Ammonia-Sensing Using a Composite of Graphene Oxide and Conducting Polymer

Amirhossein Hasani, Hamed Sharifi Dehsari, Milad Asghari Lafmejani, Alireza Salehi, Faramarz Afshar Taromi, Kamal Asadi, Soo Young Kim

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24 Citations (SciVal)


The paper studies the performance of a gas sensor based on an organic/inorganic diode for ammonia (NH3) sensing under atmospheric conditions at room temperature and different humidity levels. The diode structure consists of a layer of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) deposited on top of n-type GaAs. The PEDOT:PSS layer that is filled with different ratios of graphene oxide (GO) is prepared from the solution phase. We show that the current–voltage (I–V) response of­­­­­ the diode and the sensing performance improve significantly by adding GO to the PEDOT:PSS layer. The sensing response is highest for a diode with 0.04 wt.% of GO. At room temperature, the PEDOT:PSS:GO (0.04 wt.%)/n-GaAs Schottky diode shows a sensitivity of 194 upon exposure to 20 ppm of NH3 with rapid response and recovery times between 95 and 121 s, respectively. The NH3 sensor based on PEDOT:PSS:GO is cost-effective, environmentally friendly, and easy to fabricate using low-cost solution-processing methods.

Original languageEnglish
Article number1800037
JournalPhysica Status Solidi - Rapid Research Letters
Issue number5
Publication statusPublished - May 2018


  • ammonia sensors
  • GaAs
  • graphene oxide
  • Schottky diodes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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