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Highly sensitive reproducible ammonia sensor based on poly (3,4-ethylenedioxythiophene)

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Author Affiliations

  • 1Electronic Science Department H.P.T. Arts and R.Y.K. Science College, Nashik-05, India
  • 2Department of Chemistry, Nowrosjee Wadia College, Pune-01, India
  • 3Electronic Science Department H.P.T. Arts and R.Y.K. Science College, Nashik-05, India
  • 4Electronic Science Department H.P.T. Arts and R.Y.K. Science College, Nashik-05, India

Res. J. Material Sci., Volume 12, Issue (1), Pages 21-26, February,16 (2024)

Abstract

Poly (3,4-ethylenedioxythiophene) (PEDOT) was chemically synthesized and used to fabricate the ammonia sensor. The synthesized sample was characterized by different techniques such as FTIR, XRD and electrical conductivity measurements. UV-Visible spectral results were used to find the band-gap energy of the sample and it falls in semiconducting range. XRD analysis was used for crystallinity calculations showed that the sample was amorphous in nature. Electrical conductivity (σ) measurement was carried out by four points and it was found to be 2.94X10-2S/cm. Log σ versus 1/T graph showed semiconducting behaviour of the sample. The sensitivity of prepared sample was calculated for various (CO, CO2, H2S and NH3) at 500ppm. Among these gases PEDOT sample showed highest sensitivity for NH3 gas. Further samples were tested at various temperature (25oC, 50oC, 100oC and 150oC) and voltages (1 V, 5 V, 10 V and 15 V). The sample showed the highest sensitivity for 100oC at all voltages. The maximum sensitivity was observed for 1V. Further, the performance for ammonia gas was also measured using one pot method for various (50ppm, 25ppm, 12ppm, 6ppm, and 3ppm) concentrations at room temperature (280C). For all concentrations the average response time and recovery time of PEDOT for ammonia gas was 60 and 70 seconds respectively. PEDOT as an ammonia sensor can be used with average 35% sensitivity for more than 180 days.

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