Abstract
Zeolitic imidazolate frameworks(ZIFs)are a series of materials composited by metal ions and organic ligands with high specific surface area,which might be great precursors to produce metal oxides by cal-cination for gas sensor application.However,Zn-ZIF(ZIF-8)is hard to transform as ZnO in air and keeping the unique framework simultaneously.In this work,Fe2+was introduced into the metal node to replace a part of Zn2+ions,and it could be oxidized as Fe3+in the calcination to facilitate the oxidation process of the 2-methylimdazole ligands to give Fe-ZnO complex shell with high specific surface area(108m2/g)and abundant oxygen vacancies(48％).The micro electro mechanical systems(MEMS)sensor based on the 6％-Fe-ZnO complex shell performed outstanding gas sensing properties to the low-concentration acetone vapor,including high response(ΔR/Rg=11.2 to 5 ppm acetone),superior selectivity(Sacetone/Sethanol=5.6)and fast response speed(rres=2.6s).This work not only provided the research of an exceptional ace-tone MEMS sensor,but also induced a strategy to produce metal oxide derived from ZIFs with complex structures for the universal synthesis methodology.
维普
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