Highly Porous Double-Shelled Hollow Hematite Nanoparticles for Gas Sensing
Highly Porous Double-Shelled Hollow Hematite Nanoparticles for Gas Sensing
复制标题
DOI：
10.1021/acsanm.9b00228
复制
发表时间：
2019-03
影响因子：
5.9
通讯作者：
Tiantian Ma;Lingli Zheng;Yingqiang Zhao;Yongshan Xu;Jun Zhang;Xianghong Liu
中科院分区：
文献类型：
--
作者：
Tiantian Ma;Lingli Zheng;Yingqiang Zhao;Yongshan Xu;Jun Zhang;Xianghong Liu
多壳中空微/纳米结构由于其迷人的性质而具有各种重要应用的巨大潜力。然而，多壳中空微/纳米结构的合成主要依赖于模板参与的方法。用于多壳中空结构的无模板方案仍然相当具有挑战性。在这项工作中，一个解决方案的战略的基础上由内而外和由外向内奥斯特瓦尔德成熟的操作赤铁矿空心球与单或双壳，而不使用任何硬或软模板。对赤铁矿空心球的结构演化进行了全面的研究，揭示了其形成机理。作为一个潜在的应用，赤铁矿空心球已被用于化学气体传感器，以研究结构与性能的相关性。结果表明，由于结构敏化作用，双层壳结构的赤铁矿球比单层壳结构的赤铁矿球具有更高的响应。通过对传感器的优化设计，进一步提高了传感器的响应速度。
Multishelled hollow micro/nanostructures hold great potential for a variety of important applications due to their fascinating properties. However, the synthesis of multishelled hollow micro/nanostructures mainly relies on template-involved methods. A template-free protocol for multishelled hollow structures remains quite challenging. In this work, a solution strategy based on inside-out and outside-in Ostwald ripening is developed to manipulate hematite hollow spheres with single or double shells without using any hard or soft templates. The structure evolution of the hematite hollow spheres is comprehensively studied to reveal the formation mechanism. As a potential application, the hematite hollow spheres have been utilized for chemical gas sensors to investigate the structure–property correlations. Results demonstrate that the double-shelled hematite spheres exhibit much higher response than the single-shelled ones due to structure sensitization. An improved sensor response is further obtained by cata...