Effect of Thermal Treatments on the Transduction Behaviors of Conductometric Hydrogen Gas Sensors Integrated with HCl-Do
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1042-S06-06
Effect of Thermal Treatments on the Transduction Behaviors of Conductometric Hydrogen Gas Sensors Integrated with HCl-Doped Polyaniline Nanofibers Pen-Cheng Wang1,2, Yaping Dan3, Luke A. Somers2, Alan G. MacDiarmid1, and A.T. Charlie Johnson2,3 1 Department of Chemistry, University of Pennsylvania, Philadelphia, PA, 19104 2 Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA, 19104 3 Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, 19104
ABSTRACT We present the effect of thermal treatments on the transduction behaviors of HCl-doped polyaniline (PANI) nanofibers integrated in conductometric devices upon exposure to 1% H2 (carried by N2). After drying in N2 at 25ºC for 12 hours, devices showed a ~10% decrease in electrical resistance upon exposure to 1% H2. However, devices subject to 12-hour drying in N2 at 25ºC followed by further thermal treatments in N2 at 100ºC, 164ºC or 200ºC for 30 minutes showed different transduction behaviors. Specifically, devices subject to thermal treatments at 100ºC and 164ºC showed a decrease in electrical resistance by ~7% and 500 μm). After the conductometric device was assembled into the experimental set-up (see Figure 1), the device was dried in N2 at 25ºC for 12 hours. The conductometric response of the devices subject to the different thermal treatment conditions and then exposed to several cycles of 1% H2 is shown in Figure 2. In general, after drying in N2 at 25ºC for 12 hours, devices showed a ~10% decrease (when the device transduction pattern was stabilized; same for the following discussion) in electrical resistance upon exposure to 1% H2. However, devices subject to 12-hour drying in N2 at 25ºC and further thermal treatments in N2 at 100ºC, 164ºC or 200ºC for 30 minutes showed different transduction behaviors. Specifically, devices subject to thermal treatments at 100ºC and 164ºC showed a decrease in electrical resistance by ~7% and
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