Liquid Metal-Based Wearable Tactile Sensor for Both Temperature and Contact Force Sensing

Wang, Yancheng; Lu, Yingtong; Mei, Deqing; Zhu, Linli

doi:10.1109/jsen.2020.3015949

Cited by 52 publications

(33 citation statements)

References 35 publications

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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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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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“…Due to its natural advantages of high electrical conductivity, high thermal conductivity, fluidity, and controllable deformation, LM has been widely used in switches [39][40][41][42][43], reconfigurable antennas [48][49][50][51][52][53][54][55], microwave devices [10][11][12][13], sensors [57][58][59][60], and wearable devices and flexible circuits [62][63][64]. Gallium-based LM can be used as a substrate integrated waveguide switch [39] and can also be used as a thermal switch controlling heat transfer spatially and temporally [42].…”

Section: Discussionmentioning

confidence: 99%

“…Wearable tactile sensors can be used for tactile perception and are widely used in applications such as soft robots and smart prostheses. A wearable tactile sensor based on LM (Galinstan) can sense temperature and contact force simultaneously, as shown in Figure 18 [60]. LM was injected into the fingerprint-shaped microfluidic channel, and the output voltage signal of temperature and contact force sensing was decoupled through the structural design of a Wheatstone bridge circuit, fingerprint pattern microfluidic channel and top elliptical protrusion.…”

Section: Liquid Metal Sensorsmentioning

confidence: 99%

Liquid Metal-Based Devices: Material Properties, Fabrication and Functionalities

et al. 2021

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This paper reviews the material properties, fabrication and functionalities of liquid metal-based devices. In modern wireless communication technology, adaptability and versatility have become attractive features of any communication device. Compared with traditional conductors such as copper, the flow characteristics and lack of elastic limit of conductive fluids make them ideal alternatives for applications such as flexible circuits, soft electronic devices, wearable stretch sensors, and reconfigurable antennas. These fluid properties also allow for innovative manufacturing techniques such as 3-D printing, injecting or spraying conductive fluids on rigid/flexible substrates. Compared with traditional high-frequency switching methods, liquid metal (LM) can easily use micropumps or an electrochemically controlled capillary method to achieve reconfigurability of the device. The movement of LM over a large physical dimension enhances the reconfigurable state of the antenna, without depending on nonlinear materials or mechanisms. When LM is applied to wearable devices and sensors such as electronic skins (e-skins) and strain sensors, it consistently exhibits mechanical fatigue resistance and can maintain good electrical stability under a certain degree of stretching. When LM is used in microwave devices and paired with elastic linings such as polydimethylsiloxane (PDMS), the shape and size of the devices can be changed according to actual needs to meet the requirements of flexibility and a multistate frequency band. In this work, we discuss the material properties, fabrication and functionalities of LM.

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“…[ 17 ] Besides the mechanical conformability, the fluidic nature enables self‐healing after excessive strain or disconnection, [ 18,19 ] and facile structural manipulation and processing. [ 20 ] Also, they are responsive to diverse stimuli such as strain, [ 21 ] temperature, [ 22 ] electromagnetic field, [ 23,24 ] and chemical environments, [ 25 ] which hold a promising potential as functional materials for healthcare monitoring, diagnosis, and therapeutics. Latest works on the biomedical application of liquid metals as physiotherapeutic agents and implantable devices demonstrate their biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Liquid Metal‐Based Soft Electronics for Wearable Healthcare

Park

Lee

Jang

et al. 2021

Adv Healthcare Materials

144

100

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Wearable healthcare devices have garnered substantial interest for the realization of personal health management by monitoring the physiological parameters of individuals. Attaining the integrity between the devices and the biological interfaces is one of the greatest challenges to achieving high‐quality body information in dynamic conditions. Liquid metals, which exist in the liquid phase at room temperatures, are advanced intensively as conductors for deformable devices because of their excellent stretchability and self‐healing ability. The unique surface chemistry of liquid metals allows the development of various sensors and devices in wearable form. Also, the biocompatibility of liquid metals, which is verified through numerous biomedical applications, holds immense potential in uses on the surface and inside of a living body. Here, the recent progress of liquid metal‐based wearable electronic devices for healthcare with respect to the featured properties and the processing technologies is discussed. Representative examples of applications such as biosensors, neural interfaces, and a soft interconnection for devices are reviewed. The current challenges and prospects for further development are also discussed, and the future directions of advances in the latest research are explored.

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Liquid Metal-Based Wearable Tactile Sensor for Both Temperature and Contact Force Sensing

Cited by 52 publications

References 35 publications

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

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

Liquid Metal-Based Devices: Material Properties, Fabrication and Functionalities

Liquid Metal‐Based Soft Electronics for Wearable Healthcare

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