Soft Ionic Pressure Sensor with Aloe Vera Gel for Low-Pressure Applications

Abstract

Ionic pressure sensors are made of ionic compounds suspended in a suitable solvent mixture. When external pressure is exerted on them, it is reflected as a change in electrical parameters due to physical deformation and a redistribution of ions within the sensing medium. Variations in the composition and material of the sensing medium result in different pressure sensors with varying operating ranges and sensitivity. This work presents the design and fabrication procedure of a novel soft-pressure sensor for a very low-pressure range (<20 mm Hg) using Aloe vera gel and Glycerin as the solvent for the ionic sensing medium. We also provide a comparative study on the performance of sensor prototypes with varying solvent concentrations and geometric parameters based on a series of characterization experiments. Maximum sensitivity (7.498×10−4 Ω/mmHg) was observed when using 40% glycerin in the sensing medium, filled in a toroidal geometry with outer and inner channel diameters of 8 mm and 7 mm, respectively. The proposed sensor is entirely soft and can be designed to conform to any desired geometry.

Wearable, High-Sensitivity Piezoresistive Pressure Sensor Based on MWCNTs/NiMoO4@CMF for Real-Time Monitoring of Human Activities

“…31,32 However, the method needs to select the appropriate current collector to ensure that the current collector will not break under high temperature and high pressure and acid or alkaline erosion. 33 NiMoO 4 materials grown by the hydrothermal method are exactly in line with this situation. The hydrothermal synthesis of NiMoO 4 has a good nanoneedle structure, which meets the needs of high-performance sensors for the microstructure.…”

“…The hydrothermal method is an effective means to construct a microarray structure, by which different kinds of micromorphology can be constructed quickly. , However, the method needs to select the appropriate current collector to ensure that the current collector will not break under high temperature and high pressure and acid or alkaline erosion . NiMoO 4 materials grown by the hydrothermal method are exactly in line with this situation.…”