Moon, Jaehyun Park, Jin-Ah Lee, Su-Jae Chu, Hye Yong Zyung, Taehyoung Kim, Il-Doo 2024-01-20T19:01:12Z 2024-01-20T19:01:12Z 2021-09-05 2010-07-15 0925-4005 https://pubs.kist.re.kr/handle/201004/131249 To enhance the sensitivity of a metal oxide-based gas sensor, we introduce a novel electrical method that relies jointly on the use of impedance and an applied DC bias. We used polycrystalline ZnO-NiO composite thin films prepared by pulsed layer deposition as CO gas sensor material. The applied DC bias lowers the interface barrier between oxide grains and thereby enhances the sensitivity. Our approach enhances the sensitivity to CO gas by approximately 200% more than a conventional DC method. The enhancement effect is more pronounced when the CO concentration is lowered. This method offers an efficient characterization tool for modulating the sensitivity of gas sensors using semiconducting metal oxides. (C) 2010 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA SENSING PROPERTIES GRAIN-BOUNDARIES SENSORS ZNO FABRICATION NANOFIBERS IMPEDANCE CO Gas sensitivity modulation of oxide thin films by means of an electrical method Article 10.1016/j.snb.2010.04.050 1 SENSORS AND ACTUATORS B-CHEMICAL, v.148, no.2, pp.539 - 543 SENSORS AND ACTUATORS B-CHEMICAL 148 2 539 543 scie scopus 000280382200026 2-s2.0-77954678427 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article SENSING PROPERTIES GRAIN-BOUNDARIES SENSORS ZNO FABRICATION NANOFIBERS IMPEDANCE CO Metal oxide Pulsed laser deposition Sensitivity Impedance spectroscopy DC bias