The Experts below are selected from a list of 2355 Experts worldwide ranked by ideXlab platform
R K Mondal - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotube functionalization and radiation induced enhancements in the sensitivity of standalone Chemiresistors for sensing volatile organic compounds
ACS Applied Nano Materials, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Chemical stress-induced alterations in the number-density and the architecture of conducting interjunctions impart chemiresistivity in conducting polymer composites (CPCs). Herein, marked enhancement in the chemiresistive response of CPCs is reported by maneuvering interfacial and percolation characteristics of carbon nanotube (CNT) based Chemiresistors, through CNT functional group variation and high energy radiation exposure. Unfunctionalized (CNT-UF), hydroxyl functionalized (CNT-OH), amine functionalized (CNT-NH2), and carboxyl functionalized (CNT-COOH) carbon nanotubes, polydimethylsiloxane (PDMS), and γ radiation were used in different combinations to prepare PDMS/CNT Chemiresistors. Even at the same ϕCNT, PDMS/CNT-NH2 Chemiresistors exhibited significantly milder response against toluene vapors than PDMS/CNT-COOH Chemiresistors, whereas PDMS/CNT-OH Chemiresistors were unresponsive due to poor nanotube dispersion and low electrical conductivity. PDMS/CNT-COOH Chemiresistors had the lowest surface en...
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network density tailored standalone flexible fluorocarbon elastomer nanocarbon black Chemiresistors for 2 propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
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Network density tailored standalone-flexible fluorocarbon elastomer/nanocarbon black Chemiresistors for 2-propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra Kumar, Lalit VarshneyAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
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novel hybrid nanocarbons poly dimethylsiloxane composites based Chemiresistors for real time detection of hazardous aromatic hydrocarbons
Carbon, 2016Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Lalit VarshneyAbstract:Abstract Hybrid nanocarbons have been reported to have synergetic advantages in several mechanical and electrical applications. However, little is understood how two geometrically different nanocarbons can affect the response of a chemiresistive sensor. The study reports development of poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT) and nanocarbon black based novel chemiresistive sensors through a solvent free route. These PDMS based sensors demonstrated high sensitivity and reversible response against benzene, toluene, ethyl benzene and xylene (BTEX) under dynamic flow as well as under static vapour conditions. It was found that the sensing response had a strong correlation with the BTEX-PDMS interaction parameters ( χ 12 ). However, such dependence was not observed at 3 wt% loading of CNT, due to CNT induced changes in the diffusion behavior of BTEX. CNT loading affected detection of each analyte differently; though, the principle component analysis using an array of four Chemiresistors with different CNT content demonstrated distinct pattern only for benzene. Intriguingly, the sensitivity and the temperature coefficient of resistance of Chemiresistors decreased; whereas, the detection range increased considerably with addition of CNT.
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Novel hybrid nanocarbons/poly(dimethylsiloxane) composites based Chemiresistors for real time detection of hazardous aromatic hydrocarbons
Carbon, 2016Co-Authors: R K Mondal, Y.k. Bhardwaj, Kumar A. Dubey, Lalit VarshneyAbstract:Abstract Hybrid nanocarbons have been reported to have synergetic advantages in several mechanical and electrical applications. However, little is understood how two geometrically different nanocarbons can affect the response of a chemiresistive sensor. The study reports development of poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT) and nanocarbon black based novel chemiresistive sensors through a solvent free route. These PDMS based sensors demonstrated high sensitivity and reversible response against benzene, toluene, ethyl benzene and xylene (BTEX) under dynamic flow as well as under static vapour conditions. It was found that the sensing response had a strong correlation with the BTEX-PDMS interaction parameters ( χ 12 ). However, such dependence was not observed at 3 wt% loading of CNT, due to CNT induced changes in the diffusion behavior of BTEX. CNT loading affected detection of each analyte differently; though, the principle component analysis using an array of four Chemiresistors with different CNT content demonstrated distinct pattern only for benzene. Intriguingly, the sensitivity and the temperature coefficient of resistance of Chemiresistors decreased; whereas, the detection range increased considerably with addition of CNT.
