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A morphology-dependent study of V₂O₅@rGO nanocomposite-based chemiresistive room temperature gas sensor for detecting NO₂

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Synthetic Metals 2025年 313卷

作者： Takte, Mahesh A. Chavhan, Gopal M. Fulari, Akash V. Tsai, Meng-Lin Hianik, Tibor Shirsat, Mahendra D. RUSA Center for Advanced Sensor Technology Department of Physics Dr. Babasaheb Ambedkar Marathwada University MS Chhatrapati Sambhajinagar (Aurangabad) 431 004 India Department of Electronics Dr. Babasaheb Ambedkar Marathwada University MS Chhatrapati Sambhajinagar (Aurangabad) 431 004 India Symbiosis Centre for Nanoscience and Nanotechnology Symbiosis International (Deemed University) MS Pune 412115 India Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei 10607 Taiwan Department of Nuclear Physics and Biophysics Faculty of Mathematics Physics and Informatics Comenius University Bratislava 842 48 Slovakia

We performed the shape-selective analysis of two different morphologies of mesoporous vanadium pentoxide (V2O5) composite containing reduced graphene oxide (rGO), namely nanorods (V2O5NR@rGO) and nanoparticles (V2O5NP... 详细信息

We performed the shape-selective analysis of two different morphologies of mesoporous vanadium pentoxide (V₂O₅) composite containing reduced graphene oxide (rGO), namely nanorods (V₂O₅NR@rGO) and nanoparticles (V₂O₅NP@rGO), respectively, as an efficient nitrogen dioxide sensor (NO₂). We have shown that the sensor's response highly depends on the sample's morphology, which can be described by the combined effect of surface area, pore size/distribution, crystallinity, and surface defects. The V₂O₅NR@rGO composite showed higher sensitivity with faster response and recovery times than the V₂O₅NP@rGO composite. The response of the sensors at ambient conditions can be attributed to the fast charge carrier mobility of rGO at room temperature (RT). The proposed gas sensor exhibited excellent stability, higher sensitivity, high repeatability, and better selectivity towards different gases with an acceptable detection limit (LOD) of 1.33 ppm and 2.32 ppm for V₂O₅NR@rGO and V₂O₅NP@rGO, respectively. These properties reveal the sensor's wonderful potential for real-time detection of NO₂. © 2025 Elsevier B.V.

关键词： Gas sensor Metal Oxide Morphology RGO

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Indoor air quality monitoring system using wireless sensor network (WSN) with web interface

Indoor air quality monitoring system using wireless sensor n...

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International Conference on Electrical, Electronics and System Engineering (ICEESE)

作者： Shaharil Mad Saad Abdul Rahman Mohd Saad Azman Muhamad Yusof Kamarudin Ammar Zakaria Ali Yeon Md Shakaff Centre of Excellence for Advanced Sensor Technology (CEASTech) University Malaysia Perlis Malaysia Universiti Malaysia Perlis Arau Perlis MY

Indoor air quality (IAQ) is a term that describes the air quality of the building occupants. IAQ can be influenced by physical factors like dust particles, chemical or gaseous pollutants (including carbon dioxide, carbon monoxide and volatile organic compounds) and biological factors like molds and bacteria growth which largely depend on temperature and humidity condition of a room. These kinds of pollutants can induce a bad health effects to building occupants. In this study, a web-based system for monitoring indoor air quality is presented. The system has been developed to monitor the environmental parameters of air quality like gaseous pollutants, particulate matter, temperature and humidity that can affect the occupant's comfort, health and indoor work environment if not properly maintained. Generally, the system consists of a desktop computer acting as base station, an array of metal oxide gas sensor, temperature and humidity sensor, particle dust sensor and wireless sensor network (WSN) node as a wireless transmitter. The measured data from sensors are sent to base station via WSN node. The computer will log the collected data using a self-developed server program which can be accessed through the web.

关键词： Wireless sensor networks Temperature sensors Buildings Temperature measurement Monitoring Base stations

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Electrical measurement on individual multi-walled carbon nanotubes

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中国有色金属学会会刊：英文版 2006年第B02期16卷 772-775页

作者：邹小平 H.ABE T.SHIMIZU A.ANDO H.OKUMOTO 朱申敏周豪慎 Research Center for Sensor Technology Beijing Information Technology Institute Beijing 100101China Beijing Key Laboratory for Sensor Beijing 100101 China Nanotechnology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 HigashiTsukubaIbalaki 305-8562Japan Energy Electronics Research Institute National Institute of Advanced Industrial Science and Technology (AIST)1-1-1 UmezonoTsukubaIbalaki 305-8568Japan Energy Electronics Research InstituteNational Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 UmezonoTsukubaIbalaki 305-8568Japan Nanotechnology Research InstituteNational Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 HigashiTsukubaIbalaki 305-8562Japan Nano-electronics Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Umezono Tsukuba Ibalaki 305-8568 Japan Nanotechnology Research Center Research Institute for Electronic ScienceHokkaido UniversitySapporo 001-0021Japan Energy Electronics Research InstituteNational Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 UmezonoTsukubaIbalaki 305-8568Japan Energy Electronics Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Umezono Tsukuba Ibalaki 305-8568Japan

