Structure-Driven,\nFlexible, Multilayered, Paper-Based\nPressure Sensor for Human–Machine Interfacing

Abstract

Flexible pressure sensors have gained considerable attention\nfor\ntheir potential applications in wearable electronics and human–machine\ninterfacing. However, two major bottlenecks in their widespread usage (i)\nachieving high sensitivity over a wide working pressure range and\n(ii) constituent material platform for manufacturability and environmental\nsafety still limits its utility. Herein, we suggest a low-cost hierarchical\nconstruction strategy, which enhances the sensitivity of a paper-based\npiezoresistive pressure sensor over a wide working range. This strategy\nuses a special multilayered cellulose paper structure composed of\nalternate layers of plain and corrugated paper sheets, coated with\n2D tin-monosulfide (SnS). This design of the paper pressure sensor\nallows it to achieve high sensitivity up to 14.8 kPa–1 and\na broad working range of 0–120 kPa with good durability and\nrepeatability. Further, to confirm practical applicability, we\nutilized an array of these multilayered flexible pressure sensors\nfor monitoring human activity and developing a biodegradable\nand foldable keypad. The proposed paper-based green electronic platform\ncan potentially be used in a variety of applications including healthcare\nand human–machine interfacing.