Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220096
Asha Luckins, S. Duttagupta
This paper briefly explains the requirement of having reliable hybrid renewable energy sources for the sustainability of energy security of the grid. The wave parameters affecting electrical power potential of ocean waves and how these parameters are being sensed is being studied. Also the causes of waves are also discussed and these parameters are examined as well. A hybrid system with WECS and PV system is also studied and the power potential is analyzed. A simple algorithm has been proposed to select the renewable source so that maximum efficiency is achieved.
{"title":"Multisensor data fusion for parametric evaluation and optimization of hybrid solar and wave power source","authors":"Asha Luckins, S. Duttagupta","doi":"10.1109/ISPTS.2015.7220096","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220096","url":null,"abstract":"This paper briefly explains the requirement of having reliable hybrid renewable energy sources for the sustainability of energy security of the grid. The wave parameters affecting electrical power potential of ocean waves and how these parameters are being sensed is being studied. Also the causes of waves are also discussed and these parameters are examined as well. A hybrid system with WECS and PV system is also studied and the power potential is analyzed. A simple algorithm has been proposed to select the renewable source so that maximum efficiency is achieved.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"13 1","pages":"125-128"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81397285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220157
M. Pecht
Prognostics and health management is a method within the concepts of the Internet of Things, that permits the assessment of a system under its actual application conditions. It integrates sensor data with models that enable in-situ assessment of the “health” (e.g. deviation or degradation) of a system from an expected normal operating condition and also predicts the future state of the system based on current and historic conditions. This presentation discusses some methods used for anomaly detection and prognostics, including the monitoring and reasoning of parameters that are precursors to impending “failure”, such as shifts in performance parameters; and the modeling of stress and damage utilizing life cycle loads (e.g., usage, temperature, vibration, radiation). Examples of implementation methods and results are given.
{"title":"PT01. Prognostics and systems health management within the Internet of Things","authors":"M. Pecht","doi":"10.1109/ISPTS.2015.7220157","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220157","url":null,"abstract":"Prognostics and health management is a method within the concepts of the Internet of Things, that permits the assessment of a system under its actual application conditions. It integrates sensor data with models that enable in-situ assessment of the “health” (e.g. deviation or degradation) of a system from an expected normal operating condition and also predicts the future state of the system based on current and historic conditions. This presentation discusses some methods used for anomaly detection and prognostics, including the monitoring and reasoning of parameters that are precursors to impending “failure”, such as shifts in performance parameters; and the modeling of stress and damage utilizing life cycle loads (e.g., usage, temperature, vibration, radiation). Examples of implementation methods and results are given.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"26 1","pages":"i-i"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90806484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220082
Sudha Bendapudi, G. K. Kashyap, M. G. Lithin, M. Subhajit, B. Krishnamprasad, T. H. Shashikala
Star Sensor, also known as star-tracker, is a high-accuracy 3-axis attitude sensor used onboard spacecrafts. It processes stars from a sky image captured using an area imaging detector (generally 1k × 1k pixels Charge Coupled Device) to generate attitude information. Its accuracy about the boresight is poorer than about the cross-axes. This is improved by using two sensor heads with staggered Fields-Of-View (FOVs) and three to avoid break during occultation of any head. All the sensor heads have identical processing operations. So, the Processing Unit (PU) is made common. This minimizes the system electronics, power consumption and also thermal dissipation on each CH, allowing more efficient cooling of CCD and improving sensor performance. The resulting multiple Camera Heads (CHs) are operated remotely by the common PU. Thus, a programmable Video Processor (VP) is designed for the CH as an efficient data acquisition co-processor to the PU. The VP works in parallel freeing PU for attitude computation from the data acquired from multiple CHs. VP acquires CCD images and pre-processes them to reduce data size, speeding up PU processing. It is programmable for different modes of operation based on full-frame star-search or Region-of-Interest (ROI) readout, thereby providing flexibility, while maintaining rigidity in implementation as required by CCD. Communication of the VP with the PU is configured via low-power high-speed SpaceWire link. The VP is implemented in a low-power FPGA. All instruction and data storage is on-chip.
