Flexible Capacitive Pressure Sensor Based on Laser–Induced Graphene and Polydimethylsiloxane Foam

Huang, Lixiong; Wang, Han; Zhan, Daohua; Fang, Feiyu

doi:10.1109/jsen.2021.3054985

Cited by 35 publications

(18 citation statements)

References 59 publications

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“…When a morphing aircraft is impacted by an object, the local area at the impact position will be deformed, thus resulting in the resistance variation of the strain sensor in the corresponding area [96] . In addition to morphing aircraft, LIG-based strain sensors can also be used in other devices, such as gesture monitoring for robots [46] . The linear range of LIG-based strain sensors with polyimide substrate is ~2%, beyond which the deformation of polyimide enters into the plastic stage.…”

Section: Strain Sensormentioning

confidence: 99%

“…To fabricate the thinner flexible electronics with smaller linewidth, selecting a laser with shorter wavelengths (e.g., 355 nm [40,41] ) and controlling process parameters are two common methods, which enable the fabrication of the visually invisible LIG with a linewidth of 10 μm [42] . Besides, any desired LIG pattern can be directly fabricated on various flexible substrates, including polyimide [43,44] , polyethylene terephthalate [45] , PDMS [46][47][48] , and flexible cellulose paper [49][50][51] . In particular, the properties of LIG, including hole size, hydrophilic/hydrophobic, and square resistance, have been proven to be adjustable [52,53] .…”

Section: Introductionmentioning

confidence: 99%

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Laser-induced direct graphene patterning: from formation mechanism to flexible applications

2023

Soft Sci

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Laser-induced graphene (LIG), which is directly fabricated by laser carbonization of polymers, has gained much attention in recent years since its first discovery in 2014. Specifically, featuring native porosity, good mechanical properties, and excellent electrical/electrochemical properties, it is considered a promising material for flexible electronic devices. Meantime, LIG can be processed in the atmosphere within a few seconds, thereby significantly reducing the fabrication cost of graphene. Facilitated by these features, this methodology has received great development with worldwide efforts in the following years, including the formation mechanism of LIG, the diversity of laser sources (from infrared laser to ultraviolet laser), the diversity of carbon sources (thermoset polymers, thermoplastic polymers, and natural polymers), and property modulation of LIG (porosity, electrical property, hydrophilic/hydrophobic property, electrochemical property), along with the broad applications of LIG in various flexible electronic devices. Here, the recent advances in the mechanism studies and preparation methods of LIG are comprehensively summarized. The various technologies for the modification of LIG are reviewed. A thorough overview of typical LIG-based flexible electronic devices is presented. Finally, the current challenges and future directions are discussed.

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Section: Strain Sensormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser-induced direct graphene patterning: from formation mechanism to flexible applications

2023

Soft Sci

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“…Many conductive materials, such as carbon nanotubes [ 24 , 25 , 26 ], graphene [ 27 , 28 ], and metal nanoparticles [ 29 , 30 , 31 ], have been used in flexible pressure sensors. Among these, graphene and its derivatives demonstrate great potential, owing to their excellent mechanical properties and adjustable microstructures [ 32 , 33 , 34 , 35 ]. To meet the requirements for wearable electronics and electronic skins, it is necessary to develop a flexible graphene-based pressure sensor with high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Flexible Capacitive Pressure Sensors Based on Vertical Graphene and Micro-Pyramidal Dielectric Layer

Zhao

Han

et al. 2023

Nanomaterials

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Many practical applications require flexible high-sensitivity pressure sensors. However, such sensors are difficult to achieve using conventional materials. Engineering the morphology of the electrodes and the topography of the dielectrics has been demonstrated to be effective in boosting the sensing performance of capacitive pressure sensors. In this study, a flexible capacitive pressure sensor with high sensitivity was fabricated by using three-dimensional vertical graphene (VG) as the electrode and micro-pyramidal polydimethylsiloxane (PDMS) as the dielectric layer. The engineering of the VG morphology, size, and interval of the micro-pyramids in the PDMS dielectric layer significantly boosted the sensor sensitivity. As a result, the sensors demonstrated an exceptional sensitivity of up to 6.04 kPa−1 in the pressure range of 0–1 kPa, and 0.69 kPa−1 under 1–10 kPa. Finite element analysis revealed that the micro-pyramid structure in the dielectric layer generated a significant deformation effect under pressure, thereby ameliorating the sensing properties. Finally, the sensor was used to monitor finger joint movement, knee motion, facial expression, and pressure distribution. The results indicate that the sensor exhibits great potential in various applications, including human motion detection and human-machine interaction.

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“…To solve this problem, there are two strategies: (1) Adding conductive fillers into dielectric materials; Filippidou et al used to add carbon materials into PDMS to fabricate the graphene nanosheet/PDMS capacitive strain sensor that exhibited good performance in small strains applications (≤0.2%) [20]. (2) Changing the internal structure; Huang et al proposed a uniform pore size-distributed dielectric layer by controlling the PDMS ratios and curing temperatures, thereby to improve the sensing property [21]. However, few studies investigate the relationship between the sensing capacity and different elastic modulus of PDMS under non-complete curing conditions.…”

Section: Introductionmentioning

confidence: 99%

Flexible acetylene black/PDMS capacitive pressure sensor with enhanced sensitivity based on percolation principle

Sun¹,

Li²,

Lin³

et al. 2023

International Conference on Optoelectronic Materials and Devices (ICOMD 2022)

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Recent advances in soft materials have provided a great opportunity for the development of flexible electronics. This study proposed a novel capacitive pressure sensors with enhanced sensitivity by adopting the materials of acetylene black and polydimethylsiloxane (PDMS). Based on the percolation principle, spacing of conductive particles, which closely associated with sensing performance, were adjusted by controlling the concentration of filled acetylene black and its curing time with PDMS. An optimized acetylene black/PDMS capacitive pressure sensor was finally fabricated achieving a sensitivity of 0.248 kPa −1 in the range of 4-50 kPa which is nearly five times higher than that of the pure PDMS sensor. Additionally, this developed soft sensor also present a quick response time and excellent stability that may have great potential to be applied in wearable and real-time monitoring. Furthermore, this systematical investigation and optimization towards material processing techniques may provide evidence-based guidance for the improvement of soft material-based capacitive pressure sensors.

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Flexible Capacitive Pressure Sensor Based on Laser–Induced Graphene and Polydimethylsiloxane Foam

Cited by 35 publications

References 59 publications

Laser-induced direct graphene patterning: from formation mechanism to flexible applications

Laser-induced direct graphene patterning: from formation mechanism to flexible applications

Highly Sensitive and Flexible Capacitive Pressure Sensors Based on Vertical Graphene and Micro-Pyramidal Dielectric Layer

Flexible acetylene black/PDMS capacitive pressure sensor with enhanced sensitivity based on percolation principle

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