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基于超薄有机微纳单晶晶体管的高灵敏H_2S气体传感器
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摘要
基于超薄Ph.5T2单晶微米片,我们实现了可以室温工作的高灵敏有机场效应H_2S气体传感器。在50 ppm的H_2S气体中,器件灵敏度高达1.2×10~6%,是目前探测H_2S灵敏度的最高值。对于H_2S气体传感器而言,此值非常高,比通常报道的半导体气体传感器高三个量级以上[1-3]。器件的响应和恢复时间分别为2 min和1 min,探测下限低至0.5 ppm。理论分析高灵敏度源于,超薄的Ph5T2微纳单晶片增加了气体分子与导电沟道的相互作用,结合场效应晶体管中的栅压具有放大源/漏电流作用,可在亚阈值区获得高灵敏度[4]。实现结果显示,Ph5T2是很好的气敏材料,成功构筑室温条件下,具有高灵敏度、低探测下限、快速响应及完全恢复特性的半导体场效应式气体传感器,显示了在气敏探测方面的应用前景。
Based on ultrathin dinaphtho[3,4-d:3',4'-d']benzo[1,2-b:4,5-b']dithiophene(Ph5T2) single-crystal microplates,the highly sensitive organic field-effect H_2S sensors are realized at room temperature.The response is as high as1.2×10~6%in 50 ppm H_2S.This value is extremely high for H_2S sensors,and is three orders of magnitude higher than that of the most reported semiconductor gas sensors[1-3].The response/recovery time is respectively as low as2 min and 1 min in 50 ppm H_2S.The detect limitation is as low as 0.5 ppm.The ultrathin single-crystal microplates provide direct and efficient ways for the analytes' activities within the conducting channel[4],and therefore mainly account for the improved sensing performance.The excellent sensing performance of ultrathin Ph5T2 single-crystal microplate transistors reveals the capacity of developing highly sensitive room-temperature sensors.
引文
[1]Yin,L.;Chen,D.;Zhang,H.;Shao,G.;Fan,B.;Zhang,R.;Shao,G.Mater.Chem.Phys.2014,148:1099.
    [2]Lee,I.;Choi,S.-J.;Park,K.-M.;Lee,S.S.;Choi,S.;Kim,I.-D.;Park,CO.Sens.Actuators B Chem.2014,197,300.
    [3]Li,X.;Jiang,Y;Xie,G.;Tai,H.;Sun,P.;Zhang,B.Sens.Actuators B Chem.2013,176,1191.
    [4]L.Li,P.Gao,M.Baumgarten,K.Mullen,N.Lu,H.Fuchs,L.Chi,Adv.Mater.2013,25,3419.

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