Well-connected ZnO nanoparticle network fabricated by in-situ annealing of ZIF-8 for enhanced sensitivity in gas sensing application

SENSORS AND ACTUATORS B-CHEMICAL

卷:344

Article

Xia, Yong^1,2,4,6  Pan, Aifei^1,2,3,4  Gardner, David W.^1,2  Zhao, Sikai^1,2,5  Davey, Adrian K.^1,2  Li, Zhou^1,2  Zhao, Libo^3,4,6  Carraro, Carlo^1,2  Maboudian, Roya^1,2 

[1] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Berkeley Sensor & Actuator Ctr, Berkeley, CA 94720 USA

[3] Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Xian 710054, Peoples R China

[4] Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Peoples R China

[5] Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China

[6] Xian Jiaotong Univ Yantai, Res Inst Intelligent Sensing Technol & Syst, Int Joint Lab Micro Nano Mfg & Measurement Techno, State Key Lab Mfg Syst Engn, Xian 710054, Peoples R China

关键词: In-situ annealing;    MOFs;    Metal oxide nanoparticle network;    Gas sensing;    AC impedance spectroscopy;   

DOI  :  10.1016/j.snb.2021.130180

来源: Elsevier

【 摘 要 】

Low-power microheater platforms are promising in lowering power consumption during gas sensing processes. However, the small amount of activated-material and poor electrical contact greatly affect the sensitivity. Here, via in-situ annealing of a porous metal organic framework (MOF), ZIF-8, using a miniature heater electrode with a fast ramp rate (ca. 60 degrees C/s), we demonstrate the formation of a well-connected nanoparticle network with high porosity. Nanoparticle networks prepared in-situ exhibit significantly enhanced response to ethanol, defined as the ratio of sensor's resistance before and after gas exposure, compared to ex-situ annealed counterparts (>10 times larger response) and to commercially available nanoparticles (similar to 4 times larger response) at a sensing temperature of 250 degrees C. The mechanism of the enhanced performance is studied using AC impedance spectroscopy. The results indicate that the large number of highly accessible and effective adsorption sites on the in-situ annealed material are responsible for the enhancement.

【 授权许可】

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