PEN-BASED WRITING OF FUNCTIONALIZED MWCNT-PEDOT:PSS INK ON FLEXIBLE SUBSTRATE FOR APPLICATION IN AMMONIA GAS SENSOR
Keywords:
Ink, Carbon Nanotube, PEDOT: PSS, Gas Sensor, Based WritingAbstract
Functionalized multi-walled carbon nanotubes dispersed in a polymer mixture of poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (f-MWCNT-PEDOT:PSS) have been presented as a functional ink for fabrication of room-temperature gas sensor. The ink was deposited onto the flexible substrates with silver interdigitated electrodes by a handwriting method. The sensor shows the sensitivity and selectivity to NH3 at room-temperature. The high performance of sensor has attributed to the functionalized effect in the increment of extra active area for gas adsorption. The sensor can be worked without noticeable reduction in gas response although it is bent to the heavy disorder. The sensing mechanisms of sensor have proposed based on the reaction between NH3 molecules and oxygen species on the surface of f-MWCNTs. The direct charge-transfers and the film swelling of polymer have been also proposed as possible NH3-sensing mechanisms. From these findings, the direct ink writing is an effective method for preparing the sensing film of gas sensor. Furthermore, the f-MWCNT-PEDOT: PSS ink has the high potential to be selected as a good material for flexible NH3-sensing applications.
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