Multifunctional Electronic Skin With a Stack of Temperature and Pressure Sensor Arrays

Kumaresan, Yogeenth; Ozioko, Oliver; Dahiya, Ravinder

doi:10.1109/jsen.2021.3055458

Cited by 68 publications

(38 citation statements)

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“…In some cases, a composite dielectric incorporating filler material such as carbon nanotubes, silver nanowires (NW) etc. in the elastomeric matrix have also been explored [12,[21][22][23][24][25]. For example, microarrayed PDMS structure based capacitive pressure sensors show better sensitivity (0.6-2 kPa -1 ) compared to the flat PDMS (0.01-0.016 kPa -1 ) in the low-pressure region (0-2 kPa) [26,27].…”

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confidence: 99%

Soft Capacitive Pressure Sensor With Enhanced Sensitivity Assisted by ZnO NW Interlayers and Airgap

Kumaresan

Ozioko

et al. 2022

IEEE Sensors J.

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Highly sensitive capacitive pressure sensors with wide detection range are needed for applications such as humanmachine interfaces, electronic skin in robotics, and health monitoring. However, it is challenging to achieve high sensitivity and wide detection range at the same time. Herein, we present an innovative approach to obtain a highly sensitive capacitive pressure sensor by introducing a zinc oxide nanowire (ZnO NW) interlayer at the polydimethylsiloxane (PDMS)/electrodes interface in the conventional metal-insulator-metal architecture. The ZnO NW interlayer significantly enhanced the performance with ~7 times higher sensitivity (from 0.81 %kPa -1 to 5.6452 %kPa -1 at a low-pressure range (0-10 kPa)) with respect to conventional capacitive sensors having PDMS only as the dielectric. The improvement in sensitivity is attributed to the enhanced charge separation and electric dipole generation due to the displacement of Zn + and Ounder applied pressure. Further, the orientation of ZnO NWs and their placement between the electrodes were investigated which includes either vertical or horizontal NWs near the electrodes, placing a third ZnO NW interlayer in the middle of dielectric PDMS and introducing an air gap between the ZnO NWs/electrode. Among various combinations, the introduction of air gap between the electrode and ZnO NW interlayer revealed a significant improvement in the device performance with ~50 times enhancement at a low-pressure range (0-10 kPa) and more than 200 times increase at a high-pressure range (10-200 kPa), in comparison with the conventional PDMS-based pressure sensor.

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Soft Capacitive Pressure Sensor With Enhanced Sensitivity Assisted by ZnO NW Interlayers and Airgap

Kumaresan

Ozioko

et al. 2022

IEEE Sensors J.

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“…In addition, the force range and the pressure range that the FIFO sensor can be detected are from 0 to 20 N and from 0 to 103 kPa, respectively. Although the force sensitivity of the FIFO sensor in current design is modest and is not as good as advanced electronic tactile sensors reported recently, [38][39][40][41] its broad force range together with its excellent slip detection sensitivity (which will be discussed later) can still satisfy the needs for robotic grasping, considering that the applied force is commonly below 10 N in dexterous robotic manipulation. [42,43] The cycling durability of the sensor was examined by repeatedly applying and releasing a normal force at frequency of 0.5 Hz for more than 1000 cycles.…”

Section: Resultsmentioning

confidence: 99%

Finger‐Skin‐Inspired Flexible Optical Sensor for Force Sensing and Slip Detection in Robotic Grasping

