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Low-Cost and Easily Manufactured Flexible All-Solid-State Supercapacitors Based on Laser-Induced Graphene 17

Low-Cost and Easily Manufactured Flexible All-Solid-State Su...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Lu, Tianqi Adiraju, Anurag Li, Yinting Mo, Haoran Wu, Zhenyu Kanoun, Olfa Professorship of Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9798331507626

Supercapacitors (SCs) are critical energy storage devices that bridge the gap between traditional capacitors and batteries, offering high power density, rapid charge-discharge cycles, and long operational lifespans. As the demand for flexible and wearable electronics continues to grow, the development of low-cost, easily manufacturable, and high-performance supercapacitors has become increasingly important. This paper presents the development and characterization of a flexible supercapacitor based on laser-induced graphene (LIG). The LIG interdigital electrodes were fabricated on polyimide film using UV laser technology, while a PVA H2 SO4 polymer electrolyte was prepared and applied to the electrodes. The electrochemical performance of the supercapacitors (LIG-SCs) was evaluated through cyclic voltammetry and galvanostatic charge-discharge tests. The study examined the influence of key fabrication parameters, such as vacuum drying time and electrolyte volume, on areal capacitance, and further explored the device's performance under mechanical bending. The LIGSCs demonstrated a maximum areal capacitance of 13.27 mF cm2, retaining 39.03% of the initial capacitance at a higher current density of 0.5 mA cm2. Furthermore, the supercapacitors exhibited exceptional stability under mechanical deformation, with an RSD of 2.81%, indicating minimal variation in electrochemical performance across different bending angles. After 1000 charge-discharge cycles, the capacitance retention increased to 1 0 3. 5%, suggesting enhanced cycling stability. Additionally, the reproducibility of the fabrication process was validated, as the areal capacitance of multiple LIG-SC samples ranged with an RSD of only 0. 9 6%. The results demonstrate the high reliability and scalability of the LIG-SC fabrication process, making it a promising approach for cost-effective, flexible supercapacitors suitable for wearable electronics and energy storage applications. © 2024 IEEE.

关键词： Cyclic voltammetry

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Portable Metal Oxide E-Nose Based on Machine Learning for Multiple Beverage Classification 17

Portable Metal Oxide E-Nose Based on Machine Learning for Mu...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Lu, Tianqi Shi, Ge Own, Arwa Qu, Yunze Li, Yinting Adiraju, Anurag Kanoun, Olfa Professorship of Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9798331507626

Beverage quality control is crucial for ensuring consumer safety, product authenticity, and market integrity. Traditional methods such as high-performance liquid chromatography and mass spectrometry are effective but present limitations in terms of cost, complexity, and time efficiency. In this study, we propose an electronic nose (E-nose) platform, combined with a linear discriminant analysis (LDA) algorithm, as a novel approach for beverage classification. The E-nose system, comprising a gas sensor array, was evaluated using multiple beverage samples, including alcoholic beverages, coffee, tea, and soft drinks. Key features were extracted from the sensor responses, and classification tasks were performed using machine learning techniques. Our results demonstrate that the LDA classifier achieves a high inter-class classification accuracy, with an AUC of 1. 0 0 for most beverage categories. However, intra-class classification, particularly among alcoholic beverages, remains challenging, with AUC values dropping to 0.64 for rosé wine. While the overall intra-class accuracy was 87.5%, further optimization is needed to improve discrimination between beverages with similar volatile profiles. These findings highlight the potential of E-nose technology for rapid, cost-effective beverage quality control, with opportunities for future enhancements through advanced sensor arrays and machine learning models. © 2024 IEEE.

关键词： Alcoholic beverages

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Plasma-Treated Polyimide Film Modified by Liquid Epitaxially Grown HKUST-1 MOFs for Sensing Application 17

Plasma-Treated Polyimide Film Modified by Liquid Epitaxially...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Otay, Oumayma Mrayeh, Amir Shi, Ge Lu, Tianqi Adiraju, Anurag Bizid, Salma Kanoun, Olfa Said, Ayoub Haj Center for Research on Microelectronics and Nanotechnology Sousse Tunisia Chemnitz University of Technology Professorship of Measurement and Sensor Technology Chemnitz Germany

