Fabrication of gas sensor device using poly (3, 4-ethylenedioxythiophene)-poly (styrenesulfonate)-doped reduced graphene oxide organic thin films for detection of ammonia gas at room temperature
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A low cost and simple method for fabrication of a gas sensor device was developed using reduced graphene oxide (rGO)-doped poly (3, 4-ethylenedioxythiophene)-poly (styrenesulfonate) (PEDOT-PSS) organic thin film for the detection of ammonia gas at room temperature. Scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray photospectrometry and thermogravimetric analysis were used for the analysis of morphological, structural and thermal behavior of the prepared thin films. The doping of reduced graphene oxide in PEDOT-PSS was observed to increase the conductivity of pristine PEDOT-PSS thin films by threefold. The gas sensing mechanism of pure and doped PEDOT-PSS thin films were studied at room temperature by fabricating the sensor device on indium tin oxide-coated glass substrate. The gases such as ammonia, carbon monoxide, nitrogen dioxide and nitrogen were used to test the sensing performance in the prepared thin films. The reduced graphene oxide-doped PEDOT-PSS thin films show improved sensitivity towards all test gases, mainly toward ammonia gas with fast response and recovery times. The gas sensitivity of 10 wt% rGO-doped PEDOT-PSS thin film was observed to be about 87% for ammonia gas. The sensor stability test shows that, the prepared sensor is highly stable even after a period of 1 month. Due to improved sensitivity, stability and improved response and recovery times, these rGO-doped PEDOT-PSS organic thin films could be used to detect ammonia gas at low concentrations at room temperature.
KeywordsPEDOT-PSS Reduced graphene oxide (rGO) Conductivity Sensitivity Gas sensor devices
The authors thankfully acknowledge all the support and help extended by the authorities and the managements in carrying out this research work. Funding was provided by Visvesvaraya Technological University (Ref.12/2018, VTU-2302-10-18).