Hydrophobic polymer [ex.Poly(vinylidenfluoride)] layer was coated on polyaniline (PANi) sensor to reduce the problems of humidity.The differences in sensitivity to methanol gas detection in various humidity condition ...Hydrophobic polymer [ex.Poly(vinylidenfluoride)] layer was coated on polyaniline (PANi) sensor to reduce the problems of humidity.The differences in sensitivity to methanol gas detection in various humidity condition between pure-PANi sensor and coated with poly(vinylidenfluoride) polymer (PVDF) (coated-PANi sensor) were investigated.Also the relation between the density of pore,which was coated on the layer of the PANi sensor,and sensitivity was investigated.To fabricate the porous PVDF layer on PANi sensor,poly(vinylalcohol) (PVA),which is water-soluble polymer,was used. Coated-PANi sensor was less affected by humidity compared with pure-PANi sensor.And higher density of pore on PVDF layer led to higher sensitivity.展开更多
SnO_2 nanowires and ZnO nanorods were grown on the surface of thin film by heat treatment of mental Sn and Zn under Ar gas flow and O_2 atmospheric pressure.The sensitivity of the SnO_2 thin film device on which grown...SnO_2 nanowires and ZnO nanorods were grown on the surface of thin film by heat treatment of mental Sn and Zn under Ar gas flow and O_2 atmospheric pressure.The sensitivity of the SnO_2 thin film device on which grown nanowires to CO gas(concentration of 5000μg/g)was 50% at the operating temperature of 200℃.In case of using Pt as catalysts,the sensitivity was enhanced and operating temperature was reduced(sensitivity of 70% at the operating temperature of 150℃). The sensitivity of the ZnO nanorods device using Cu as catalysts to NO_x gas was 90% at the operating temperature of 200℃.It was found that the sensitivity to CO and NO_x gases for the device on which grown nanostructures was much higher than those for general thin films devices.展开更多
We investigated the gas sensing characteristics of rutile and anatase TiO_2 nano-particle sensors for chemical warfare agents.TiO_2 nano-powders with rutile and anatase structure were fabricated by controlling pH valu...We investigated the gas sensing characteristics of rutile and anatase TiO_2 nano-particle sensors for chemical warfare agents.TiO_2 nano-powders with rutile and anatase structure were fabricated by controlling pH value without heat treatment respectively.The mean particle size of TiO_2 powders were below 10 nm.As-prepared TiO_2 powders have several advantages of nano particle size and high surface area and could be a prominent candidate for nano-sensors.TiO_2 sensors were examined with DMMP for chemical warfare agents detection.展开更多
文摘Hydrophobic polymer [ex.Poly(vinylidenfluoride)] layer was coated on polyaniline (PANi) sensor to reduce the problems of humidity.The differences in sensitivity to methanol gas detection in various humidity condition between pure-PANi sensor and coated with poly(vinylidenfluoride) polymer (PVDF) (coated-PANi sensor) were investigated.Also the relation between the density of pore,which was coated on the layer of the PANi sensor,and sensitivity was investigated.To fabricate the porous PVDF layer on PANi sensor,poly(vinylalcohol) (PVA),which is water-soluble polymer,was used. Coated-PANi sensor was less affected by humidity compared with pure-PANi sensor.And higher density of pore on PVDF layer led to higher sensitivity.
文摘SnO_2 nanowires and ZnO nanorods were grown on the surface of thin film by heat treatment of mental Sn and Zn under Ar gas flow and O_2 atmospheric pressure.The sensitivity of the SnO_2 thin film device on which grown nanowires to CO gas(concentration of 5000μg/g)was 50% at the operating temperature of 200℃.In case of using Pt as catalysts,the sensitivity was enhanced and operating temperature was reduced(sensitivity of 70% at the operating temperature of 150℃). The sensitivity of the ZnO nanorods device using Cu as catalysts to NO_x gas was 90% at the operating temperature of 200℃.It was found that the sensitivity to CO and NO_x gases for the device on which grown nanostructures was much higher than those for general thin films devices.
文摘We investigated the gas sensing characteristics of rutile and anatase TiO_2 nano-particle sensors for chemical warfare agents.TiO_2 nano-powders with rutile and anatase structure were fabricated by controlling pH value without heat treatment respectively.The mean particle size of TiO_2 powders were below 10 nm.As-prepared TiO_2 powders have several advantages of nano particle size and high surface area and could be a prominent candidate for nano-sensors.TiO_2 sensors were examined with DMMP for chemical warfare agents detection.
