The Experts below are selected from a list of 6105 Experts worldwide ranked by ideXlab platform
Suko Phanichpha - One of the best experts on this subject based on the ideXlab platform.
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flame spray made metal loaded semiconducting metal oxides thick films for Flammable Gas sensing
Sensors and Actuators B-chemical, 2012Co-Authors: T Samerjai, Nittaya Tamaekong, Chaika Liewhira, A Wisitsoraa, Khatchari Wetchaku, Viruntacha Kruefu, Chawara Siriwong, Suko PhanichphaAbstract:Abstract Flame spray pyrolysis (FSP) presents a new technique for metal (Pt, Sn, Ru, Nb and W)-loaded metal oxide (MOX) nanoparticle synthesis, which requires only a single step. FSP prepared MOX nanoparticles have recently widely employed for Gas-sensing applications. In this work, the performance towards Flammable Gases of unloaded and metal (Pt, Sn, Ru, Nb and W)-catalyzed metal oxide (ZnO, WO 3 , SnO 2 and TiO 2 ) nanoparticle thick films fabricated by FSP and spin-coating is reviewed, discussed and compared to MOXs prepared by other methods. The Gas-sensing characteristics towards H 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 5 OH and CO Gases of FSP-prepared MOXs are found to be significantly improved in terms of response, response time and selectivity with small Pt, Sn, Ru, Nb and W loading contents ranging from 0.2 to 5 mol% or at.%. In addition, Pt loading on WO 3 and ZnO sensors results in excellent detection performances towards several Flammable Gases including H 2 , CH 4 and C 2 H 2 .
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highly selective environmental sensors based on flame spray made sno2 nanoparticles
Sensors and Actuators B-chemical, 2012Co-Authors: Chaika Liewhira, Nittaya Tamaekong, A Wisitsoraa, Suko PhanichphaAbstract:Abstract Flame-spray-made SnO 2 thick films fabricated by spin coating method were studied for toxic and Flammable Gas-sensing applications. From physical characterization by X-ray diffraction, Brunauer–Emmett–Teller analysis, scanning and transmission electron microscopy, SnO 2 nanoparticles were found to have non-agglomerated spherical, hexagonal, rectangle (3–10 nm), and rod-like (3–5 nm in width and 5–20 nm in length) morphologies with large specific surface area of 141.6 m 2 /g. The sensing films were prepared by spin coating on Al 2 O 3 substrate with interdigitated Au electrode. The sensing films were tested toward some important toxic (NO 2 , CO, SO 2 ) and Flammable (H 2 , C 2 H 2 ) Gases. It was found that SnO 2 sensing film showed excellent response and selectivity for NO 2 at a low operating temperature of 200 °C. In addition, the response linearly increased and the response time drastically decreased with increasing Gas concentration. Therefore, the spin-coated flame-spray-prepared SnO 2 sensor is one of the most promising candidates for highly sensitive and selective detection of noxious NO 2 Gas.
Beomseon Jang - One of the best experts on this subject based on the ideXlab platform.
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determination of Gas cloud shape for explosion risk analysis of offshore topside process area
Process Safety and Environmental Protection, 2020Co-Authors: Beomseon JangAbstract:Abstract Explosion Risk Analysis (ERA) is typically performed to evaluate the explosion Design Accidental Loads (DALs) for the topside structures and facilities on offshore platforms. The total number of Vapor Cloud Explosion (VCE) scenarios in the real world is innumerable. To deal with the entire range of possible scenarios, the ERA is typically performed in a probabilistic manner, where the actual scenarios are replaced by a certain number of representative scenarios. A representative scenario is defined by several independent variables such as Gas cloud volume, position and shape, and each of them should be probabilistically determined by using the concept of a Flammable Gas cloud frequency distribution. However, since an actual Gas cloud is an object that extends into the 3D space, it is difficult to determine the shape of the actual Gas cloud (or the fuel concentration distribution) with a particular scalar variable. In the existing ERA approach, therefore, the shape cannot be determined by the Flammable Gas cloud frequency distribution but is conservatively assumed to be a rectangular or other type of simple 3D geometry. Beyond the accuracy of this assumption, consistently determining the aspect ratio or other geometric parameters of the applied 3D geometry is a big issue in practice. Currently, for a given Gas cloud volume, there is little guidance on how to determine the geometric parameters of the applied 3D geometry, and the relevant data is eventually left to the engineering judgment and experience. Therefore, in most cases, ERA results may vary from engineer to engineer, rather than being uniquely evaluated. In view of this, the current study aims to develop a method to take into account the shape of the Gas cloud. The proposed method is designed to determine an equivalent Gas cloud that can represent a specific number of actual clouds. The actual clouds refer to a group of Gas clouds that are subdivided into the same category in the Flammable Gas cloud frequency distribution. Unlike the existing equivalent Gas clouds, the proposed Gas cloud has an inhomogeneous fuel concentration distribution whereby the shape can be implicitly considered.
