Pub Date : 2012-03-07DOI: 10.1109/ISPTS.2012.6260935
Poonam D. Mahapure, V. Mathe, R. Aiyer, S. Gosavi, P. Adhyapak, D. Amalnerkar
Ag particles having different sizes (A1 A2 A3 A4 and A5) were in situ synthesized by using chemical route in 0.01M PVP. Size dependent humidity sensing was studied by direct optical transmission method. Structural characterization and elemental analysis of the synthesized materials is carried out using UV-Visible, DLS and Impedance spectra. Change in impedance spectra with reaction time gave explanation about structural changes in polymer nanocomposite. Samples taken out after reaction time of 30 min show more sensitivity during wide humidity sensing range (2–94 % RH) i.e. 5.37 (78–94), 2.31 (77–59) and 0.32 (2–58) mv/% RH. A1samples have low hysteresis with response and recovery time of about 24 and 33 sec respectively. They have shown good repeatability over 7 cycles and reproducibility for two samples.
{"title":"Size dependent relative humidity sensing of Ag/PVP nanocomposites by direct optical transmission method","authors":"Poonam D. Mahapure, V. Mathe, R. Aiyer, S. Gosavi, P. Adhyapak, D. Amalnerkar","doi":"10.1109/ISPTS.2012.6260935","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260935","url":null,"abstract":"Ag particles having different sizes (A1 A2 A3 A4 and A5) were in situ synthesized by using chemical route in 0.01M PVP. Size dependent humidity sensing was studied by direct optical transmission method. Structural characterization and elemental analysis of the synthesized materials is carried out using UV-Visible, DLS and Impedance spectra. Change in impedance spectra with reaction time gave explanation about structural changes in polymer nanocomposite. Samples taken out after reaction time of 30 min show more sensitivity during wide humidity sensing range (2–94 % RH) i.e. 5.37 (78–94), 2.31 (77–59) and 0.32 (2–58) mv/% RH. A1samples have low hysteresis with response and recovery time of about 24 and 33 sec respectively. They have shown good repeatability over 7 cycles and reproducibility for two samples.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"65 1","pages":"240-243"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84370270","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260948
A. Kamble, N. Harale, P. Patil, B. Sinha, K. Chung
A pure and ZnO added CdO thin films are prepared by chemical bath deposition to study their ethanol sensing properties. The depositions were carried out in a highly alkaline condition where in cadmium acetate was used as a source of cadmium while zinc acetate was added as the source of Zn inclusion. These films were subsequently annealed at 723K and studied for its morphological, optical and gas sensing response to understand the effect of ZnO addition. The optical response for the composite film interestingly depicted the existence of separate absorption signature for CdO and ZnO in visible region at around 550 nm and 360nm respectively, thereby confirming the formation of composite structure. The smooth surfaced CdO nano-wires apparently got transformed in to beaded nano wires with the addition of ZnO. The overall diameter of the CdO wires decreased from around 60 nm to approximately 40 nm for CdO-ZnO composite films. This has remarkably enhanced the ethanol gas sensing response from 39% to 61% for the CdO-ZnO composite thin film.
