Data_Sheet_1_One-Dimensional Zinc Oxide Decorated Cobalt Oxide Nanospheres for Enhanced Gas-Sensing Properties.PDF

In this study, one-dimensional (1D) zinc oxide was loaded on the surface of cobalt oxide microspheres, which were assembled by single-crystalline porous nanosheets, via a simple heteroepitaxial growth process. This elaborate structure possessed an excellent transducer function from the single-crystalline feature of Co3O4 nanosheets and the receptor function from the zinc oxide nanorods. The structure of the as-prepared hybrid was confirmed via a Scanning Electron Microscope (SEM), X-ray diffraction (XRD), and a Transmission Electron Microscope (TEM). Gas-sensing tests showed that the gas-sensing properties of the as-designed hybrid were largely improved. The response was about 161 (Ra/Rg) to 100 ppm ethanol, which is 110 and 10 times higher than that of Co3O4 (Rg/Ra = 1.47) and ZnO (Ra/Rg = 15), respectively. And the as-designed ZnO/Co3O4 hybrid also showed a high selectivity to ethanol. The superior gas-sensing properties were mainly attributed to the as-designed nanostructures that contained a super transducer function and a super receptor function. The design strategy for gas-sensing materials in this work shed a new light on the exploration of high-performance gas sensors.

本研究通过简便的异质外延生长工艺，将一维（1D）氧化锌负载于由单晶多孔纳米片组装而成的四氧化三钴微球表面。该精巧构筑的结构兼具优异的换能功能与受体功能：换能功能源自四氧化三钴纳米片的单晶特性，受体功能则来源于氧化锌纳米棒。研究通过扫描电子显微镜（Scanning Electron Microscope, SEM）、X射线衍射（X-ray Diffraction, XRD）与透射电子显微镜（Transmission Electron Microscope, TEM）表征并确认了所制备杂化材料的结构。气敏测试结果表明，所设计的杂化材料气敏性能得到大幅提升。针对100 ppm乙醇的响应值约为161（Ra/Rg），分别是四氧化三钴（Co3O4，Rg/Ra=1.47）与氧化锌（ZnO，Ra/Rg=15）的110倍和10倍。所制备的ZnO/Co3O4杂化材料对乙醇亦表现出优异的选择性。该优异气敏性能主要归因于该设计的纳米结构兼具超强换能功能与超高受体吸附功能。本研究提出的气敏材料设计策略，为高性能气体传感器的探索提供了新的思路。