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determination of Gas cloud shape for explosion risk analysis of offshore topside process area
Process Safety and Environmental Protection, 2020Co-Authors: Beomseon JangAbstract:Abstract Explosion Risk Analysis (ERA) is typically performed to evaluate the explosion Design Accidental Loads (DALs) for the topside structures and facilities on offshore platforms. The total number of Vapor Cloud Explosion (VCE) scenarios in the real world is innumerable. To deal with the entire range of possible scenarios, the ERA is typically performed in a probabilistic manner, where the actual scenarios are replaced by a certain number of representative scenarios. A representative scenario is defined by several independent variables such as Gas cloud volume, position and shape, and each of them should be probabilistically determined by using the concept of a Flammable Gas cloud frequency distribution. However, since an actual Gas cloud is an object that extends into the 3D space, it is difficult to determine the shape of the actual Gas cloud (or the fuel concentration distribution) with a particular scalar variable. In the existing ERA approach, therefore, the shape cannot be determined by the Flammable Gas cloud frequency distribution but is conservatively assumed to be a rectangular or other type of simple 3D geometry. Beyond the accuracy of this assumption, consistently determining the aspect ratio or other geometric parameters of the applied 3D geometry is a big issue in practice. Currently, for a given Gas cloud volume, there is little guidance on how to determine the geometric parameters of the applied 3D geometry, and the relevant data is eventually left to the engineering judgment and experience. Therefore, in most cases, ERA results may vary from engineer to engineer, rather than being uniquely evaluated. In view of this, the current study aims to develop a method to take into account the shape of the Gas cloud. The proposed method is designed to determine an equivalent Gas cloud that can represent a specific number of actual clouds. The actual clouds refer to a group of Gas clouds that are subdivided into the same category in the Flammable Gas cloud frequency distribution. Unlike the existing equivalent Gas clouds, the proposed Gas cloud has an inhomogeneous fuel concentration distribution whereby the shape can be implicitly considered.
Chaika Liewhira - One of the best experts on this subject based on the ideXlab platform.
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flame spray made metal loaded semiconducting metal oxides thick films for Flammable Gas sensing
Sensors and Actuators B-chemical, 2012Co-Authors: T Samerjai, Nittaya Tamaekong, Chaika Liewhira, A Wisitsoraa, Khatchari Wetchaku, Viruntacha Kruefu, Chawara Siriwong, Suko PhanichphaAbstract:Abstract Flame spray pyrolysis (FSP) presents a new technique for metal (Pt, Sn, Ru, Nb and W)-loaded metal oxide (MOX) nanoparticle synthesis, which requires only a single step. FSP prepared MOX nanoparticles have recently widely employed for Gas-sensing applications. In this work, the performance towards Flammable Gases of unloaded and metal (Pt, Sn, Ru, Nb and W)-catalyzed metal oxide (ZnO, WO 3 , SnO 2 and TiO 2 ) nanoparticle thick films fabricated by FSP and spin-coating is reviewed, discussed and compared to MOXs prepared by other methods. The Gas-sensing characteristics towards H 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 5 OH and CO Gases of FSP-prepared MOXs are found to be significantly improved in terms of response, response time and selectivity with small Pt, Sn, Ru, Nb and W loading contents ranging from 0.2 to 5 mol% or at.%. In addition, Pt loading on WO 3 and ZnO sensors results in excellent detection performances towards several Flammable Gases including H 2 , CH 4 and C 2 H 2 .
