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Evaluation of trans-resveratrol level in grape wine using laser-induced porous graphene-based electrochemical sensor
摘要： trans-Resveratrol (TRA), is one of the indicators to evaluate the quality of red wines. In this study, a novel flexible electrochemical sensor using direct laser-induced graphene (LIG) technique that transforms the commercial Kapton tape into three-dimensional (3D) porous graphene was developed for sensitive detection of TRA molecules in red wines. For the first time, the strategy of ‘double layer’ (Kapton/polyimide) was employed to obtain the LIG with undamaged shape and excellent electrical properties. The mechanism of heat absorption and dissipation of laser-induced process was investigated in detail. The prepared electrochemical sensor with excellent repeatability, stability, reproducibility, and reliability, appears an excellent linear response within the TRA concentration range from 0.2 to 50 μmol L?1 and a low limit of detection (LOD) of 0.16 μmol L?1. Furthermore, the developed sensor can be applied for the evaluation of TRA level in red wines and grape skins with a satisfactory result. The sensor may be potential in analysis of active compounds in food or environmental samples.
关键词： trans-Resveratrol,Electrochemical sensor,Red wines,Laser-induced graphene
更新于2025-09-16 10:30:52
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Ion Transport in Laser-Induced Graphene Cation-Exchange Membrane Hybrids
摘要： Ion exchange membranes hybridized with laser-induced graphene (LIG) might lead to membranes with functional surface effects such as antifouling, antibacterial or joule heating, however, understanding the change in the electrical properties of the membrane is essential. Here we studied LIG-modified ion-exchange polymeric membranes using electrochemical impedance spectroscopy (EIS). The conductivity of the anionic sulfonated polyethersulfone membranes and the effective capacitance of the membrane-electrolyte interface were obtained by fitting the EIS spectra to an electrochemical equivalent circuit and compared to LIG-modified non-ionic polyethersulfone films. The transport selectivity (as relative permeability) of counter-ions (K+, Na+, Mg2+, Ca2+) across the membrane was quantified using the membrane’s conductivities obtained from the EIS measurements. The total ohmic resistance of the membrane was directly correlated to the polymer thickness, (with negligible contribution from the conductive LIG layer), thereby establishing EIS as a rapid, low-cost and non-invasive method to accurately probe substrate usage in LIG modification.
关键词： laser-induced graphene,electrochemical impedance spectroscopy,capacitance,ion exchange membranes,conductivity,ion transport
更新于2025-09-16 10:30:52
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Attachable micropseudocapacitors using highly swollen laser-induced-graphene electrodes
摘要： For powering wearable electronics, extensive research has been directed toward microscale flexible and stretchable energy-storage devices. Microsupercapacitors, though promising candidates, remain limited in terms of design flexibility, scalability, reusability, and compatibility with general substrates. This paper reports a high-performance sticker-type flexible microsupercapacitor using highly swollen reduced-graphene-oxide electrodes fabricated by an ultrashort-pulse laser to promote full active-site and durability of the electrodes. Our sticker-type flexible micropseudocapacitor provides a comparable volumetric energy density of 1.08 mWh cm-3 and 13 times higher volumetric power density of 83.5 mW cm-3 compared to conventional lithium thin-film batteries. Bio-inspired surface modifications are additionally applied to the reduced-graphene-oxide electrodes, which provides a six-fold increase (10.38 mF cm?2) of the areal capacitance. A 6 × 2 micropseudocapacitor array embedded in a sub-millimeter thin PDMS film adheres to safety goggles and successfully powers a μ-LED. The total capacitance of the array is maintained at ~97% of its original value after 200 repetitive attachments and detachments showing good durability. In addition, the sticker-type micropseudocapacitor array shows a stable performance under repeated deformation, and up to ~99% of capacitance retention after 200 bending cycles. This novel re-attachable flexible micropseudocapacitor will expedite the widespread use of flexible and wearable devices.
