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Metal-organic framework (MOF)/reduced graphene oxide (rGO) composite for high performance CO sensor

Solid-State Electronics 2023年 204卷

作者： More, Mayuri S. Bodkhe, Gajanan A. Ingle, Nikesh N. Singh, Fouran Tsai, Meng-Lin Kim, Myunghee Shirsat, Mahendra D. RUSA Center for Advanced Sensor Technology Department of Physics Dr. Babasaheb Ambedkar Marathwada University MS Aurangabad431 004 India New Delhi110 067 India Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei City10607 Taiwan Department of Food Science and Technology Yeungnam University Gyeongsangbuk-do Gyeongsan38541 Korea Republic of

High performance gas sensors are urgently needed for the welfare of modern society. A challenge for sensors to detect analytes is its high response time. Herein, a carbon monoxide sensor has been fabricated using a NiO-based metal–organic framework(MOF)/reduced graphene oxide(rGO) composite. Synthesis of NiO-MOF and NiO-MOF/rGO were carried out by hydrothermal method. All the synthesized materials were multi parametrically tested by X-ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FT-IR), Raman spectroscopy, UV–visible spectroscopy, Atomic Force Microscopy (AFM), Field emission scanning electron microscopy (Fe-SEM), Current-Voltage characteristics (I-V), Brunauer-Emmett-Teller analysis (BET), etc. for their structural, spectroscopic, morphological, electrical, and surface properties respectively. The NiO-MOF/rGO based chemiresistive sensor fabricated on a glass substrate with a 100 µm gap through a shadow mask using an e-beam evaporator is stable up to 30 days and shows a selective response towards CO with excellent response and recovery, i.e. 30 s and 70 s respectively at 25 ppm. © 2023 Elsevier Ltd

关键词： Graphene

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Towards Fabrication of Next-Generation Physical sensors Through Integrating Suspended Sub-Micron Silicon Nanowires with Microelectromechanical Systems

Towards Fabrication of Next-Generation Physical Sensors Thro...

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IEEE sensorS

作者： Basit Ali Mehdi Bostan Shirin Muhammad Muzammil Ege Nacarkucuk Sina Zare Pakzad Umut Kerimzade B. Erdem Alaca Department of Mechanical Engineering Koç University Istanbul Turkey Computational Sciences and Engineering Program Koç University Istanbul Turkey Institute of Sensor and Actuator Systems TU Wien Austria Christian Doppler Laboratory for Piezoelectric Silicon MEMS with Enhanced Sensitivity and Responsivity Institute of Sensor and Actuator Systems TU Wien Austria nSTAR-Koç University Nanofabrication and Nanocharacterization Center for Scientific and Technological Advanced Research Koç University Istanbul Turkey Surface Science and Technology Center (KUYTAM) Koç University Istanbul Turkey

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

Silicon nanowires possess superior mechanical, electrical, and optical properties, making them ideal for next-generation sensors. This study presents a scalable technology for monolithic fabrication of sub-micron silicon nanowires with micro electromechanical systems, achieving integration of suspended sub-micron silicon nanowires within microelectromechanical systems up to 80 μm thick on Si substrates, with high yield and repeatability. The technological approach is validated on silicon-on-insulator substrates, followed by electromechanical characterization via electrical probe measurements and vibrational testing for performance validation. The presented technology is promising for the potential development of next-generation high-performance physical sensors such as accelerometers and gyroscopes.

关键词： Microelectromechanical systems sensor phenomena and characterization Vibration measurement Silicon sensor systems Nanowires Optical sensors Next generation networking Substrates Electromechanical sensors

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Evaluation of Adjacent and Opposite Current Injection Patterns for 3D Image Reconstruction of the Human Lung Based on a Realistic Model

Evaluation of Adjacent and Opposite Current Injection Patter...

