Pub Date : 2015-09-03DOI: 10.1109/ISPTS.2015.7220142
Chang Hyo Kim, Bo-Hye Kim, K. Yang
Graphene/carbon composite nanofibers (GCNFs) with attached TiO2 nanoparticles (TiO2-GCNF) were prepared, and their photocatalytic degradation ability under visible light irradiation was assessed. They were characterized using scanning and transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet-visible diffuse spectroscopy. The results suggest that the presence of graphene embedded in the composite fibers prevents TiO2 particle agglomeration and aids the uniform dispersion of TiO2 on the fibers (Fig.1). In the photo-degradation of methylene blue, a significant increase in the reaction rate was observed with TiO2-GCNF materials under visible light. This increase is due to the high migration efficiency of photo-induced electrons and the inhibition of charge-carrier recombination due to the electronic interaction between TiO2 and graphene [1,2](Fig.2). The TiO2-GCNF materials could be used for multiple degradation cycles without a decrease in photocatalytic activity.
{"title":"IT02. TiO2 nanoparticles loaded on graphene/carbon composite nanofibers by electrospinning for increased photocatalysis","authors":"Chang Hyo Kim, Bo-Hye Kim, K. Yang","doi":"10.1109/ISPTS.2015.7220142","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220142","url":null,"abstract":"Graphene/carbon composite nanofibers (GCNFs) with attached TiO2 nanoparticles (TiO2-GCNF) were prepared, and their photocatalytic degradation ability under visible light irradiation was assessed. They were characterized using scanning and transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet-visible diffuse spectroscopy. The results suggest that the presence of graphene embedded in the composite fibers prevents TiO2 particle agglomeration and aids the uniform dispersion of TiO2 on the fibers (Fig.1). In the photo-degradation of methylene blue, a significant increase in the reaction rate was observed with TiO2-GCNF materials under visible light. This increase is due to the high migration efficiency of photo-induced electrons and the inhibition of charge-carrier recombination due to the electronic interaction between TiO2 and graphene [1,2](Fig.2). The TiO2-GCNF materials could be used for multiple degradation cycles without a decrease in photocatalytic activity.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"12 1","pages":"II-III"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84178514","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 : 2015-09-03DOI: 10.1109/ISPTS.2015.7220107
A. Kanade, A. Shaligram
The present work represents a non contact, machine vision based method to estimate ripeness level of Guava fruit. The fruit under test is classified as green, ripe, overripe and spoiled using a web camera based computer vision system. This simple method uses a combination of digital web camera; computer and indigenously developed GUI based software to measure and analyze the surface color of the fruits. The images of the fruit under test are grabbed and displayed on computer screen. Quantitative information such as RGB color distribution, CIE1931 standard based tristimulus values, Chromaticity coordinates and averages (in terms of L_, a_ and b_ values) are computed. The developed software appropriately analyzes the color of the fruit skin and is also capable of classifying the ripening stage of the guava fruit as green, ripe, overripe and spoiled using Principal Component Analysis (PCA). Distinct clusters for the ripeness classes were readily observed in the PCA scatter plot. An Artificial Neural Network (ANN) was also used for a better prediction for unknown samples.
{"title":"Development of machine vision based system for classification of Guava fruits on the basis of CIE1931 chromaticity coordinates","authors":"A. Kanade, A. Shaligram","doi":"10.1109/ISPTS.2015.7220107","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220107","url":null,"abstract":"The present work represents a non contact, machine vision based method to estimate ripeness level of Guava fruit. The fruit under test is classified as green, ripe, overripe and spoiled using a web camera based computer vision system. This simple method uses a combination of digital web camera; computer and indigenously developed GUI based software to measure and analyze the surface color of the fruits. The images of the fruit under test are grabbed and displayed on computer screen. Quantitative information such as RGB color distribution, CIE1931 standard based tristimulus values, Chromaticity coordinates and averages (in terms of L_, a_ and b_ values) are computed. The developed software appropriately analyzes the color of the fruit skin and is also capable of classifying the ripening stage of the guava fruit as green, ripe, overripe and spoiled using Principal Component Analysis (PCA). Distinct clusters for the ripeness classes were readily observed in the PCA scatter plot. An Artificial Neural Network (ANN) was also used for a better prediction for unknown samples.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"75 1","pages":"177-180"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79493933","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 : 2015-09-03DOI: 10.1109/ISPTS.2015.7220112
Pramod Kori, Vipul Dhongade, R. Aiyer
The paper presents Tin oxide (SnO2) based low cost, high temperature operable resistive type low humidity (10-20%RH) sensor. SnO2 thin films were prepared by spin coating 50 μl of synthesized (SnCl2) solution on alumina substrate (1.44 cm2). Material characterization of the synthesized material was carried out using UV-Visible, SEM and XRD. To get films of higher thickness they were coated from 1 to 4 layers and annealed in the furnace at an optimized temperature of 550°C for ~1 hour. Obtained SnO2 thin films were tested for change in resistance w.r.t. humidity from 10 to 20% RH at 200°C and 300°C to be used in boilers. Samples have low hysteresis (~12%) with recovery time of about ~10 sec. They have shown good repeatability (5%). The sensitivity of tested films was found to increase with respect to number of SnO2 layers. Sensitivity of 2 layered film operating at 200°C is 146 Ω/%RH and that of 4 layered film is 314 Ω/%RH, likewise at 300 °C the sensitivity of the films are 165 Ω/%RH and 323 Ω/%RH respectively.
