Highly Sensitive and Flexible Pressure Sensor Prepared by Simple Printing Used for Micro Motion Detection

Abstract

Smart wearable flexible sensors with high sensitivity and stability are still challenging nowadays when used for human motion detection, personal health monitoring, or artificial electronic skins. Here, a sensor assembled in a face‐to‐face manner based on fabric is proposed, firstly polyaniline (PANI)/nanonickel (Ni NPs)/COOH‐functionalized MWCNTs (COOH‐MWCNTs) conductive paste is prepared and printed on the cotton fabric. Then the printed fabric is assembled to be a flexible sensor which has double conductive layers. According to the analysis of the scanning electron microscopy, energy‐dispersive spectroscopy, X‐ray diffraction, and Fourier transform infrared spectroscopy, the synergistic performance of PANI, Ni NPs, and COOH‐MWCNTs is demonstrated. When the pressure is 0–0.1 kPa, gauge factor (GF) is 12.96 kPa−1, and when the pressure is 0.1–1 kPa, the GF is 1.33 kPa−1, indicating superior sensitivity of the sensor compared to traditional textile‐based sensors. It also displays quick response time of 0.2 s and recovery time of 0.3 s. The as‐prepared sensor can effectively monitor human micro motions like face, eye, and fingers movements, and it can also transmit electrical signals agilely by indirect contact. Moreover, a large‐area sensor spatial array is fabricated, and the test indicates the sensor can recognize spatial response.

High-performance piezoresistive flexible pressure sensor based on wrinkled microstructures prepared from discarded vinyl records and ultra-thin, transparent polyaniline films for human health monitoring

“…32 Currently, most PANI-based flexible devices are prepared by in situ polymerisation on flexible substrates. [33][34][35][36][37] The in situ synthesis of PANI is carried out in solution, the precise control of the experimental parameters (temperature, time, etc.) during the synthesis process is difficult.…”

Array Integration and Far‐Field Detection of Biocompatible Wireless LC Pressure Sensors

“…[ 4–6 ] There are three main sensing mechanisms for flexible pressure sensors, namely piezoelectricity, [ 7,8 ] capacitance, [ 9,10 ] and resistivity. [ 11 ] In recent years, many researches have reported on improving the performance of the sensor, such as high sensitivity, [ 12 ] wide detection range, [ 13 ] express response time, [ 14 ] and so on. However, these sensors require a wired terminal connection for data transmission, or wireless transmission of data through a Bluetooth module, [ 15,16 ] or complex integrated circuit (IC), [ 17,18 ] meaning extra complex circuit board and power supply.…”

Linearly Sensitive Pressure Sensor Based on a Porous Multistacked Composite Structure with Controlled Mechanical and Electrical Properties

“…These sensors can be utilized for diverse practical applications such as in electronic skin, , health monitoring, − and human–machine interfaces . The fabrication of different pressure sensors, such as piezoresistive, − capacitive, , piezoelectric, and triboelectric, − with various sensing mechanisms has been reported thus far. Capacitive sensors are flexible pressure sensors that transduce an applied pressure into a capacitance signal, and they are extensively utilized owing to their simple design, high stability, and low hysteresis .…”