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Impedance Spectroscopy (IWIS), International Workshop on

作者： Mejda Bouchhima Oumaima Bader Mariem Hafsa Salwa Sahnoun Najoua Essoukri Ben Amara Olfa Kanoun National School of Electronics and Telecommunications of Sfax University of Sfax Sfax Tunisia Professorship Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS - Laboratory of Advanced Technology and Intelligent Systems Sousse Tunisie Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Center of Sfax Sfax Tunisia

ISBN: (数字)9798331507626

ISBN: (纸本)9798331507633

Electrical Impedance Tomography (EIT) is a non-invasive, radiation-free imaging technique that can be used for 2D lung imaging. However, 2D EIT has a simplified geometric assumption, which neglects the 3D dynamic lung changes. This study develops a realistic 3D geometrical model including the lungs and thoracic cavity For EIT analysis. Finite Element (FE) models are generated for forward calculation and image reconstruction using an optimized Gauss-Newton (GN) algorithm. Two common current injection patterns - Adjacent and Opposite - are compared. Results show that using the lung-refined model with prior knowledge of the lungs' elements, GN converges with a Pearson correlation (r) of 0.9707 for the opposite pattern, higher than the adjacent pattern which reaches 0.9703. The second metric is the mean squared errors (MSE) between boundary voltages (BV) from reconstructed images and ground truth. It reaches $5.3965 \cdot 10^{-4},5.3963\cdot 10^{-4}$ , and $1.027{6}\cdot 10^{-12}$ for the Opposite pattern, respectively, for an empty cavity, lung-refined mesh without, and with prior knowledge of the lungs' elements. The results prove the efficiency of the Opposite injection pattern compared to the Adjacent pattern. These findings highlight the importance of injection patterns and the benefits of using a lung-refined mesh with prior knowledge of the lungs' elements for more accurate reconstructions.

关键词： Electrical impedance tomography Solid modeling Spectroscopy Three-dimensional displays Accuracy Correlation Lungs Imaging Finite element analysis Image reconstruction

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Pure frequency-based dispersive spectroscopy 9

Pure frequency-based dispersive spectroscopy

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9th Symposium on Frequency Standards and Metrology, FSM 2023

作者： Cygan, A. Bielska, K. Charczun, D. Kowzan, G. Nishiyama, A. Wcislo, P. Wójtewicz, S. Zaborowski, M. Maslowski, P. Lisak, D. Ciurylo, R. Fleisher, A.J. Gillis, K.A. Hodges, J.T. Voumard, T. Wilidi, T. Herr, T. Brasch, V. Institute of Physics Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University in Toruń ul. Grudziadzka 5 Toruń87-100 Poland Chemical Sciences Division National Institute of Standards and Technology 100 Bureau Drive GaithersburgMD20899 United States Sensor Science Division National Institute of Standards and Technology 100 Bureau Drive GaithersburgMD20899 United States Deutsches Elektronen-Synchrotron DESY Notkestr. 85 Hamburg22607 Germany CSEM - Swiss Center for Electronics and Microtechnology Neuchâtel2000 Switzerland National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono Ibaraki Tsukuba305-8563 Japan Physics Department Universität Hamburg UHH Luruper Chaussee 149 Hamburg22761 Germany

Dispersion spectroscopy based on frequency measurement of the high finesse optical cavity mode shifts induced by the presence of a gas medium with absorption resonances is an attractive alternative to standard absorptive spectroscopy. The main advantage of such pure frequency-based dispersive spectroscopy technique is the unique combination of sensitivity and accuracy. High sensitivity is ensured by high finesse optical cavities providing extremely long effective optical paths. On the other hand, high accuracy is provided by frequency measurement cavity mode shift. This makes this technique free from systematic errors coming from the non-linearity of light intensity measurements, which is one of the limiting factors in typical absorptive spectroscopy. We review several realizations of dispersive spectroscopy in high finesse optical cavities from Doppler-free to broadband. These techniques are especially useful for studying weak molecular transitions applicable in testing fundamental physics, gas metrology, spectroscopic thermometry, and a new generation of spectroscopic databases. © Published under licence by IOP Publishing Ltd.

