Abstract
Herein, we demonstrate the prototype of a combined flexible pressure sensor based on ultrathin multiwall carbon nanotubes (MWCNTs) and graphite nanobelts (GNBs) films embedded in polydimethylsiloxane (PDMS). A simple and scalable modified Langmuir–Blodgett method was used for deposition of both MWCNT and GNB films. The use of two types of carbon nanostructures (nanotubes and GNBs) with distinctly different mechanical properties allowed obtaining enhanced dynamic range for pressure sensing. Short response time, good sensibility and flexibility, and low power consumption for enhanced pressure range make possible applications of the sensor for healthcare monitoring and as a component in the human–machine interfaces application.
Highlights
Novel flexible and wearable electronic devices have attracted much interest in the last decade, with numerous applications that span from simple recreational exercise monitoring to rare heart disease diagnostics, human sensory capabilities, and soft robotics (Kim et al, 2011)
CNTs in different arrangements are widely used in pressure sensor fabrication (Figure 1), with the choice of the sensor configuration depending on the specific application
We present the prototype of a thin, flexible, and wearable piezoresistive pressure sensor composed of two sensitive elements—multiwall carbon nanotubes (MWCNTs) and graphite nanobelts (GNBs) films embedded in PDMS layers—which can be integrated into one device with low power consumption and enhanced dynamic range
Summary
Novel flexible and wearable electronic devices have attracted much interest in the last decade, with numerous applications that span from simple recreational exercise monitoring to rare heart disease diagnostics, human sensory capabilities, and soft robotics (Kim et al, 2011). Chemical and thermal stability, easy manipulation, and transfer onto different types of substrates make carbon nanostructure (CNS) materials (such as multilayer graphene or nanographite flakes and carbon nanotubes (CNTs)) highly suitable for flexible electronics (Obiedkov et al, 2012; Alaferdov et al, 2014; Wang et al, 2019; Zheng et al, 2020) Sensors based on these materials as building blocks showed high sensitivity and reproducibility for strain, pressure, and physiological signals monitoring (Sun et al, 2015; Wang et al, 2019). It motivated us to create a pressure sensor with a wide dynamic range using simple and low-cost techniques of fabrication, which demonstrates short enough recovery/response time and sensitive to detect several types of signals
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