Abstract
We demonstrate a poly ([4,8-bis[(2-ethylhexyl) oxy]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl][3-fluoro-2-[(2-et- hylhexyl)carbonyl]thieno[3,4-b] thiophenediyl]) (PTB7) decorated zinc oxide (ZnO) nanorod-based interdigitated metal–semiconductor–metal (MSM) device as ammonia (NH3) sensor at room temperature. The gas sensor response is 66.92% at 20 ppm and 2 V of bias at ambient temperature (~25 °C). The average roughness and the root-mean-square roughness of the hydrothermally synthesized ZnO nanorods (ZnO NRs) were measured as 0.140 and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.175 ~\mu \text{m}$ </tex-math></inline-formula> , respectively. The device was found sensitive at gas concentration as low as ~2 ppm with a response of 7.12%. At a gas flow rate of 20 ppm and a bias of 2 V, the response and recovery times of the as-fabricated device were measured to be 5 and 30 s, respectively.
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