关键词： Systematic errors

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High-throughput Platform for Screening Microbial Fuel Cell Components

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Procedia technology 2017年 27卷 260-262页

作者： A.S. Vishwanathan Kartik S. Aiyer S. Siva Sankara Sai Govind Rao Department of Biosciences Sri Sathya Sai Institute of Higher Learning Prasanthi Nilayam Puttaparthi – 515134 Andhra Pradesh India Department of Physics Sri Sathya Sai Institute of Higher Learning Prasanthi Nilayam Puttaparthi – 515134 Andhra Pradesh India Center for Advanced Sensor Technology Department of Chemical Biochemical and Environmental Engineering University of Maryland Baltimore County Baltimore Maryland 21250 USA

We present a multi-anode microbial fuel cell configuration that simplifies the process of optimization of components and operating parameters. Working of the high-throughput screening platform has been described using... 详细信息

关键词： microbial fuel cell high-throughput screening optimization

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A 1kW-class S-band compact waveguide combiner unit with GaN HPAs for WPT and space communication

A 1kW-class S-band compact waveguide combiner unit with GaN ...

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European Conference on Microwave

作者： Hirofumi Noji Yasuhiro Shibuya Kosuke Isono Masakazu Hori Yuta Kobayashi Toshio Ishizaki Shigeki Furuta Yukio Moriguchi Zen-ichi Yamamoto Shigeo Kawasaki Applied Physics Department Tokyo University of Science Japan Electrical Engineering Department Tokyo University of Science Japan Institute of Space and Astronautical Science Japan AeroSpace Exploration Agency Sagamihara Kanagawa Japan Advanced Devices Development Center Panasonic Corporation Japan Technology Development Division NEC Network and Sensor Systems Limited Japan

Using a GaN high power amplifier and a double 4-inputport circular waveguide combiner, a 1kW S-band compact waveguide combiner unit operating at 2.1 GHz was assembled. The maximum power of 200W was realized with a Peltier device for heat sink. The high power amplifier unit shows the PAE of more than 50% with an AB-class operation under the temperature around 40 degrees C. The four GaN high power amplifiers were combined with the 4-inputports circular waveguide combiner, having an output power of 540W. Further the 1kW output power connecting two 500W-class power combiners was achieved. The combining efficiency of the 1kW-class power combiner unit was achieved to about 90%.

关键词： Power generation Power combiners High power amplifiers Cooling Gallium nitride

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Four-wave mixing in copper ion modified-DNA nanostructure in solution

Four-wave mixing in copper ion modified-DNA nanostructure in...

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OptoElectronics and Communications Conference, OECC

作者： Byeongho Park Dugasani Sreekantha Reddy Min Ah Seo Taikjin Lee Seong Chan Jun Seok Lee Sung Ha Park Fabian Rotermund Jae Hun Kim Chulki Kim School of Mechanical Engineering Yonsei Univ. Seoul Korea Sungkyunkwan Advanced Institute of Nanotechnology and Department of Physics Sungkyunkwan Univ Suwon Korea Sensor System Research Center Korea Institute of Science and Technology (KIST) Seoul Korea Division of Energy Systems Research and Department of Physics Ajou Univ. Suwon Korea

We report the observation of four-wave mixing phenomenon on copper ion modified-DNA nano-structure in solution. Z-scan technique with a femtosecond lasing system is employed to determine the nonlinear refractive index... 详细信息

关键词： Laser beams Copper Four-wave mixing Refractive index Optical filters Optical mixing

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Editorial: 3GPP LTE and LTE-advanced

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Eurasip Journal on Wireless Communications and Networking 2009年 2009卷

作者： Clerckx, Bruno Lozano, Angel Sesia, Stefania Van Rensburg, Cornelius Papadias, Constantinos B. Communication Laboratory Samsung Advanced Institute of Technology Samsung Electronics Yongin-Si 446-712 Korea Republic of Department of Information and Communication Technologies Universitat Pompeu Fabra 08002 Barcelona Spain Mobile Competence Center 06921 Sophia Antipolis Cedex France Wireless RandD Laboratory Huawei Technologies Plano TX 75075 United States Broadband Wireless and Sensor Networks Athens Information Technology Markopoulo Avenue Peania 19002 Athens Greece

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Biocompatible and Breathable All-Fiber-Based Piezoresistive sensor with High Sensitivity for Human Physiological Movements Monitoring

