A highly flexible, stretchable and ultra-thin piezoresistive tactile sensor array using PAM/PEDOT:PSS hydrogel

Hoang, Phi Tien; Phung, Hoa; Nguyen, Canh Toan; Nguyen, Tien Dat; Choi, Hyouk Ryeol

doi:10.1109/urai.2017.7992873

Cited by 25 publications

(26 citation statements)

References 8 publications

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“…The change in the output of the sensors with respect to the applied pressure on the sensing surface was determined in terms of the change in relative resistance, as shown in the equivalent circuit in Figure 5. The responses were monitored using a HIOKI IM 3536 LCR metre that was [42]. The resistive values of this element vary according to the magnitude and direction of the pressure applied to the sensors.…”

Section: Resultsmentioning

confidence: 99%

“…The working principle of the resistive sensors. The sensor consists of a variable resistor, which is the piezoresistive sensing element [42]. The resistive values of this element vary according to the magnitude and direction of the pressure applied to the sensors.…”

Section: Resultsmentioning

confidence: 99%

“…Fifty samples had been used for each of the experiments to validate the repeatability in the responses of these fabricated sensors. Figure 5 shows the schematic diagram of the equivalent circuit of the sensors depicting the conditions before and after the application of pressure [42]. Along with the internal electrode resistive elements, the sensor also consists of a piezoresistive element that exists between the electrodes.…”

Section: Sensors Used For Experimentationmentioning

confidence: 99%

“…Fifty samples had been used for each of the experiments to validate the repeatability in the responses of these fabricated sensors. [42]. The resistive values of this element vary according to the magnitude and direction of the pressure applied to the sensors.…”

Section: Sensors Used For Experimentationmentioning

confidence: 99%

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Gold/Polyimide-Based Resistive Strain Sensors

et al. 2019

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This paper presents the fabrication and implementation of novel resistive sensors that were implemented for strain-sensing applications. Some of the critical factors for the development of resistive sensors are addressed in this paper, such as the cost of fabrication, the steps of the fabrication process which make it time-consuming to complete each prototype, and the inability to achieve optimised electrical and mechanical characteristics. The sensors were fabricated via magnetron sputtering of thin-film chromium and gold layer on the thin-film substrates at defined thicknesses. Sticky copper tapes were attached on the two sides of the sensor patches to form the electrodes. The operating principle of the fabricated sensors was based on the change in their responses with respect to the corresponding changes in their relative resistance as a function of the applied strain. The strain-induced characteristics of the patches were studied with different kinds of experiments, such as consecutive bending and pressure application. The sensors with 400 nm thickness of gold layer obtained a sensitivity of 0.0086 Ω/ppm for the pressure ranging between 0 and 400 kPa. The gauge factor of these sensors was between 4.9–6.6 for temperatures ranging between 25 °C and 55 °C. They were also used for tactile sensing to determine their potential as thin-film sensors for industrial applications, like in robotic and pressure-mapping applications. The results were promising in regards to the sensors’ controllable film thickness, easy operation, purity of the films and mechanically sound nature. These sensors can provide a podium to enhance the usage of resistive sensors on a higher scale to develop thin-film sensors for industrial applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Sensors Used For Experimentationmentioning

confidence: 99%

Section: Sensors Used For Experimentationmentioning

confidence: 99%

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Gold/Polyimide-Based Resistive Strain Sensors

et al. 2019

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“…To enable distributed pressure sensing, array structures have been developed [432][433][434][435]. A piezoresistive tactile sensor array of 12 × 8 sensors was produced on a stacked PDMS substrate [434]. Each individual cell was made of piezoresistive polyacrylamide (PAM):PEDOT/PSS gel, interconnected with conductive silicone and toluene to form an electrode network on both layers.…”

Section: Resistive Pressure Sensorsmentioning

confidence: 99%

Flexible Sensors—From Materials to Applications

et al. 2019

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Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.

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Using a conductive sphere as a probe to characterize the sensitivity of soft piezoresistive films

Green

Rogers

Kovenburg

et al. 2020

J of Applied Polymer Sci

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Flexible piezoresistive films, such as, carbon black/polydimethylsiloxane (C‐PDMS) composites, are often used as skin analogs and integrated into complex array sensors for tactile sensing. The uniformity of the sensor characteristics heavily depends on the homogeneity of the composite. Therefore, the ability to locally characterize a film that will be integrated into a complex force sensor could be critical. Here, a method to characterize the local sensitivity of flexible piezoresistive films is presented. Using a conductive sphere, which was chosen over a flat probe to eliminate misalignment issues, the surface of a thin film composite is indented to characterize the change in resistivity in terms of average strain. Experiments were performed with 15 and 18 wt% carbon black C‐PDMS films of varying thickness. The contact radius of the probe with the piezoresistive film was estimated using the Johnson‐Roberts‐Kendall contact theory. Theoretical contact area estimates were found to agree with contact radius measurements carried out using optically transparent PDMS films observed through an optical microscope. Results show that C‐PDMS with 15 wt% carbon black exhibit a higher rate if change of resistivity and gauge factor than films of same thickness with 18 wt% carbon black. On the other hand, thicker films exhibit higher gauge factors for the two tested carbon black contents. Tests carried out at multiple locations yielded consistent sensitivity values, making these types of composites suitable for array type force sensors.

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A highly flexible, stretchable and ultra-thin piezoresistive tactile sensor array using PAM/PEDOT:PSS hydrogel

Cited by 25 publications

References 8 publications

Gold/Polyimide-Based Resistive Strain Sensors

Gold/Polyimide-Based Resistive Strain Sensors

Flexible Sensors—From Materials to Applications

Using a conductive sphere as a probe to characterize the sensitivity of soft piezoresistive films

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