Intentional Blocking Based Photoelectric Soft Pressure Sensor with High Sensitivity and Stability

Sugar-plastic assisted fabrication of hollow PDMS wearable fabrics toward excellent sensory capabilities

“…Like a porous polymer, fiber or fabric-based sensors with their deformable dimensions would greatly improve their sensing performance based on piezoresistive mechanisms. 30–32 Additionally, microstructures such as pyramids, 33–36 hemispheres, 37–40 etc. , constructed on a flexible sensing substrate surface have been reported to contribute to their sensitivity.…”

“…Like a porous polymer, ber or fabric-based sensors with their deformable dimensions would greatly improve their sensing performance based on piezoresistive mechanisms. [30][31][32] Additionally, microstructures such as pyramids, [33][34][35][36] hemispheres, 37-40 etc., constructed on a exible sensing substrate surface have been reported to contribute to their sensitivity. Unlike hydrogels with so microstructures, stiff microstructures with a higher modulus than the matrix can not only maintain a stable form under pressure but also enable rapid and immediate transmission of sensing information to the matrix, resulting in a rapid response.…”

Flexible Pressure Sensors in Human–Machine Interface Applications

“…The resistivity is usually determined by the material of resistance, and it is also affected by the temperature. From the perspective of the resistance definition equation, the resistance of a sensor is dependent on Off-electronic ITO/PEDOT:PSS 5 nF kPa −1 (0−5 kPa) 0.15 nF kPa −1 (10−30 kPa) / Submillisecond >10 000 [50] Field-effect transistor TFT 18.96 kPa −1 (<1 kPa) 2.07 kPa −1 (5−40 kPa) / / / [ 51] Photoelectric effect Light-emitting diode 48.07 kPa −1 (0−120 kPa) 0.8 Pa / 12 130 [52] the conductive material of the sensor, its length, and its effective contact area. Its magnitude exhibits an inverse correlation with the material's cross-sectional area A while demonstrating a direct proportionality to both the resistivity and the length L. For instance, Chen [38] et al prepared an enhanced wavy microfluidic flexible piezoresistive sensor by extending the length of the microfluidic channel; He [39] et al prepared a flexible pressure sensor and showed that the increase in the contact area of its conductive material PDMS/Gr with the electrodes helps to improve the sensitivity across a broad pressure range, as shown in Figure 3a,b.…”

“…The amount of pressure applied to the sensor can be inferred by measuring the change of current. Li [ 52 ] et al. prepared an optoelectronic pressure sensor based on intentional blocking.…”

“…View A and view B are the correct views of the schematic. Reproduced (Adapted) with permission [52]. Copyright 2021, Mary Ann Liebert Inc.…”