SSRN

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SSRN 2022年

作者： Du, Wenwen Li, Zekun Zhao, Yilin Zhang, Xiang Pang, Linlin Wang, Wei Jiang, Tao Yu, Aifang Zhai, Junyi School of Chemistry and Chemical Engineering Center on Nanoenergy Research School of Physical Science and Technology Guangxi University Nanning530004 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing101400 China School of Advanced Materials and Nanotechnology Interdisciplinary Research Center of Smart Sensors Xidian University Xi’an712000 China School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing100049 China

Flexible pressure sensors have attracted tremendous attention for their various potential applications in wearable electronics, personal health monitoring, disease diagnosis, and smart electronic skin (E-skin). However, the preparation of pressure sensors with high flexibility, lightweight, breathability, favorable biocompatibility, and excellent sensing performance for comfortable and comprehensive human physiological movements monitoring is still a great challenge and highly desired. Herein, we present a biocompatible and breathable all-fiber-based piezoresistive sensor with high sensitivity. The device is elaborately assembled from a porous polyvinylidene fluoride (PVDF) nanofiber film impregnated with conductive MXene nanosheets (MXene/PVDF) as the sensitive layer, and a porous PVDF nanofiber film with magnetron sputtered Ag interdigital electrode (Ag/PVDF) as the electrode layer, with polyimide (PI) introduced in between as the insulation layer. The all-PVDF nanofiber structure enables the sensor to demonstrate excellent flexibility, reliable breathability, and favorable biocompatibility. Remarkably, benefitting from the insulation layer, the sensitivity of the sensor is further enhanced (up to 1970.65 kPa-1), which is about 13 times than that without the insulation layer. Moreover, the sensor also exhibits other excellent characteristics such as wide detection range (up to 30 kPa), rapid response/recovery time (10/20 ms), and excellent cycling stability (10000 cycles). These superior performances lay a foundation for the application of comprehensive human motion monitoring and pressure spatial distribution detection. Our study provides an effective strategy for fabricating flexible pressure sensors with good comprehensive properties in the field of intelligent wearable electronics. © 2022, The Authors. All rights reserved.

关键词： Pressure sensors

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A stable and highly-sensitive flexible gas sensor based on Ceria (CeO2) nano-cube decorated rGO nanosheets for selective detection of NO2 at room temperature

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Synthetic Metals 2023年 297卷

作者： Takte, Mahesh A. Ingle, Nikeshkumar N. Dole, Babasaheb N. Tsai, Meng-Lin Hianik, Tibor Shirsat, Mahendra D. RUSA Center for Advanced Sensor Technology Department of Physics Dr. Babasaheb Ambedkar Marathwada University MS Aurangabad431 004 India MGM University Aurangabad MS India Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Nuclear Physics and Biophysics Faculty of Mathematics Physics and Informatics Comenius University Bratislava842 48 Slovakia

Sensing and monitoring nitrogen dioxide (NO2) gas is essential, due to its adverse effect on humans and the environment. However, conventional NO2 gas-sensing materials have limitations like elevated temperature operations, lower response, and low selectivity. Herewith, ceria nano-cube decorated reduced graphene oxide nanosheets (CeO2@rGO) were synthesized by a hydrothermal process, and as-synthesized products were characterized by various methods, viz. XRD, FE-SEM, FTIR, Raman spectrometer, BET, and IV characteristics. Afterwards, CeO2@rGO flexible gas sensor was fabricated by drop-cast technique, which is utilized for real-time monitoring of NO2 at room temperature (RT) (24ºC). Notably, the CeO2@rGO-based sensor upholds a significantly high response of 52.84 % towards 70 ppm of NO2, with an ultrafast response and recovery time of 7 s and 58 s respectively, with the LOD of 1 ppm. In addition, the CeO2@rGO flexible gas sensor exhibited long-term stability up to 30 days, solid repeatability, and stability in high relative humidity (RH) conditions. The marvelous sensing characteristics of the CeO2@rGO were attributed to the synergetic effect between CeO2 and rGO. The mechanism of sensing response was exhaustively interpreted by the "surface electron depletion layer mechanism". Certainly, the scientific investigation conducted in the present study will undeniably advance the possible uses of detecting NO2 at RT. © 2023 Elsevier B.V.

关键词： Cerium oxide

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