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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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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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Flywheel Energy Storage 1

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1000年

作者： Armin Buchroithner

ISBN: (数字)9783658353421

ISBN: (纸本)9783658353414

Storing energy is one of the most important challenges of our time. Energy storage systems are not only essential for switching to renewable energy sources, but also for all mobile applications. Electro-mechanical flywheel energy storage systems (FESS) can be used in hybrid vehicles as an alternative to chemical batteries or capacitors and have enormous development potential. In the first part of the book, the Supersystem Analysis, FESS is placed in a global context using a holistic approach. External influences such as the vehicle, driver and operating strategy, including socio-psychological aspects, are analyzed with regard to their interaction with the memory. From this, optimal application scenarios are derived and the development goals relevant for market success are defined. In the second part, the consideration of the subsystem, those critical components in the FESS are identified which are responsible for the achievement of the technical target properties. From the point of view of maximum cost reduction, specific solutions for the design of the key components are presented and their suitability is validated through empirical studies on the housing, bearing and rotor as well as through overall prototypes.;This book is a translation of the original German 1st edition Schwungradspeicher in der Fahrzeugtechnik by Armin Buchroithner published by Springer Fachmedien Wiesbaden GmbH, part of Springer Nature in 2019.

关键词： Automotive Engineering Energy Storage

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Ageing of roughness artefacts - Impact on the measurement results 17

Ageing of roughness artefacts - Impact on the measurement re...

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17th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2017

作者： Klauer, Katja Eifler, Matthias Schneider, Frank Seewig, Jörg Aurich, Jan C. University of Kaiserslautern Institute for Measurement and Sensor-Technology Germany University of Kaiserslautern Institute for Manufacturing Technology and Production Systems Germany

ISBN: (纸本)9780995775107

Ageing effects can influence the properties of engineering surfaces, especially when highly precise surface structures like roughness artefacts are considered. In order to describe the behaviour of roughness artefacts after a given period of use and storage, the impact of ageing on their use and recommendations for their handling are investigated. In the experimental studies the roughness artefacts were exposed to constant temperatures in a climatic chamber and extracted after individually defined time spans before their surface topography was characterised with a large number of stylus instrument measurements. As a quality indicator the ISO 13565-2 roughness parameters were evaluated to characterise the ageing process at different temperatures.

关键词： Surface roughness

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Contamination of roughness artefacts - Impact on the measurement results 15

Contamination of roughness artefacts - Impact on the measure...

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15th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2015

作者： Eifler, Matthias Schneider, Frank Bohley, Martin Aurich, Jan C. Seewig, Jörg University of Kaiserslautern Institute for Measurement and Sensor-Technology Germany University of Kaiserslautern Institute for Manufacturing Technology and Production Systems Germany

ISBN: (纸本)9780956679079

When roughness artefacts are used in the production environment, a contamination with operational residues is possible. There are many methods for the cleaning of technical surfaces, but no specific strategy regarding roughness artefacts is proven suitable. A study on the impact of contamination on the measurement results of roughness artefacts was carried out. Defined, production-related contaminations were applied and the samplings were cleaned with an ultrasonic cleaning system, compressed air, and CO2 snow blasting to examine the impact of dirt on the roughness parameters. Experimentally it can be shown that certain contaminations like metal swarf and cutting oil can be cleaned easily with different methods, while penetrating oil is hard to remove from the surface. It is possible to evaluate the quality of the cleaning methods and to give recommendations for cleaning.

关键词： Contamination

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Material characterisation of nano scale solid state electrolytes

Material characterisation of nano scale solid state electrol...

