International Journal

Additively Manufactured Mechanical Metamaterial-Based Pressure Sensor with Tunable Sensing Properties for Stance and Motion Analysis
Author
Hang-Gyeom Kim, Sugato Hajra, Howon Lee, Namjung Kim*, Hoe Joon Kim*
Journal
Advanced Engineering Materials
Vol
2201499
Year
2023
File
2023_Adv.Eng.Mat..pdf (12.4M) 0회 다운로드 DATE : 2023-04-24 13:13:02

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Mechanical metamaterials are attracting considerable attention due to theirunique properties not found in natural materials. Advanced geometrical shapessuch as Menger cubes, origami templates, and gyroids offer exciting avenues fordevice engineering. In addition, the recent developments of various additive manufacturing technologies have expanded materials selection and geometrical complexities. Herein, a piezoresistive pressure sensor based on a 3D-printedgyroid structure with a conformal coating of carbon nanotubes (CNTs) is pre-sented. The gyroid structures are printed using fused deposition modeling (FDM)3D printing with thermoplastic polyurethane (TPU), providing mechanical robustness even at low densities. By altering the relative density of the gyroidstructure, Young’s modulus can be tailored, ranging from 0.32 MPa at 30% relative density and 3.61 MPa at 80% relative density. The presented gyroid-based pressure sensor achieves a wide sensing range of up to 1.45 MPa and a high sensitivity of 2.68 MPa​-1. The sensor is integrated into a shoe for wearable applications, demonstrating its mechanical robustness and potential for humanstance and motion monitoring.