Jiang

Zhang

Pan

et al. 2021

Adv Materials Technologies

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by nanoengineering and flexible electronics, [4][5][6][7][8] accurate detection of physical stimuli such as pressure, temperature, and humidity has been realized in flexible tactile sensors, rendering them both high sensitivity and excellent flexibility comparable to human skin (hence the name "artificial skin"). [4,9] To allow for applications in robotics, slip detection during the grasping and manipulation of objects is a critical function that should be included in the flexible tactile sensor when used in robotic hand or manipulator. [10][11][12] Widerange force sensing and fast-response slip detection are needed in robotic grasping and dexterous manipulation for the purpose of measuring the contact force and preventing object slippage. For example, home robots and nursing robots would be expected to safely deliver objects and operate instruments, while manufacturing robots and industrial robots would be assigned to perform manipulation and assembly tasks in high precision. [11,13] However, the development of flexible tactile sensor with simultaneous force sensing and slip detection for robotic grasping still remain difficult due to considerations on sensor design, sensor performance, and sensor integration with robotic system. [13][14][15] From the application perspective, flexible tactile sensor capable of detecting the contact force and obtaining friction/slip information is desirable for intelligent robotic manipulators, if they are anticipated to adjust grasping force and posture in accordance with the shape, weight, and friction coefficient of the grasped objects for achieving dexterous manipulation and automatic grasping in scenarios such as human-machine interface, robotic surgery, intelligent manufacturing, etc.Flexible tactile sensors based on electrical sensing scheme, including capacitive, resistive, piezoelectric, and triboelectric mechanisms, have already been widely reported over the past decade. These electronic tactile sensors usually mimic the biological features of the delicate tactile sensation in human skin, such as the epidermis-dermis interface, sensory receptors, fingerprint patterns, and ionic stimuli in afferent neuron. [16][17][18][19][20] Multimodal sensing capabilities and other special properties ranging from self-healing, self-powering, energy harvesting, stimuli visualization, to environmental adaptation, have also been attempted in these electronic tactile sensors, but several drawbacks including high fabrication cost, parasite effect, complicated circuitry, and signal crosstalk may place constraints on their practical applications in robotics. [15,[21][22][23][24] AsThe finger skin of human plays a key role in amplifying and transferring tactile signals to sensory receptors, and it provides design guidelines for next-generation flexible tactile sensors. To enable robotic applications such as dexterous manipulation and tactile feedback, the functions of force sensing and slip detection are crucial for flexible tactile sensors. Here, a finger-skin inspired flexible optical (FIFO...

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“…This includes elastically deformable robot skins that merge tactile sensing with sensing for proprioception, physiological monitoring, and vision. While there has already been promising work in this domain [35,53,[104][105][106], there remain rich opportunities for further progress.…”

Section: Trends and Future Outlookmentioning

confidence: 99%

Soft Tactile Sensing Skins for Robotics

2021

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Purpose of Review Soft electronic skins (E-skins) capable of tactile pressure sensing have the potential to endow robotic systems with many of the same somatosensory properties of natural human skin. In this progress report, we review recent progress in creating soft tactile pressure sensing skins to give robots a sense of touch that resembles human skin sensing.Recent Findings For soft tactile pressure sensing skins, researchers have focused on five main sensing principles: (1) resistive; (2) capacitive; (3) magnetic; (4) barometric; and (5) optical. The combination of these traditional sensing techniques, along with the use of soft materials such as liquid metal and magnetic elastomers, has improved the perception capabilities and mechanical characteristics of artificial skin. In addition, the implementation of artificial intelligence and machine learning algorithms for data processing give robotic systems with these soft sensing skins an enhanced sense of touch.Summary E-skins for tactile sensing have a central role in a range of robotic applications, from haptics and teleoperation to bio-inspired soft robots. For many of these applications, E-skins must be soft, thin, flexible, stretchable, and lightweight so that they can be mounted on a robot, incorporated into clothing, or placed on human skin without interfering with mobility or contact mechanics. Significant research has been conducted on sensing techniques that can allow a robot to achieve a sense of human touch, with important progress being made in force feedback sensing, texture recognition, and spatial acuity. We begin by covering principles of tactile sensing in humans, robotics, and human-machine interaction. This is followed by an overview of soft material transducers capable of pressure and force sensing. This includes resistive, capacitive, magnetic, barometric, and optical sensing techniques. We close with a summary of emerging trends in sensor design and implementations for applications in robotics.

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Multifunctional Electronic Skin With a Stack of Temperature and Pressure Sensor Arrays

Abstract: Yogeenth Kumaresan received the B.Eng in Electronic and Communication Engineering from Anna University, India, the master's degree in Nanotechnology from Amity University, India, and the PhD degree in flexible and stretchable electronic devices from

Cited by 68 publications

References 55 publications

Soft Capacitive Pressure Sensor With Enhanced Sensitivity Assisted by ZnO NW Interlayers and Airgap

Soft Capacitive Pressure Sensor With Enhanced Sensitivity Assisted by ZnO NW Interlayers and Airgap

Finger‐Skin‐Inspired Flexible Optical Sensor for Force Sensing and Slip Detection in Robotic Grasping

Soft Tactile Sensing Skins for Robotics

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