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International Workshop on Impedance Spectroscopy, IWIS 2011

作者： Wendler, Frank Freund, Markus Kanoun, Olfa Schadewald, Jörg Bufon, Carlos Cesar Bof Schmidt, Oliver G. Chemnitz University of Technology Measurement and Sensor Technology Chemnitz Germany Institute for Integrative Nanosciences IFW Dresden Dresden Germany

ISBN: (纸本)9780415644303

Impedance spectroscopy is widely used in material characterization and characterization of energy storage devices. In material analysis the specific properties of macro scale samples are in focus of investigation. However, the characteristic properties obtained with bulk measurements can differ from those measured at thin films. In the field of energy storage devices impedance spectroscopy is used to find parameter sets for modeling the individual storage behavior. Here the dimension of the device are of little interest. The combination of material as well as storage behavior characterization can be used in the case of chip level energy storage devices. For this, test structures are measured over a wide frequency range and analyzed via model based approach. With this process dielectric, resistive and electrochemical effects can be separated and analyzed in a quantitative way. The procedure was tested on nanometer range thin films of the solid state electrolyte LiPON based capacitors. Precise measurement of the energy storage material characteristics can support further optimization of the storage material and production processes. © 2012 Taylor & Francis Group.

关键词： Thin films

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Investigation of uorescence spectra disturbances inuencing the classification performance of uorescently labeled plastic akes

Investigation of uorescence spectra disturbances inuencing t...

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Videometrics, Range Imaging, and Applications XII;and Automated Visual Inspection

作者： Fomin, Petr Brunner, Siegfried Kargel, Christian Institute for Measurement and Automation Division of Sensor Technology and Measurement Systems Bundeswehr University Munich Werner-Heisenberg-Weg 39 85579 Neubiberg Germany

ISBN: (纸本)9780819496072

The recycling of plastic products becomes increasingly attractive not only from an environmental point of view, but also economically. For recycled (engineering) plastic products with the highest possible quality, plastic sorting technologies must provide clean and virtually mono-fractional compositions from a mixture of many different types of (shredded) plastics. In order to put this high quality sorting into practice, the labeling of virgin plastics with specific uorescent markers at very low concentrations (ppm level or less) during their manufacturing process is proposed. The emitted uorescence spectra represent \optical fingerprints - each being unique for a particular plastic - which we use for plastic identification and classification purposes. In this study we quantify the classification performance using our prototype measurement system and 15 different plastic types when various inuence factors most relevant in practice cause disturbances of the uorescence spectra emitted from the labeled plastics. The results of these investigations help optimize the development and incorporation of appropriate uorescent markers as well as the classification algorithms and overall measurement system in order to achieve the lowest possible classification error rates. © 2013 SPIE.

关键词： Plastic recycling

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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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Evaluation of low-cost sensing fibers in a fiber optic current sensor used for DC measurements in the power grid

Evaluation of low-cost sensing fibers in a fiber optic curre...

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Optica Sensing Congress 2023, AIS, FTS, HISE, sensors, ES 2023 - Part of Optical sensors and Sensing Congress 2023

作者： Mandl, Johannes Trampitsch, Philipp Klambauer, Reinhard Bergmann, Alexander Institute of Electric Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33 Graz8010 Austria

Two types of low-cost sensing fiber are evaluated in an inline fiber optic current sensor designated for use in the power grid. The fibers are investigated in terms of linear current response and sensitivity. © 2... 详细信息

ISBN: (纸本)9781957171241

关键词： Costs

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Parameters effect on basic DC to DC converter structures

Parameters effect on basic DC to DC converter structures

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International Multi-Conference on Systems, Signals and Devices

作者： Ben Amor, N. Kanoun, O. Derbel, N. Sfax National School of Engineering BPW Tunisia Department of Measurement and Sensor Technology University of Chemnitz Germany

ISBN: (纸本)9781457704130

Progress in low power Very Large Scale Integration (VLSI) design open up possibilities of powering wireless devises from scavenged ambient energy. An energy management system should be designed to manage the harvested energy. DC to DC converters represent the key element in energy management systems. Knowing the diversity of DC-DC converters generally designed for specific applications, basic converters are under scope in this paper. Operation principles and simulation patterns of basic DC to DC converters are first presented. Parameter simulation occurring the effect of duty cycle, inductance, capacity and switch polarisation is studied in depth. The gaol of this paper is to show main parameters effect on output voltage behaviour. Simulation results show that the main parameters in DC-DC converters design play a key role to avoid extra-lose of harvested energy. © 2011 IEEE.

关键词： DC-DC converters

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