Jose Savio Melo - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotube functionalization and radiation induced enhancements in the sensitivity of standalone Chemiresistors for sensing volatile organic compounds
ACS Applied Nano Materials, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Chemical stress-induced alterations in the number-density and the architecture of conducting interjunctions impart chemiresistivity in conducting polymer composites (CPCs). Herein, marked enhancement in the chemiresistive response of CPCs is reported by maneuvering interfacial and percolation characteristics of carbon nanotube (CNT) based Chemiresistors, through CNT functional group variation and high energy radiation exposure. Unfunctionalized (CNT-UF), hydroxyl functionalized (CNT-OH), amine functionalized (CNT-NH2), and carboxyl functionalized (CNT-COOH) carbon nanotubes, polydimethylsiloxane (PDMS), and γ radiation were used in different combinations to prepare PDMS/CNT Chemiresistors. Even at the same ϕCNT, PDMS/CNT-NH2 Chemiresistors exhibited significantly milder response against toluene vapors than PDMS/CNT-COOH Chemiresistors, whereas PDMS/CNT-OH Chemiresistors were unresponsive due to poor nanotube dispersion and low electrical conductivity. PDMS/CNT-COOH Chemiresistors had the lowest surface en...
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network density tailored standalone flexible fluorocarbon elastomer nanocarbon black Chemiresistors for 2 propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
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Network density tailored standalone-flexible fluorocarbon elastomer/nanocarbon black Chemiresistors for 2-propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra Kumar, Lalit VarshneyAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
Horn-jiunn Sheen - One of the best experts on this subject based on the ideXlab platform.
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A vapor response mechanism study of surface-modified single-walled carbon nanotubes coated Chemiresistors and quartz crystal microbalance sensor arrays
Talanta, 2015Co-Authors: Hung Ling Lu, Wei-cheng Tian, Chia-jung Lu, Horn-jiunn SheenAbstract:This paper compares the selectivity and discusses the response mechanisms of various surface-modified, single-walled carbon nanotube (SWCNT)-coated sensor arrays for the detection of volatile organic compounds (VOCs). Two types of sensor platforms, chemiresistor and quartz crystal microbalance (QCM), were used to probe the resistance changes and absorption masses during vapor sensing. Four sensing materials were used in this comparison study: pristine, acidified, esterified, and surfactant (sodium dodecyl sulfate, SDS)-coated SWCNTs. SWCNT-coated QCMs reached the response equilibrium faster than the Chemiresistors did, which revealed a delay diffusion behavior at the inter-tube junction. In addition, the calibration lines for QCMs were all linear, but the Chemiresistors showed curvature calibration lines which indicated less effectiveness of swelling at high concentrations. While the sorption of vapor molecules caused an increase in the resistance for most SWCNTs due to the swelling, the acidified SWCNTs showed no responses to nonpolar vapors and a negative response to hydrogen bond acceptors. This discovery provided insight into the inter-tube interlocks and conductivity modulation of acidified SWCNTs via a hydrogen bond. The results in this study provide a stepping-stone for further understanding of the mechanisms behind the vapor selectivity of surface-modified SWCNT sensor arrays. © 2014 Elsevier B.V.
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a vapor response mechanism study of surface modified single walled carbon nanotubes coated Chemiresistors and quartz crystal microbalance sensor arrays
Talanta, 2015Co-Authors: Hung Ling Lu, Wei-cheng Tian, Chia-jung Lu, Horn-jiunn SheenAbstract:Abstract This paper compares the selectivity and discusses the response mechanisms of various surface-modified, single-walled carbon nanotube (SWCNT)-coated sensor arrays for the detection of volatile organic compounds (VOCs). Two types of sensor platforms, chemiresistor and quartz crystal microbalance (QCM), were used to probe the resistance changes and absorption masses during vapor sensing. Four sensing materials were used in this comparison study: pristine, acidified, esterified, and surfactant (sodium dodecyl sulfate, SDS)-coated SWCNTs. SWCNT-coated QCMs reached the response equilibrium faster than the Chemiresistors did, which revealed a delay diffusion behavior at the inter-tube junction. In addition, the calibration lines for QCMs were all linear, but the Chemiresistors showed curvature calibration lines which indicated less effectiveness of swelling at high concentrations. While the sorption of vapor molecules caused an increase in the resistance for most SWCNTs due to the swelling, the acidified SWCNTs showed no responses to nonpolar vapors and a negative response to hydrogen bond acceptors. This discovery provided insight into the inter-tube interlocks and conductivity modulation of acidified SWCNTs via a hydrogen bond. The results in this study provide a stepping-stone for further understanding of the mechanisms behind the vapor selectivity of surface-modified SWCNT sensor arrays.