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highly selective environmental sensors based on flame spray made sno2 nanoparticles
Sensors and Actuators B-chemical, 2012Co-Authors: Chaika Liewhira, Nittaya Tamaekong, A Wisitsoraa, Suko PhanichphaAbstract:Abstract Flame-spray-made SnO 2 thick films fabricated by spin coating method were studied for toxic and Flammable Gas-sensing applications. From physical characterization by X-ray diffraction, Brunauer–Emmett–Teller analysis, scanning and transmission electron microscopy, SnO 2 nanoparticles were found to have non-agglomerated spherical, hexagonal, rectangle (3–10 nm), and rod-like (3–5 nm in width and 5–20 nm in length) morphologies with large specific surface area of 141.6 m 2 /g. The sensing films were prepared by spin coating on Al 2 O 3 substrate with interdigitated Au electrode. The sensing films were tested toward some important toxic (NO 2 , CO, SO 2 ) and Flammable (H 2 , C 2 H 2 ) Gases. It was found that SnO 2 sensing film showed excellent response and selectivity for NO 2 at a low operating temperature of 200 °C. In addition, the response linearly increased and the response time drastically decreased with increasing Gas concentration. Therefore, the spin-coated flame-spray-prepared SnO 2 sensor is one of the most promising candidates for highly sensitive and selective detection of noxious NO 2 Gas.
Nittaya Tamaekong - One of the best experts on this subject based on the ideXlab platform.
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the effect of mn on flame spray pyrolysis made zno nanoparticles for Flammable Gases detection
Journal of Nanoscience and Nanotechnology, 2014Co-Authors: Nittaya Tamaekong, T Samerjai, Chaikarn Liewhiran, Anurat Wisitsoraat, Sukon PhanichphantAbstract:: The application of Mn-loaded ZnO nanoparticles to the design of Flammable Gas sensors is nowadays one of the most active research fields, due to their high activity, good adsorption characteristics and high selectivity with high response to toxic and combustible Gases. It is sensitive to many Gases at moderate temperature, such as C2H4, CH4 and C2H2 Gases. FSP presents a new technique for 0.25-1.00 mol% Mn-loaded ZnO nanoparticles synthesis which involves only a single step. The crystallite sizes of ZnO spherical and hexagonal particles were found to be ranging from 5 to 15 nm while ZnO nanorods were seen to be 5-15 nm in width and 20-40 nm in length. In addition, very fine Mn nanoparticles were uniformly deposited on the surface of ZnO particles. The highest response for CH4 Gas was -240 towards 0.50 mol% Mn-loaded ZnO at 1.0 vol.% concentration of CH4 in dry air at 300 degrees C. The response of 0.50 mol% Mn-loaded ZnO of C2H4 Gas was as high as 72 for 1.0 vol.% while the response for C2H2 Gas was -13 towards 0.50 mol% Mn-loaded ZnO at 1.0 vol.% concentration of C2H2 in dry air at 300 degrees C.
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flame spray made metal loaded semiconducting metal oxides thick films for Flammable Gas sensing
Sensors and Actuators B-chemical, 2012Co-Authors: T Samerjai, Nittaya Tamaekong, Chaika Liewhira, A Wisitsoraa, Khatchari Wetchaku, Viruntacha Kruefu, Chawara Siriwong, Suko PhanichphaAbstract:Abstract Flame spray pyrolysis (FSP) presents a new technique for metal (Pt, Sn, Ru, Nb and W)-loaded metal oxide (MOX) nanoparticle synthesis, which requires only a single step. FSP prepared MOX nanoparticles have recently widely employed for Gas-sensing applications. In this work, the performance towards Flammable Gases of unloaded and metal (Pt, Sn, Ru, Nb and W)-catalyzed metal oxide (ZnO, WO 3 , SnO 2 and TiO 2 ) nanoparticle thick films fabricated by FSP and spin-coating is reviewed, discussed and compared to MOXs prepared by other methods. The Gas-sensing characteristics towards H 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 5 OH and CO Gases of FSP-prepared MOXs are found to be significantly improved in terms of response, response time and selectivity with small Pt, Sn, Ru, Nb and W loading contents ranging from 0.2 to 5 mol% or at.%. In addition, Pt loading on WO 3 and ZnO sensors results in excellent detection performances towards several Flammable Gases including H 2 , CH 4 and C 2 H 2 .
