Jaruwan En-OnAdisorn TuantranontTeerakiat KerdcharoenChatchawal WongchoosukKasetsart UniversityThailand National Electronics and Computer Technology CenterMahidol University2018-12-212019-03-142018-12-212019-03-142017-01-01RSC Advances. Vol.7, No.27 (2017), 16885-16889204620692-s2.0-85015757437https://repository.li.mahidol.ac.th/handle/20.500.14594/42145© The Royal Society of Chemistry. In this work, the fabrication and performance of flexible alternating current electroluminescent (AC-EL) devices for ammonia (NH3) detection at room temperature are presented for the first time. The AC-EL gas sensor was fabricated by the screen-printing of a ZnS:Cu,Cl phosphor and PEDOT:PSS sensing layers. The effects of parameters including applied voltage, excitation frequency and waveform on light emission and luminance intensity of the AC-EL gas sensor were systematically investigated. From gas-sensing characterization, the AC-EL gas sensor exhibited very high selectivity and a linear response to NH3 in the concentration range of 100-1000 ppm at room temperature. A sensing mechanism of the EL gas sensor was proposed based on the resistance change of the PEDOT:PSS sensing layer via a charge-transfer process.Mahidol UniversityChemical EngineeringChemistryArticleSCOPUS10.1039/c7ra01318c