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One-step electrosynthesized molecularly imprinted polymer on laser scribed graphene bisphenol a sensor
摘要： Bisphenol A (BPA) is a toxic chemical used by industries for production of containers for storage of food and beverages leading to possible health risks. In this work, we present a simple, mask-free, low-cost imprinted sensor based on laser scribed graphene (LSG) technology combined to molecularly imprinted polymers (MIPs) for BPA determination. CO2 laser was used in production of LSG electrodes with high resistivity 58 Ω/square on flexible polyimide sheet leading to the high active surface area of the sensor. LSG device was functionalized with imprinted polypyrrole with a known amount of BPA as template molecule to develop the sensor. The bare LSG, LSG-MIP, LSG-NIP sensors were characterized using Raman spectroscopy, SEM, XRD, AFM. The electrochemical measurements were carried out using cyclic voltammetry and differential pulse voltammetry. Experimental conditions were optimized, including the concentration of pyrrole monomer, the number of polymerization cycles, the concentration of BPA as template and the incubation time. We evaluated the sensitivity of the LSG-MIP sensor in the concentration range between 0.05 μM and 20 μM with a limit of detection of 8 nM. The proposed sensor exhibits high selectivity towards BPA compared to its structural analogs and good reusability. The developed sensor was successfully applied for the detection of BPA in tap, mineral water and in plastic samples. The developed sensor was integrated into a PMMA case connected to the potentiostat to achieve complete isolation and a practical measurement system.
关键词： Molecularly imprinted polymers,Water samples,Electropolymerization,Electrochemical devices,Bisphenol A,Laser scribed graphene
更新于2025-09-23 15:21:01
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A Hierarchical Three-Dimensional Porous Laser-Scribed Graphene Film for Suppressing Polysulfide Shuttling in Lithiuma??Sulfur Batteries
摘要： Lithium-sulfur (Li-S) battery is a promising next-generation rechargeable battery with high energy density. Given the outstanding capacities of sulfur (1675 mAh g?1) and lithium metal (3861 mAh g?1), Li-S battery theoretically delivers an ultra-high energy density of 2567 Wh kg?1. However, this energy density cannot be realized due to several factors, particularly the shuttling of polysulfide intermediates between the cathode and anode, which causes serious degradation of capacity and cycling stability of a Li-S battery. In this work, a simple and scalable route was employed to construct a free-standing laser scribed graphene (LSG) interlayer which effectively suppresses the polysulfide shuttling in Li-S batteries. Thus, a high specific capacity (1160 mAh g-1) with excellent cycling stability (80.4% capacity retention after 100 cycles) has been achieved due to the unique structure of hierarchical three-dimensional pores in the free-standing LSG.
关键词： High-capacity,Lithium-sulfur battery,Graphene,Polysulfide shuttling,Interlayer,Laser Scribed Graphene
更新于2025-09-19 17:13:59
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Binder- and conductive additive-free laser-induced graphene/LiNi1/3Mn1/3Co1/3O2 for advanced hybrid supercapacitors
摘要： Hybrid supercapacitors have recently emerged as next-generation energy storage devices that bridge the gap between supercapacitors and lithium-ion batteries. However, developing high energy cathodes that maintain long-term cycle stability and a high rate capability for real applications remains a significantly challenging issue. Herein, we report a facile synthesis method for a laser-scribed graphene/LiNi1/3Mn1/3Co1/3O2 (LSG/NMC) composite for high energy cathode materials for use in hybrid supercapacitors. LSG/NMC composites exhibit not only a high capacitance of up to 141.5 F/g but also an excellent capacitance retention of 98.1% after 1000 cycles at a high current density of 5.0 A/g. The introduction of an NMC spacer between the LSG layers provides an enlarged interspace that can act as an efficient channel for additional storage sites and rapid access. In addition, we further confirmed that hybrid supercapacitors using LSG/NMC cathodes and H2Ti2O25 anodes with an AlPO4/carbon hybrid coating layer (H-HTO) deliver a remarkable energy density of ~123.5 Wh/kg, power density of ~14074.8 W/kg, and a long-term cycle stability of 94.6% after 20,000 cycles. This work demonstrates that our proposed material can be considered a strong cathode candidate for next-generation hybrid supercapacitors.
关键词： laser-scribed graphene,high energy density,hybrid supercapacitors,LiNi1/3Mn1/3Co1/3O2,long-term cycle stability
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE Regional Symposium on Micro and Nanoelectronics (RSM) - Genting Highland, Pahang, Malaysia (2019.8.21-2019.8.23)] 2019 IEEE Regional Symposium on Micro and Nanoelectronics (RSM) - Synthesis of Laser Scribed Graphene Electrode with Optimized Power for Biosensing
摘要： Graphene is widely used in electronic devices due to its outstanding electrical properties. Although numerous synthesis methods have been reported, to produce a cost-effective graphene device is still a challenge until laser scribed graphene was introduced. This new technique is still in the development stage to be utilized in various application. In this work, we synthesized laser scribed graphene by manipulating the intensity of laser beam to study differences in morphology, structure and impedance. Field Emission Scanning Electron Microscopy images show that laser scribed graphene are highly porous when fabricated at higher power. Raman spectrum suggested higher degree of graphitization was produced by increasing the laser power and the intensity ratio ID/IG remained at 0.99 indicating the crystallinity is constant. Furthermore, the I2D/IG which is less than 1 supporting that graphene produced are multilayered. In addition, the impedance study also supported that higher resistivity was obtained at lower power.