ISBN: (纸本)9798331507626

Metal-organic framework (MOFs) materials have the potential to be used in electrochemical sensors thanks to their porous nature, high surface area, and periodic lattice structures. However, the insulating nature of pristine MOFs is one of the drawbacks that limit their applicability in electrochemical sensors. Several works have proposed their integration with carbon nanomaterials to enhance the conductivity. On the other hand, Laser-induced graphene (LIG) is a one-step method to fabricate conductive graphene-based electrodes on flexible substrates such as Kapton. In this regard, this research proposes a novel methodology to fabricate surface-mounted MOFs (SURMOF) and LIG-based composite electrodes on Kapton. The Kapton sheet is modified with HKUST-1 MOF by alternative immersions in precursor solutions to achieve layer-by-layer (LbL) deposition and growth. Hence, Kapton is pre-treated with plasma to enhance the hydrophilicity by introducing oxygen functional groups on the surface which was confirmed with contact angle measurements. Different precursor materials were investigated for the LBL growth of HKUST-1. The obtained SURMOF on Kapton was characterized by spectroscopic methods. Finally, UV laser interaction with HKUST-1-modified Kapton led to the formation of LIG. The electrochemical performance of LIG on modified Kapton was compared with bare LIG. The proposed methodology is promising to realize flexible, easy-to-fabricate LIG-MOF'S electrodes for electrochemical sensors. © 2024 IEEE.

关键词： Ultraviolet lasers

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Chemically Treated Polyimide Film Modified by Liquid Phase Epitaxially Grown HKUST-1 MOFs for Electrochemical Sensing Applications 17

Chemically Treated Polyimide Film Modified by Liquid Phase E...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Mrayeh, Amir Otay, Oumayma Shi, Ge Lu, Tianqi Adiraju, Anurag Bizid, Salma Kanoun, Olfa Said, Ayoub Haj Center for Research on Microelectronics and Nanotechnology Sousse Tunisia Professorship of Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9798331507626

The development of flexible and high-performance electrochemical sensors is essential for applications in fields such as environmental monitoring, healthcare, and wearable electronics. Conventional electrode materials often face limitations in flexibility, surface area, and conductivity, making it necessary to explore innovative materials and fabrication techniques. In this work, we present a novel strategy to enhance EC sensor performance by combining the layer-by-layer growth of HKUST-1 metal-organic frameworks (MOFs) with laserinduced graphene (LIG) on a flexible Kapton substrate. The LBL method was employed to grow uniform HKUST-1 MOF films on chemically treated Kapton, followed by the LIG process to convert the MOFs into a conductive graphene structure, with uniformly distributed metal oxide nanoparticles. This approach resulted in flexible electrodes with increased surface area and improved charge transfer properties. Cyclic voltammetry measurements demonstrated a significant enhancement in the electrochemical performance of the HKUST-1 modified Kapton electrodes compared to untreated Kapton, particularly in the higher voltage range. The results indicate that this hybrid fabrication method effectively addresses the challenges of electrode flexibility and conductivity while improving sensor sensitivity. The integration of MOFs with LIG provides a scalable and efficient approach for creating advanced flexible electrodes that hold great potential for the development of nextgeneration EC sensors. © 2024 IEEE.

关键词： Cyclic voltammetry

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FINITE ELEMENT METHOD BASED INVESTIGATION OF SUBSTRATES EFFEKT ON SURFACE-ENHANCED RAMAN SPECTROSCOPY 9

FINITE ELEMENT METHOD BASED INVESTIGATION OF SUBSTRATES EFFE...

引用

9th EnvIMEKO Symposium of Environmental Instrumentation and measurements, EnvIMEKO 2022

作者： Adiraju, Anurag Al-Hamry, Ammar Kanoun, Olfa Professorship of Measurement and sensor technology Chemnitz University of Technology Chemnitz Germany Professorship of Measurement and sensor technology Chemnitz University of Technology Germany

ISBN: (纸本)9789299009031

Surface-enhanced Raman spectroscopy (SERS) is a widely used method for the detection of molecules of environmental concern such as pesticides. One of the key factors to achieve high sensitivity in SERS is the high electromagnetic enhancement formed between plasmonic nanoparticles which is dependent on the wavelength used, shape, size, distance, and type of nanoparticles. In this regard, the scope of this paper is to investigate the enhancement factor achieved between adjacent silver or gold nanoparticles of different geometrical configurations by changing the shapes and sizes of the particles. Simulations based on finite element methods (FEM) were carried out to investigate the effect of different excitation laser wavelengths. The obtained results show the dependency of the enhancement factor, size, type of nanoparticles, excitation wavelength of the laser, dielectric properties of the surrounding medium and the type of substrate used. © 2022 9th EnvIMEKO Symposium of Environmental Instrumentation and measurements, EnvIMEKO 2022. All Rights Reserved.