{"title":"High temperature operable low humidity (10 to 20%RH) sensor using spin coated SnO2 thin films","authors":"Pramod Kori, Vipul Dhongade, R. Aiyer","doi":"10.1109/ISPTS.2015.7220112","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220112","url":null,"abstract":"The paper presents Tin oxide (SnO<sub>2</sub>) based low cost, high temperature operable resistive type low humidity (10-20%RH) sensor. SnO<sub>2</sub> thin films were prepared by spin coating 50 μl of synthesized (SnCl<sub>2</sub>) solution on alumina substrate (1.44 cm<sup>2</sup>). Material characterization of the synthesized material was carried out using UV-Visible, SEM and XRD. To get films of higher thickness they were coated from 1 to 4 layers and annealed in the furnace at an optimized temperature of 550°C for ~1 hour. Obtained SnO<sub>2</sub> thin films were tested for change in resistance w.r.t. humidity from 10 to 20% RH at 200°C and 300°C to be used in boilers. Samples have low hysteresis (~12%) with recovery time of about ~10 sec. They have shown good repeatability (5%). The sensitivity of tested films was found to increase with respect to number of SnO<sub>2</sub> layers. Sensitivity of 2 layered film operating at 200°C is 146 Ω/%RH and that of 4 layered film is 314 Ω/%RH, likewise at 300 °C the sensitivity of the films are 165 Ω/%RH and 323 Ω/%RH respectively.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"35 1","pages":"200-203"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85425997","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.2015.7220081
R. Shashidhar, B. Angadi, H. D. ChandraShekar, L. Murthy, K. K. Rao
Titanium oxide films were prepared on ITO coated glass substrates at 350 °C using titanium (IV) isopropoxide, acetylacetonate and absolute ethanol as precursors by spray pyrolysis technique. The prepared films were characterized by X-ray diffraction, Scanning electron microscope, Fourier transform infrared spectroscopy and Energy dispersive analysis of X-rays. Estimated optical and electrical parameters such as refractive index, porosity, dielectric constant, energy band gap, carrier concentration, mobility by UV-Vis spectrophotometer, Hall effect and Van der pauw techniques were found to vary with ethanol volumetric concentration of 22.5-23. The observed increase in porosity from 45-59% facilitates the adsorption of water molecules inside films. The capacitance and resistance of metal-insulator-semiconductor structure were found to vary between 1.08-3.48 nF and 436-15 kΩ with increase in relative humidity. The fabricated humidity sensor found to posses 4s criterion such as sensitivity, stability and response-recovery times as 180%, ± 10% and 58-106 s, respectively.