关键词： biosensors,Laser scribed graphene,power
更新于2025-09-16 10:30:52
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[IEEE 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Berlin, Germany (2019.6.23-2019.6.27)] 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Highly Sensitive and Reliable Strain Sensor Based on MoS <sub/>2</sub> -Decorated Laser-Scribed Graphene for Wearable Electronics
摘要： We propose a strategy for the fabrication of a highly sensitive and reliable strain sensor based on MoS2-decorated laser-scribed graphene (MDS-LSG) for flexible and wearable electronics. The laser-thinning of multilayered MoS2 coated on commercial polyimide (PI) film using a CO2 infrared laser exhibits three-dimensional hierarchical porous graphene network decorated with MoS2 enabling superior electrical properties. By exploiting the advantage of high mobility of graphene and strain-dependent property of MoS2, the technique offers a rapid route towards a simple, facile and scalable approach for the fabrication of high-performance strain sensor. As fabricated sensor endows high sensitivity (gauge factor, GF ~290), wide working range, fast response time and stability over 7000 cycles. Finally, we successfully apply the sensor’s performance for subtle deformation of the skin (wrist pulse) and various human-motion detections.
关键词： subtle strain,laser scribing,MoS2-decorated laser-scribed graphene (MDS-LSG),strain sensor
更新于2025-09-12 10:27:22
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Surface Engineering of Laser-Scribed Graphene Sensor Enables Non-Enzymatic Glucose Detection in Human Body Fluids
摘要： Contemporary devices for glucose monitoring predominantly rely on finger-pricked blood through an enzyme-catalyzed reaction. However, the enzymes are highly expensive, unstable and require complex procedures for integration with the sensing matrix, rendering strategic replacement by non-enzymatic sensors. Here, a non-enzymatic glucose sensor is developed based on surface engineering of laser scribed graphene (LSG) - an immerging 3D patterned graphene - that combines binder-free, highly porous, conducting graphitic carbon network. An easy and green method is developed to engineer LSG surface by conformal anchoring of copper oxide nanoparticles (CuO NPs) of optimized NP size for enhancing its catalytic efficacy. The device shows excellent non-enzymatic glucose sensing performance (0.4 V detection potential vs. printed Ag/AgCl reference electrode, ? 0.2 s response time, 0.1 μM detection limit, 1 μM-5 mM linearity and high selectivity). Noteworthy, the device exhibits high stability and reproducibility for glucose in human body fluids (whole blood, serum, sweat, and urine). In addition, conformal transfer of LSG to commercial scotch tape (LSGST) enables wearability of the device on curvilinear body parts, exemplified through miniaturized devices monitoring glucose in sweat directly. These findings pave a new path for a comprehensive personalized healthcare strategy by accurate non-enzymatic detection of glucose from human body fluids.
关键词： Laser-scribed graphene,Miniaturized device,Glucose,Scotch tape,Non-enzymatic sensor
更新于2025-09-12 10:27:22
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Laser-Scribed Graphene Electrodes Derived from Lignin for Biochemical Sensing
摘要： Laser scribing of porous graphene electrodes on flexible substrates is of great interest for developing disposable electrochemical biosensors. In this work, we present a new patterning process for highly conductive nitrogen-doped graphene derived from a lignin-based precursor. A CO2 laser scribing process was performed under ambient conditions to produce the porous graphene electrodes from lignin. The obtained nitrogen-doped laser-scribed graphene (N-LSG) is binder-free, hierarchical, and conductive. The interconnected carbon network displayed enhanced electrochemical activity with improved heterogeneous electron transfer rate. These features can be attributed to the high-conductivity of porous N-LSG (down to 2.8 ? per square) and its enriched active edge plane sites. Furthermore, the N-LSG electrodes were decorated with MXene/Prussian Blue (Ti3C2Tx/PB) composite via a simple spray coating process, designed for sensitive detection of analytes. The Ti3C2Tx/PB modified N-LSG electrodes were functionalized with catalytic enzymes for detecting glucose, lactate, and alcohol. The enzyme/Ti3C2Tx/PB/N-LSG electrodes exhibited remarkably enhanced electrochemical activity toward the detection of these biomarkers, making them highly competitive with previously reported on-chip carbon-based biosensors. Therefore, our sensors demonstrate excellent potential for applications in personalized healthcare.
关键词： laser-scribed graphene,MXene,alcohol,lactate,glucose,lignosulfonate,biosensor,high conductivity
更新于2025-09-12 10:27:22