Journal
SMALL
Volume 14, Issue 27, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201800819
Keywords
graphene; hierarchical structure; linearity range; piezoresistive; pressure sensors
Categories
Funding
- National Natural Science Foundation of China [21673057]
- International Co-operation Program of the Chinese Academy of Sciences [121D11KYSB20150022]
- Beijing Municipal Science and Technology Commission [Z161100002116010]
- National Key R&D Program of China [2017YFF0209900, 2017YFF0209901]
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Flexible piezoresistive pressure sensors have been attracting wide attention for applications in health monitoring and human-machine interfaces because of their simple device structure and easy-readout signals. For practical applications, flexible pressure sensors with both high sensitivity and wide linearity range are highly desirable. Herein, a simple and low-cost method for the fabrication of a flexible piezoresistive pressure sensor with a hierarchical structure over large areas is presented. The piezoresistive pressure sensor consists of arrays of microscale papillae with nanoscale roughness produced by replicating the lotus leaf's surface and spray-coating of graphene ink. Finite element analysis (FEA) shows that the hierarchical structure governs the deformation behavior and pressure distribution at the contact interface, leading to a quick and steady increase in contact area with loads. As a result, the piezoresistive pressure sensor demonstrates a high sensitivity of 1.2 kPa(-1) and a wide linearity range from 0 to 25 kPa. The flexible pressure sensor is applied for sensitive monitoring of small vibrations, including wrist pulse and acoustic waves. Moreover, a piezoresistive pressure sensor array is fabricated for mapping the spatial distribution of pressure. These results highlight the potential applications of the flexible piezoresistive pressure sensor for health monitoring and electronic skin.
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