Facile fabrication of flexible strain sensors with AgNPs-decorated CNTs based on nylon/PU fabrics through polydopamine templates

Zhao, Shanshan; Zheng, Peixiao; Cong, Honglian; Wan, Ailan

doi:10.1016/j.apsusc.2021.149931

Cited by 39 publications

(23 citation statements)

References 60 publications

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“…Strain sensors hold great potential to be used in wearable devices, soft robots, building protection, muscle movement, and health issue detection. − The working principle of strain sensors is to convert resistance caused by physical deformation into an electrical signal . Traditional strain sensors based on metal or semiconductor materials cannot meet the sensing needs of the existing market due to their high stiffnesses, small working ranges (ca.…”

Section: Introductionmentioning

confidence: 99%

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Biodegradable Polyurethane Fiber-Based Strain Sensor with a Broad Sensing Range and High Sensitivity for Human Motion Monitoring

Liu

Zhang

et al. 2022

ACS Sustainable Chem. Eng.

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To date, a majority of polymer-based wearable flexible strain sensors are non-biodegradable, which inevitably causes environmental pollution at the end of their service life. In this work, biodegradable polyurethane (BPU) was synthesized and then processed with carbon nanotubes (CNTs) via wet spinning into BPU/CNT composite fibers used as strain sensors. The synthesized BPU showed excellent biodegradability with a 19.45% weight loss in 42 days in a phosphate buffered saline (PBS) solution. Compared with previously reported strain sensors made from silk, cellulose, and polylactic acid, the BPU/12%CNT fibers achieved a much wider strain-sensing range (0−250%) and a high sensitivity (gauge factors of 15 at 100% strain and of 2468 at 250% strain respectively) while exhibiting reliable stability. These properties allow strain sensors based on BPU/CNT fibers and knitted fabric to be successfully used for monitoring various human motions. Moreover, biodegradability of the BPU/CNT strain sensor in a PBS solution was verified. In consequence, this work provides insights into the development of biodegradable wearable electronic devices.

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Section: Introductionmentioning

confidence: 99%

“…1−4 The working principle of strain sensors is to convert resistance caused by physical deformation into an electrical signal. 5 Traditional strain sensors based on metal or semiconductor materials cannot meet the sensing needs of the existing market due to their high stiffnesses, small working ranges (ca. 5%), and low sensitivities.…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Polyurethane Fiber-Based Strain Sensor with a Broad Sensing Range and High Sensitivity for Human Motion Monitoring

Liu

Zhang

et al. 2022

ACS Sustainable Chem. Eng.

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“…), selecting different conductive functional materials (like C-based materials and metal nanowires), or introducing various structures (Gaussian microstructures, micro-pyramid structures, etc. ). − Though excellent properties of strain sensors, including high sensitivity and good durability, have been achieved, there are still some disadvantages, such as complex manufacturing processes and high cost, which limit the practical applications of flexible strain sensors. Therefore, a strain sensor with excellent sensitivity, low cost, and a short manufacturing cycle remains a great challenge.…”

Section: Introductionmentioning

confidence: 99%

Flexible Equivalent Strain Sensor with Ordered Concentric Circular Curved Cracks Inspired by Scorpion

Meng

Sun

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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Slit sensillum, a unique sensing organ on the scorpion’s legs, is composed of several cracks with curved shapes. In fact, it is just its particular morphological distribution and structure that endows the scorpions with ultrasensitive sensing capacity. Here, a scorpion-inspired flexible strain sensor with an ordered concentric circular curved crack array (CCA) was designed and fabricated by using an optimized solvent-induced and template transfer combined method. The morphology of the cracks can be effectively controlled by the heating temperature and the lasting time. Instead of the nonuniform stress distribution induced by disordered cracks, ordered concentric circle curved structures are introduced to generate a uniform stress distribution and larger deformation, which can significantly improve the performance of the strain sensor. Thus, the CCA sensor exhibits ultrahigh sensitivity (GF ∼ 7878.6), excellent stability (over 16 000 cycles), and fast response time (110 ms). Furthermore, the CCA sensor was demonstrated to be feasible for monitoring human motions and detecting noncontact vibration signals, indicating its great potential in human-health monitoring and vibration signal detection applications.

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“…The high performance of such sensors largely relies on the strain transfer from the elastomer substrate to the conductive film, which leads to the crack propagation in active materials and change of conductive path [ 12 , 13 ]. To improve the sensitivity of strain sensors, many previous works have focused on the development of highly conductive materials, such as Ag nanowires [ 14 ], graphene [ 15 , 16 , 17 , 18 ], carbon nanotubes [ 19 , 20 , 21 ], and conductive composites [ 22 , 23 , 24 , 25 ]. However, the enhancement of sensitivity of the stretchable strain sensor is often accompanied with the degradation of response range.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable, Stretchable Strain Sensor with the Localized Controlling of Substrate Modulus by Two-Phase Liquid Metal Cells

et al. 2022

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Strain modulation based on the heterogeneous design of soft substrates is an effective method to improve the sensitivity of stretchable resistive strain sensors. In this study, a novel design for reconfigurable strain modulation in the soft substrate with two-phase liquid cells is proposed. The modulatory strain distribution induced by the reversible phase transition of the liquid metal provides reconfigurable strain sensing capabilities with multiple combinations of operating range and sensitivity. The effectiveness of our strategy is validated by theoretical simulations and experiments on a hybrid carbonous film-based resistive strain sensor. The strain sensor can be gradually switched between a highly sensitive one and a wide-range one by selectively controlling the phases of liquid metal in the cell array with a external heating source. The relative change of sensitivity and operating range reaches a maximum of 59% and 44%, respectively. This reversible heterogeneous design shows great potential to facilitate the fabrication of strain sensors and might play a promising role in the future applications of stretchable strain sensors.

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Facile fabrication of flexible strain sensors with AgNPs-decorated CNTs based on nylon/PU fabrics through polydopamine templates

Cited by 39 publications

References 60 publications

Biodegradable Polyurethane Fiber-Based Strain Sensor with a Broad Sensing Range and High Sensitivity for Human Motion Monitoring

Biodegradable Polyurethane Fiber-Based Strain Sensor with a Broad Sensing Range and High Sensitivity for Human Motion Monitoring

Flexible Equivalent Strain Sensor with Ordered Concentric Circular Curved Cracks Inspired by Scorpion

Reconfigurable, Stretchable Strain Sensor with the Localized Controlling of Substrate Modulus by Two-Phase Liquid Metal Cells

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