关键词： laser direct writing,attachable energy storage device,laser-induced graphene,pseudocapacitor,microsupercapacitor
更新于2025-09-12 10:27:22
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Tailoring the surface morphology and nanoparticle distribution of laser-induced graphene/Co3O4 for high-performance flexible microsupercapacitors
摘要： Recent trends have witnessed laser induced graphene (LIG) syntheses on various materials from synthetic polymers to natural precursors. Herein, porcine skin derived gelatin was used as a medium to modify the surface morphology and nanoparticle distribution of in situ synthesized Co3O4/LIG on polyimide (PI) film. By varying the applied laser fluence, the surface morphology of LIG transitions from a 3D porous structure to a multilayered structure, Co3O4 progressively distributes from the surface to the inside of the LIG structure, and the structure changes from a sphere to a whisker-like shape. These altered attributes contribute to distinct differences in the double layer capacitance and pseudocapacitance behaviors of Co3O4/LIG, as reflected in its associated electrochemical performance. Additionally, a facile fabrication strategy including simple casting and peeling steps was used to generate stretchable microsupercapacitors (MSCs) on a waterborne polyurethane (WPU) substrate. The as-prepared stretchable MSCs present outstanding areal capacitance and excellent mechanical flexibility, whereas their electrochemical differences are significantly minimized and dominated by their inner structures.
关键词： Co3O4,morphology transition,supercapacitor,laser-induced graphene,gelatin
更新于2025-09-12 10:27:22
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Radio Frequency Heating of Laser-Induced Graphene on Polymer Surfaces for Rapid Welding
摘要： In this report, we investigate the rapid heating ability of laser-induced graphene (LIG) in response to radio frequency (RF) fields. Graphitic structures were produced from various industrially prevalent thermoplastics via laser irradiation of the polymer surface. We find that RF responsive, graphitic structures may be produced from Kapton, polyether imide (PEI), polyether sulfone (PESU), polyether ether ketone (PEEK), and polycarbonate (PC) using a conventional laser cutting machine. The graphitic structures are also electrically conductive in addition to being RF responsive. Exposure of LIG to RF fields resulted in the rapid heating of LIG with remarkable heating rates up to 126 °C/s. Finite-element simulations for these systems show similar heating trends. This heating response may be used in advanced manufacturing as a means to rapidly weld polymer-polymer interfaces, as will be demonstrated in this report. Our technique uses RF fields to induce localized heating in contrast to uniform bulk heating from external sources such as ovens or furnaces. The methods detailed below provide a polymer processing pathway that may be used to generate RF responsive filler in situ. Finally, we aim to show that LIG-polymer composites may function in an industrial setting, with particular application to additive manufacturing and functional coatings.
关键词： thermoplastic,RF heating,welding,nanomaterials,Laser-induced graphene
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Seoul, Korea (South) (2019.1.27-2019.1.31)] 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Laser-Induced Graphene Stamp for High Performacne Elecrochemical Sensing Applications
摘要： Here, we newly proposed laser-induced graphene (LIG) stamp to transfer directly it onto Au substrate from polyimide (PI) substrate. The stamped-LIG was strongly adhered by van der waals force with Au. Unlike conventional transferred LIG electrode composed of totally carbon-based material, the proposed LIG stamp was formed with several layers of carbon on top of highly conductive Au electrode resulting in the improvement electrical and electrochemical properties. In addition, we successfully electrodeposited Pt nanoparticles (PtNPs) as catalytic material on the surface of the stamped LIG for electrochemical biosensor applications, which also resulted in highly improved redox characteristics. We characterized and compared various materials such as Au, Au/PtNPs, Au/stamped-LIG, and Au/stamped-LIG/PtNPs through cyclic voltammetry and amperometric measurement. As a result, the electrical and electrochemical redox properties were much improved. Through amperometric measurement, the developed electrochemical sensor electrode indicated 69.33 μA/mM·cm2 of the sensitivity at hydrogen peroxide concentration of 10 to 3760 μM and limit of detection of 2.2 μM, respectively.
关键词： Pt nanoparticles,electrochemical sensing,biosensor,hydrogen peroxide,laser-induced graphene
更新于2025-09-12 10:27:22
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Laser induced flexible graphene electrodes for electrochemical sensing of hydrazine
摘要： In this work, electrochemical sensing of hydrazine is reported using laser induced flexible graphene as the sensing electrode. The electrodes were fabricated by simple lasing and patterning of polyimide films at ambient conditions. Cyclic voltammetry technique was used for electrochemical sensing of hydrazine. These sensors exhibited linear response to change in concentration of hydrazine. The sensor had a sensitivity of up to115 % at 0.5 mM hydrazine, limit of detection of 70 μM, and was reliable after 500 bending cycles. Overall, the hydrazine sensor exhibited good reproducibility, sensitivity, selectivity, lifetime, and is promising for developing low cost flexible hydrazine sensor.
