A laser-engraved wearable gait recognition sensor system for exoskeleton robots

Sun, Maowen; Cui, Songya; Wang, Zezheng; Luo, Huayu; Yang, Huayong; Ouyang, Xiaoping; Xu, Kaichen

doi:10.1038/s41378-024-00680-x

Cited by 17 publications

(2 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various methods, such as spraying, sputtering, and spinning, have been recommended for coating the conductive material onto the sensor. , However, the key to enhancing sensor sensitivity lies in maximizing its initial resistance in the absence of contact and minimizing resistance upon the application of pressure to amplify the change in the resistance signal. Spray coating with conductive fiber-like nanomaterials offers a viable solution to achieve both benefits and enhance sensor sensitivity. , Carbon nanofibers (CNF), known for their excellent electrical and thermal conductivity, high specific modulus, specific strength, and thermal stability, exhibit intrinsic properties of carbon-based nanomaterials while retaining the softness and processability of textile fibers …”

Section: Introductionmentioning

confidence: 99%

Bioinspired Low Hysteresis Flexible Pressure Sensor Using Nanocomposites of Multiwalled Carbon Nanotubes, Silicone Rubber, and Carbon Nanofiber for Human–Computer Interaction

Guo,

Liu,

Tang

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The development and utilization of flexible piezoresistive sensors based on bionic nanomaterials have garnered considerable attention due to their broad potential in various domains. However, the key to their enhanced performance lies in incorporating microstructures and conductive coatings, which maximize initial resistance and minimize resistance upon pressure application, thereby amplifying the change in resistance signal. In this study, we draw inspiration from the microconvex structure observed on the skin of crocodiles and propose a bionic-structured flexible pressure sensor. The sensor is fabricated using nanocomposites comprising multiwalled carbon nanotubes, silicone rubber, and carbon nanofiber in conjunction with a three-dimensional (3D)-printed bionic structural mold. Sensor structure is similar to a sandwich structure with three layers: a flexible substrate layer, a sensing layer, and an interdigital electrode layer. Our sensor exhibits improved pressure-sensing capabilities, characterized by rapid response and recovery times (25 ms), a wide pressure detection range (0−80 kPa), minimal hysteresis (2.44%), high sensitivity (0.4311 kPa −1 within the 0−10 kPa range), and fine stability (withstanding 6000 cycles under varying pressures). Notably, this sensor has an efficient sensing ability, long-term stability, and good waterproofing properties, expanding its potential applications in human−computer interaction, motion monitoring, intelligent robotics, and underwater rescue operations.

show abstract

Section: Introductionmentioning

confidence: 99%

Bioinspired Low Hysteresis Flexible Pressure Sensor Using Nanocomposites of Multiwalled Carbon Nanotubes, Silicone Rubber, and Carbon Nanofiber for Human–Computer Interaction

Guo,

Liu,

Tang

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Ha et al developed highly sensitive and ultrafast e-skins using bioinspired hierarchical ZnO NW arrays with interlocked geometry ( S max = −6.8 kPa –1 and detection range of 0–12 kPa) . However, the fabrication of microstructures typically involves molding or subtractive fabrication methods such as laser processing, − which often face challenges in large-scale production (e.g., screen printing). This makes it difficult to move from laboratory to real world.…”

Section: Introductionmentioning

confidence: 99%

Screen-Printable Iontronic Pressure Sensor with Thermal Expansion Microspheres for Pulse Monitoring

Yang,

Zhao,

Lan

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Constructing microstructures to improve the sensitivity of flexible pressure sensors is an effective approach. However, the preparation of microstructures usually involves inverted molds or subtractive manufacturing methods, which are difficult in large-scale (e.g., in screen printing) preparation. To solve this problem, we introduced thermally expandable microspheres for screen printing to fabricate flexible sensors. Thermally expandable microspheres can be constructed into microstructures by simple heating after printing, which simplifies the microstructure fabrication step. In addition, the added microspheres can also be used as ionic liquid reservoir materials to further increase the capacitance change and improve the sensitivity. The prepared sensors exhibited superior performance, including ultrahigh sensitivity (S max = 49999.5 kPa −1 ) and wide detection range (0− 350 kPa). Even after 30,000 cycles at a high pressure of 300 kPa and a low pressure of 30 kPa, the sensor showed minimal signal degradation, demonstrating long-term cycling stability. In order to verify the practical potential of the sensors, we performed human radial artery beat detection experiments using these sensors. The variations in the intensity of the 3D radial artery pulse wave can be observed very clearly, which is important for human health monitoring. The above demonstrates that our strategy can provide an effective approach for the large-scale preparation of high-performance flexible pressure sensors.

show abstract

Bio‐Inspired Hybrid Laser Direct Writing of Interfacial Adhesion for Universal Functional Coatings

Cai,

Miao,

Zhang

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Enhancing interfacial adhesion between functional coatings and target surfaces facilitates long‐term stable service by mitigating interferences of mechanical mismatches. Design of mechanical interlocks affords an effective strategy to strengthen the interfacial bonding with durability and compatibility, but the in‐depth investigations are still lacked. Herein, a gecko‐inspired hierarchical strategy realized by hybrid laser direct writing is proposed, which incorporates an armored frame scale for surface protection and a riveted anchor scale for interlocks. Such dual‐scale configurations endow the functional coatings with the stronger adhesion to the targets than the pristine and mono‐scale cases, resulting in 2 orders of magnitude enhancement resistant to tape peeling tests. Utilizing this scheme, a laser‐induced integrated deicing system is in situ manufactured on thermoplastics, primarily comprising superhydrophobic structures, carbon‐based sensors as well as adhesive copper (Cu) interconnects and heaters, where Cu‐based devices exhibit superior resistance to water impacts and stress fatigue. Interfacing with signal processing modules, such an all‐in‐one system demonstrates real‐time temperature monitoring and high efficiency in deicing (4.24 folds faster than the control group). The facile route for intensified adhesion holds promise in the interfaces within advanced equipment and under harsh scenarios.

show abstract

A laser-engraved wearable gait recognition sensor system for exoskeleton robots

Cited by 17 publications

References 46 publications

Bioinspired Low Hysteresis Flexible Pressure Sensor Using Nanocomposites of Multiwalled Carbon Nanotubes, Silicone Rubber, and Carbon Nanofiber for Human–Computer Interaction

Bioinspired Low Hysteresis Flexible Pressure Sensor Using Nanocomposites of Multiwalled Carbon Nanotubes, Silicone Rubber, and Carbon Nanofiber for Human–Computer Interaction

Screen-Printable Iontronic Pressure Sensor with Thermal Expansion Microspheres for Pulse Monitoring

Bio‐Inspired Hybrid Laser Direct Writing of Interfacial Adhesion for Universal Functional Coatings

Contact Info

Product

Resources

About