ZnO-NANOWIRES COATED WITH GAMMA-ORDERED MESOPOROUS ALUMINA (GAMMA-OMA) CATALYST FOR DETECTION OF FREON

摘要

In this work, gamma-phase ordered mesoporous alumina (γ-OMA) is used as key catalyst to realize the sensitive detection of Freon R134a with ZnO micro-sensor. Due to the inert characteristic, Freon R134a (CH_2FCF_3) is difficult to be detected by using conventional oxide semiconductor gas sensors. γ-OMA catalyst exhibits satisfied active to R134a and produces several kinds of active radicals. The ZnO nanowire (ZnO NW) sensor is sensitive to the highly active radicals. The kinds of radicals are qualitative identified by mass spectrum (MS) and the γ-OMA catalyst-enhanced sensing mechanism is clearly elucidated.