关键词： Laser induced graphene,Carbon materials,Sensors,Hydrazine
更新于2025-09-12 10:27:22
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Fabrication of Smart Components by 3D Printing and Laser-scribing Technologies
摘要： Smart 3D printed structural components with self-monitoring ability show potential applications in some extreme environments, such as deep-water and space. Fused deposition modeling (FDM) supplies a feasible solution, however, it is still a big challenge to print structural components with high bending and stretching mechanical properties due to the weak interlayer bonding and the pores. Here, a low-cost and facile fabrication strategy of smart components combining FDM with laser-scribing technology is reported. Thin laser-induced graphene (LIG) layer (< 50 μm) can serve as the active materials of sensors, which can be obtained on the printed PEEK components. Accordingly, the PEEK-LIG smart components (PEEK-LIG SCs) can self-monitor the working process and the deformations (bidirectional bending and stretching) in real-time with high sensitivity. For instance, the gauge factor of PEEK-LIG SCs for bending outward and stretching are up to 155.36 and 212.35 (2%-5% strain), respectively. Besides, the PEEK-LIG SCs possess good reliability (> 1000 cycles), fast response time (60 ms) and recovery time (247 ms). We further show the excellent performance of PEEK-LIG smart gear in monitoring the rotation and the abrasion, indicating the wide potential applications of this strategy.
关键词： PEEK,3D printing,smart components,laser-induced graphene,sensors
更新于2025-09-12 10:27:22
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Graphene oxide on laser-induced graphene filters for antifouling, electrically conductive ultrafiltration membranes
摘要： Laser-induced graphene (LIG) is a three-dimensional porous carbon material prepared by direct laser writing with a CO2 laser on various polymers in an ambient atmosphere, leading to electrically conductive, low fouling coatings. Recently, LIG has been synthesized on porous supports, which led to highly permeable and porous separation filters and LIG composites have greatly improved the stability. On the other hand, graphene oxide (GO) has emerged as a promising 2D nanomaterial to coat porous or non-porous polymer membrane supports resulting in separation membranes with enhanced separation and surface properties. Here, we report a robust, hybrid LIG-GO membrane fabricated by filtration and crosslinking of GO onto the LIG membrane support, generating ultrafiltration membranes with tailored performance. Increasing the amount of crosslinked GO on the LIG surface resulted in increased rejection of bovine serum albumin (BSA) up to 69%, and bacterial rejection was increased from 20 to 99.9%, which agreed with the measured molecular weight cut-off determination that approached ~ 90 kDa as the GO content increased. Higher flux recovery ratios and lower BSA adsorption were seen with LIG-GO membranes, and the hybrid membranes showed comparatively good antifouling. These composite membranes showed 83% less biofilm growth compared to a typical polymer ultrafiltration membrane under non-filtration condition. Noteworthy is that the LIG supporting layer maintained its electrical conductivity and the LIG-GO membrane used as electrodes showed complete elimination of bacterial viability with potent antimicrobial killing effects when treated with mixed bacterial culture. In cross-flow filtration, LIG-GO membranes with 3V anodic electric field showed 11% improvement of flux as compared to typical polymer ultrafiltration membrane. The LIG-GO membranes expand possibilities for the use of LIG in membrane separation applications, especially ultrafiltration.
关键词： Biofilm,Graphene oxide,Nano-materials,Ultrafiltration,Laser-induced graphene
更新于2025-09-11 14:15:04
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Simultaneous densification and nitrogen doping of laser-induced graphene by duplicated pyrolysis for supercapacitor applications
摘要： Laser pyrolysis of polyimide is a facile and cost-effective method to fabricate high performance supercapacitor electrodes. This study proposes a duplicated laser pyrolysis method to densify pyrolyzed carbon electrodes and hence improve electrochemical performance. The initial laser pyrolysis of polyimide generates a graphene-like carbon, called laser-induced graphene (LIG). This LIG is then coated with an additional polyimide layer, and the second laser pyrolysis is applied, producing densified LIG. Laser power effects on densified LIG morphology and electrochemical characteristics are investigated, confirming remarkable density increase. Increased nitrogen content is also observed, signifying significant nitrogen doping. The densified electrode achieves 49.0 mF cm?2 specific capacitance at 0.2 mA cm?2 current density in a standard three-electrode system, approximately 6-fold that for singly pyrolyzed LIG electrodes. A solid-state flexible supercapacitor with densified LIG electrodes is fabricated using a gel electrolyte (PVA-H2SO4), achieving 19.8 mF cm?2 capacitance at 0.05 mA cm?2 current density, with outstanding cyclic charge-discharge stability and mechanical flexibility.
关键词： Nitrogen-doped carbon,Laser pyrolysis,Densification,Laser-induced graphene,Flexible supercapacitors
更新于2025-09-11 14:15:04