Achieving a continuously adjustable micro−nanostructure of sensing materials is crucial and still a challenge for the flexible pressure sensor. We proposed a new method to prepare ultrathin ordered nanocone array films by designing tunable tapered anodized aluminum oxide templates and to prepare highly sensitive flexible pressure sensors by the interlocking nanocone arrays. Meanwhile, the theoretical prediction model of the sensitivity of interlocked nanocone arrays is proposed, and its result shows that the resistance change rate is positively correlated with the height of interlocked nanocone arrays and the contact area between interlocked nanocones. According to the finite element simulation and experimental results, the interlocked ordered nanocone array pressure sensor exhibits a high sensitivity of 268.36 kPa −1 in the pressure range of 0−200 Pa, an ultralow detection limit of 0.98 Pa, a fast response/recovery time of 48/56 ms, a low hysteresis of ±3.156%, stability under 5000 cycles of loading, and continuity and repeatability under different loads and loading speeds. Furthermore, the pressure sensor can accurately monitor weak wind velocities, wrist torsion and bending movement, and book opening and closing angles. The sensor has broad application prospects in wearable medical monitoring, electronic skin, and human−computer interaction.
In this article, the silver-plated polyamide fabrics (SPPAFs) with high electroconductibility and shielding effectiveness were fabricated by using in situ reduction of polydopamine and chemical silvering. The effects of SPPAFs dopamine (C 8 H 11 O 2 N) and silver nitrate (AgNO 3 ) concentration on surface resistivity and electromagnetic interference shielding effectiveness were studied. The results showed that the surface resistivity of SPPAFs can reach a minimum value of 0.06 AE 0.014 Ω cm −1 , when C 8 H 11 O 2 N concentration is 4 g L −1 and the AgNO 3 concentration is 120 g L −1 . The shielding effectiveness of SPPAFs in the wide frequency range of 10-3000 MHz increases with the increase in the concentration of AgNO 3 , and increases first and stabilizes afterward with increasing C 8 H 11 O 2 N concentration. When the concentration of C 8 H 11 O 2 N and AgNO 3 is 3 and 120 g L −1 , respectively, mean shielding effectiveness values in the low-, medium-, and highfrequency bands are 71.3, 73.8, and 76.1 dB, respectively. Moreover, the mean shielding effectiveness values is 83.79 dB in the frequency range of 1.2-2.3 GHz. The dominant shielding mechanism of SPPAFs is the reflected electromagnetic waves and the absorption shielding effectiveness is less than 2 dB. The average electromagnetic shielding values of SPPAFs are above 67 dB after 16 weeks of storage, when C 8 H 11 O 2 N concentration is 4 g L −1 and the AgNO 3 concentration is 80 and 100 g L −1 . The prepared SPPAFs show promising applications in military textiles and smart wearable clothing.
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