{"title":"CdO and CdO-ZnO composite nanowires: Synthesis, characterization and ethanol gas response","authors":"A. Kamble, N. Harale, P. Patil, B. Sinha, K. Chung","doi":"10.1109/ISPTS.2012.6260948","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260948","url":null,"abstract":"A pure and ZnO added CdO thin films are prepared by chemical bath deposition to study their ethanol sensing properties. The depositions were carried out in a highly alkaline condition where in cadmium acetate was used as a source of cadmium while zinc acetate was added as the source of Zn inclusion. These films were subsequently annealed at 723K and studied for its morphological, optical and gas sensing response to understand the effect of ZnO addition. The optical response for the composite film interestingly depicted the existence of separate absorption signature for CdO and ZnO in visible region at around 550 nm and 360nm respectively, thereby confirming the formation of composite structure. The smooth surfaced CdO nano-wires apparently got transformed in to beaded nano wires with the addition of ZnO. The overall diameter of the CdO wires decreased from around 60 nm to approximately 40 nm for CdO-ZnO composite films. This has remarkably enhanced the ethanol gas sensing response from 39% to 61% for the CdO-ZnO composite thin film.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"29 1","pages":"286-289"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79991128","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260873
Brince Paul, Melvin P. Manuel, Z. C. Alex
One of the biggest health challenges of 21st century is diabetics due to its exponential increase in the diabetics patients in the age group of 20–79 years. To prevent the complication due to diabetics it is essential to monitor the blood glucose level continuously. Most of the regular glucose measurement systems are invasive in nature. Invasive methods cause pain, time consumption, high cost and potential risk of spreading infection diseases. Therefore there is a great demand to have reliable cost effective and comfortable non invasive system for the detection of blood glucose level continuously. The proposed method is based on the direct effect of glucose on the scattering properties of the organ. Glucose decreases the mismatch in refractive index between scatterers and their surrounding media, leading to a smaller scattering coefficient and, consequently, a shorter optical path. The reduction in scattering is due to an increase in glucose concentration. As a result, with the growing concentration of glucose, fewer photons are absorbed and the light intensity increases. In the present work, we have used PPG technique. An algorithm was developed from the PPG data for monitoring blood glucose. The result obtained from this technique was compared with ARKRAY, Glucocard tm01-mini and found good agreement.
{"title":"Design and development of non invasive glucose measurement system","authors":"Brince Paul, Melvin P. Manuel, Z. C. Alex","doi":"10.1109/ISPTS.2012.6260873","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260873","url":null,"abstract":"One of the biggest health challenges of 21st century is diabetics due to its exponential increase in the diabetics patients in the age group of 20–79 years. To prevent the complication due to diabetics it is essential to monitor the blood glucose level continuously. Most of the regular glucose measurement systems are invasive in nature. Invasive methods cause pain, time consumption, high cost and potential risk of spreading infection diseases. Therefore there is a great demand to have reliable cost effective and comfortable non invasive system for the detection of blood glucose level continuously. The proposed method is based on the direct effect of glucose on the scattering properties of the organ. Glucose decreases the mismatch in refractive index between scatterers and their surrounding media, leading to a smaller scattering coefficient and, consequently, a shorter optical path. The reduction in scattering is due to an increase in glucose concentration. As a result, with the growing concentration of glucose, fewer photons are absorbed and the light intensity increases. In the present work, we have used PPG technique. An algorithm was developed from the PPG data for monitoring blood glucose. The result obtained from this technique was compared with ARKRAY, Glucocard tm01-mini and found good agreement.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"40 1 1","pages":"43-46"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82820418","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260869
S. Viswanathan, Pingzuo Li, Wonbong Choi, S. Filipek, T. Balasubramaniam, V. Renugopalakrishnan
Health care is poised to revolutionize the present century with scalable technology and the collaborative power of the internet. The quest for greater efficiency in the delivery of health care services is eternal for a country that spends far more on health care that outstrips many other segments of the economy. In several countries, healthcare expenditure will grow at a faster pace than their economic growth (20% of GDP by 2014 in US). So there is a need to establish a robust health information system for effective delivery of health services. This should begin with prevention, and continue with an integrated approach to manage chronic illnesses, treat ongoing healthcare needs, and address life-threatening diseases. In order to achieve this, there will be a compelling need to integrate an ever-increasing body of scientific knowledge of both generalized and individualized practice. Nanotechnology affords cost-effective medical devices that can be used for self monitoring. Automated monitoring devices that can effectively track serum lipids, serum glucose and glycosylated hemoglobin in a single platform will make home-monitoring, outpatient and inpatient monitoring easy.