关键词： Finite element method

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Transmissive Eddy Current sensor for Gap Detection Between Sheet Metal Materials 19

Transmissive Eddy Current Sensor for Gap Detection Between S...

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19th IEEE International Multi-Conference on Systems, Signals and Devices, SSD 2022

作者： Hu, Zheng Wendler, Frank Kanoun, Olfa Chemnitz University of Technology Professorship of Measurement and Sensor Technology Chemnitz Germany

ISBN: (数字)9781665471084

ISBN: (纸本)9781665471084

Path control is decisive for the quality of welding processes. In this work, an eddy current sensor system based on double coils is investigated for gap detection between two sheet metal materials. The coupling inductances of the sending and the receiving coils are collected in the frequency range from 10 kHz to 1 MHz, in cases of different gap widths and measurement distances. The experimental results show that the developed system is able to measure gaps with a width from 0 mm to 12 mm at various distances from 3 mm to 6 mm. This method is therefore suitable for precise location in welding processes, especially in the plasma welding process facing great noisy disruptions. © 2022 IEEE.

关键词： Inductance

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A mononuclear nickel(II) complex as a redox mediator for electrochemical sensors 19

A mononuclear nickel(II) complex as a redox mediator for ele...

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19th IEEE International Multi-Conference on Systems, Signals and Devices, SSD 2022

作者： Weheabby, Saddam Al-Hamry, Ammar Nasraoui, Salem Ruffer, Tobias Kanoun, Olfa Technische Universität Chemnitz Professorship of Measurement and Sensor Technology Chemnitz Germany

ISBN: (数字)9781665471084

ISBN: (纸本)9781665471084

The mononuclear nickel bis oxamidato) complex [(mathbf{L})mathbf{Ni}]{2-};mathbf{L}=o-mathbf{phenylenebis} (N-ethyloxalamide) has a potential for use in electrochemical sensors. The [(mathbf{L})mathbf{Ni}]{2-} complex was characterized by, for example, UV-vis spectroscopy, and its redox properties were studied by cyclic voltammetry. [(mathbf{L})mathbf{Ni}]{2}. shows a reversible redox event corresponding to the mathbf{Ni}{text{II}}/text{Ni}{mathbf{III}} redox couple at boldsymbol{E}{o{prime}}=360 mathbf{mV}(Delta boldsymbol{E}{mathrm{p}}=60 mathbf{mV}). To study the electrochemical sensitivity a screen-printed carbon electrode (SPCE) was used and functionalized with [(L)Ni]2-. The modified electrode [(mathbf{L})mathbf{Ni}]{2-}@SPCE has been fabricated by drop-casting of [(mathbf{L})mathbf{Ni}]{2-} on the working electrode. The [(mathbf{L})mathbf{Ni}]{2}-{@}mathbf{SPCE} electrode exhibits the characteristic of improved reversibility and enhances the current response of ferri/ferrocyanide redox couple compared to SPCE. Furthermore, the modified electrode shows a good electrocatalytic activity toward the oxidation of D-glucose and the reduction of nitrate, providing means as a new and promising electrochemical sensors material. © 2022 IEEE.

关键词： Cyclic voltammetry

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Low-Cost and Easily Manufactured Flexible All-Solid-State Supercapacitors Based on Laser-Induced Graphene

Low-Cost and Easily Manufactured Flexible All-Solid-State Su...

引用

Impedance Spectroscopy (IWIS), International Workshop on

作者： Tianqi Lu Anurag Adiraju Yinting Li Haoran Mo Zhenyu Wu Olfa Kanoun Professorship of Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (数字)9798331507626

ISBN: (纸本)9798331507633

Supercapacitors (SCs) are critical energy storage devices that bridge the gap between traditional capacitors and batteries, offering high power density, rapid charge-discharge cycles, and long operational lifespans. As the demand for flexible and wearable electronics continues to grow, the development of low-cost, easily manufacturable, and high-performance supercapacitors has become increasingly important. This paper presents the development and characterization of a flexible supercapacitor based on laser-induced graphene (LIG). The LIG interdigital electrodes were fabricated on polyimide film using UV laser technology, while a $\text{PVA} / \text{H}_{2} \text{SO}_{4}$ polymer electrolyte was prepared and applied to the electrodes. The electrochemical performance of the supercapacitors (LIG-SCs) was evaluated through cyclic voltammetry and galvanostatic charge-discharge tests. The study examined the influence of key fabrication parameters, such as vacuum drying time and electrolyte volume, on areal capacitance, and further explored the device's performance under mechanical bending. The LIGSCs demonstrated a maximum areal capacitance of 13.27 $\text{mF} / \text{cm}^{2}$ , retaining $\mathbf{3 9. 0 3 \%}$ of the initial capacitance at a higher current density of $0.5 \ \text{mA} / \text{cm}^{2}$ . Furthermore, the supercapacitors exhibited exceptional stability under mechanical deformation, with an RSD of $\mathbf{2. 8 1 \%}$ , indicating minimal variation in electrochemical performance across different bending angles. After 1000 charge-discharge cycles, the capacitance retention increased to $\mathbf{1 0 3. 5 \%}$ , suggesting enhanced cycling stability. Additionally, the reproducibility of the fabrication process was validated, as the areal capacitance of multiple LIG-SC samples ranged with an RSD of only $\mathbf{0. 9 6 \%}$ . The results demonstrate the high reliability and scalability of the LIG-SC fabrication process, making it a promising approach for cost-eff

