Soft ionic liquid multi-point touch sensor

Fastier-Wooller, Jarred; Dinh, Toan; Dau, Van Thanh; Dao, Dzung Viet

doi:10.1039/c9ra00322c

Cited by 9 publications

(6 citation statements)

References 41 publications

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“…The sensing mechanism of ionic liquid is attributed to the relocation of cation and anion or the repopulation of the conductive ions. [ 143 ] Therefore, the sensitivity of strain/pressure sensors based on ionic liquids/gels is relatively low under a large stretchable range of strain. [ 39,143 ] These materials are typically designed in the architecture of resistors or capacitors towards strain sensing and touch applications.…”

Section: Materials For Stretchable Mechanical Sensorsmentioning

confidence: 99%

“…[ 143 ] Therefore, the sensitivity of strain/pressure sensors based on ionic liquids/gels is relatively low under a large stretchable range of strain. [ 39,143 ] These materials are typically designed in the architecture of resistors or capacitors towards strain sensing and touch applications. [ 160,161 ] For example, Figure 10C shows the core‐shell structure of ionic liquid embedded in carbon fiber rods for strain sensing and wearable applications.…”

Section: Materials For Stretchable Mechanical Sensorsmentioning

confidence: 99%

“…[ 142 ] The deformability of ILs inside containers has been used for multi‐touch and pressure sensing towards artificial and intelligent human‐machine interfaces (Figure 10D). [ 143 ] The main challenges for stretchable ionic mechanical sensors are to form reliable bonding with its container materials, including elastomers. [ 57,68 ] Table 4 summarizes the properties of some common intrinsic materials used for electromechanical sensors.…”

Section: Materials For Stretchable Mechanical Sensorsmentioning

confidence: 99%

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Advances in Rational Design and Materials of High‐Performance Stretchable Electromechanical Sensors

Dinh

Nguyen

Phan

et al. 2020

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curved surfaces and deformed objects. [5,6] An effective solution is using stretchable intrinsic materials and stretchable structural designs to form mechanical sensors. [7,8] Compared to conventional rigid sensors, it is desirable for stretchable sensors to provide mechanical robustness, biocomparability, multifunctionality, as well as comfort of wearing such sensors. [9,10] Stretchable electromechanical sensors are capable of being comfortably attached on the human body and skin and perceiving mechanical stimuli. These sensors have huge potential applications in personal healthcare, including detection of human motion/gesture, breath, and pulse monitoring. Stretchable electromechanical sensors have recently attracted great interest due to their high sensitivity, stretchability, simplicity in design, and implementation. Compared with the other kinds of sensors, for example, stretchable piezoelectric/triboelectric sensors, electromechanical sensors usually require supply power or battery.A stretchable sensor typically consists of a sensing block embedded or integrated into a stretchable substrate that can be elongated under application of mechanical stimuli. [11,12] The sensing block acts as a mechanical sensing unit, which for instance converts stress/strain into a measurable electrical signal. The presence of nanomaterials and composites in the sensing block has been utilized as a preferable design for stretchable sensors. [11,13] Selection criteria of these materials include structural stretchability, suitable conductivity, and high mechanical strength. Designing the sensing structure aims for high sensitivity, fast response, linearity, and a wide working range. [14,15] The integration of nanomaterials and nanocomposites into stretchable sensors are currently an emerging trend of wearable sensors in their research, development, and commercialization. [10,11] The development of stretchable sensors with low power consumption for portable applications is also of great interest. [16,17] The conventional design method for "partly stretchable" sensing devices integrates "hard" sensors and "soft" interconnects to form "island-interconnect" configurations. [18,19] This approach deploys an isolated island to carry the rigid sensors and a stretchable network of interconnections. Geometric engineering structures including serpentine and fractal designs have been widely employed, to achieve stretchability Stretchable and wearable sensor technology has attracted significant interests and created high technological impact on portable healthcare and smart human-machine interfaces. Wearable electromechanical systems are an important part of this technology that has recently witnessed tremendous progress toward high-performance devices for commercialization. Over the past few years, great attention has been paid to simultaneously enhance the sensitivity and stretchability of the electromechanical sensors toward high sensitivity, ultra-stretchability, low power consumption or selfpower functionalities, miniaturisation as well a...