{"title":"Design of video processor for multi-head star sensor","authors":"Sudha Bendapudi, G. K. Kashyap, M. G. Lithin, M. Subhajit, B. Krishnamprasad, T. H. Shashikala","doi":"10.1109/ISPTS.2015.7220082","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220082","url":null,"abstract":"Star Sensor, also known as star-tracker, is a high-accuracy 3-axis attitude sensor used onboard spacecrafts. It processes stars from a sky image captured using an area imaging detector (generally 1k × 1k pixels Charge Coupled Device) to generate attitude information. Its accuracy about the boresight is poorer than about the cross-axes. This is improved by using two sensor heads with staggered Fields-Of-View (FOVs) and three to avoid break during occultation of any head. All the sensor heads have identical processing operations. So, the Processing Unit (PU) is made common. This minimizes the system electronics, power consumption and also thermal dissipation on each CH, allowing more efficient cooling of CCD and improving sensor performance. The resulting multiple Camera Heads (CHs) are operated remotely by the common PU. Thus, a programmable Video Processor (VP) is designed for the CH as an efficient data acquisition co-processor to the PU. The VP works in parallel freeing PU for attitude computation from the data acquired from multiple CHs. VP acquires CCD images and pre-processes them to reduce data size, speeding up PU processing. It is programmable for different modes of operation based on full-frame star-search or Region-of-Interest (ROI) readout, thereby providing flexibility, while maintaining rigidity in implementation as required by CCD. Communication of the VP with the PU is configured via low-power high-speed SpaceWire link. The VP is implemented in a low-power FPGA. All instruction and data storage is on-chip.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"98 1","pages":"59-62"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79482109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220113
Apoorva Garje, Y. Adhav, D. Bodas
In this paper, we present two-dimensional modeling and simulation of blood vessel using COMSOL Multiphysics. The rationale behind this study is that mathematical modeling and numerical simulation can lead to better understanding of the phenomena involved in vascular diseases. This study assumes that the fluid is laminar, non-Newtonian, viscous and compressible and the arterial wall is elastic. Parameters of blood vessel were assigned to the wall and parameters for fat deposits to the blockages. Blood is an example of a non-Newtonian fluid applied to the model in the present simulations. Structural deformation and fluid dynamics are determined simultaneously.
{"title":"Design and simulation of blocked blood vessel for early detection of heart diseases","authors":"Apoorva Garje, Y. Adhav, D. Bodas","doi":"10.1109/ISPTS.2015.7220113","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220113","url":null,"abstract":"In this paper, we present two-dimensional modeling and simulation of blood vessel using COMSOL Multiphysics. The rationale behind this study is that mathematical modeling and numerical simulation can lead to better understanding of the phenomena involved in vascular diseases. This study assumes that the fluid is laminar, non-Newtonian, viscous and compressible and the arterial wall is elastic. Parameters of blood vessel were assigned to the wall and parameters for fat deposits to the blockages. Blood is an example of a non-Newtonian fluid applied to the model in the present simulations. Structural deformation and fluid dynamics are determined simultaneously.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"1 1","pages":"204-208"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72642226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220089
Amit Pawbake, V. Waman, R. Waykar, A. Mayabadi, R. Kulkarni, H. Pathan, S. Jadkar
Hydrogenated nanocrystalline silicon carbide (nc-SiC:H) films were prepared by hot wire chemical vapor deposition (HW-CVD) method using ethane (C2H6) as a carbon precursor. The influence of deposition pressure on structural and optical properties was investigated. The formation of nc-SiC:H films was confirmed by low angle x-ray diffraction (XRD), Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy analysis. An inverse relation between deposition pressure and deposition rate was observed. Optical band gap values, ETauc and E04 increases with increase in deposition pressure. In fact, optical band gap values estimated from E04 method was found higher than the ETauc values calculated from Tauc's plot. Finally, at optimized deposition pressure (450 mTorr), a photo detector having configuration glass/nc-SiC:H/Al have been fabricated and its photo response was studied. Further study is required to improve the quality of nc-SiC:H films to make use in photo detectors.
{"title":"Synthesis of nanocrystalline silicon carbide thin films by HW-CVD using ethane carbon precursor for photo detector application","authors":"Amit Pawbake, V. Waman, R. Waykar, A. Mayabadi, R. Kulkarni, H. Pathan, S. Jadkar","doi":"10.1109/ISPTS.2015.7220089","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220089","url":null,"abstract":"Hydrogenated nanocrystalline silicon carbide (nc-SiC:H) films were prepared by hot wire chemical vapor deposition (HW-CVD) method using ethane (C2H6) as a carbon precursor. The influence of deposition pressure on structural and optical properties was investigated. The formation of nc-SiC:H films was confirmed by low angle x-ray diffraction (XRD), Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy analysis. An inverse relation between deposition pressure and deposition rate was observed. Optical band gap values, ETauc and E04 increases with increase in deposition pressure. In fact, optical band gap values estimated from E04 method was found higher than the ETauc values calculated from Tauc's plot. Finally, at optimized deposition pressure (450 mTorr), a photo detector having configuration glass/nc-SiC:H/Al have been fabricated and its photo response was studied. Further study is required to improve the quality of nc-SiC:H films to make use in photo detectors.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"33 1","pages":"88-93"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91231155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220104
T. Grigorie, P. Negrea, Florentina Cirstea
The paper presents theoretical and numerical study of a MEMS vibration gyro based Coriolis effect. Two configurations of the gyro are modeled and simulated here: 1) with assumed control on the excitation axis (a simplified configuration used to validate the second one); and 2) gyro controlled on the excitation axis. Shown are: general dynamic equations of the gyrometer, mathematical models ant the resulted block diagrams for the two configurations, the control strategy for the second configuration, software implementations of the models and numerical simulations results.
