title: Heterogeneous Sensitization of Metal-Organic Framework Driven Metal@Metal Oxide Complex Catalysts on an Oxide Nanofiber Scaffold Toward Superior Gas Sensors.
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 WO3NFs, resulting in the formation of multiheterojunction Pd-ZnO and ZnO-WO3interfaces. The Pd@ZnO loaded WO3NFs were found to exhibit unparalleled toluene sensitivity (Rair/Rgas= 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.
authors.forename: Won-Tae
authors.initials: WT
authors.lastname: Koo
authors.forename: Seon-Jin
authors.initials: SJ
authors.lastname: Choi
authors.forename: Sang-Joon
authors.initials: SJ
authors.lastname: Kim
authors.forename: Ji-Soo
authors.initials: JS
authors.lastname: Jang
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Harry L
authors.initials: HL
authors.lastname: Tuller
authors.forename: Il-Doo
authors.initials: ID
authors.lastname: Kim