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highly selective environmental sensors based on flame spray made sno2 nanoparticles
Sensors and Actuators B-chemical, 2012Co-Authors: Chaika Liewhira, Nittaya Tamaekong, A Wisitsoraa, Suko PhanichphaAbstract:Abstract Flame-spray-made SnO 2 thick films fabricated by spin coating method were studied for toxic and Flammable Gas-sensing applications. From physical characterization by X-ray diffraction, Brunauer–Emmett–Teller analysis, scanning and transmission electron microscopy, SnO 2 nanoparticles were found to have non-agglomerated spherical, hexagonal, rectangle (3–10 nm), and rod-like (3–5 nm in width and 5–20 nm in length) morphologies with large specific surface area of 141.6 m 2 /g. The sensing films were prepared by spin coating on Al 2 O 3 substrate with interdigitated Au electrode. The sensing films were tested toward some important toxic (NO 2 , CO, SO 2 ) and Flammable (H 2 , C 2 H 2 ) Gases. It was found that SnO 2 sensing film showed excellent response and selectivity for NO 2 at a low operating temperature of 200 °C. In addition, the response linearly increased and the response time drastically decreased with increasing Gas concentration. Therefore, the spin-coated flame-spray-prepared SnO 2 sensor is one of the most promising candidates for highly sensitive and selective detection of noxious NO 2 Gas.
A Wisitsoraa - One of the best experts on this subject based on the ideXlab platform.
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flame spray made metal loaded semiconducting metal oxides thick films for Flammable Gas sensing
Sensors and Actuators B-chemical, 2012Co-Authors: T Samerjai, Nittaya Tamaekong, Chaika Liewhira, A Wisitsoraa, Khatchari Wetchaku, Viruntacha Kruefu, Chawara Siriwong, Suko PhanichphaAbstract:Abstract Flame spray pyrolysis (FSP) presents a new technique for metal (Pt, Sn, Ru, Nb and W)-loaded metal oxide (MOX) nanoparticle synthesis, which requires only a single step. FSP prepared MOX nanoparticles have recently widely employed for Gas-sensing applications. In this work, the performance towards Flammable Gases of unloaded and metal (Pt, Sn, Ru, Nb and W)-catalyzed metal oxide (ZnO, WO 3 , SnO 2 and TiO 2 ) nanoparticle thick films fabricated by FSP and spin-coating is reviewed, discussed and compared to MOXs prepared by other methods. The Gas-sensing characteristics towards H 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 5 OH and CO Gases of FSP-prepared MOXs are found to be significantly improved in terms of response, response time and selectivity with small Pt, Sn, Ru, Nb and W loading contents ranging from 0.2 to 5 mol% or at.%. In addition, Pt loading on WO 3 and ZnO sensors results in excellent detection performances towards several Flammable Gases including H 2 , CH 4 and C 2 H 2 .
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highly selective environmental sensors based on flame spray made sno2 nanoparticles
Sensors and Actuators B-chemical, 2012Co-Authors: Chaika Liewhira, Nittaya Tamaekong, A Wisitsoraa, Suko PhanichphaAbstract:Abstract Flame-spray-made SnO 2 thick films fabricated by spin coating method were studied for toxic and Flammable Gas-sensing applications. From physical characterization by X-ray diffraction, Brunauer–Emmett–Teller analysis, scanning and transmission electron microscopy, SnO 2 nanoparticles were found to have non-agglomerated spherical, hexagonal, rectangle (3–10 nm), and rod-like (3–5 nm in width and 5–20 nm in length) morphologies with large specific surface area of 141.6 m 2 /g. The sensing films were prepared by spin coating on Al 2 O 3 substrate with interdigitated Au electrode. The sensing films were tested toward some important toxic (NO 2 , CO, SO 2 ) and Flammable (H 2 , C 2 H 2 ) Gases. It was found that SnO 2 sensing film showed excellent response and selectivity for NO 2 at a low operating temperature of 200 °C. In addition, the response linearly increased and the response time drastically decreased with increasing Gas concentration. Therefore, the spin-coated flame-spray-prepared SnO 2 sensor is one of the most promising candidates for highly sensitive and selective detection of noxious NO 2 Gas.