Abstract A unique triple-shelled architecture with nonspherical shape has been successfully synthesized via a controllable multistep approach in case of polycrystalline SnO2 nanoboxes. The morphological characterizations demonstrate that SnO2 triple-shelled hollow boxes (THBs) are hierarchically constructed by numerous SnO2 primary nanoparticles. The formation mechanism of these SnO2 THBs is discussed based on a localized inside-out Ostwald ripening process. When SnO2 THBs are used as sensing material for toluene detection, the improved sensing performance can be attributed to the rational microstructures for fast transfer of gas molecules.

中文翻译：

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用于高灵敏度甲苯检测的多孔 SnO2 三壳中空纳米盒

摘要 在多晶 SnO2 纳米盒的情况下，通过可控的多步方法成功合成了一种具有非球形形状的独特三壳结构。形态特征表明，SnO2 三壳空心盒 (THB) 是由许多 SnO2 初级纳米粒子分层构建的。这些 SnO2 THB 的形成机制基于局部的由内而外的 Ostwald 成熟过程进行讨论。当 SnO2 THB 用作甲苯检测的传感材料时，改进的传感性能可归因于气体分子快速转移的合理微观结构。