Y.k. Bhardwaj - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotube functionalization and radiation induced enhancements in the sensitivity of standalone Chemiresistors for sensing volatile organic compounds
ACS Applied Nano Materials, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Chemical stress-induced alterations in the number-density and the architecture of conducting interjunctions impart chemiresistivity in conducting polymer composites (CPCs). Herein, marked enhancement in the chemiresistive response of CPCs is reported by maneuvering interfacial and percolation characteristics of carbon nanotube (CNT) based Chemiresistors, through CNT functional group variation and high energy radiation exposure. Unfunctionalized (CNT-UF), hydroxyl functionalized (CNT-OH), amine functionalized (CNT-NH2), and carboxyl functionalized (CNT-COOH) carbon nanotubes, polydimethylsiloxane (PDMS), and γ radiation were used in different combinations to prepare PDMS/CNT Chemiresistors. Even at the same ϕCNT, PDMS/CNT-NH2 Chemiresistors exhibited significantly milder response against toluene vapors than PDMS/CNT-COOH Chemiresistors, whereas PDMS/CNT-OH Chemiresistors were unresponsive due to poor nanotube dispersion and low electrical conductivity. PDMS/CNT-COOH Chemiresistors had the lowest surface en...
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network density tailored standalone flexible fluorocarbon elastomer nanocarbon black Chemiresistors for 2 propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
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Network density tailored standalone-flexible fluorocarbon elastomer/nanocarbon black Chemiresistors for 2-propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra Kumar, Lalit VarshneyAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
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novel hybrid nanocarbons poly dimethylsiloxane composites based Chemiresistors for real time detection of hazardous aromatic hydrocarbons
Carbon, 2016Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Lalit VarshneyAbstract:Abstract Hybrid nanocarbons have been reported to have synergetic advantages in several mechanical and electrical applications. However, little is understood how two geometrically different nanocarbons can affect the response of a chemiresistive sensor. The study reports development of poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT) and nanocarbon black based novel chemiresistive sensors through a solvent free route. These PDMS based sensors demonstrated high sensitivity and reversible response against benzene, toluene, ethyl benzene and xylene (BTEX) under dynamic flow as well as under static vapour conditions. It was found that the sensing response had a strong correlation with the BTEX-PDMS interaction parameters ( χ 12 ). However, such dependence was not observed at 3 wt% loading of CNT, due to CNT induced changes in the diffusion behavior of BTEX. CNT loading affected detection of each analyte differently; though, the principle component analysis using an array of four Chemiresistors with different CNT content demonstrated distinct pattern only for benzene. Intriguingly, the sensitivity and the temperature coefficient of resistance of Chemiresistors decreased; whereas, the detection range increased considerably with addition of CNT.
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Novel hybrid nanocarbons/poly(dimethylsiloxane) composites based Chemiresistors for real time detection of hazardous aromatic hydrocarbons
Carbon, 2016Co-Authors: R K Mondal, Y.k. Bhardwaj, Kumar A. Dubey, Lalit VarshneyAbstract:Abstract Hybrid nanocarbons have been reported to have synergetic advantages in several mechanical and electrical applications. However, little is understood how two geometrically different nanocarbons can affect the response of a chemiresistive sensor. The study reports development of poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT) and nanocarbon black based novel chemiresistive sensors through a solvent free route. These PDMS based sensors demonstrated high sensitivity and reversible response against benzene, toluene, ethyl benzene and xylene (BTEX) under dynamic flow as well as under static vapour conditions. It was found that the sensing response had a strong correlation with the BTEX-PDMS interaction parameters ( χ 12 ). However, such dependence was not observed at 3 wt% loading of CNT, due to CNT induced changes in the diffusion behavior of BTEX. CNT loading affected detection of each analyte differently; though, the principle component analysis using an array of four Chemiresistors with different CNT content demonstrated distinct pattern only for benzene. Intriguingly, the sensitivity and the temperature coefficient of resistance of Chemiresistors decreased; whereas, the detection range increased considerably with addition of CNT.
