Department of Materials Science and Engineering and Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
Applied Science Research Institute, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
Sci Rep. 2017 Mar 22;7:45074. doi: 10.1038/srep45074.
To achieve the rational design of nanostructures for superior gas sensors, the ultrasmall nanoparticles (NPs) loaded on ternary metal oxide (TMO) hollow spheres (HS) were synthesized by using the polystyrene (PS) sphere template and bimetallic metal-organic framework (BM-MOFs) mold. The zinc and cobalt based zeolite imidazole frameworks (BM-ZIFs) encapsulating ultrasmall Pd NPs (2-3 nm) were assembled on PS spheres at room temperature. After calcination at 450 °C, these nanoscale Pd particles were effectively infiltrated on the surface of ZnO/ZnCoO HSs. In addition, the heterojunctions of Pd-ZnO, Pd-ZnCoO, and ZnO-ZnCoO were formed on each phase. The synthesized Pd-ZnO/ZnCoO HSs exhibited extremely high selectivity toward acetone gas with notable sensitivity (S = 69% to 5 ppm at 250 °C). The results demonstrate that MOF driven ultrasmall catalyst loaded TMO HSs were highly effective platform for high performance chemical gas sensors.
为了实现用于高性能气体传感器的纳米结构的合理设计，通过使用聚苯乙烯（PS）球模板和双金属金属有机骨架（BM-MOFs）模具，合成了负载在三元金属氧化物（TMO）空心球（HS）上的超小纳米颗粒（NPs）。在室温下，将封装有超小 Pd NPs（2-3nm）的锌和钴基沸石咪唑骨架（BM-ZIFs）组装到 PS 球上。在 450°C 下煅烧后，这些纳米级 Pd 颗粒有效地渗透到 ZnO/ZnCoO HS 的表面。此外，在每个相中形成了 Pd-ZnO、Pd-ZnCoO 和 ZnO-ZnCoO 的异质结。合成的 Pd-ZnO/ZnCoO HS 对丙酮气体具有极高的选择性，在 250°C 时对 5 ppm 的灵敏度（S=69%）。结果表明，MOF 驱动的负载 TMO HS 的超小催化剂是高性能化学气体传感器的高效平台。
