and PDMS.
4：0). Materials included polyimide film (DuPont? Kapton?HN) and PDMS.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The LIG pattern was fabricated by direct laser writing (DLW) method, implanted on a flexible PDMS substrate, and protected with PDMS. The sensor's response to strain was measured through bending and tension.
5：Data Analysis Methods:
The change in electrical resistance to strain was measured, and the gauge factor was calculated to evaluate the sensor's sensitivity.
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