Phosphoric acid involved laser induced microporous graphene via proton conducting polybenzimidazole for high-performance micro-supercapacitors

Han, Mingguang; He, Meihong; Wang, Guantao; Luo, Sida

doi:10.1016/j.jpowsour.2021.230579

Cited by 20 publications

(15 citation statements)

References 30 publications

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“…The PA− PBI carbonized electrode (PA−PBI-C) exhibits ordered island arrays with microporous structure, which is attributed to small amount of molecular gas produced by PA during the laser fabrication. 30 At the same time, heteroatoms such as P atoms enrich the chemically modified structure, as schematically shown in Figure 1f. In contrast to PA−PBI-C, inserted PA and water molecules merge together with PBI polymer with invisible micro structures, resulting in smooth surface of PA−PBI electrolyte.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Furthermore, Figure f shows the morphology distinction between the electrode and the all-solid-state electrolyte with microstructural schemes. The PA–PBI carbonized electrode (PA–PBI-C) exhibits ordered island arrays with microporous structure, which is attributed to small amount of molecular gas produced by PA during the laser fabrication . At the same time, heteroatoms such as P atoms enrich the chemically modified structure, as schematically shown in Figure f.…”

Section: Resultsmentioning

confidence: 99%

“…In previous work of LIG capacitors, electrode area S can also be strictly controlled to have a visible size through a precise automation control of the laser fabrication; meanwhile, the reported polymer substrates usually remain steady state during capacitor application. − In order to promote capacitance, specific surface area enhancement caused by a microporous structure is usually preferred, because of S improvement in microsize. As for PA–PBI-C, a porous structure has been proved to be successful in capacitance enhancement in our previous work . But when it comes to a visible size, it is unknown whether S will change because of the swelling property of the PA–PBI substrate.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Ultrasensitive Humidity Sensors with Synergy between Superhydrophilic Porous Carbon Electrodes and Phosphorus-Doped Dielectric Electrolyte

Han

Ding

Duan

et al. 2023

ACS Appl. Mater. Interfaces

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Capacitive humidity sensors have been used for human health monitoring, but their performance may be poor in terms of sensitivity and response time, because of limitations in sensing materials and insufficient knowledge about sensing mechanisms. Herein, a new combination of humidity sensing materials to assemble thin-film based capacitive-type sensors is proposed by using PA-doped polybenzimidazole (PA−PBI) as an electrolyte and laser-carbonized PA−PBI as a carbon electrode (PA−PBI-C). Based on PA involved laser scribing, the flexible sensor can reach excellent humidity-sensing performances with an ultrahigh sensitivity (1.16 × 10 6 pF RH% −1 , where RH represents the relative humidity), a superior linearity (R 2 = 0.9982), a fast response time (0.72 s), and a low hysteresis in a wide RH range from 1% to 95%. By further studying P−O decorated porous carbon electrode with superhydrophilicity and the solid-state dielectric electrolyte featured by a high dielectric constant, a synergistic sensing mechanism consisting of a "Water reservoir" and a "Bridge" is established to support advanced health-monitoring applications such as the respiration patterns and skin condition where both sensitivity and response time are critical.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ultrasensitive Humidity Sensors with Synergy between Superhydrophilic Porous Carbon Electrodes and Phosphorus-Doped Dielectric Electrolyte

Han

Ding

Duan

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

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“…[ 18,19 ] Depending on the intensity of the laser power, one can use a laser to cut materials in various structures [ 20,21 ] or induce chemical reactions in materials, for example, converting carbon‐based polymers to graphene. [ 22–27 ] Here we use a UV laser to create a sensor array from a polymeric multi‐layer stack. We first use low laser power to generate isolated piezoresistive 3D graphene pixels and then turn up the laser power to cut through the active and substrate layers and leave behind an interconnect pattern to connect individual pixels.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Crosstalk‐Free, High‐Resolution Pressure Sensor Arrays Enabled by High‐Throughput Laser Manufacturing

Long

Chen

et al. 2022

Advanced Materials

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Simultaneously achieving high spatial resolution and low crosstalk interference has been a fundamental challenge for flexible pressure sensor arrays. Here the authors present a high-resolution flexible pressure sensor array fabricated through a two-step laser manufacturing process, where individual sensing pixels and their interconnects are sequentially defined by laserinduced graphenization and ablation to minimize crosstalk interferences. The geometry of the interconnects is optimized through theoretical modeling and experimental validation. Characterization results show that the new device design induces a remarkable reduction of the crosstalk coefficient, from −8.21 to −43.63 dB, of the 0.7 mm-resolution sensor arrays, and the crosstalk suppression is particularly beneficial for application scenarios involving pressure sensing on soft surfaces (e.g., human skin and organs). Applications of the sensor array in tactile pattern recognition and minimally-invasive cancer surgery are demonstrated.

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Enhanced Organic Solvent Nanofiltration Membranes with Double Permeance via Laser‐Induced Graphitization of Polybenzimidazole

Kim,

Khan,

et al. 2024

Adv Materials Inter

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This study investigates the fabrication of organic solvent nanofiltration (OSN) membranes through laser‐induced graphitization of polybenzimidazole (PBI). Employing a CO2 laser, the polymer is converted into graphene, resulting in controlled submicron‐scale porous 3D structures, a feat not achievable with traditional methods such as chemical crosslinking. The effectiveness of this process hinges on precise adjustments of laser parameters, such as fluence, to attain the ideal graphitization levels. The findings indicate that partial graphitization, as opposed to excessive, is crucial for preserving the membrane's microstructure and enhancing its functional properties. The partially graphitized PBI‐LIG (Polybenzimidazole ‒ Laser‐induced Graphene) membranes achieved up to 94% rejection of Congo red from ethanol, with an ethanol permeance rate of 12.14 LMH bar−1—nearly twice that of standard PBI membranes. Additionally, these membranes showcased outstanding chemical stability and solvent resistance, maintaining over 99% structural integrity and experiencing <1% weight loss after prolonged exposure to various industrial solvents over a week. These results highlight the potential of laser‐graphitized PBI membranes for applications in harsh chemical conditions, paving the way for further optimization of high‐performance OSN membranes. This research advances membrane technology, merging laser engineering with materials science, and contributes to environmental sustainability and industrial efficiency.

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Phosphoric acid involved laser induced microporous graphene via proton conducting polybenzimidazole for high-performance micro-supercapacitors

Cited by 20 publications

References 30 publications

Ultrasensitive Humidity Sensors with Synergy between Superhydrophilic Porous Carbon Electrodes and Phosphorus-Doped Dielectric Electrolyte

Ultrasensitive Humidity Sensors with Synergy between Superhydrophilic Porous Carbon Electrodes and Phosphorus-Doped Dielectric Electrolyte

Crosstalk‐Free, High‐Resolution Pressure Sensor Arrays Enabled by High‐Throughput Laser Manufacturing

Enhanced Organic Solvent Nanofiltration Membranes with Double Permeance via Laser‐Induced Graphitization of Polybenzimidazole

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