{"title":"Modelling and simulation of a miniaturized gyrometer","authors":"T. Grigorie, P. Negrea, Florentina Cirstea","doi":"10.1109/ISPTS.2015.7220104","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220104","url":null,"abstract":"The paper presents theoretical and numerical study of a MEMS vibration gyro based Coriolis effect. Two configurations of the gyro are modeled and simulated here: 1) with assumed control on the excitation axis (a simplified configuration used to validate the second one); and 2) gyro controlled on the excitation axis. Shown are: general dynamic equations of the gyrometer, mathematical models ant the resulted block diagrams for the two configurations, the control strategy for the second configuration, software implementations of the models and numerical simulations results.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"20 4","pages":"162-168"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91490517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220117
Pratanu Nag, P. Devi
There is a growing interest in developing efficient and economically viable hydrogen (H2) sensors for the swift detection of leakage of H2 in areas where hydrogen is used. In the present study we have prepared palladium catalysed antimony doped tin dioxide by sonochemical process, as a H2 gas sensing material for 1000 ppm to 8% by volume H2 gas concentration. The electrical characteristics of the sensors before and after the H2 exposure show significant changes at different temperatures. The response even shows more than 86% at 300 °C towards 1000 ppm H2 gas in a selective manner.
{"title":"Hydrogen sensing properties of antimony doped tin dioxide based taguchi type gas sensor: Effect of palladium","authors":"Pratanu Nag, P. Devi","doi":"10.1109/ISPTS.2015.7220117","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220117","url":null,"abstract":"There is a growing interest in developing efficient and economically viable hydrogen (H<sub>2</sub>) sensors for the swift detection of leakage of H<sub>2</sub> in areas where hydrogen is used. In the present study we have prepared palladium catalysed antimony doped tin dioxide by sonochemical process, as a H<sub>2</sub> gas sensing material for 1000 ppm to 8% by volume H<sub>2</sub> gas concentration. The electrical characteristics of the sensors before and after the H<sub>2</sub> exposure show significant changes at different temperatures. The response even shows more than 86% at 300 °C towards 1000 ppm H<sub>2</sub> gas in a selective manner.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"77 1","pages":"224-229"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91541615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220136
L. S. Vaidhyanathan, D. K. Baisnab, R. Baskaran, M. Janawadkar
The HTS SQUID sensors coupled to an on-chip integrated planar gradiometric pick-up loop were fabricated using highly reliable advanced micro-fabrication techniques such as deposition of superconducting thin films by Pulsed Laser Deposition (PLD), UV photolithography and RF ion beam etching. It may be noted that use of wire wound gradiometers and approaches based on electronic subtraction of sensor outputs to realize synthetic gradiometers have not been entirely satisfactory. We have designed a first order planar gradiometer with two planar loops in opposition with the Josephson weak links in the form of microbridges located at the centre. Bicrystal SrTiO3 substrates with a 24° misorientation angle were used for realizing the Josephson weak links using YBCO thin films, as well as HTS planar gradiometer coupled to a HTS SQUID sensor. The performance of these devices are evaluated.
{"title":"Development of planar first order gradiometer coupled to HTS SQUID sensor","authors":"L. S. Vaidhyanathan, D. K. Baisnab, R. Baskaran, M. Janawadkar","doi":"10.1109/ISPTS.2015.7220136","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220136","url":null,"abstract":"The HTS SQUID sensors coupled to an on-chip integrated planar gradiometric pick-up loop were fabricated using highly reliable advanced micro-fabrication techniques such as deposition of superconducting thin films by Pulsed Laser Deposition (PLD), UV photolithography and RF ion beam etching. It may be noted that use of wire wound gradiometers and approaches based on electronic subtraction of sensor outputs to realize synthetic gradiometers have not been entirely satisfactory. We have designed a first order planar gradiometer with two planar loops in opposition with the Josephson weak links in the form of microbridges located at the centre. Bicrystal SrTiO3 substrates with a 24° misorientation angle were used for realizing the Josephson weak links using YBCO thin films, as well as HTS planar gradiometer coupled to a HTS SQUID sensor. The performance of these devices are evaluated.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"61 1","pages":"310-312"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80277643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220074
R. Bhowmik, A. G. Lone, G. Vijayasri
The magneto-electronic properties have been demonstrated for a novel class of ferromagnetic semiconductors based on Ga doped a-Fe2O3 (hematite) system. The doping of the Ga atoms into the lattices of Fe sites of oc-Fe2O3 structure has been performed by chemical coprecipitation and mechanical alloying routes. Among the metal doped hematite systems, Ga doped oc-Fe2O3 system has been found as a good candidate for achieving simultaneous electric and magnetic field controlled magneto-electronic properties. The magnetic field dependent I-V characteristics and ferroelectric polarization, and ferromagnetic loop under electric field have suggested that Ga doped a-Fe2O3 system could be a potential candidate for the room temperature applications in spintronics devices, especially in magnetic sensors and switches as shown in this paper.