The characterization of electrical property of multi-walled carbon nanotubes (MWCNTs) on a nanometer scale is essential for their potential application in nano-electronic devices. The MWCNTs were synthesized on Fe2O3/SiO2/Si substrate and Pt plate substrate by simple thermal chemical vapor deposition (STCVD) technique and the electrical measurements of individual MWCNT grown on silicon substrate and Pt plate substrate were performed by home-made 'nano-manipulator', respectively. According to current-voltage curves obtained in the experiments the current density that the MWCNTs can carry is calculated to be about 107 A/cm2, which is much larger than that of normal metals.

关键词：多壁碳纳米管电学测量简易热化学汽相沉积合成

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High resolution fluorescence-based temperature sensor for stand-off detection in physiological range

High resolution fluorescence-based temperature sensor for st...

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12th IEEE sensorS 2013 Conference

作者： Kuester, Timothy Robucci, Ryan Lam, Hung Rao, Govind Kostov, Yordan Dept. Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD United States Center for Advanced Sensor Technology Dept. of Chem. Biochem and Env. Engineering University of Maryland Baltimore County Baltimore MD United States

ISBN: (纸本)9781467346405

Fluorescence ratiometric temperature sensing system for stand-off temperature measurements in the physiological range is presented. It is based on the use of fluorescence dyes and an integrating photodetector system. The system is intended for use in neonatal intensive care units (NICU). It utilizes a measurement and a reference fluorescence dyes encapsulated in a film. Fluorescence is excited using LEDs and the emission is detected using photodiodes equipped with optical band pass filters. The current generated by the photodiodes is integrated and the charge is digitized. The fluorescence intensity is calculated as the difference in the measured intensities when the LED is on or off. The ratio of the two emission intensities depends linearly on the temperature. The system operates under room-light illumination with resolution

关键词： Fluorescence

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Wavelength Dependent Ammonia Sensing Characteristics of SnO2 based Fiber Optic sensor 2

Wavelength Dependent Ammonia Sensing Characteristics of SnO2...

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2nd International Conference on Materials Science and technology, ICMST 2016

作者： Narasimman, S. Balakrishnan, L. Meher, S.R. Sivacoumar, R. Rufus, Elizabeth Alex, Z.C. School of Electronics Engineering VIT University Vellore632 014 India Department of Physics Government College of Technology Coimbatore641 013 India Department of Physics School of Advanced Sciences VIT University Vellore632 014 India Department of Sensor and Biomedical Technology School of Electronics Engineering VIT University Vellore632 014 India

SnO2 nanoparticles were synthesized by co-precipitation technique. The synthesized SnO2 nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and UV-visible diffused reflectance spectrometer (DRS). The XRD results addressed that the SnO2 nanoparticles was crystallized in rutile tetragonal structure. The SEM analysis confirms that the prepared nanopowder is composed of nanoparticles. Analysis of the DRS UV-Vis spectrum showed that the band gap of the synthesized SnO2 is to be ∼3.4 eV. The small cladding portion of the optical fiber was replaced with the synthesized nanoparticles. The ammonia sensing characteristics of the prepared SnO2 nanoparticles were analyzed for different wavelength ranges (red, yellow and blue) using polymethyl methacrylate fiber. It has been found that the synthesized SnO2 nanoparticles shows high sensitivity (∼23) in yellow wavelength range compared with red and blue wavelength ranges at room temperature. © 2018 Institute of Physics Publishing. All rights reserved.

关键词： Titanium dioxide

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Bio-inspired sensor Fusion for Quality Assessment of Harumanis Mangoes

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Procedia Chemistry 2012年 6卷 165-174页

作者： F.S.A. Sa’ad A. Zakaria A.Y.M. Shakaff M.Z. Abdullah A.H. Adom M.N. Jaafar M.J. Masnan L.M. Kamarudin Centre of Excellence for Advanced Sensor Technology Universiti Malaysia Perlis 02600 Arau Perlis Malaysia School of Electrical and Electronic Engineering Universiti Sains Malaysia 01000 Penang Malaysia

In recent years, there have been a number of reported studies on the use of non-destructive technique to evaluate and determine mango maturity and ripeness levels. However, most of these reported works were conducted using single-modality sensing systems, either using an electronic nose (e-nose), acoustics, CCD, IR sensor or by other non-destructive measurements. This paper presents the work on the classification of mangoes ( Magnifera Indica cv. Harumanis ) maturity and ripeness levels using data fusion of the electronic nose (e-nose) and acoustic sensor and combine with CCD and IR sensor. A Fourier-based shape separation method was developed from CCD camera images to grade mango by its shape and able to correctly classify 100%. Colour intensity from infrared image was used to distinguish and classify the level of maturity and ripeness of the fruits. The finding shows 92% correct classification of maturity levels by using infrared vision Three groups of samples each from two different harvesting times (week 7 and week 8) were evaluated by the e-nose and then followed by the acoustic sensor. By applying a low level data fusion technique on the e-nose and acoustic data, the classification for maturity and ripeness levels using LDA was improved.

