Force and humidity dual sensors fabricated by laser writing on polyimide/paper bilayer structure for pulse and respiration monitoring

Luo, Jiangjiang; Yao, Yanbo; Duan, Xiaoshuang; Liu, Tao

doi:10.1039/c8tc00457a

Cited by 61 publications

(53 citation statements)

References 38 publications

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“…The DLWc generated carbon patterns have found a variety of electrically related potential applications . To materialize this technique, the relationship of the processing‐structure‐electrical property involved in DLWc has to be established.…”

Section: Resultsmentioning

confidence: 99%

Processing–structure–property relationship in direct laser writing carbonization of polyimide

Wang

Duan

Yao

et al. 2020

J of Applied Polymer Sci

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Direct laser writing carbonization (DLWc) of polyimide has recently emerged as a versatile method for facile fabrication of a variety of functional devices. Up‐to‐date, there is still a lack of comprehensive and in‐depth experimental studies to understand the processing‐structure–property relationship involved in this promising technique. With assistance of methylene blue adsorption as an in situ porous structure characterization method along with scanning electron microscopy, Raman scattering spectroscopy, X‐ray photoelectron spectroscopy, and electrical property measurements, we systematically investigate the multiscale structure evolution and the electrical sheet resistance of the carbon lines fabricated by DLWc at varied laser processing conditions. The key processing parameters being investigated included: laser power (P), laser beam scanning speed (S), distance of laser beam waist to the surface of polyimide film (D), and their combined effect—the averaged areal laser energy density—(E). Quantitative relationships are established between these processing parameters and the specific surface area, the porosity, the degree of perfection of the layered carbon or graphitic basic structure units, as well as the electrical sheet resistance of the carbon lines created by DLWc. The comprehensive and quantitative processing‐multiscale structure–electrical property relationships for DLWc established in this study expect to be useful for better understanding the complicated photo‐thermally induced polyimide pyrolysis/carbonization process.

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Section: Resultsmentioning

confidence: 99%

Processing–structure–property relationship in direct laser writing carbonization of polyimide

Wang

Duan

Yao

et al. 2020

J of Applied Polymer Sci

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“…Humidity and force sensors have been prepared by Luo et al on polyimide (PI)/paper composite substrate through LDW. [30] Ziaie and co-workers reported an LDW-fabricated stretchable PH sensor on PI. [31] The above researches have inspired us that LDW might be used for maskless fabrication of flexible sensors directly on textile and leather without additional precursors, since the materials constructed for the textile and leather, such as wool, flax, cotton, and collagen, have abundant carbon species.…”

Section: Introductionmentioning

confidence: 99%

Maskless Formation of Conductive Carbon Layer on Leather for Highly Sensitive Flexible Strain Sensors

Wang

Chen

Sun

et al. 2020

Adv Elect Materials

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Development of strain sensors on flexible and breathable leather or textile has potential applications in Internet of Things, human–machine interfaces, and motion detection. Nevertheless, the fabrication of strain sensors with high performance on the above substrates in a maskless, scalable, and highly efficient manner is still a challenge. In this study, highly sensitive strain sensors are mask‐freely fabricated on leather by a highly efficient and scalable laser direct writing (LDW) technique in open air without using any additional precursors. The strain sensors are constructed by the carbon flake synthesized by LDW carbonization of collagen fibers in the leather. The LDW carbonized leather‐based device provides maximum sensitivities of ≈2009.5 and ≈50.9 for tension and compression strain detection, respectively. Additionally, the device has a minimum detection strain of 0.005% and a good mechanical stability over 10 000 bending cycles. The high performance of the flexible strain sensors as well as the developed maskless, scalable and highly efficient LDW technique endows the promising applications of the devices in human motion monitoring and external stimuli detection.

