Abstract
In the present study, an integrated flexible piezoresistive pressure sensor with a silicon rubber (SR) buffer layer is proposed to optimize the workable pressure range of flexible pressure sensor. The sensitive unit of the integrated flexible pressure sensor is made of composite elastic dielectric SR filled with carbon black (CB) and carbon nanotubes (CNTs). This paper introduces the preparation process, working principle and structure design of the CB/CNTs/SR composite with an SR buffer layer. In addition, the influence of electrode structure and buffer layer is studied. A dispersible interdigital electrode structure is selected to prevent the decline of pressure sensing sensitivity in a small range. The proposed flexible pressure sensor achieves a wide pressure range of 0–120 N. Facile fabrication, high repeatability, high stability and low cost are also excellent characteristics of the sensors investigated in this paper. In this study, a design proposal for wearable equipment and wearable bionic skin study is provided.
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