High-Sensitivity Flexible Piezoresistive Pressure Sensor Using PDMS/MWNTS Nanocomposite Membrane Reinforced with Isopropanol for Pulse Detection
<p>Schematic illustration of pulse detection based on pulse signal sensor.</p> "> Figure 2
<p>The preparation process of composite material mixed solution based on solution blending.</p> "> Figure 3
<p>Schematic illustration of composite membrane prepared by (<b>a</b>) the 3D mold method and (<b>b</b>) the spin coating method.</p> "> Figure 4
<p>The schematic diagram of composite membrane characterization.</p> "> Figure 5
<p>The conductive mechanism and sensing mechanism of pressure sensor.</p> "> Figure 6
<p>The pressure response of pressure sensors prepared with isopropanol, ethanol absolute, and nothing.</p> "> Figure 7
<p>The schematic diagram of the electrode structure of (<b>a</b>) the unilateral electrode model, (<b>b</b>) the opposite electrode model, and (<b>c</b>) the four-terminal method.</p> "> Figure 8
<p>The results of pressure response of sensors with different electrode structure.</p> "> Figure 9
<p>The pressure response of sensors with different MWNTS filler concentration.</p> "> Figure 10
<p>The pressure response of sensors with different composite membrane thicknesses.</p> "> Figure 11
<p>The optimal device in our work: (<b>a</b>) the real prototype of PDMS/MWNTS composite membrane; (<b>b</b>) the thickness measurement of the composite membrane; (<b>c</b>) the length measurement of the composite membrane; (<b>d</b>) the pressure response curve of the optimized flexible pressure sensor, where the dashed line is the linear fitting result, and the bar chart represents the coefficient of variation (CV) of the resistance measurement results at different pressures.</p> "> Figure 12
<p>The schematic diagram of resistive pressure sensor array.</p> "> Figure 13
<p>The schematic diagram of 5 × 5 resistance matrix scanning processing circuit. The blue rectangle and orange rectangle indicate five columns and five rows, respectively. A resistor exists between each row and column, and <math display="inline"><semantics> <mrow> <msub> <mi>R</mi> <mrow> <mn>33</mn> </mrow> </msub> </mrow> </semantics></math> indicates the resistance between the third row and the third column. Letters A and B indicate the two conductive paths for measuring the resistance of <math display="inline"><semantics> <mrow> <msub> <mi>R</mi> <mrow> <mn>33</mn> </mrow> </msub> </mrow> </semantics></math>, respectively.</p> ">
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation of PDMS/MWNTS Nanocomposites
2.3. Fabrication of Piezoresistive Pressure Sensors
2.4. Characterization
3. Results and Discussion
3.1. Sensor Design and Working Principle
3.2. The Characterization of Sensor Performance
3.2.1. The Impact of Organic Solvent
3.2.2. The Impact of Electrode Structure
3.2.3. The Impact of MWNTS Filler Concentration
3.2.4. The Impact of Composite Membrane Thickness
3.2.5. Quantitative Analysis for Optimal Conditions
3.3. The Prospect of Array Resistance Scanning Processing Circuit
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Long, Z.; Liu, X.; Xu, J.; Huang, Y.; Wang, Z. High-Sensitivity Flexible Piezoresistive Pressure Sensor Using PDMS/MWNTS Nanocomposite Membrane Reinforced with Isopropanol for Pulse Detection. Sensors 2022, 22, 4765. https://doi.org/10.3390/s22134765
Long Z, Liu X, Xu J, Huang Y, Wang Z. High-Sensitivity Flexible Piezoresistive Pressure Sensor Using PDMS/MWNTS Nanocomposite Membrane Reinforced with Isopropanol for Pulse Detection. Sensors. 2022; 22(13):4765. https://doi.org/10.3390/s22134765
Chicago/Turabian StyleLong, Zhiming, Xinggu Liu, Junjie Xu, Yubo Huang, and Zhuqing Wang. 2022. "High-Sensitivity Flexible Piezoresistive Pressure Sensor Using PDMS/MWNTS Nanocomposite Membrane Reinforced with Isopropanol for Pulse Detection" Sensors 22, no. 13: 4765. https://doi.org/10.3390/s22134765