Abstract A new type of hierarchically nonspherical architecture with sandwich-structured multilayer nanosheets has been successfully prepared via a controllable multistep approach in case of SnO2/Fe2O3 heterostructures. The morphological characterization reveals that unique sandwich-structured SnO2/Fe2O3 multilayer nanosheets (MNSs) are constructed via the self-assembly of densely well-aligned Fe2O3 nanorod layers to cover and fill the interlayers of hexagonal SnO2 hollow multilayer nanosheets (HMNs). When used as the sensing materials for acetone detection, the sandwich hetero-nanostructures demonstrate evidently improved sensing performance compared to pure SnO2. The significantly improved sensing performance can be attributed not only to the rational microstructures for fast transfer of gas molecules, but also to the additional effects of loaded Fe2O3 ultrathin nanorods.

中文翻译：

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用于高灵敏度丙酮检测的三明治结构SnO 2 /Fe 2 O 3 多层纳米片的可控组装

摘要 在 SnO2/Fe2O3 异质结构的情况下，通过可控的多步方法成功制备了一种具有夹层结构的多层纳米片的新型分层非球形结构。形态表征表明，独特的三明治结构的 SnO2/Fe2O3 多层纳米片 (MNS) 是通过密集排列良好的 Fe2O3 纳米棒层的自组装来构建的，以覆盖和填充六边形 SnO2 中空多层纳米片 (HMN) 的夹层。当用作丙酮检测的传感材料时，与纯 SnO2 相比，夹心异质纳米结构显示出明显改善的传感性能。显着改善的传感性能不仅可以归因于气体分子快速转移的合理微观结构，