Badhulika Sushmee, Myung Nosang V, Mulchandani Ashok
Department of Electrical Engineering, University of California, Riverside, CA 92521, USA.
Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA.
Talanta. 2014 Jun;123:109-14. doi: 10.1016/j.talanta.2014.02.005. Epub 2014 Feb 11.
The current work involves fabrication, characterization and subsequent evaluation of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid) (PEDOT:PSS) coated single walled carbon nanotubes (SWNTs) sensors for detecting analytes of interest in industrial manufacturing. By varying the conducting polymer׳s synthesis conditions in terms of charge controlled electropolymerization of the monomer EDOT in presence of the dopant PSS, the sensing performance of the PEDOT:PSS functionalized SWNT sensors was systematically optimized. Electrical characterization in terms of change in resistance, cyclic voltammetry and field-effect transistor measurements was performed to confirm the presence of PEDOT:PSS coating on SWNTs. The optimized sensors exhibited sensing properties over a wide dynamic range of concentrations towards saturated vapors of volatile organic compounds (VOCs) such as methanol, ethanol and methyl ethyl ketone (MEK) at room temperature. The limit of detection of this sensor was found to be 1.3%, 5.95% and 3% for saturated vapors of methanol, ethanol and methyl ethyl ketone (MEK) respectively. In terms of performance, when compared with bare SWNTs, these hybrid sensors exhibited better sensitivity. The underlying mechanism of sensing was also investigated by using them in chemFET mode of sensor configuration.
当前的工作涉及制备、表征以及随后对掺杂有聚苯乙烯磺酸（PEDOT:PSS）的聚（3,4-乙撑二氧噻吩）包覆的单壁碳纳米管（SWNTs）传感器进行评估，以检测工业制造中感兴趣的分析物。通过在掺杂剂PSS存在的情况下，改变单体3,4-乙撑二氧噻吩（EDOT）的电荷控制电聚合方面的导电聚合物合成条件，系统地优化了PEDOT:PSS功能化SWNT传感器的传感性能。进行了电阻变化、循环伏安法和场效应晶体管测量方面的电学表征，以确认SWNTs上存在PEDOT:PSS涂层。优化后的传感器在室温下对挥发性有机化合物（VOCs）如甲醇、乙醇和甲乙酮（MEK）的饱和蒸汽在很宽的浓度动态范围内都表现出传感特性。该传感器对甲醇、乙醇和甲乙酮（MEK）饱和蒸汽的检测限分别为1.3%、5.95%和3%。在性能方面，与裸SWNTs相比，这些混合传感器表现出更好的灵敏度。还通过在传感器配置的化学场效应晶体管（chemFET）模式下使用它们来研究传感的潜在机制。
