A bioinspired three-dimensional integrated e-skin for multiple mechanical stimuli recognition. (February 2022)

• Record Type: Journal Article
• Authors: Zeng, Xiangwen; Liu, Youdi; Liu, Fengming; Wang, Wanyi; Liu, Xiyu; Wei, Xiaoding; Hu, Youfan
• Is Part Of: Nano energy. Volume 92(2022)
• Publication Date: 2022-02
• Subjects: 3D e-skin -- Recognition of multiple stimuli -- Bioinspired integrated sensor system; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.106777
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Spatiotemporal recognition of multiple mechanical stimuli is essential for electronic skin (e-skin), which can provide more complete and accurate interaction information to enable elaborated functions, such as gesture recognition, object manipulation, and fine tactile discrimination. However, nonspecific sensor response and performance sacrifice for integration limit the perceptual capability of the current systems. Here, we report a bioinspired e-skin that can measure strain, shear and pressure independently with direction information using three-dimensional integrated, mechanically isolated multiple sensors. Novel microstructures of collapsed nanocone clusters, hemi-ellipsoids, and wrinkles are introduced in different sensors to achieve a gauge factor of 6 with a linear working range of 80% (linearity > 0.99) for strain, a sensitivity of 0.1 N −1 for shear force, and a sensitivity of 3.78 kPa −1 for pressure, and all of these sensors possess short response times on the order of 100 ms. The independent, highly sensitive, and fast response of these sensors makes real-time recording and mapping of multiple mechanical stimuli to be achieved. Multi-touch gesture recognition and perception of a red bean (0.065 g) in the hand are demonstrated to illustrate the potential applications in wearables, robotics and bionic prostheses. Graphical Abstract: A bioinspired e-skin that discriminates strain, shear and pressure is developed through a three-dimensional mechanical design cooperated with sophisticated microstructures. Isolated responses of different sensors that possessing excellent performance enabled spatiotemporal recognition of multiple mechanical stimuli toward advanced wearable clinical/biological technologies. ga1 Highlights: Collapsed nanocone clusters are newly developed to maintain high electrical conductivity of the coated metal film even stretched up to 95% strain. Simultaneously -identifying strain, shear and pressure with direction information was realized for the first time. Spatiotemporal recognition of multiple mechanical stimuli was demonstrated.