Issue 20, 2018

Ultrathin ZIF-8 film containing polyoxometalate as an enhancer for selective formaldehyde sensing

Abstract

Gas sensing performances in ZnO sensors are critically limited by their fast electron–hole recombination, low gas selectivity and elevated operation temperature. 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 an ultrathin ZIF-8 film containing H5PMo10V2O40 polyoxometalate on the ZnO substrate surface. The device based on this composite exhibits an 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 responses for reducible gases with small molecular sizes, in particular for a selectivity value of 15.0 for formaldehyde over ethanol. The specific roles of the 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 the sensing ability. The new material of POM@ZIF-8@ZnO with high performance holds great promise in sensor materials for selective formaldehyde sensing.

Graphical abstract: Ultrathin ZIF-8 film containing polyoxometalate as an enhancer for selective formaldehyde sensing

Supplementary files

Article information

Article type
Paper
Submitted
27 Feb 2018
Accepted
13 Apr 2018
First published
14 Apr 2018

J. Mater. Chem. C, 2018,6, 5412-5419

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, 6, 5412 DOI: 10.1039/C8TC00987B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements