PDMS/MWCNT-based tactile sensor array with coplanar electrodes for crosstalk suppression

Luxian, Wang; Peng, Huiling; Wang, Xiaolin; Chen, Xiang; Yang, Chunsheng; Yang, Bin; Liu, Jingquan

doi:10.1038/micronano.2016.65

Cited by 75 publications

(52 citation statements)

References 35 publications

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“…A variety of methods have been used to obtain improved piezoresistive sensitivity in lower pressure regimes. These include (1) microstructuring of the composite surface, such as carbon nanotubes-polydimethylsiloxane layers (CNT-PDMS) with pyramids or pillars and placing two such films in an interlocked configuration [ 15 , 16 ]; (2) embedding of CNT films on a PDMS diaphragm [ 17 , 18 ] or CNT fillers in a bilayer pillar PDMS structure [ 19 ]. The primary disadvantage of these methods is the increase in manufacturing complexity and cost.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite-Based Microstructured Piezoresistive Pressure Sensors for Low-Pressure Measurement Range

et al. 2018

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Piezoresistive pressure sensors capable of detecting ranges of low compressive stresses have been successfully fabricated and characterised. The 5.5 × 5 × 1.6 mm3 sensors consist of a planar aluminium top electrode and a microstructured bottom electrode containing a two-by-two array of truncated pyramids with a piezoresistive composite layer sandwiched in-between. The responses of two different piezocomposite materials, a Multiwalled Carbon Nanotube (MWCNT)-elastomer composite and a Quantum Tunneling Composite (QTC), have been characterised as a function of applied pressure and effective contact area. The MWCNT piezoresistive composite-based sensor was able to detect pressures as low as 200 kPa. The QTC-based sensor was capable of detecting pressures as low as 50 kPa depending on the contact area of the bottom electrode. Such sensors could find useful applications requiring the detection of small compressive loads such as those encountered in haptic sensing or robotics.

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Section: Introductionmentioning

confidence: 99%

Nanocomposite-Based Microstructured Piezoresistive Pressure Sensors for Low-Pressure Measurement Range

et al. 2018

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“…To obtain the piezoresistive sensitivity of these samples, the slopes of the curves in Supplementary Fig. S4a at a pressure lower than 5 kPa, which is the threshold point between the fast-response stage and the near-saturation stage 33 , are calculated according to equation ( 1 ) and the results are displayed in Supplementary Fig. S4b 27 .…”

Section: Resultsmentioning

confidence: 99%

Cross-Talk Immunity of PEDOT:PSS Pressure Sensing Arrays with Gold Nanoparticle Incorporation

Karmakar

et al. 2017

Sci Rep

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In this study, the cross-talk effects and the basic piezoresistive characteristics of gold nanoparticle (Au-NP) incorporated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) pressure sensing 2 × 2 arrays are investigated using a cross-point electrode (CPE) structure. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) mappings were carried out to confirm the incorporation of Au-NPs in the PEDOT:PSS films. A solution mixing process was employed to incorporate the nanoparticles. When the diameter of the Au-NPs incorporated in the PEDOT:PSS films (Au-NPs/PEDOT:PSS) was 20 nm, the piezoresistive pressure sensing 2 × 2 arrays were almost immune to cross-talk effects, which enhances the pressure sensing accuracy of the array. The Au-NPs render the PEDOT:PSS films more resilient. This is confirmed by the high plastic resistance values using a nanoindenter, which reduce the interference between the active and passive cells. When the size of the Au-NPs is more than 20 nm, a significant cross-talk effect is observed in the pressure sensing arrays as a result of the high conductivity of the Au-NPs/PEDOT:PSS films with large Au-NPs. With the incorporation of optimally sized Au-NPs, the PEDOT:PSS piezoresistive pressure sensing arrays can be promising candidates for future high-resolution fingerprint identification system with multiple-electrode array structures.

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“…A few approaches have been developed for tactile CNT actuators with different mechanisms. By adapting the high mechanical strength and high conductivity of MWCNT, Wang et al [51] have developed a PDMS/MWCNT coplanar electrode layer to overcome crosstalk effects in the tactile array ( Figure 2). Other approaches, such as activating CNT composites via different, have also shown promising results for tactile applications.…”

Section: Carbon Nanotubementioning

confidence: 99%

“…Assembly of PDMS/MWCNT-based tactile sensor array with coplanar electrodes. Adapted from[51]. Schematic concept of carbon nanotube (CNT) composite film driven by the light source to form "blister" shape and flat shape for actuation.…”

mentioning

confidence: 99%

A Review of Smart Materials in Tactile Actuators for Information Delivery

Xie

Liu

Yang

et al. 2017

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As the largest organ in the human body, the skin provides the important sensory channel for humans to receive external stimulations based on touch. By the information perceived through touch, people can feel and guess the properties of objects, like weight, temperature, textures, and motion, etc. In fact, those properties are nerve stimuli to our brain received by different kinds of receptors in the skin. Mechanical, electrical, and thermal stimuli can stimulate these receptors and cause different information to be conveyed through the nerves. Technologies for actuators to provide mechanical, electrical or thermal stimuli have been developed. These include static or vibrational actuation, electrostatic stimulation, focused ultrasound, and more. Smart materials, such as piezoelectric materials, carbon nanotubes, and shape memory alloys, play important roles in providing actuation for tactile sensation. This paper aims to review the background biological knowledge of human tactile sensing, to give an understanding of how we sense and interact with the world through the sense of touch, as well as the conventional and state-of-the-art technologies of tactile actuators for tactile feedback delivery.

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PDMS/MWCNT-based tactile sensor array with coplanar electrodes for crosstalk suppression

Cited by 75 publications

References 35 publications

Nanocomposite-Based Microstructured Piezoresistive Pressure Sensors for Low-Pressure Measurement Range

Nanocomposite-Based Microstructured Piezoresistive Pressure Sensors for Low-Pressure Measurement Range

Cross-Talk Immunity of PEDOT:PSS Pressure Sensing Arrays with Gold Nanoparticle Incorporation

A Review of Smart Materials in Tactile Actuators for Information Delivery

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