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摘要
The flexible thermoplastic polyurethane sheets with the single- and dual-level microcol-umn arrays were rapidly prepared by using injection-compression molding with two different template design schemes. The microstructured flexible sensing substrates were obtained after cutting the sheets and spraying gold layer on them. The flexible pressure sensors were prepared by assembling the sens?ing substrates with the single-/dual-level microcolumns and the flat sensing substrate face-to-face, which were denoted as sensor 1 and sensor 2, respectively. The simulated results show that higher contact stress appeares around the edges on the top surfaces of the microcolumns under pressure. The longitudinal sections of the single- and dual-level microcolumns under pressure exhibit ' bowl and bud geometries, respectively. The dual-level microcolumn can be deformed under lower pressure, and the contact deformation and contact area with the flat sensing substrate under pressure are larger. Therefore, compared to sensor 1 , sensor 2 exhibits a higher sensitivity(0.53 kPa ' ,0 - 1 kPa) , shor?ter response time/relaxation time(100ms/80 ms) , lower detection limit(about 58 Pa). Sensor 2 has a wide detection range(0.058 - 600 kPa)and maintaines a relatively stable piezoresistive response in 4000 cycles of compression/release tests(under a peak pressure of about 500 kPa) , which is ascribed to higher pressure resistance of the microcolumn. Sensor 2 may accurately detect human pulse, vocalisa?tion and movement, demonstrating its potential for smart wearable applications. ? 2023 China Mechanical Engineering Magazine Office.
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