{"title":"Protein-carbon nanotube and graphene sensors: Single platform integrated micro clinical lab for monitoring blood analytes","authors":"S. Viswanathan, Pingzuo Li, Wonbong Choi, S. Filipek, T. Balasubramaniam, V. Renugopalakrishnan","doi":"10.1109/ISPTS.2012.6260869","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260869","url":null,"abstract":"Health care is poised to revolutionize the present century with scalable technology and the collaborative power of the internet. The quest for greater efficiency in the delivery of health care services is eternal for a country that spends far more on health care that outstrips many other segments of the economy. In several countries, healthcare expenditure will grow at a faster pace than their economic growth (20% of GDP by 2014 in US). So there is a need to establish a robust health information system for effective delivery of health services. This should begin with prevention, and continue with an integrated approach to manage chronic illnesses, treat ongoing healthcare needs, and address life-threatening diseases. In order to achieve this, there will be a compelling need to integrate an ever-increasing body of scientific knowledge of both generalized and individualized practice. Nanotechnology affords cost-effective medical devices that can be used for self monitoring. Automated monitoring devices that can effectively track serum lipids, serum glucose and glycosylated hemoglobin in a single platform will make home-monitoring, outpatient and inpatient monitoring easy.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"32 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80880420","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260970
P. B. Orpe, A. Shinde, S. Gosavi, R. Aiyer, V. Sathe
Single step synthesis of ZnO nanostructure thick films gas sensor has been adopted by using zinc metal as precursor. The ZnO was coated directly onto the alumina substrate by just spreading zinc powder using glass slides and then firing at 700°C for 1,2 and 3 hour and the film nicely adhere to the substrate. The surface morphology was studied using SEM which revealed the formation of different structures such as tetrapods, nanowires and porous structure onto the substrate. The crystal structure of ZnO was observed through X-ray diffraction to be hexagonal wurzite but containing small amount of zinc. UV Absorption spectroscopy shows the blue shift in the wavelength than the bulk ZnO, while blue emission is observed Photoluminescence Spectroscopy with the defect states at the near band edge. Also Raman Spectroscopy was performed in order to study the vibrational modes of ZnO nanostructures in the wavelength range of 200–1100nm. Thus prepared ZnO thick films were tested for 50–150ppm of CO gas in static chamber of volume 24 liters.
{"title":"Single step synthesis of ZnO nanostructure thick films and its application as CO gas sensor","authors":"P. B. Orpe, A. Shinde, S. Gosavi, R. Aiyer, V. Sathe","doi":"10.1109/ISPTS.2012.6260970","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260970","url":null,"abstract":"Single step synthesis of ZnO nanostructure thick films gas sensor has been adopted by using zinc metal as precursor. The ZnO was coated directly onto the alumina substrate by just spreading zinc powder using glass slides and then firing at 700°C for 1,2 and 3 hour and the film nicely adhere to the substrate. The surface morphology was studied using SEM which revealed the formation of different structures such as tetrapods, nanowires and porous structure onto the substrate. The crystal structure of ZnO was observed through X-ray diffraction to be hexagonal wurzite but containing small amount of zinc. UV Absorption spectroscopy shows the blue shift in the wavelength than the bulk ZnO, while blue emission is observed Photoluminescence Spectroscopy with the defect states at the near band edge. Also Raman Spectroscopy was performed in order to study the vibrational modes of ZnO nanostructures in the wavelength range of 200–1100nm. Thus prepared ZnO thick films were tested for 50–150ppm of CO gas in static chamber of volume 24 liters.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"42 1","pages":"361-364"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76590973","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260928
A. Jain, P. Anees, Roshan Tamang, N. Pendyala, A. Banerjee
Infrared (IR) detection in wavelength ranging from 3µm to 18µm has been a subject of extensive research due to its key role in commercial, defense and space applications. Infrared detectors require cryogenic cooling for their operation. First generation IR imaging systems used discrete element detectors operating in whiskbroom scanning mode from geostationary platform. Due to very less interconnections and slow readout rates, these detectors can be easily characterized in lab vacuum Dewars using standard instrumentation. Second and third generation imaging systems use area array infrared detectors coupled with high performance read-out-integrated circuits (ROICs), known as focal plane array (FPA), to image wider areas at faster imaging rates [1]. In terrestrial applications, to facilitate characterization of large array IR detectors, an Integrated Detector Dewar Cooler Assembly (IDDCA) is essential whereby the FPA sits over the cold tip of an active cryo-cooler and the detector cooler assembly is vacuum sealed in a thermally isolated Dewar. Before integrating the FPA with cooler, the FPA needs to be characterized separately for assessing its usability in the imaging system. This imposes challenges for test engineers to develop an FPA characterization test bench meeting the operational requirements and testing of FPAs at cryogenic temperatures. This paper gives design details of an indigenously developed test bench to characterize electro-optical performance of infrared FPAs.