{"title":"Effect of ethanol concentration on the porosity of spray pyrolyzed TiO2 films and their utility as humidity sensor","authors":"R. Shashidhar, B. Angadi, H. D. ChandraShekar, L. Murthy, K. K. Rao","doi":"10.1109/ISPTS.2015.7220081","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220081","url":null,"abstract":"Titanium oxide films were prepared on ITO coated glass substrates at 350 °C using titanium (IV) isopropoxide, acetylacetonate and absolute ethanol as precursors by spray pyrolysis technique. The prepared films were characterized by X-ray diffraction, Scanning electron microscope, Fourier transform infrared spectroscopy and Energy dispersive analysis of X-rays. Estimated optical and electrical parameters such as refractive index, porosity, dielectric constant, energy band gap, carrier concentration, mobility by UV-Vis spectrophotometer, Hall effect and Van der pauw techniques were found to vary with ethanol volumetric concentration of 22.5-23. The observed increase in porosity from 45-59% facilitates the adsorption of water molecules inside films. The capacitance and resistance of metal-insulator-semiconductor structure were found to vary between 1.08-3.48 nF and 436-15 kΩ with increase in relative humidity. The fabricated humidity sensor found to posses 4s criterion such as sensitivity, stability and response-recovery times as 180%, ± 10% and 58-106 s, respectively.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"129 1","pages":"52-58"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75761501","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.2015.7220116
P. Bansode, K. Makhija, S. Gangal, R. Aiyer
Measurement of dielectric constant is important because it provides the electrical characteristics of the material which prove useful in research and development fields. A new technique to evaluate the dielectric constant or permittivity of the homogeneous dielectric material using a simple microstrip patch antenna has been developed in present work. The Microstrip patch antenna having resonant frequency of 2.4GHz is simulated and fabricated on FR4 dielectric material having thickness 1.6mm. The antenna, when tested on vector network analyzer shows resonant frequency at 2.401 GHz and reflection coefficient around -19 dB. The values of change in frequency and lS11l parameter are measured by placing Alumina Substrate as overlay on the patch antenna. Readings are taken by changing the thickness of overlay and by moving it over the width of the patch antenna. From these results empirical formulae for evaluating the dielectric constant of Alumina substrate are suggested.
{"title":"Non-destructive measurement of dielectric constant using a 2.4 GHz microstrip patch antenna","authors":"P. Bansode, K. Makhija, S. Gangal, R. Aiyer","doi":"10.1109/ISPTS.2015.7220116","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220116","url":null,"abstract":"Measurement of dielectric constant is important because it provides the electrical characteristics of the material which prove useful in research and development fields. A new technique to evaluate the dielectric constant or permittivity of the homogeneous dielectric material using a simple microstrip patch antenna has been developed in present work. The Microstrip patch antenna having resonant frequency of 2.4GHz is simulated and fabricated on FR4 dielectric material having thickness 1.6mm. The antenna, when tested on vector network analyzer shows resonant frequency at 2.401 GHz and reflection coefficient around -19 dB. The values of change in frequency and lS11l parameter are measured by placing Alumina Substrate as overlay on the patch antenna. Readings are taken by changing the thickness of overlay and by moving it over the width of the patch antenna. From these results empirical formulae for evaluating the dielectric constant of Alumina substrate are suggested.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"9 1","pages":"219-223"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80230309","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.2015.7220154
C. Suri
Nanoparticles conjugated with biomolecules are promising building blocks for assembly into nanostructured functional materials for developing biomarker platforms because of their size dependent optical and electrical properties. Nanoparticles and nanodevices enable study of a wide range of biological phenomena extending from biomolecular interactions such as protein-protein, antibody-antigen or DNA protein interactions mapping to early diagnosis of bacterial, fungal or viral diseases in plants. Recent advances in materials science, in particular the development of functionalized nanoparticles, united with advances in molecular imaging research, provide the impetus for the present explosion in nanobiotechnology imaging and diagnosis research. Key to those advances is the emergence of functionalized nanoparticles, particularly inorganic nanoparticles, semiconductor nanomaterials (QDs) that can be targeted specifically to antibody receptors, enzymes and other molecules of biological importance that can interact at the cellular level. Also, over the last few years there has been a great interest of high-resolution devices for in vivo imaging in animal models of human disease and high-throughput, i.e., microarray and combinatorial, techniques for generating new diagnostic and therapeutic targets and probes. Here, we discuss some new strategies in developing functionalized inorganic or semiconductor based nanomaterials for early disease diagnosis.