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“…In recent years, flexible wearable and portable electronic products that can meet various special needs have gained rapid growth and received widespread attention. [1] Flexible electronic devices, including flexible sensors, [2][3][4] flexible transistors, [5] flexible supercapacitors, [6,7] flexible nanogenerators, [8] flexible screen panel, [9] flexible light-emitting diodes, [10] flexible photodetectors, [11] flexible thin-film solar cell, [12] etc., are developing the film under repeated deformation is much less than ITObased flexible films. However, silver has relatively high material cost.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, flexible wearable and portable electronic products that can meet various special needs have gained rapid growth and received widespread attention . Flexible electronic devices, including flexible sensors, flexible transistors, flexible supercapacitors, flexible nanogenerators, flexible screen panel, flexible light‐emitting diodes, flexible photodetectors, flexible thin‐film solar cell, etc., are developing toward flexibility, intelligence, and high integration, and the materials with good photoelectric performance, excellent processibility, low cost, good reliability, and chemical stability are highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Flexible Fabrication of Flexible Electronics: A General Laser Ablation Strategy for Robust Large‐Area Copper‐Based Electronics

Qin

Zhang

et al. 2019

Adv Elect Materials

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toward flexibility, intelligence, and high integration, and the materials with good photoelectric performance, excellent processibility, low cost, good reliability, and chemical stability are highly desirable.Compared with traditional rigid devices, flexible electronics can adapt to different working environments and meet the requirements of various deformations while maintaining the normal functions of electronic devices. In flexible photoelectric devices, the flexible transparent conducting electrodes (FTCEs) are an indispensable part, and currently the most widely used FTCE is indium tin oxide (ITO)-coated transparent plastic film. However, ITO coated film has the following shortcomings: high cost of indium, large material waste in the production process, the requirement of expensive highvacuum equipment, and the most important one-intrinsic brittleness of ITO, which is incompatible with the future lowcost wearable flexible electronic devices. [13] In order to develop inexpensive and reliable alternatives of ITO, many novel materials and fabrication methods have been put forward. Metal nanowires (NWs) are considered to be the most promising alternatives of ITO for fabricating high-performance FTCEs. [13] Recently, silver nanowires mesh structures have been widely employed as conductive layer on flexible transparent substrate, and superior light transmission and conductivity have been obtained. More importantly the performance degradation of Attributed to high power density and controllable digital program operation, lasers are a powerful tool in the preparation, prototype fabrication, and post-processing of materials. In this paper, a general laser ablation strategy that can be conducted under ambient, room-temperature, and mask-free conditions is employed for the rapid fabrication of robust large-area copperbased flexible electronics. Micrometer-scale thick copper layer cladded on flexible polymer substrate can be removed efficiently in one laser scanning pass based on laser-induced heat evaporation effect. Metal grids with a width less than 10 microns and a thickness close to 2 microns can be produced in a reliable manner. As proof-of-concept demonstrations, flexible transparent conducting electrodes and a variety of flexible circuit boards (FCBs) with different precisions and dimensions are fabricated by this approach in a digitally controlled mode and their photoelectric properties under normal and deformation states are investigated. The results indicate that the method is robust and asprepared flexible electrodes and circuits are reliable and endurable, indicative of the potential of this method in scalable fabrication of sub-millimeter flexible electronics through a straightforward and flexible fashion.

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Force and humidity dual sensors fabricated by laser writing on polyimide/paper bilayer structure for pulse and respiration monitoring

Abstract: Paper-based sensing technology was combined with direct laser writing for designing and fabricating low-cost wearable multifunctional sensors.

Cited by 61 publications

References 38 publications

Processing–structure–property relationship in direct laser writing carbonization of polyimide

Processing–structure–property relationship in direct laser writing carbonization of polyimide

Maskless Formation of Conductive Carbon Layer on Leather for Highly Sensitive Flexible Strain Sensors

Flexible Fabrication of Flexible Electronics: A General Laser Ablation Strategy for Robust Large‐Area Copper‐Based Electronics

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