{"title":"Development of electro-optical characterization test bench for high performance infrared focal plane area array detectors","authors":"A. Jain, P. Anees, Roshan Tamang, N. Pendyala, A. Banerjee","doi":"10.1109/ISPTS.2012.6260928","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260928","url":null,"abstract":"Infrared (IR) detection in wavelength ranging from 3µm to 18µm has been a subject of extensive research due to its key role in commercial, defense and space applications. Infrared detectors require cryogenic cooling for their operation. First generation IR imaging systems used discrete element detectors operating in whiskbroom scanning mode from geostationary platform. Due to very less interconnections and slow readout rates, these detectors can be easily characterized in lab vacuum Dewars using standard instrumentation. Second and third generation imaging systems use area array infrared detectors coupled with high performance read-out-integrated circuits (ROICs), known as focal plane array (FPA), to image wider areas at faster imaging rates [1]. In terrestrial applications, to facilitate characterization of large array IR detectors, an Integrated Detector Dewar Cooler Assembly (IDDCA) is essential whereby the FPA sits over the cold tip of an active cryo-cooler and the detector cooler assembly is vacuum sealed in a thermally isolated Dewar. Before integrating the FPA with cooler, the FPA needs to be characterized separately for assessing its usability in the imaging system. This imposes challenges for test engineers to develop an FPA characterization test bench meeting the operational requirements and testing of FPAs at cryogenic temperatures. This paper gives design details of an indigenously developed test bench to characterize electro-optical performance of infrared FPAs.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"21 1","pages":"220-223"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74168907","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260890
R. Rashmi, S. Duttagupta, K. P. Ray, M. D. Pandey
Range detection and tracking of moisture plume in the microwave spectrum (L-band: 1–2 GHz) has been successfully achieved using compact sensors. Range detection is advantageous over point sensors due to its long range tracking capability as well as its immunity from adverse weather conditions. Hexagonal Microstrip antenna (HMSA) and its miniaturized shorter versions (4X) are investigated as potential sensor candidates. HMSA is modified by shorting along the zero field to yield Quarter Hexagonal Microstrip Antenna (QHMSA). QHMSA acts as a shorted 90° sectoral antenna. There is a size reduction by a factor of four without any significant change in resonant frequency. The sensing is based on the principle of loss in attenuation in the presence of moisture plume. As moisture is known to absorb microwave frequency, there is a reduction in S21 which is a measure of the device sensitivity. Effective aperture size of the antenna in compact shorted mode is reduced and accordingly the gain. Since loss in attenuation (S21) is unchanged even with reduced gain, the sensitivity to moisture and thereby sensor's performance remains unaffected. The frequency with an insignificant variation of about 2–3% and an enhanced bandwidth (∼ 60%) of the QHMSA over HMSA further adds to its sensitivity.
