Ammonia‐Sensing Using a Composite of Graphene Oxide and Conducting Polymer. Issue 5 (23rd March 2018)

• Record Type: Journal Article
• Authors: Hasani, Amirhossein; Sharifi Dehsari, Hamed; Asghari Lafmejani, Milad; Salehi, Alireza; Afshar Taromi, Faramarz; Asadi, Kamal; Kim, Soo Young
• Is Part Of: Physica status solidi. Volume 12:Issue 5(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-03-23
• Subjects: ammonia sensors -- GaAs -- graphene oxide -- PEDOT:PSS -- Schottky diodes; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201800037
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : 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. Abstract : Hasani et al. investigate the mechanism of ammonia gas detection with the PEDOT:PSS:GO/n‐GaAs sensor. The interaction between NH3 polar molecules and PEDOT:PSS:GO leads to a charge transfer across delocalized π electrons resulting in the measured enhanced gaseous detection properties.