The Experts below are selected from a list of 17613 Experts worldwide ranked by ideXlab platform
E Esposito - One of the best experts on this subject based on the ideXlab platform.
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assessment of air quality Microsensors versus reference methods the eunetair joint exercise
Atmospheric Environment, 2016Co-Authors: C Borrego, J Ginja, M Coutinho, C Ribeiro, Kostas Karatzas, T Sioumis, Nikos Katsifarakis, Konstantinos T Konstantinidis, S De Vito, E EspositoAbstract:The 1st EuNetAir Air Quality Joint Intercomparison Exercise organized in Aveiro (Portugal) from 13th–27th October 2014, focused on the evaluation and assessment of environmental gas, particulate matter (PM) and meteorological Microsensors, versus standard air quality reference methods through an experimental urban air quality monitoring campaign. The IDAD-Institute of Environment and Development Air Quality Mobile Laboratory was placed at an urban traffic location in the city centre of Aveiro to conduct continuous measurements with standard equipment and reference analysers for CO, NOx, O3, SO2, PM10, PM2.5, temperature, humidity, wind speed and direction, solar radiation and precipitation. The comparison of the sensor data generated by different microsensor-systems installed side-by-side with reference analysers, contributes to the assessment of the performance and the accuracy of microsensor-systems in a real-world context, and supports their calibration and further development. The overall performance of the sensors in terms of their statistical metrics and measurement profile indicates significant differences in the results depending on the platform and on the sensors considered. In terms of pollutants, some promising results were observed for O3 (r2: 0.12–0.77), CO (r2: 0.53–0.87), and NO2 (r2: 0.02–0.89). For PM (r2: 0.07–0.36) and SO2 (r2: 0.09–0.20) the results show a poor performance with low correlation coefficients between the reference and microsensor measurements. These field observations under specific environmental conditions suggest that the relevant microsensor platforms, if supported by the proper post processing and data modelling tools, have enormous potential for new strategies in air quality control.
Henry Baltes - One of the best experts on this subject based on the ideXlab platform.
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CMOS-based Microsensors and packaging
Sensors and Actuators A-physical, 2001Co-Authors: Henry Baltes, Oliver BrandAbstract:CMOS-based Microsensors benefit from well-established fabrication technologies and the possibility of on-chip circuitry. In these devices, added on-chip functionality can be implemented, such as calibration, self testing, and digital interfaces. The paper summarizes major technological approaches to CMOS-based Microsensors. Two packaged microsystems, namely a thermal imager and a chemical microsystem, fabricated using CMOS technology in combination with bulk-micromachining and thin film deposition, are reviewed. Finally, CMOS Microsensors for the characterization and optimization of ball bonding processes in the microelectronics packaging industry are presented.
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Search for extraterrestrial enantioenrichment by using chemical Microsensors.
Enantiomer, 2001Co-Authors: Andreas Hierlemann, Henry Baltes, Volker SchurigAbstract:The use of enantioselective chemical Microsensors is proposed for the search of extraterrestrial homochirality in space. The already established enantiomer-discrimination-capability of chemical sensors and the feasibility of quantitatively determining the enantiomeric composition of a target analyte are demonstrated. The benefits of applying modern microsensor technology are presented followed by some concepts and scenarios including how chemical Microsensors could be used in space.
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Application-specific sensor systems based on CMOS chemical Microsensors
Sensors and Actuators B: Chemical, 2000Co-Authors: Andreas Hierlemann, N. Kerness, Andreas Köll, D Lange, Oliver Brand, Christoph Hagleitner, Henry BaltesAbstract:We report on results achieved with three different types of polymer-coated chemical Microsensors fabricated in industrial CMOS technology followed by post-CMOS anisotropic etching and film deposition. The first and most extensively studied transducer is a microcapacitor sensitive to changes in dielectric properties of the polymer layer upon analyte absorption. An on-chip integrated ΣΔ-converter allows for detecting the minute capacitance changes. The second transducer is a resonant cantilever sensitive to predominantly mass changes. The cantilever is electrothermally excited; its vibrations are detected using a piezoresistive Wheatstone bridge. In analogy to acoustic wave devices, analyte absorption in the polymer causes resonance frequency shifts as a consequence of changes in the oscillating mass. The last transducer is a microcalorimeter consisting of a polymer-coated sensing thermopile and an uncoated reference thermopile each on micromachined membranes. The measurand is the absorption or desorption heat of organic volatiles in the polymer layer. The difference between the resulting thermovoltages is processed with an on-chip low-noise differential amplifier. Gas test measurements with all three transducer principles will be presented. The goal is to combine the three different transducer principles and vary the polymers in an array type structure to build a new generation of application-specific microsensor systems.
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Silicon Microsensors and microstructures
[Proceedings] 1992 IEEE International Symposium on Circuits and Systems, 1Co-Authors: Henry Baltes, Oliver Brand, T. Boltshauser, R. Lenggenhager, D. JaeggiAbstract:Microsensors and micromechanical structures realized by industrial CMOS technology with compatible postprocessing deposition or micromachining are presented. Fabrication methods are described for thermomechanical and other Microsensors realized by combining silicon micromachining with industrial CMOS or bipolar IC technologies. The procedure allows inexpensive batch fabrication of thermal and mechanical Microsensors with on-chip driving and signal conditioning circuitry. Examples include a capacitive moisture sensor, thermoelectric power and infrared sensors, and an acoustic transducer. >
C Borrego - One of the best experts on this subject based on the ideXlab platform.
