Jump to main content
Jump to site search


Ultrathin ZIF-8 Film Containing Polyoxometalate as an Enhancer for Selective Formaldehyde Sensing

Abstract

Gas sensing performances are critically limited by fast electron-hole recombination, low gas selectivity and elevated operation temperature in ZnO sensors. To alleviate these problems, new and high-performance sensor materials are desirable. Herein, we fabricate a core-shell composite material of POM@ZIF-8@ZnO with ultrathin ZIF-8 film containing H5PMo10V2O40 polyoxometalate on the ZnO substrate surface. The device based on this composite exhibits improved gas sensing ability toward formaldehyde (HCHO) at room temperature (25 °C) with a sensitivity of ~0.4 ppm. Additionally, the POM@ZIF-8@ZnO material exhibits selective gas response for reducible gases with small molecular sizes, in particular for the selectivity value of 15.0 for formaldehyde over ethanol. The specific roles of ZIF-8 shell and POM are discussed in detail: ZIF-8 is responsible for concentrating and recognizing analyte molecules on the ZnO surface, and POM accounts for enhancing sensing ability. The new material of POM@ZIF-8@ZnO with high performance holds great promise in sensor materials for selective formaldehyde sensing.

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Feb 2018, accepted on 13 Apr 2018 and first published on 14 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC00987B
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
  •   Request permissions

    Ultrathin ZIF-8 Film Containing Polyoxometalate as an Enhancer for Selective Formaldehyde Sensing

    P. Wang, X. Zou, H. Tan, S. Wu, L. Jiang and G. Zhu, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00987B

Search articles by author

Spotlight

Advertisements