Abstract
The higher operating temperature of metal oxide and air instability of organic based NO2 sensor causes extremely urgent for development of a reliable low cost sensor to detect NO2 at room temperature. Therefore, we present a fabrication of large area Polymer/GO nano hybrid thin film for polymer thin film transistors (PTFTs) based NO2 sensors assisted via facile method named ‘spreading-solidifying (SS) method’, grown over air/liquid interface and successive investigation of effect of NO2 on film via several characterizations. The PTFTs sensor has demonstrated swift and high response towards low concentration of NO2 gas with air stability and provided real time non-invasive type NO2 sensor. Herein, we are reporting the nanohybrid PBTTT/GO composite based PTFT sensor with good repeatability and sensor response for low concentration NO2. The thin film grown via SS technique has reported very good adsorption/desorption of target analyte having response/recovery time of 75 s/523 s for 10 ppm concentration of NO2 gas. It has been observed that % change in drain current (sensor response) saturated with increasing concentration of NO2. The transient analysis demonstrates the fast sensor response and recovery time. Furthermore, in order to understand the insight of high performance of sensor, effect of NO2 on nanohybrid film and sensing mechanism, an in situ investigations was conducted via multiple technique viz. spectral, electronic, structural, and morphological characterization. Finally, the performance of sensor and the site of adsorption of NO2 at polymer chains were argued using schematic diagram. This work shows the simple fabrication process for mass production, low cost and room temperature operated gas sensors for monitoring the real-time environment conditions and gives an insight about the sensing mechanism adsorption site of NO2.
Highlights
The higher operating temperature of metal oxide and air instability of organic based NO2 sensor causes extremely urgent for development of a reliable low cost sensor to detect NO2 at room temperature
In order to harvest the unique characteristics of two-dimensional graphene oxide (GO) nanosheets and promising conjugated polymer PBTTT, we have directed towards fabricating of thin film of hybrid nano-composite by selecting these two materials for polymer thin film transistors (PTFTs) as NO2 gas sensor
We have successfully explored the facile SS method for fabrication of large area, highly oriented active matrix of PTFTs using PBTTT/GO nano composite-hybrid
Summary
The higher operating temperature of metal oxide and air instability of organic based NO2 sensor causes extremely urgent for development of a reliable low cost sensor to detect NO2 at room temperature. In order to understand the insight of high performance of sensor, effect of NO2 on nanohybrid film and sensing mechanism, an in situ investigations was conducted via multiple technique viz. The higher operating temperature (>300 °C) increases the cost and has limitation to work in low temperature or flammable environment Considering these challenges, organic field effect transistors based sensors have been reported as potential replacement but poor repeatability and sluggish response limit their applications. In order to harvest the unique characteristics of two-dimensional GO nanosheets and promising conjugated polymer PBTTT, we have directed towards fabricating of thin film of hybrid nano-composite by selecting these two materials for PTFTs as NO2 gas sensor. An analytical approach to understand the sensing mechanism of NO2, an in situ investigation was conducted via multiple technique viz. spectral characterization using electronic absorption spectra, FT-IR, Raman, electronic characterization using Cyclic Voltammetry, structural characterization using GIXD and morphological characterization using AFM, Phase imaging and KPFM and Phase contrast which reveals the insight of high performance and site of adsorption of NO2 at polymer chains
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