Complex shell Fe-ZnO derived from ZIF-8 as high-quality acetone MEMS sensor  

作　　者：Bing Shen Tongwei Yuan Wenshuang Zhang Yang Chen Jiaqiang Xu 

机构地区：[1]Department of Physics,Department of Chemistry,College of Science,Shanghai University,Shanghai 200444,China [2]School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China

出　　处：《Chinese Chemical Letters》2024年第11期577-581,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.62271299);Shanghai Engineering Research Center for Integrated Circuits and Advanced Display Materials。

摘　　要：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 calcination 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,Fe^(2+)was introduced into the metal node to replace a part of Zn^(2+)ions,and it could be oxidized as Fe^(3+)in the calcination to facilitate the oxidation process of the 2-methylimdazole ligands to give Fe-ZnO complex shell with high specific surface area(108 m~2/g)and abundant oxygen vacancies(48%).The micro electro mechanical systems(MEMS)sensor based on the6%-Fe-ZnO complex shell performed outstanding gas sensing properties to the low-concentration acetone vapor,including high response(ΔR/R_g=11.2 to 5 ppm acetone),superior selectivity(S_(acetone)/S_(ethanol)=5.6)and fast response speed(τ_(res)=2.6 s).This work not only provided the research of an exceptional acetone MEMS sensor,but also induced a strategy to produce metal oxide derived from ZIFs with complex structures for the universal synthesis methodology.

关 键 词：ZIF-8 ZNO Ion oxidation MEMS sensor Acetone sensor 

分 类 号：TQ224.223[化学工程—有机化工] TP212[自动化与计算机技术—检测技术与自动化装置]