{"title":"Ga doped hematite (α-Fe2O3): A promising magnetic sensor material","authors":"R. Bhowmik, A. G. Lone, G. Vijayasri","doi":"10.1109/ISPTS.2015.7220074","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220074","url":null,"abstract":"The magneto-electronic properties have been demonstrated for a novel class of ferromagnetic semiconductors based on Ga doped a-Fe2O3 (hematite) system. The doping of the Ga atoms into the lattices of Fe sites of oc-Fe2O3 structure has been performed by chemical coprecipitation and mechanical alloying routes. Among the metal doped hematite systems, Ga doped oc-Fe2O3 system has been found as a good candidate for achieving simultaneous electric and magnetic field controlled magneto-electronic properties. The magnetic field dependent I-V characteristics and ferroelectric polarization, and ferromagnetic loop under electric field have suggested that Ga doped a-Fe2O3 system could be a potential candidate for the room temperature applications in spintronics devices, especially in magnetic sensors and switches as shown in this paper.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"39 1","pages":"22-26"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89255794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-07DOI: 10.1109/ISPTS.2015.7220100
S. Mehta, S. S. Suryavanshi, I. S. Mulla
Tungsten oxide is amongst the most widely used materials in electro-, photo-chromic applications. Recently tungsten oxide has been employed as sensing layer for detection of hazardous gases. In this work, we report synthesis of WO3 nanoparticles via a facile hydrothermal method using sodium tungstate and different organic acids (viz. citric acid, oxalic acid, malonic acid, and (L+) tartaric acid). We have investigated the effect/role of organic acid on the morphology and gas sensing properties. The X-ray diffraction (XRD) studies confirmed that citric acid and oxalic acid assisted routes give monoclinic structure (m-WO3) while malonic acid and (L+) tartaric acid give hexagonal structure (h-WO3). The nanoplate-like morphology was revealed by Scanning electron microscopy (SEM) analysis. The thick film of WO3 powder was deposited by using a screen printing technique. The gas response of thick films fired at 400°C/2h was studied. The change in the gas response of WO3 nanoplates for various concentrations and operating temperatures were studied for NOX, acetone, ethanol and ammonia vapors. In general, we observed response towards acetone, ethanol and ammonia vapors at higher operating temperature. However, the citric acid, oxalic acid and tartaric acid assisted WO3 exhibited good response for NOX at lower operating temperature (from 80°C-200°C). The gas response studies revealed that WO3 synthesized by citric acid assisted route exhibits highest sensitivity (S=77%) at 130°C towards NOX gas.
{"title":"Organic acids assisted hydrothermal synthesis of WO3 nanoplates and their gas sensing properties","authors":"S. Mehta, S. S. Suryavanshi, I. S. Mulla","doi":"10.1109/ISPTS.2015.7220100","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220100","url":null,"abstract":"Tungsten oxide is amongst the most widely used materials in electro-, photo-chromic applications. Recently tungsten oxide has been employed as sensing layer for detection of hazardous gases. In this work, we report synthesis of WO3 nanoparticles via a facile hydrothermal method using sodium tungstate and different organic acids (viz. citric acid, oxalic acid, malonic acid, and (L+) tartaric acid). We have investigated the effect/role of organic acid on the morphology and gas sensing properties. The X-ray diffraction (XRD) studies confirmed that citric acid and oxalic acid assisted routes give monoclinic structure (m-WO3) while malonic acid and (L+) tartaric acid give hexagonal structure (h-WO3). The nanoplate-like morphology was revealed by Scanning electron microscopy (SEM) analysis. The thick film of WO3 powder was deposited by using a screen printing technique. The gas response of thick films fired at 400°C/2h was studied. The change in the gas response of WO3 nanoplates for various concentrations and operating temperatures were studied for NOX, acetone, ethanol and ammonia vapors. In general, we observed response towards acetone, ethanol and ammonia vapors at higher operating temperature. However, the citric acid, oxalic acid and tartaric acid assisted WO3 exhibited good response for NOX at lower operating temperature (from 80°C-200°C). The gas response studies revealed that WO3 synthesized by citric acid assisted route exhibits highest sensitivity (S=77%) at 130°C towards NOX gas.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"1 1","pages":"142-146"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87078430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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