{"title":"Range detection of moisture plume with miniaturized microwave sensor","authors":"R. Rashmi, S. Duttagupta, K. P. Ray, M. D. Pandey","doi":"10.1109/ISPTS.2012.6260890","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260890","url":null,"abstract":"Range detection and tracking of moisture plume in the microwave spectrum (L-band: 1–2 GHz) has been successfully achieved using compact sensors. Range detection is advantageous over point sensors due to its long range tracking capability as well as its immunity from adverse weather conditions. Hexagonal Microstrip antenna (HMSA) and its miniaturized shorter versions (4X) are investigated as potential sensor candidates. HMSA is modified by shorting along the zero field to yield Quarter Hexagonal Microstrip Antenna (QHMSA). QHMSA acts as a shorted 90° sectoral antenna. There is a size reduction by a factor of four without any significant change in resonant frequency. The sensing is based on the principle of loss in attenuation in the presence of moisture plume. As moisture is known to absorb microwave frequency, there is a reduction in S21 which is a measure of the device sensitivity. Effective aperture size of the antenna in compact shorted mode is reduced and accordingly the gain. Since loss in attenuation (S21) is unchanged even with reduced gain, the sensitivity to moisture and thereby sensor's performance remains unaffected. The frequency with an insignificant variation of about 2–3% and an enhanced bandwidth (∼ 60%) of the QHMSA over HMSA further adds to its sensitivity.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"7 1","pages":"98-101"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74912589","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260888
U. Chatterjee, S. Duttagupta, M. Gandhi
Cu2ZnSnS4 (CZTS) thin films have been successfully deposited by non-vacuum, sol-gel process on Molybdenum (Mo) coated Soda Lime Glass (SLG) substrate. The Cu, Zn, and Sn liquid precursor ratios have been pre-determined so as to achieve a Cu poor (23%) and Zn (14%) rich film with a goal to optimize absorber performance. A thermal annealing step (500°C, 60min) was performed in order to facilitate sulfurization from H2S source. The structural properties of CZTS film are determined by X-Ray Diffraction and Raman spectroscopy. We have confirmed deposition of a polycrystalline single phase (kesterite) CZTS thin film. Photoluminescence studies have been performed using an Yb:SYS laser at 534 nm and spanning room temperature (300K) and low temperature (8K) regimes in order to determine the optical band gap of the optimized CZTS absorber layer (1.24eV).
{"title":"Optical characterization of Cu2ZnSnS4 thin films prepared by non-vacuum process for photodetector application","authors":"U. Chatterjee, S. Duttagupta, M. Gandhi","doi":"10.1109/ISPTS.2012.6260888","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260888","url":null,"abstract":"Cu2ZnSnS4 (CZTS) thin films have been successfully deposited by non-vacuum, sol-gel process on Molybdenum (Mo) coated Soda Lime Glass (SLG) substrate. The Cu, Zn, and Sn liquid precursor ratios have been pre-determined so as to achieve a Cu poor (23%) and Zn (14%) rich film with a goal to optimize absorber performance. A thermal annealing step (500°C, 60min) was performed in order to facilitate sulfurization from H2S source. The structural properties of CZTS film are determined by X-Ray Diffraction and Raman spectroscopy. We have confirmed deposition of a polycrystalline single phase (kesterite) CZTS thin film. Photoluminescence studies have been performed using an Yb:SYS laser at 534 nm and spanning room temperature (300K) and low temperature (8K) regimes in order to determine the optical band gap of the optimized CZTS absorber layer (1.24eV).","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"5 1","pages":"92-95"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82147376","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260915
V. Kamble, A. Umarji
Fabrication of Cr2O3 thin films based chemiresistive type gas sensors by a novel and inexpensive method called Ultrasonic Nebulized Spray Pyrolysis of Aqueous Combustion Mixture is reported. The deposition of pure and adherent Cr2O3 thin films with tunable thickness is achieved by utilizing exothermic combustion reaction. The combustion mixture is made by adding stoichiometric amount of urea to the aqeous solution of chromium nitrate. The highly exothermic nature of combustion reaction leads to significant enhancement in crystallinity and porosity of the films as confirmed by x-ray diffraction and scanning electron microscopy, which makes them potential candidates for application in chemiresistive gas sensing. Further the gas sensing properties of chromium oxide films produced using combustion mixture is studied in presence of ethanol as a test gas. The response of the sensor was monitored in temperature range 200 – 375 °C. It is found that the operating temperature of chromium oxide films is considerably lowered (∼ 80 °C), when exposed to reducing gas like ethanol, compared to non-combustion films.
