研究目的
To develop a stretchable graphene film sensor capable of detecting both lateral and vertical strains in a single sensor element, addressing the limitation of current sensors that can only detect one type of strain.
研究成果
The developed graphene film sensor demonstrates high sensitivity and stretchability for detecting both lateral and vertical strains in a single sensor element. Its unique architecture and use of GNP particles enable broad detection ranges and stable electrical responses, making it a promising candidate for applications requiring multifunctional strain sensing.
研究不足
The response time for relaxation after strain application is relatively slow (~50 s), which may limit the sensor's use in applications requiring rapid repeated operations. Additionally, the sensor's performance under extreme conditions beyond the tested ranges (e.g., strains >150%, pressures >20,000 Pa) was not explored.
1：Experimental Design and Method Selection:
The sensor was fabricated using a spray-coating method to create percolative networks of graphene nanoplatelet (GNP) on a PDMS substrate, serving as both the strain-sensing channel and electrode.
2：Sample Selection and Data Sources:
GNP particles were used for their electrical and mechanical properties, with the PDMS substrate chosen for its biocompatibility and stretchability.
3：List of Experimental Equipment and Materials:
Equipment included a spray nozzle, hot plate, stretching stage, micro-position controller, and NI precision system SMU for electrical data collection. Materials included GNP particles, PDMS, and DMF solutions.
4：Experimental Procedures and Operational Workflow:
The GNP suspension was spray-coated onto the PDMS substrate, followed by assembly of a thin PDMS protecting layer. Electrical responses to lateral and vertical strains were measured.
5：Data Analysis Methods:
The gauge factor for lateral strain and pressure sensitivity for vertical strain were calculated from resistance changes.
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