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Binary Spiky/Spherical Nanoparticle Films with Hierarchical Micro/Nanostructures for High-Performance Flexible Pressure Sensors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-21 , DOI: 10.1021/acsami.0c18543 Young-Ryul Kim 1 , Minsoo P. Kim 1 , Jonghwa Park 1 , Youngoh Lee 1 , Sujoy Kumar Ghosh 1 , Jinyoung Kim 1 , Donghee Kang 1 , Hyunhyub Ko 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-21 , DOI: 10.1021/acsami.0c18543 Young-Ryul Kim 1 , Minsoo P. Kim 1 , Jonghwa Park 1 , Youngoh Lee 1 , Sujoy Kumar Ghosh 1 , Jinyoung Kim 1 , Donghee Kang 1 , Hyunhyub Ko 1
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Flexible pressure sensors have been widely explored for their versatile applications in electronic skins, wearable healthcare monitoring devices, and robotics. However, fabrication of sensors with characteristics such as high sensitivity, linearity, and simple fabrication process remains a challenge. Therefore, we propose herein a highly flexible and sensitive pressure sensor based on a conductive binary spiky/spherical nanoparticle film that can be fabricated by a simple spray-coating method. The sea-urchin-shaped spiky nanoparticles are based on the core–shell structures of spherical silica nanoparticles decorated with conductive polyaniline spiky shells. The simple spray coating of binary spiky/spherical nanoparticles enables the formation of uniform conductive nanoparticle-based films with hierarchical nano/microstructures. The two differently shaped particles-based films (namely sea-urchin-shaped and spherical) when interlocked face-to-face to form a bilayer structure can be used as a highly sensitive piezoresistive pressure sensor. Our optimized pressure sensor exhibits high sensitivity (17.5 kPa–1) and linear responsivity over a wide pressure range (0.008–120 kPa), owing to the effects of stress concentration and gradual deformation of the hierarchical microporous structures with sharp nanoscale tips. Moreover, the sensor exhibits high durability over 6000 repeated cycles and practical applicability in wearable devices that can be used for healthcare monitoring and subtle airflow detection (1 L/min).
中文翻译：
具有高性能/柔性纳米结构的二元尖峰/球形纳米颗粒膜
柔性压力传感器已广泛应用于电子皮肤，可穿戴式医疗监控设备和机器人技术中。然而，具有诸如高灵敏度，线性和简单的制造过程的特征的传感器的制造仍然是挑战。因此，我们在此提出一种基于导电二元尖峰/球形纳米颗粒薄膜的高度柔性和灵敏的压力传感器，该传感器可以通过简单的喷涂方法制造。海胆形状的尖刺纳米颗粒基于球形二氧化硅纳米颗粒的核-壳结构，并装饰有导电聚苯胺尖刺壳。简单的二元尖峰/球形纳米颗粒喷涂层可以形成具有分层纳米/微观结构的均匀导电纳米颗粒基薄膜。当面对面互锁以形成双层结构时，两种不同形状的基于颗粒的膜（即海胆形和球形）可以用作高灵敏度的压阻式压力传感器。我们优化的压力传感器具有高灵敏度（17.5 kPa–1）和宽压力范围（0.008–120 kPa）内的线性响应性，这是由于应力集中和具有尖锐的纳米级尖端的分层微孔结构的逐渐变形所致。此外，该传感器在6000次重复循环中显示出极高的耐用性，并且在可穿戴设备中具有实用性，可用于医疗保健监测和微妙的气流检测（1 L / min）。
更新日期：2020-12-30
中文翻译：
具有高性能/柔性纳米结构的二元尖峰/球形纳米颗粒膜
柔性压力传感器已广泛应用于电子皮肤，可穿戴式医疗监控设备和机器人技术中。然而，具有诸如高灵敏度，线性和简单的制造过程的特征的传感器的制造仍然是挑战。因此，我们在此提出一种基于导电二元尖峰/球形纳米颗粒薄膜的高度柔性和灵敏的压力传感器，该传感器可以通过简单的喷涂方法制造。海胆形状的尖刺纳米颗粒基于球形二氧化硅纳米颗粒的核-壳结构，并装饰有导电聚苯胺尖刺壳。简单的二元尖峰/球形纳米颗粒喷涂层可以形成具有分层纳米/微观结构的均匀导电纳米颗粒基薄膜。当面对面互锁以形成双层结构时，两种不同形状的基于颗粒的膜（即海胆形和球形）可以用作高灵敏度的压阻式压力传感器。我们优化的压力传感器具有高灵敏度（17.5 kPa–1）和宽压力范围（0.008–120 kPa）内的线性响应性，这是由于应力集中和具有尖锐的纳米级尖端的分层微孔结构的逐渐变形所致。此外，该传感器在6000次重复循环中显示出极高的耐用性，并且在可穿戴设备中具有实用性，可用于医疗保健监测和微妙的气流检测（1 L / min）。
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