{"title":"Chromium oxide thin films by Ultrasonic Nebulized Spray Pyrolysis of Aqueous Combustion Mixture for gas sensing application","authors":"V. Kamble, A. Umarji","doi":"10.1109/ISPTS.2012.6260915","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260915","url":null,"abstract":"Fabrication of Cr2O3 thin films based chemiresistive type gas sensors by a novel and inexpensive method called Ultrasonic Nebulized Spray Pyrolysis of Aqueous Combustion Mixture is reported. The deposition of pure and adherent Cr2O3 thin films with tunable thickness is achieved by utilizing exothermic combustion reaction. The combustion mixture is made by adding stoichiometric amount of urea to the aqeous solution of chromium nitrate. The highly exothermic nature of combustion reaction leads to significant enhancement in crystallinity and porosity of the films as confirmed by x-ray diffraction and scanning electron microscopy, which makes them potential candidates for application in chemiresistive gas sensing. Further the gas sensing properties of chromium oxide films produced using combustion mixture is studied in presence of ethanol as a test gas. The response of the sensor was monitored in temperature range 200 – 375 °C. It is found that the operating temperature of chromium oxide films is considerably lowered (∼ 80 °C), when exposed to reducing gas like ethanol, compared to non-combustion films.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"PP 1","pages":"181-184"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84171383","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 : 2012-03-07DOI: 10.1109/ISPTS.2012.6260934
Geeta K. Sharma, Madhushree Bute, S. Jadkar, S. Gosavi
Properties of CaS:Ce were studied for its application in UV sensor. Luminescent CaS:Ce nanobelts were synthesized via solid state diffusion method. These nanobelts were embedded in PDMS (Polydimethylsiloxane) in order to increase chemical stability against moisture in the ambient surrounding. The XRD pattern of CaS:Ce and luminescent-PDMS was found to be in agreement with standard data. Particle size calculated using Debye Scherrer formula was found to be ∼50 nm. A slight variation in particle size and lattice parameter was observed after embedding in PDMS. Morphology of as prepared samples was analysed using SEM and nanobelts like structure was observed. This luminescent-PDMS films showed similar PL characteristics (excitation and emission) as that of CaS:Ce indicating that PDMS does not interact with CaS:Ce. The design for UV sensor using CaS:Ce in 200nm–400nm is proposed.
{"title":"Development of alkaline earth sulphide based nanophosphors embedded in PDMS polymer matrix for UV sensor applications","authors":"Geeta K. Sharma, Madhushree Bute, S. Jadkar, S. Gosavi","doi":"10.1109/ISPTS.2012.6260934","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260934","url":null,"abstract":"Properties of CaS:Ce were studied for its application in UV sensor. Luminescent CaS:Ce nanobelts were synthesized via solid state diffusion method. These nanobelts were embedded in PDMS (Polydimethylsiloxane) in order to increase chemical stability against moisture in the ambient surrounding. The XRD pattern of CaS:Ce and luminescent-PDMS was found to be in agreement with standard data. Particle size calculated using Debye Scherrer formula was found to be ∼50 nm. A slight variation in particle size and lattice parameter was observed after embedding in PDMS. Morphology of as prepared samples was analysed using SEM and nanobelts like structure was observed. This luminescent-PDMS films showed similar PL characteristics (excitation and emission) as that of CaS:Ce indicating that PDMS does not interact with CaS:Ce. The design for UV sensor using CaS:Ce in 200nm–400nm is proposed.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"30 1","pages":"236-239"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78193842","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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