Heterogeneous Sensitization of Metal-Organic Framework Driven Metal@Metal Oxide Complex Catalysts on an Oxide Nanofiber Scaffold Toward Superior Gas Sensors

Won-Tae Koo; Seon-Jin Choi; Sang-Joon Kim; Ji-Soo Jang; Harry L Tuller; Il-Doo Kim

doi:10.1021/jacs.6b09167

Heterogeneous Sensitization of Metal-Organic Framework Driven Metal@Metal Oxide Complex Catalysts on an Oxide Nanofiber Scaffold Toward Superior Gas Sensors

J Am Chem Soc. 2016 Oct 12;138(40):13431-13437. doi: 10.1021/jacs.6b09167. Epub 2016 Sep 30.

Authors

Won-Tae Koo, Seon-Jin Choi, Sang-Joon Kim, Ji-Soo Jang, Harry L Tuller¹, Il-Doo Kim

Affiliation

¹ Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.

PMID: 27643402
DOI: 10.1021/jacs.6b09167

Abstract

We report on the heterogeneous sensitization of metal-organic framework (MOF)-driven metal-embedded metal oxide (M@MO) complex catalysts onto semiconductor metal oxide (SMO) nanofibers (NFs) via electrospinning for markedly enhanced chemical gas sensing. ZIF-8-derived Pd-loaded ZnO nanocubes (Pd@ZnO) were sensitized on both the interior and the exterior of WO₃ NFs, resulting in the formation of multiheterojunction Pd-ZnO and ZnO-WO₃ interfaces. The Pd@ZnO loaded WO₃ NFs were found to exhibit unparalleled toluene sensitivity (R_air/R_gas = 4.37 to 100 ppb), fast gas response speed (∼20 s) and superior cross-selectivity against other interfering gases. These results demonstrate that MOF-derived M@MO complex catalysts can be functionalized within an electrospun nanofiber scaffold, thereby creating multiheterojunctions, essential for improving catalytic sensor sensitization.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.