{"title":"IT14. Nanophotonics for biological sensing: New tools for disease management","authors":"C. Suri","doi":"10.1109/ISPTS.2015.7220154","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220154","url":null,"abstract":"Nanoparticles conjugated with biomolecules are promising building blocks for assembly into nanostructured functional materials for developing biomarker platforms because of their size dependent optical and electrical properties. Nanoparticles and nanodevices enable study of a wide range of biological phenomena extending from biomolecular interactions such as protein-protein, antibody-antigen or DNA protein interactions mapping to early diagnosis of bacterial, fungal or viral diseases in plants. Recent advances in materials science, in particular the development of functionalized nanoparticles, united with advances in molecular imaging research, provide the impetus for the present explosion in nanobiotechnology imaging and diagnosis research. Key to those advances is the emergence of functionalized nanoparticles, particularly inorganic nanoparticles, semiconductor nanomaterials (QDs) that can be targeted specifically to antibody receptors, enzymes and other molecules of biological importance that can interact at the cellular level. Also, over the last few years there has been a great interest of high-resolution devices for in vivo imaging in animal models of human disease and high-throughput, i.e., microarray and combinatorial, techniques for generating new diagnostic and therapeutic targets and probes. Here, we discuss some new strategies in developing functionalized inorganic or semiconductor based nanomaterials for early disease diagnosis.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"20 1","pages":"XXX-XXX"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81530935","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.2015.7220072
Gopa Kumar, B. Suhasini, P. Venkatesh, B. P. Reddy, R. Ramanarayanan
Molten salt level measurement in the process vessels of pyrochemical reprocessing of spent metallic fuels is one of the key process parameters. Level measurement of hygroscopic and high temperature salts is a challenging task. It is proposed to use an ultrasonic based level measurement. The Commercially available ultra sonic level indicators have the limitations such as their physical dimensions, working environment, and adaptability for inert atmosphere glove boxes. Customization of molten salt level measurement technique using ultrasonic sensors in inert atmosphere glove boxes has been developed. The working principle, design concept, fabrication techniques and results have been discussed in this paper.
{"title":"Ultrasonic based instrumentation for measuring hygroscopic, high temperature molten salt level in an electrorefiner inside inert atmosphere glove boxes","authors":"Gopa Kumar, B. Suhasini, P. Venkatesh, B. P. Reddy, R. Ramanarayanan","doi":"10.1109/ISPTS.2015.7220072","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220072","url":null,"abstract":"Molten salt level measurement in the process vessels of pyrochemical reprocessing of spent metallic fuels is one of the key process parameters. Level measurement of hygroscopic and high temperature salts is a challenging task. It is proposed to use an ultrasonic based level measurement. The Commercially available ultra sonic level indicators have the limitations such as their physical dimensions, working environment, and adaptability for inert atmosphere glove boxes. Customization of molten salt level measurement technique using ultrasonic sensors in inert atmosphere glove boxes has been developed. The working principle, design concept, fabrication techniques and results have been discussed in this paper.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"52 1","pages":"15-18"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76266166","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.2015.7220108
Poonam D. Mahapure, S. Gosavi, R. Aiyer
The nAg/PVP and nAg/PVA composites were synthesized by using chemical reduction method. The neat Poly vinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) at different concentrations and their nano metal polymer composites were studied for electrical humidity sensing, ranging from 5-90% RH. The neat polymers and their composites were coated on ceramic rods having built in electrodes by drop casting method. With increase in concentration, there is an increase in resistance by an order of magnitude. The PVA and PVP at 0.1% wt of polymer show large change in magnitude of resistance with humidity in the range 5-90 %RH hence is used for further studied for electrical humidity sensing. The formation of nAg/polymer composite is decided from data of UV-Visible. The nAg/polymer composites are characterized by UV-Visible, DLS and FTIR (at 5% and 85% RH). Samples of nAg/0.1% PVP show good sensitivity over a wide range of humidity (5-90% RH) as compared to nAg/0.1% PVA. The nAg/0.1% PVP has fast response and recovery, good repeatability and reproducibility as compared to nAg/0.1% PVA.
{"title":"Studies on PVP, PVA and their nAg composites based humidity sensors","authors":"Poonam D. Mahapure, S. Gosavi, R. Aiyer","doi":"10.1109/ISPTS.2015.7220108","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220108","url":null,"abstract":"The nAg/PVP and nAg/PVA composites were synthesized by using chemical reduction method. The neat Poly vinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) at different concentrations and their nano metal polymer composites were studied for electrical humidity sensing, ranging from 5-90% RH. The neat polymers and their composites were coated on ceramic rods having built in electrodes by drop casting method. With increase in concentration, there is an increase in resistance by an order of magnitude. The PVA and PVP at 0.1% wt of polymer show large change in magnitude of resistance with humidity in the range 5-90 %RH hence is used for further studied for electrical humidity sensing. The formation of nAg/polymer composite is decided from data of UV-Visible. The nAg/polymer composites are characterized by UV-Visible, DLS and FTIR (at 5% and 85% RH). Samples of nAg/0.1% PVP show good sensitivity over a wide range of humidity (5-90% RH) as compared to nAg/0.1% PVA. The nAg/0.1% PVP has fast response and recovery, good repeatability and reproducibility as compared to nAg/0.1% PVA.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"73 1","pages":"181-186"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82285962","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.2015.7220151
Sung Ha Park
Nanobiotechnology has evolved into a unique interdisciplinary field involving physics, materials science, chemistry, biology, computer science, and multiple enginering fields. Likewise, DNA nanotechnology is a quickly developing field with esentialy no overwhelming technical dificultiesinhibitngprogres toward designing and fabricating new shapes of DNA nanostructures in al dimensions. In this field, researchers create artificial DNA sequences to self-asemble into target molecular nanostructures. The welunderstod Watson-Crick base-pairing rules are used to encode asembly instructions directly into the DNA molecules which provide basic building blocks for constructing functionalized nanostructures with two major features: self-asembly and self-align. In this talk, we present on self-asembled various DNA nanostructures. 1D and 2D periodicalypaterned nanostructures utilzing several distinct DNA motifs such as cros tiles, double crosover tiles as wel as single-stranded tiles wil be discused with unique design schemes and characteristics. We also discus new development of DNA fabrication methods such as Angle Control Scheme, Surface Asisted Growth and Dry & Wet Method. At he end of the talk, we adresaplications of DNA nanotechnology which wil show feasibilty to construct various physical devices and biological/chemical sensors with DNA nanostructures[1,2].
