The sensitivity and the recovery behavior of SnO_2-based gas sensor prepared from a commercial SnO_2 powder were tested under the low concentration of DMMP(0.5μg/g) in the flow system at 350℃.In order to improve the...The sensitivity and the recovery behavior of SnO_2-based gas sensor prepared from a commercial SnO_2 powder were tested under the low concentration of DMMP(0.5μg/g) in the flow system at 350℃.In order to improve the sensitivity of the sensor,promoters such as NiO,Nb_2O_5,MoO_3,and Sb_2O_3 were added into SnO_2 powder.The sensitivities were increased up to 80% from 50% but they were not recovered.Only the SnO2-based gas sensor promoted with MoO_3 and Sb_2O_3 was recovered after detection of DMMP,although the recovery rate was slow.In particular,the SnO_2-based sensor promoted with 5wt% of MoO_3 and 1wt% of Sb_2O_3 simultaneously showed an complete recovery ability,though its sensitivity was 40% which was lower than that of SnO_2 gas sensor without promoters.This ability was discussed in terms of catalytic roles of promoters.展开更多
以聚环氧氯丙烷、乙基纤维素、聚表氯醇为敏感膜材料,建立了QCM传感器阵列法对DMMP空气样品定量检测的方法。DMMP浓度以气相色谱-火焰光度检测器法标定。在气体流速为300 m L/min时,在30~210 mg/m^3的DMMP浓度范围内,有良好的线性关系,...以聚环氧氯丙烷、乙基纤维素、聚表氯醇为敏感膜材料,建立了QCM传感器阵列法对DMMP空气样品定量检测的方法。DMMP浓度以气相色谱-火焰光度检测器法标定。在气体流速为300 m L/min时,在30~210 mg/m^3的DMMP浓度范围内,有良好的线性关系,方法具有较好的准确性和精密度,最低检测限为10.1 mg/m^3。利用主成分分析法对神经性毒剂沙林的干扰进行了分类判别研究。展开更多
The molecularly imprinted technology and the self-assembly technique were used together on the calixarene surface acoustic wave (SAW) chemical sensors to detect organophosphorus compounds. 25-(thioalkyl-alkoxy)-p-tert...The molecularly imprinted technology and the self-assembly technique were used together on the calixarene surface acoustic wave (SAW) chemical sensors to detect organophosphorus compounds. 25-(thioalkyl-alkoxy)-p-tertbutylcalix[4] arene with self-assembled monolayer character was the sensitive coating of the sensors. The sensors had a special response to organophosphorus compounds and the response frequency shift of this sensor to organophosphorus compounds in 0.1 mg/m3 was 350 Hz. The response frequency increased linearly with the increase of the concentration of DMMP in the range from 0.1 to 0.6 mg/m3. The possible explanation of the interaction between the coatings and organophosphorus compounds was discussed.展开更多
有机场效应晶体管(Organic field effect transistor,OFET)气体传感器能够有效对甲基膦酸二甲酯气体进行检测。该器件晶体管电学性能稳定,通过搭建动态气体测试系统,能够实现气体实时响应/恢复检测。使用并五苯有机场效晶体管检测沙林...有机场效应晶体管(Organic field effect transistor,OFET)气体传感器能够有效对甲基膦酸二甲酯气体进行检测。该器件晶体管电学性能稳定,通过搭建动态气体测试系统,能够实现气体实时响应/恢复检测。使用并五苯有机场效晶体管检测沙林模拟试剂甲基膦酸二甲酯,静态测试中检测限达到8 ppm,动态气体测试中检测限可达10 ppm。展开更多
文摘The sensitivity and the recovery behavior of SnO_2-based gas sensor prepared from a commercial SnO_2 powder were tested under the low concentration of DMMP(0.5μg/g) in the flow system at 350℃.In order to improve the sensitivity of the sensor,promoters such as NiO,Nb_2O_5,MoO_3,and Sb_2O_3 were added into SnO_2 powder.The sensitivities were increased up to 80% from 50% but they were not recovered.Only the SnO2-based gas sensor promoted with MoO_3 and Sb_2O_3 was recovered after detection of DMMP,although the recovery rate was slow.In particular,the SnO_2-based sensor promoted with 5wt% of MoO_3 and 1wt% of Sb_2O_3 simultaneously showed an complete recovery ability,though its sensitivity was 40% which was lower than that of SnO_2 gas sensor without promoters.This ability was discussed in terms of catalytic roles of promoters.
文摘以聚环氧氯丙烷、乙基纤维素、聚表氯醇为敏感膜材料,建立了QCM传感器阵列法对DMMP空气样品定量检测的方法。DMMP浓度以气相色谱-火焰光度检测器法标定。在气体流速为300 m L/min时,在30~210 mg/m^3的DMMP浓度范围内,有良好的线性关系,方法具有较好的准确性和精密度,最低检测限为10.1 mg/m^3。利用主成分分析法对神经性毒剂沙林的干扰进行了分类判别研究。
文摘The molecularly imprinted technology and the self-assembly technique were used together on the calixarene surface acoustic wave (SAW) chemical sensors to detect organophosphorus compounds. 25-(thioalkyl-alkoxy)-p-tertbutylcalix[4] arene with self-assembled monolayer character was the sensitive coating of the sensors. The sensors had a special response to organophosphorus compounds and the response frequency shift of this sensor to organophosphorus compounds in 0.1 mg/m3 was 350 Hz. The response frequency increased linearly with the increase of the concentration of DMMP in the range from 0.1 to 0.6 mg/m3. The possible explanation of the interaction between the coatings and organophosphorus compounds was discussed.
