Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
J Am Chem Soc. 2016 Oct 12;138(40):13431-13437. doi: 10.1021/jacs.6b09167. Epub 2016 Sep 30.
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 WO NFs, resulting in the formation of multiheterojunction Pd-ZnO and ZnO-WO interfaces. The Pd@ZnO loaded WO NFs were found to exhibit unparalleled toluene sensitivity (R/R = 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.
我们报告了通过静电纺丝将金属-有机骨架（MOF）驱动的金属嵌入金属氧化物（M@MO）复合催化剂异质敏化到半导体金属氧化物（SMO）纳米纤维（NFs）上，从而显著增强化学气体传感。ZIF-8 衍生的负载 Pd 的 ZnO 纳米立方体（Pd@ZnO）敏化在 WO NFs 的内部和外部，形成多异质结 Pd-ZnO 和 ZnO-WO 界面。负载 Pd@ZnO 的 WO NFs 被发现对甲苯具有无与伦比的灵敏度（R/R = 4.37 至 100 ppb）、快速的气体响应速度（∼20 s）和对其他干扰气体的优异交叉选择性。这些结果表明，MOF 衍生的 M@MO 复合催化剂可以在静电纺丝纳米纤维支架内功能化，从而形成多异质结，这对于提高催化传感器的敏化作用至关重要。