{"title":"IT11. Physical and biological aplications using self-asembled DNA nanostructures","authors":"Sung Ha Park","doi":"10.1109/ISPTS.2015.7220151","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220151","url":null,"abstract":"Nanobiotechnology has evolved into a unique interdisciplinary field involving physics, materials science, chemistry, biology, computer science, and multiple enginering fields. Likewise, DNA nanotechnology is a quickly developing field with esentialy no overwhelming technical dificultiesinhibitngprogres toward designing and fabricating new shapes of DNA nanostructures in al dimensions. In this field, researchers create artificial DNA sequences to self-asemble into target molecular nanostructures. The welunderstod Watson-Crick base-pairing rules are used to encode asembly instructions directly into the DNA molecules which provide basic building blocks for constructing functionalized nanostructures with two major features: self-asembly and self-align. In this talk, we present on self-asembled various DNA nanostructures. 1D and 2D periodicalypaterned nanostructures utilzing several distinct DNA motifs such as cros tiles, double crosover tiles as wel as single-stranded tiles wil be discused with unique design schemes and characteristics. We also discus new development of DNA fabrication methods such as Angle Control Scheme, Surface Asisted Growth and Dry & Wet Method. At he end of the talk, we adresaplications of DNA nanotechnology which wil show feasibilty to construct various physical devices and biological/chemical sensors with DNA nanostructures[1,2].","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"49 1","pages":"XXVI-XXVI"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86833353","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.2015.7220134
S. A. Sampson, Suresh VaijnathPanchal, K. Date, Suwarna Datar
A methanol sensor based on polymer functionalized Quartz Tuning Fork (QTF) has been demonstrated. Thin polymer wires, formed of different polymers and with different additives, were used to form bridges between the two tines of the QTFs. The mechanical properties of the polymer wires, as well as the effective mass of the wires determine the resonant frequency of the QTF sensor. The interaction of the polymer wires with the analyte vapors caused a shift in resonant frequency of the sensor and this shift in frequency, as well as the quantum of shift was measured to determine the selectivity and sensitivity of the sensor to the analytes. The effect of ethanol and methanol vapors on the QTF sensor was observed and the dependence of the selectivity and sensitivity of the sensor on the presence of various polymers as well as the type of polymer loading is discussed.
{"title":"QTF based methanol sensors","authors":"S. A. Sampson, Suresh VaijnathPanchal, K. Date, Suwarna Datar","doi":"10.1109/ISPTS.2015.7220134","DOIUrl":"https://doi.org/10.1109/ISPTS.2015.7220134","url":null,"abstract":"A methanol sensor based on polymer functionalized Quartz Tuning Fork (QTF) has been demonstrated. Thin polymer wires, formed of different polymers and with different additives, were used to form bridges between the two tines of the QTFs. The mechanical properties of the polymer wires, as well as the effective mass of the wires determine the resonant frequency of the QTF sensor. The interaction of the polymer wires with the analyte vapors caused a shift in resonant frequency of the sensor and this shift in frequency, as well as the quantum of shift was measured to determine the selectivity and sensitivity of the sensor to the analytes. The effect of ethanol and methanol vapors on the QTF sensor was observed and the dependence of the selectivity and sensitivity of the sensor on the presence of various polymers as well as the type of polymer loading is discussed.","PeriodicalId":6520,"journal":{"name":"2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)","volume":"04 1","pages":"303-306"},"PeriodicalIF":0.0,"publicationDate":"2015-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88357789","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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