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首页> 外文期刊>Advanced Functional Materials >Flexible Piezoelectric Touch Sensor by Alignment of Lead-Free Alkaline Niobate Microcubes in PDMS
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Flexible Piezoelectric Touch Sensor by Alignment of Lead-Free Alkaline Niobate Microcubes in PDMS

机译：通过在PDMS中对准无铅碱性铌酸盐微立方体的柔性压电触摸传感器

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摘要

A highly sensitive, lead-free, and flexible piezoelectric touch sensor is reported based on composite films of alkaline niobate K0.485Na0.485Li0.03NbO3 (KNLN) powders aligned in a polydimethylsiloxane (PDMS) matrix. KNLN powder is fabricated by solid-state sintering and consists of microcubes. The particles are dispersed in uncured PDMS and oriented by application of an oscillating dielectrophoretic alignment field. The dielectric constant of the composite film is almost independent of the microstructure, while upon alignment the piezoelectric charge coefficient increases more than tenfold up to 17 pC N-1. A quantitative analysis shows that the origin is a reduction of the interparticle distance to under 1.0 mu m in the aligned bicontinuous KNLN chains. The temperature stable piezoelectric voltage coefficient exhibits a maximum value of 220 mV m N-1, at a volume fraction of only 10%. This state-of-the-art value outperforms bulk piezoelectric ceramics and composites with randomly dispersed particles, and is comparable to the values reported for the piezoelectric polymers polyvinylidenefluoride and its random copolymer with trifluoroethylene. Optimized composite films are incorporated in flexible piezoelectric touch sensors. The high sensitivity is analyzed and discussed. As the fabrication technology is straightforward and easy to implement, applications are foreseen in flexible electronics such as wireless sensor networks and biodiagnostics.
机译：据报道，基于排列在聚二甲基硅氧烷（PDMS）基质中的碱性铌酸钾K0.485Na0.485Li0.03NbO3（KNLN）粉末的复合膜，可实现高度灵敏，无铅且柔性的压电触摸传感器。 KNLN粉末是通过固态烧结制造的，由微立方体组成。将颗粒分散在未固化的PDMS中，并通过施加振荡的介电电泳取向场来取向。复合膜的介电常数几乎与微观结构无关，而在对齐时，压电电荷系数增加了十倍以上，最高达到17 pC N-1。定量分析表明，起源是对齐的双连续KNLN链中的颗粒间距离减少到1.0微米以下。温度稳定的压电电压系数的最大值为220 mV m N-1，体积分数仅为10％。该最新值优于具有随机分散颗粒的块状压电陶瓷和复合材料，并且与压电聚合物聚偏二氟乙烯及其与三氟乙烯的无规共聚物的报道值相当。优化的复合膜被并入柔性压电触摸传感器中。对高灵敏度进行了分析和讨论。由于制造技术简单易行，因此可以预见在诸如无线传感器网络和生物诊断学之类的柔性电子产品中的应用。

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