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assessment of air quality Microsensors versus reference methods the eunetair joint exercise
Atmospheric Environment, 2016Co-Authors: C Borrego, J Ginja, M Coutinho, C Ribeiro, Kostas Karatzas, T Sioumis, Nikos Katsifarakis, Konstantinos T Konstantinidis, S De Vito, E EspositoAbstract:The 1st EuNetAir Air Quality Joint Intercomparison Exercise organized in Aveiro (Portugal) from 13th–27th October 2014, focused on the evaluation and assessment of environmental gas, particulate matter (PM) and meteorological Microsensors, versus standard air quality reference methods through an experimental urban air quality monitoring campaign. The IDAD-Institute of Environment and Development Air Quality Mobile Laboratory was placed at an urban traffic location in the city centre of Aveiro to conduct continuous measurements with standard equipment and reference analysers for CO, NOx, O3, SO2, PM10, PM2.5, temperature, humidity, wind speed and direction, solar radiation and precipitation. The comparison of the sensor data generated by different microsensor-systems installed side-by-side with reference analysers, contributes to the assessment of the performance and the accuracy of microsensor-systems in a real-world context, and supports their calibration and further development. The overall performance of the sensors in terms of their statistical metrics and measurement profile indicates significant differences in the results depending on the platform and on the sensors considered. In terms of pollutants, some promising results were observed for O3 (r2: 0.12–0.77), CO (r2: 0.53–0.87), and NO2 (r2: 0.02–0.89). For PM (r2: 0.07–0.36) and SO2 (r2: 0.09–0.20) the results show a poor performance with low correlation coefficients between the reference and microsensor measurements. These field observations under specific environmental conditions suggest that the relevant microsensor platforms, if supported by the proper post processing and data modelling tools, have enormous potential for new strategies in air quality control.
Camelia Stanciu-gavan - One of the best experts on this subject based on the ideXlab platform.
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New stochastic Microsensors based on oleamides
Electrochemistry Communications, 2015Co-Authors: Catalina Cioates Negut, Raluca-ioana Stefan-van Staden, Iuliana Moldoveanu, Eleonora-mihaela Ungureanu, Camelia Stanciu-gavanAbstract:Abstract Six oleamides: oleoylethanolamide, (Z)-N-[(1S)-2-hydroxy-1-(phenylmethyl)ethyl]-9octadecenamide, N-phenethyloleamide, N-[2-(4-methoxyphenyl)ethyl]oleamide, N-[1]naphthyloleamide, N-cyclohexyloleamide were synthesized and used as modifiers for the design of new stochastic Microsensors based on graphite paste. Carcinoembryonic antigen (CEA) was used as a model analyte to prove the stochastic behavior of the Microsensors. CEA was determined directly from whole blood samples with recoveries higher than 94.00%, favorizing pattern recognition of CEA in whole blood samples. The most sensitive stochastic microsensor was the one based on the physical immobilization of N-[2-(4-methoxyphenyl)ethyl]oleamide in graphite paste.
Raluca-ioana Stefan-van Staden - One of the best experts on this subject based on the ideXlab platform.
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Stochastic Microsensors for the assessment of DNA damage in cancer
Analytical biochemistry, 2020Co-Authors: Raluca-ioana Stefan-van Staden, Liliana-roxana Balahura, Catalina Cioates-negut, Hassan Y. Aboul-eneinAbstract:Three stochastic Microsensors based on graphite powder modified with three different oleamides: N-(2-piperidin-1-ylethyl)oleamide, N-(3,4-dihydroxyphenethyl)oleamide and N-(2-morpholinoethyl)oleamide, were designed, characterized, and used to assess DNA damage in cancer by assaying two biomarkers namely 8-nitroguanine and 8-hydroxy-2'-deoxyguanosine. The two biomarkers were determined from urine and whole blood samples. The characterization of the Microsensors was done at two pHs 7.40 and 3.00. The best microsensor for the simultaneous determination of biomarkers in whole blood and urine samples was the one based on the graphite paste modified with N-(3,4-dihydroxyphenethyl)oleamide. The results indicated that the proposed Microsensors can be reliably used for pattern recognition and quantitative determination of 8-nitroguanine and 8-hydroxy-2'-deoxyguanosine in whole blood and urine, and accordingly, for the assessment of DNA damage in cancer patients.
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New stochastic Microsensors based on oleamides
Electrochemistry Communications, 2015Co-Authors: Catalina Cioates Negut, Raluca-ioana Stefan-van Staden, Iuliana Moldoveanu, Eleonora-mihaela Ungureanu, Camelia Stanciu-gavanAbstract:Abstract Six oleamides: oleoylethanolamide, (Z)-N-[(1S)-2-hydroxy-1-(phenylmethyl)ethyl]-9octadecenamide, N-phenethyloleamide, N-[2-(4-methoxyphenyl)ethyl]oleamide, N-[1]naphthyloleamide, N-cyclohexyloleamide were synthesized and used as modifiers for the design of new stochastic Microsensors based on graphite paste. Carcinoembryonic antigen (CEA) was used as a model analyte to prove the stochastic behavior of the Microsensors. CEA was determined directly from whole blood samples with recoveries higher than 94.00%, favorizing pattern recognition of CEA in whole blood samples. The most sensitive stochastic microsensor was the one based on the physical immobilization of N-[2-(4-methoxyphenyl)ethyl]oleamide in graphite paste.