关键词： machine vision fourier descriptor harumanis mango grading system automated inspection acoustic e-nose

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Energy transmission focused system design of passive RFID smart labels containing an electronic paper display

Energy transmission focused system design of passive RFID sm...

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Smart Systems Integration 2007 - European Conference and Exhibition on Integration Issues of Miniaturized Systems: MEMS, MOEMS, ICs and Electronic Components, SSI 2007

作者： Reinhold, C. Scholz, P. John, W. Hilleringmann, U. University of Paderborn Department of Electrical Engineering Sensor Technology Group Germany Fraunhofer IZM Departement Advanced System Engineering Paderborn Germany

This contribution focuses on system design considerations of an RFID system containing a bistable Electronic Paper Display (EPD). Special attention is given to the energy transmission while guaranteeing a reliable data transmission. The optimum operating frequency is chosen and a simplified system model is presented. Based on this, simulations are carried out in order to characterize the transient behavior of the system. © 2007 Mesago Messe Frankfurt GmbH. All rights reserved.

关键词： Systems analysis

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Design of a multi-octave balun for phased array antennas

Design of a multi-octave balun for phased array antennas

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6th Loughborough Antennas and Propagation Conference, LAPC 2010

作者： Pinto, J. Guy, R.F. Lewis, G.M. Lewis, R.A. Sensor Systems Dept. BAE Systems Advanced Technology Centre West Hanningfield Rd Great Baddow Chelmsford United Kingdom

ISBN: (纸本)9781424473052

In the drive for the development of wideband array antennas for military applications, a well designed balun is essential to achieve overall antenna performance. However, for balanced antenna arrays to be driven effectively, antiphase element feeds are required at the correct impedance over multiple octaves. This paper summarises balun design options in microstrip and stripline for use with highly coupled dipoles giving a 4:1 bandwidth from 2.7-10.8GHz. ©2010 IEEE.

关键词： Military applications

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Investigation of Wireless sensor Network Energy Detection under varying WiFi Multimedia Streaming in Real-home Environment

Investigation of Wireless Sensor Network Energy Detection un...

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IEEE Region 10 Conference

作者： Noraini Azmi Latifah Munirah Kamarudin David Lorater Ndzi Sabira Khatun Ammar Zakaria School of Computer and Communication Engineering Universiti Malaysia Perlis University of Portsmouth Centre for Advanced Sensor Technology (CEASTech) Universiti Malaysia Perlis

ISBN: (纸本)9781509025985

Wireless sensor Network (WSN) is vulnerable to interference from other wireless technologies such as WLAN, Bluetooth and cordless phone due to its low transmission power, data rate and bandwidth. Energy Detection (ED) is one of the available sensing technique available in Clear Channel Assessment (CCA) that is used to reduce packet collision due to interference and hidden terminal problem. To the authors' knowledge, there are numerous studies that have been conducted to investigate the coexistence of WSN with other wireless technologies and methods to overcome interference have been proposed. However, only a few studies involves ED. Thus, this study aims to investigate the impact of multimedia streaming on ED and packet loss in the home environment. A series of experimental tests were conducted in actual environment in order to study the interference phenomenon of ED and packet loss. This investigation will provide some valuable insight regarding ED in real-home environment and findings from this study will served as a baseline study or reference for future studies.

关键词： Audio Streaming Energy Detection Energy Scanning IEEE802.15.4 IEEE802.11 Performance Analysis Traffic Video Streaming WLAN WSN

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Image processing and analysis system for corneal endothelial cell based on labVIEW and MATLAB

Image processing and analysis system for corneal endothelial...

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2014 International Conference on Manufacturing technology and Electronics Applications, ICMTEA 2014

作者： Yu, Cheng Bo Ke, Yan Hong Xiao, Dan Yuan, Yang Yu Yang, Yi Ju Remote Test and Control Institute Chongqing University of Technology Chongqing China Time grating sensor and advanced detection technology City key Laboratory of Chongqing China

ISBN: (纸本)9783038353287

To process corneal endothelial cell image quickly and efficiently, observe the corneal endothelial cell form and relevant calculation and analysis. This system adopts mixed programming of LabVIEW and MATLAB, to have image processing and analysis of the corneal endothelial cell. Use LabVIEW to design operation and display interface, and send the images collected to MATLAB for complex arithmetical operation, then put out data in LabVIEW. The experiment indicates the system has the advantage of intuitive interface, convenient operation, and quick arithmetic, has the practical reference value. © (2014) Trans Tech Publications, Switzerland.

关键词： MATLAB

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