K A Dubey - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotube functionalization and radiation induced enhancements in the sensitivity of standalone Chemiresistors for sensing volatile organic compounds
ACS Applied Nano Materials, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Chemical stress-induced alterations in the number-density and the architecture of conducting interjunctions impart chemiresistivity in conducting polymer composites (CPCs). Herein, marked enhancement in the chemiresistive response of CPCs is reported by maneuvering interfacial and percolation characteristics of carbon nanotube (CNT) based Chemiresistors, through CNT functional group variation and high energy radiation exposure. Unfunctionalized (CNT-UF), hydroxyl functionalized (CNT-OH), amine functionalized (CNT-NH2), and carboxyl functionalized (CNT-COOH) carbon nanotubes, polydimethylsiloxane (PDMS), and γ radiation were used in different combinations to prepare PDMS/CNT Chemiresistors. Even at the same ϕCNT, PDMS/CNT-NH2 Chemiresistors exhibited significantly milder response against toluene vapors than PDMS/CNT-COOH Chemiresistors, whereas PDMS/CNT-OH Chemiresistors were unresponsive due to poor nanotube dispersion and low electrical conductivity. PDMS/CNT-COOH Chemiresistors had the lowest surface en...
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network density tailored standalone flexible fluorocarbon elastomer nanocarbon black Chemiresistors for 2 propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra KumarAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
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Network density tailored standalone-flexible fluorocarbon elastomer/nanocarbon black Chemiresistors for 2-propanone field detection
Sensors and Actuators B-chemical, 2018Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Jose Savio Melo, Jitendra Kumar, Lalit VarshneyAbstract:Abstract 2-propanone is a commonly-used chemical and is a biomarker of diabetic ketoacidosis. Herein, the development of a novel stand-alone chemiresistive sensor with high sensitivity and selectivity for 2-propanone is reported. Fluorocarbon elastomer (FCE)/nanocarbon black (NCB) conducting composites based Chemiresistors with different crosslinking densities were synthesized via melt compounding followed by radiation crosslinking. Conducting composites in different parts of the percolation profile were chosen to establish the dependence of 2-propanone sensing response on the conducting network and the radiation cross-linked network. The chemiresistor showed a highly selective response for 2-propanone whereas a considerably lower response was noted for benzene, toluene, xylene, ethanol, methanol and water. The sensing response had a strong correlation with the FCE-analyte interaction parameter (χ12).
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novel hybrid nanocarbons poly dimethylsiloxane composites based Chemiresistors for real time detection of hazardous aromatic hydrocarbons
Carbon, 2016Co-Authors: R K Mondal, K A Dubey, Y.k. Bhardwaj, Lalit VarshneyAbstract:Abstract Hybrid nanocarbons have been reported to have synergetic advantages in several mechanical and electrical applications. However, little is understood how two geometrically different nanocarbons can affect the response of a chemiresistive sensor. The study reports development of poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT) and nanocarbon black based novel chemiresistive sensors through a solvent free route. These PDMS based sensors demonstrated high sensitivity and reversible response against benzene, toluene, ethyl benzene and xylene (BTEX) under dynamic flow as well as under static vapour conditions. It was found that the sensing response had a strong correlation with the BTEX-PDMS interaction parameters ( χ 12 ). However, such dependence was not observed at 3 wt% loading of CNT, due to CNT induced changes in the diffusion behavior of BTEX. CNT loading affected detection of each analyte differently; though, the principle component analysis using an array of four Chemiresistors with different CNT content demonstrated distinct pattern only for benzene. Intriguingly, the sensitivity and the temperature coefficient of resistance of Chemiresistors decreased; whereas, the detection range increased considerably with addition of CNT.