Abstract
A piezoelectric sensor is a typical self-powered sensor. With the advantages of a high sensitivity, high frequency band, high signal-to-noise ratio, simple structure, light weight, and reliable operation, it has gradually been applied to the field of smart wearable devices. Here, we first report a flexible piezoelectric sensor (FPS) based on tungsten disulfide (WS2) monolayers that generate electricity when subjected to human movement. The generator maximum voltage was 2.26 V, and the produced energy was 55.45 μJ of the electrical charge on the capacitor (capacity: 220 μF) when applying periodic pressing by 13 kg. The generator demonstrated here can meet the requirements of human motion energy because it generates an average voltage of 7.74 V (a knee), 8.7 V (a sole), and 4.58 V (an elbow) when used on a running human (weight: 75 kg). Output voltages embody distinct patterns for different human parts, the movement-recognition capability of the cellphone application. This generator is quite promising for smart sensors in human–machine interaction detecting personal movement.
Highlights
Flexible wearable electronic devices have been widely studied due to their excellent sensitivity, ductility, durability, and compatibility with human skin
The power generation characteristics of the flexible WS2 piezoelectric generator (FWPG) under different weights were measured with this equipment, and the devices measured the average voltage generated at the knee, on the sole of the foot, and at the elbow under the condition of human movement
The monolayer WS2 was used in the flexible piezoelectric sensor (FPS) as an active piezoelectric material
Summary
Flexible wearable electronic devices have been widely studied due to their excellent sensitivity, ductility, durability, and compatibility with human skin. As a self-powered sensing system, a piezoelectric sensor has great application potential in the field of wearable sensing. The piezoelectric energy harvesting of TMDC materials is becoming greater in order to effectively power various nanosystems [14,15]. Kim et al reported an MoS2 nanogenerator with a generated voltage and output performance of 20 mV and 30 pA, respectively, as well as a bending strain of 0.48% at a frequency of 0.5 Hz [16]. Han et al reported an S-treated monolayer MoS2 nanosheet with the output peak current and voltage of 100 pA and 22 mV, respectively [17]. J.H. et al reported a monolayer WSe2 piezoelectric nanogenerator that generated a peak output voltage of 45 mV under a strain of 0.39%. The Results and Discussion sections describe the measurement process and the results of the whole system
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