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Section: Materials For Stretchable Mechanical Sensorsmentioning

confidence: 99%

Section: Materials For Stretchable Mechanical Sensorsmentioning

confidence: 99%

Section: Materials For Stretchable Mechanical Sensorsmentioning

confidence: 99%

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Advances in Rational Design and Materials of High‐Performance Stretchable Electromechanical Sensors

Dinh

Nguyen

Phan

et al. 2020

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“…In reality, the effects of temperature on the permittivity cause changes in capacitive output even in materials with a low temperature coefficient [7]. We estimate the effect of temperature on the permittivity = (∆ ⁄ ) /∆ of air gaps [8] and PAN [9] to be approx.…”

Section: Sensing Principle Capacitive Pressure Sensorsmentioning

confidence: 99%

In-Situ Depostion of Pressure and Temperature Sensitive E-Skin for Robotic Applications

Fastier-Wooller

Tran

et al. 2021

2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers)

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The development of a multimodal sensing platform with multiple layers for electronic skin (e-skin) sensing of temperature and pressure has attracted considerable interest to practical applications in soft robotics, humanmachine interfaces, and wearable health monitoring. In this work, we demonstrated a new platform technology with multiple sandwiched layers of highly oriented carbon nanotube membrane and polyacrylonitrile for the integration of pressure and temperature sensory functionalities into a single platform that is thin, ultralightweight, flexible, and wearable. The key technology of in situ deposition of sensor platform on objects or in robot interface makes this a unique method for the development of e-skins for robotic applications, offering a new approach to wearable electronics and portable health care.

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“…6−8 Except for flexible films made with elegantly designed conductive polymers, 9,10 few soft materials are intrinsically conductive. For this reason, carbon nanotubes, 11−13 graphene, 14−16 silver nanowires, 17−19 inorganic salts, 20−22 and ionic liquids 23,24 were often doped to achieve desired conductivity. Inkjet printing, 25 laser manufacturing, 26 and 3D printing of these materials on a soft substrate 25 were also employed to create patterned sensors.…”

Section: Introductionmentioning

confidence: 99%

Wearable Sensors Based on Solid-Phase Molecular Self-Assembly: Moisture-Strain Dual Responsiveness Facilitated Extremely High and Damage-Resistant Sensitivity

Gao

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Wearable sensing technologies have gained increasing interest in biomedical fields because they are convenient and could efficiently monitor health conditions by detecting various physiological signals in real time. However, common film sensors often neglect body moisture and enhance the sensitivity by enhancing the conductive dopants and self-healing ability. We report in this work a supramolecular film sensor based on solid-phase molecular self-assembly (SPMSA), which smartly utilizes the body moisture to enhance the sensitivity for human-machine interaction. The carbon nanotube (CNT)-doped SPMSA film is able to capture environmental moisture quickly. Upon contact to human skin, the moisture not only promotes the junction between CNTs but also contributes to the conductivity. As a result, the sensitivity can be enhanced 4 times. In this way, we are able to obtain the highest sensitivity of 700% with the lowest CNT doping rate of 0.5%. Furthermore, the current sensor displays damage-inert sensing performance. In the presence of a hole of up to 50% of the film area, the sensitivity remains unaffected due to the decreases in the absolute conductivity of the film sensor before and after a trigger to the same extent. In this way, we have developed a new principle in the design of a film sensor for human-machine interaction, which releases the sensor from focus on promoting conductivity and self-healing materials.

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Soft ionic liquid multi-point touch sensor

Cited by 9 publications

References 41 publications

Advances in Rational Design and Materials of High‐Performance Stretchable Electromechanical Sensors

Advances in Rational Design and Materials of High‐Performance Stretchable Electromechanical Sensors

In-Situ Depostion of Pressure and Temperature Sensitive E-Skin for Robotic Applications

Wearable Sensors Based on Solid-Phase Molecular Self-Assembly: Moisture-Strain Dual Responsiveness Facilitated Extremely High and Damage-Resistant Sensitivity

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