الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
conducting polymer composites have been used to produce flexible devices and this attracted much researchers’ attention. in this study, we fabricated high sensitive and low-cost chemical gas sensors by inkjet printing using electronic ink made of poly (3,4-ethylene dioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) composite with multi carbon nanotube ( MWCNT ) to improve the sensitivity value for the sensor. MWCNTs is functionalized to be soluble in conductive polymer Aquia Regia 3:1 sulfuric to nitric acid, the electronic ink was printed on a transparent substrate by 3 and 5 layers with an interdigitated electrode fabricated with screen printing of silver ink then investigated to chemical gases (NH3, O2, CO2) at room temperature in isolated steel homemade chamber. the flexible gas sensor exhibits high efficiency and sensitivity. The sensor works linearly with gas concentrations between 100 to 500 ppm of gases at room temperature, but it appears significant selectivity to ammonia in comparison with carbon dioxide and oxygen, gas sensor surface is characterized used scanning electron microscope, the electronic ink characterized by using Fourier-transform infrared (FT-IR) spectroscopy to analyze the ink functional groups, as well as the conductivity of gas sensor, is determined using potentiostat-galvanostat.