Abstract
Sensitivity and pressure range are two significant parameters of pressure sensors. Existing pressure sensors have difficulty achieving both high sensitivity and a wide pressure range. Therefore, we propose a new pressure sensor with a ternary nanocomposite Fe2O3/C@SnO2. The sea urchin-like Fe2O3 structure promotes signal transduction and protects Fe2O3 needles from mechanical breaking, while the acetylene carbon black improves the conductivity of Fe2O3. Moreover, one part of the SnO2 nanoparticles adheres to the surfaces of Fe2O3 needles and forms Fe2O3/SnO2 heterostructures, while its other part disperses into the carbon layer to form SnO2@C structure. Collectively, the synergistic effects of the three structures (Fe2O3/C, Fe2O3/SnO2 and SnO2@C) improves on the limited pressure response range of a single structure. The experimental results demonstrate that the Fe2O3/C@SnO2 pressure sensor exhibits high sensitivity (680 kPa−1), fast response (10 ms), broad range (up to 150 kPa), and good reproducibility (over 3500 cycles under a pressure of 110 kPa), implying that the new pressure sensor has wide application prospects especially in wearable electronic devices and health monitoring.
Highlights
Sensitivity and pressure range are two significant parameters of pressure sensors
Yin et al reported that ZnO sea-urchin-shaped microparticles with a low-temperature solution process exhibited a high sensitivity of 121 kPa−123
Lee et al achieved a sensitivity of 2.46 kPa−1 with a piezoresistive pressure sensor based on sea-urchin-shaped metal nanoparticles[24]
Summary
Sensitivity and pressure range are two significant parameters of pressure sensors. Existing pressure sensors have difficulty achieving both high sensitivity and a wide pressure range. The Fe2O3/C@SnO2 (3:1:4) pressure sensor exhibited a high sensitivity (680 kPa−1), fast response (10 ms), broad range (up to 150 kPa) and good reproducibility (over 3500 cycles under a pressure of 110 kPa). 1 shows the current response of the pressure sensors under different mass ratios of Fe2O3 and carbon.
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