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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Rajendran, Dhivakar Keutel, Thomas Kanoun, Olfa Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9798331507626

Polymer characterization is essential for understanding the physical, chemical, and electrical properties of materials, which directly influence their performance in various applications. Accurate characterization ensures quality control, material optimization, and suitability for specific industrial applications, including electronics, automotive sector, and coatings. This paper presents a novel approach to polymer characterization utilizing rectangular patch antennas, exploiting the sensitivity of microwave frequencies to the dielectric properties of polymer materials. Patch antennas operating in the GHz range are designed to measure shifts in resonance frequency and bandwidth when a polymer sample is placed in proximity to the antenna. These shifts provide valuable insight into the electromagnetic properties of the polymer, as they correspond to changes in the effective dielectric constant and loss tangent of the polymer. The proposed patch antenna is applicable for sensing the relative permittivity (varepsilonr) in the range 2-10, with a change in resonant frequency of 0.45% of the initial resonant frequency. © 2024 IEEE.

关键词： Slot antennas

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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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Comparative Analysis of Embedded AI Techniques for Bovine Meat Monitoring 17

Comparative Analysis of Embedded AI Techniques for Bovine Me...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Narale, Varsha Sadashiv Stein, Samuel Denisov, Nikita Kallel, Ahmed Yahia Mnif, Mahdi Guermazi, Mahdi Kanoun, Olfa Measurement and Sensor Technology Chemnitz University of Technology Chemnitz09126 Germany

ISBN: (纸本)9798331507626

To prevent foodborne illnesses resulting from the consumption of spoiled meat, it is essential to ensure the freshness of the meat in question. Consequently, impedance spectroscopy can be employed to achieve this objective. Nevertheless, in order to ensure the necessary portability, it is essential to incorporate sophisticated analytical techniques into the embedded system. This paper presents a comparative analysis of embedded artificial intelligence (AI) techniques for bovine meat monitoring. We implement and evaluate three machine learning algorithmsneural networks (NN), support vector machines (SVM), and decision trees on two embedded platforms: Coral and Arduino. The results demonstrate high classification accuracies, with a neural network achieving 99.47% on the Coral platform and a support vector machine reaching 9 9. 5% on the Arduino platform when processing augmented impedance data across four meat classes based on their freshness. The trade-offs between accuracy, speed, and memory usage across different combinations of AI models and hardware platforms are discussed, providing insights for optimal embedded AI solutions in meat quality assessment. © 2024 IEEE.

关键词： Support vector machines

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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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Adaptive-optical 3D microscopy for microfluidic multiphase flows

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Light(Advanced Manufacturing) 2024年第3期5卷 105-119页

作者： Clemens Bilsing Erik Nützenadel Sebastian Burgmann Jürgen Czarske Lars Büttner Laboratory of Measurement and Sensor System Techniques TUD Dresden University of Technology01069 DresdenGermany Chair of Fluid Mechanics Bergische Universitát Wuppertal42119 WuppertalGermany BIOLAS Laboratory of Measurement and Sensor System Techniques01069 DresdenGermany

measurements based on optical microscopy can be severely impaired if the access exhibits variations of the refractive *** the case of fluctuating liquid-gas boundaries,refraction introduces dynamical aberrations that increase the measurement *** is prevalent at multiphase flows(***,film flows)that occur in many technical applications as for example in coating and cleaning processes and the water management in fuel *** this paper,we present a novel approach based on adaptive optics for correcting the dynamical aberrations in real time and thus reducing the measurement *** shape of the fluctuating water-air interface is sampled with a reflecting light beam(Fresnel Guide Star)and a Hartmann-Shack sensor which makes it possible to correct its influence with a deformable mirror in a closed ***-dimensional flow measurements are achieved by using a double-helix point spread *** measure the flow inside a sessile,oscillating 50-μl droplet on an opaque gas diffusion layer for fuel cells and show that the temporally varying refraction at the droplet surface causes a systematic underestimation of the flow field magnitude corresponding to the first droplet eigenmode which plays a major role in their detachment *** demonstrate that the adaptive optics correction is able to reduce this systematic ***,the adaptive optics system can pave the way to a deeper understanding of water droplet formation and detachment which can help to improve the efficiency of fuels cells.

关键词： Double-Helix point spread function Adaptive optics Particle tracking velocimetry Aberration correction Depth-resolving microscopy Closed-loop control

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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...

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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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Design of a Thermal Battery Dummy with Integrated sensor Node 32

Design of a Thermal Battery Dummy with Integrated Sensor Nod...

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32nd IEEE International Symposium on Industrial Electronics, ISIE 2023

作者： Grubmuller, Michael Schweighofer, Bernhard Wegleiter, Hannes Graz University of Technology Institute of Electrical Measurement and Sensor Systems Graz Austria

ISBN: (纸本)9798350399714

High-performance Li-ion battery systems require sophisticated thermal management to ensure safe operation and long battery life. Testing such thermal management systems comes with some disadvantages and safety concerns. For this reason, the use of thermal battery dummies is advantageous. In this work, we present the design of a thermal battery dummy with 26650 cylindrical cell geometry with an integrated sensor node. The control of the heating power and the temperature measurement is done inside the dummy cell. Power supply and communication with a test bench computer are done through the supply lines. Thus, the only cell connections are the battery terminals, resulting in a dummy cell with geometric characteristics equivalent to a real Li-ion cylindrical cell. This and an addressing-based communication protocol allows parallel operation of multiple battery dummies in a dummy pack compound. The design of the thermal parameters is based on preceding thermal measurements on a real battery cell;in the following we explain the concept of the thermal dummy and go into more detail on the main electronic circuits. With final measurements on a prototype we show the achieved properties of the thermal dummy. © 2023 IEEE.

关键词： sensor nodes

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Functionalization of an Inner Surface of 3D Selfassembled sensor-In-A-Tube for Cytokines Detection 17

Functionalization of an Inner Surface of 3D Selfassembled Se...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Alnaimi, Aseel Egunov, Aleksandr I. Karnaushenko, Daniil Schmidt, Oliver Kanoun, Olfa Chemnitz University of Technology Measurement and Sensor Technology Chemnitz Germany Chemnitz University of Technology Research Center for Materials Architectures and Integration of Nanomembranes Chemnitz Germany

ISBN: (纸本)9798331507626

Optimization of Electrical impedance spectroscopy (EIS) biosensor performance plays a crucial role in developing modern Point-of-care (POC) devices. The use of a 3D tubular configuration of sensing electrodes and their integration into microfluidic channels have been shown to increase sensor sensitivity. 3D tubular geometry better mimics complex microenvironments in biological systems, such as blood vessels and organ tissues. It efficiently separates and sorts of particles based on size and deformability, improving microscale fluid and reagent mixing. It is, however, a challenging task to realize electrodes on the inner side of a tubular fluidic channel with conventional fabrication methods. Fortunately, in recent decades, the self-assembly of thin films into nonplanar architectures has matured, and various novel 3D microelectronic devices have been demonstrated. The main goal is to investigate the influence of the 3D tubular geometry of microelectrodes on EIS biosensor sensitivity. Prior to the realization of the cytokines (TNF-alpha, IL-6) biosensor, we will first focus on the functionalization of the inner surface of selfassembled structures, which is a non-trivial task. © 2024 IEEE.

关键词： Biosensors

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