State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China.
Nanoscale. 2016 Mar 14;8(10):5446-53. doi: 10.1039/c5nr06308f.
Metal oxides with hierarchical microstructures have attracted tremendous attention with respect to their enhanced gas sensing properties. Herein, we reported the facile synthesis of hierarchical ZnFe2O4 yolk-shell microspheres via a template-free solvothermal strategy and the subsequent annealing and chemical etching process. Electron microscopy images undoubtedly demonstrated that the novel ZnFe2O4 architecture was constructed of a large number of nanosheet subunits with a thickness around 20 nm. As a proof-of-concept demonstration of the function, when evaluated as gas sensing materials, the as-prepared ZnFe2O4 yolk-shell microspheres manifested an extremely high response and a low detection limit to acetone at the operating temperature of 200 °C. Significantly, the response to 20 ppm acetone was retained well even after 200 cycles and continuous measurement for 30 days, indicating superior cyclability and long-term stability.
具有分级微结构的金属氧化物因其增强的气体传感性能而受到极大关注。在此，我们通过无模板溶剂热策略以及随后的退火和化学刻蚀过程，报道了分级 ZnFe2O4 蛋黄壳微球的简便合成。电子显微镜图像无疑表明，新型 ZnFe2O4 结构由大量厚度约为 20nm 的纳米片亚单位构成。作为功能的概念验证演示，当用作气体传感材料时，所制备的 ZnFe2O4 蛋黄壳微球在 200°C 的工作温度下对丙酮表现出极高的响应和低检测限。显著的是，即使在 200 个循环后以及连续测量 30 天后，对 20ppm 丙酮的响应仍保持良好，表明其具有卓越的循环稳定性和长期稳定性。
