With the rapid development of wearable devices, flexible pressure sensors with high sensitivity and wide workable range are highly desired. In nature, there are many well-adapted structures developed through natural s...With the rapid development of wearable devices, flexible pressure sensors with high sensitivity and wide workable range are highly desired. In nature, there are many well-adapted structures developed through natural selection, which inspired us for the design of biomimetic materials or devices. Particularl3 human fingertip skin, where many epidermal ridges amplify external stimulations, might be a good example to imitate for highly sensitive sensors. In this work, based on unique chemical vapor depositions （CVD）-grown three-dimensional （3D） graphene films that mimic the morphology of fingertip skin, we fabricated flexible pressure sensing membranes, which simultaneously showed a high sensitivity of 110 （kPa）-1 for 0-0.2 kPa and wide workable pressure range （up to 75 kPa）. Hierarchical structured polydimethylsiloxane （PDMS） films molded from natural leaves were used as the supporting elastic films for the graphene films, which also contribute to the superior performance of the pressure sensors. The pressure sensor showed a low detection limit （0.2 Pa）, fast response （〈 30 ms）, and excellent stability for more than 10,000 loading/unloading cycles. Based on these features, we demonstrated its applications in detecting tiny objects, sound, and human physiological signals, showing its potential in wearable electronics for health monitoring and human/machine interfaces.展开更多
针对固体火箭发动机柔性接头组件室温粘接、加压固化成型工艺过程中存在的加压压力分布参数难以在线监测等问题,建立了采用薄膜压力传感器阵列的柔性接头成型压力测试系统,用于监测成型过程中柔性接头组件所受压力的大小和分布。研究了...针对固体火箭发动机柔性接头组件室温粘接、加压固化成型工艺过程中存在的加压压力分布参数难以在线监测等问题,建立了采用薄膜压力传感器阵列的柔性接头成型压力测试系统,用于监测成型过程中柔性接头组件所受压力的大小和分布。研究了压力测试系统在柔性接头成型工艺条件下的在线监测适用性,分析了柔性接头组件受压变化及结构误差的影响。结果表明,该研究建立的压力测试系统具有1%左右的测试线性度和10 k Hz以上的动态响应特性,能够有效测试1.5 MPa以下曲面压力场,最大压差为0.03 MPa,所测压力分布反映了成型过程中的变化,满足接头成型工艺测试要求。测试结果对于理解柔性接头成型工艺过程中的粘接剂流动等,为通过进一步优化工艺参数和减少结构误差、实现对柔性接头成型质量的有效控制有所帮助。展开更多
文摘With the rapid development of wearable devices, flexible pressure sensors with high sensitivity and wide workable range are highly desired. In nature, there are many well-adapted structures developed through natural selection, which inspired us for the design of biomimetic materials or devices. Particularl3 human fingertip skin, where many epidermal ridges amplify external stimulations, might be a good example to imitate for highly sensitive sensors. In this work, based on unique chemical vapor depositions （CVD）-grown three-dimensional （3D） graphene films that mimic the morphology of fingertip skin, we fabricated flexible pressure sensing membranes, which simultaneously showed a high sensitivity of 110 （kPa）-1 for 0-0.2 kPa and wide workable pressure range （up to 75 kPa）. Hierarchical structured polydimethylsiloxane （PDMS） films molded from natural leaves were used as the supporting elastic films for the graphene films, which also contribute to the superior performance of the pressure sensors. The pressure sensor showed a low detection limit （0.2 Pa）, fast response （〈 30 ms）, and excellent stability for more than 10,000 loading/unloading cycles. Based on these features, we demonstrated its applications in detecting tiny objects, sound, and human physiological signals, showing its potential in wearable electronics for health monitoring and human/machine interfaces.
文摘针对固体火箭发动机柔性接头组件室温粘接、加压固化成型工艺过程中存在的加压压力分布参数难以在线监测等问题,建立了采用薄膜压力传感器阵列的柔性接头成型压力测试系统,用于监测成型过程中柔性接头组件所受压力的大小和分布。研究了压力测试系统在柔性接头成型工艺条件下的在线监测适用性,分析了柔性接头组件受压变化及结构误差的影响。结果表明,该研究建立的压力测试系统具有1%左右的测试线性度和10 k Hz以上的动态响应特性,能够有效测试1.5 MPa以下曲面压力场,最大压差为0.03 MPa,所测压力分布反映了成型过程中的变化,满足接头成型工艺测试要求。测试结果对于理解柔性接头成型工艺过程中的粘接剂流动等,为通过进一步优化工艺参数和减少结构误差、实现对柔性接头成型质量的有效控制有所帮助。
