Active Polymer-Templated Porous Metal Oxide Nanospheres with Tailored Single-Atom Modification for Olfactory Intelligence
Keyu Chen, Li‐Yuan Zhu, Jianwu Wang, Wenhe Xie, Yu Deng, Lingxiao Xue, Huan Long, Huan Long, Jing Ren, Kaiping Yuan, Wei Wang, Qunyan Yao, Dongyuan Zhao, Xiaodong Chen, Yonghui Deng, Yonghui Deng, Yonghui Deng
Abstract
High Resolution Image Download MS PowerPoint Slide Controllable synthesis of monodisperse porous metal oxide semiconductor (MOS) nanospheres with uniform size and a tailored chemical environment is highly desired in the compatible manufacturing of high-performance nanodevices. However, the lack of an effective synthesis method has been a crucial challenge due to the uncontrollable hydrolysis rate of precursors and insufficient coassembly driving force. Herein, an active colloidal polymer-directing method is proposed for the facile synthesis of uniform functionalized mesoporous MOS nanospheres, such as mesoporous SnO 2 nanospheres with different single-atom modifications (SA/mSnO 2 ). This synthesis method features the utilization of single-atom-modified mesoporous polydopamine nanospheres as the intermediate, whose phenolic hydroxyl and imine groups enable the formation of the SnO 2 skeleton and stabilization of SA, respectively. A library of stable gas-sensing inks is prepared based on the obtained SA/mSnO 2 nanospheres, enabling wafer-scale fabrication of sensing layers on microelectromechanical systems chips through high-speed printing. These as-fabricated SA/mSnO 2 sensors exhibit tailored selectivity due to different single-atom modifications, high sensitivity (5.6 times higher than that of commercial sensors), and excellent device-to-device consistency. Furthermore, by integrating different SA/mSnO 2 nanodevices into sensor arrays, an advanced intelligent olfactory system is produced and further integrated into an automated guided vehicle, enabling the autonomous identification and transport of low-concentration leaked chemicals.