关键词： Fabrication Performance evaluation Graphene Supercapacitors Bending Laser stability Capacitance Reproducibility of results Reliability Wearable devices

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Portable Metal Oxide E-Nose Based on Machine Learning for Multiple Beverage Classification

Portable Metal Oxide E-Nose Based on Machine Learning for Mu...

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Impedance Spectroscopy (IWIS), International Workshop on

作者： Tianqi Lu Ge Shi Arwa Own Yunze Qu Yinting Li Anurag Adiraju Olfa Kanoun Professorship of Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (数字)9798331507626

ISBN: (纸本)9798331507633

Beverage quality control is crucial for ensuring consumer safety, product authenticity, and market integrity. Traditional methods such as high-performance liquid chromatography and mass spectrometry are effective but present limitations in terms of cost, complexity, and time efficiency. In this study, we propose an electronic nose (E-nose) platform, combined with a linear discriminant analysis (LDA) algorithm, as a novel approach for beverage classification. The E-nose system, comprising a gas sensor array, was evaluated using multiple beverage samples, including alcoholic beverages, coffee, tea, and soft drinks. Key features were extracted from the sensor responses, and classification tasks were performed using machine learning techniques. Our results demonstrate that the LDA classifier achieves a high inter-class classification accuracy, with an AUC of $\mathbf{1. 0 0}$ for most beverage categories. However, intra-class classification, particularly among alcoholic beverages, remains challenging, with AUC values dropping to 0.64 for rosé wine. While the overall intra-class accuracy was $87.5 \%$ , further optimization is needed to improve discrimination between beverages with similar volatile profiles. These findings highlight the potential of E-nose technology for rapid, cost-effective beverage quality control, with opportunities for future enhancements through advanced sensor arrays and machine learning models.

关键词： Accuracy Machine learning algorithms Machine learning Quality control Alcoholic beverages Electronic noses Linear discriminant analysis Optimization Gas detectors sensor arrays

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Generalization of Reflection Modeling in Complex Cable Structure with Impedance Mismatches 17

Generalization of Reflection Modeling in Complex Cable Struc...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Haddad, Dhia Ben Amara, Najoua Essoukri Kanoun, Olfa Technische Universität Chemnitz Professorship Measurement and Sensor Technology Chemnitz Germany Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS- Laboratory of Advanced Technology and Intelligent Systems Sousse4023 Tunisia

ISBN: (纸本)9798331507626

Cable networks are essential in modern systems, but they can develop defects due to environmental factors or wear, leading to signal degradation or reduced performance. These defects cause signal reflections in transmission lines due to impedance mismatches, either within the cables or between the cables and their port loads. Such reflections can result from junctions, soft faults (partial impedance changes), or hard faults, i.e., open or short circuits. Diagnosing these faults, especially using Time-Domain Reflectometry (TDR), requires accurately modeling how impedance mismatches affect signal reflections. This paper presents a model that takes a comprehensive approach to addressing various sources of impedance mismatches. It covers junctions, soft and hard faults, and mismatches between cables and connected devices. The model's thoroughness is evident in its ability to handle complex scenarios such as heterogeneous junctions, soft faults, multi-path reflections, input port reflections, and multi-load reflections. Additionally, it evaluates signal reflection measurability based on the components of the propagation path, further enhancing its robustness. The model's accuracy is validated through simulations using the distributed RLCG cable model, comparing predicted reflection values with simulated signals. The results show strong agreement, confirming the model's effectiveness in diagnosing faults in complex cable networks. This should instill confidence in the model's practical application, as it accurately correlates signal reflections with specific defects, paving the way for efficient fault diagnosis. © 2024 IEEE.

关键词： Reflectometers

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