郑州轻工业学院张永辉团队报道了空间自约束共结晶制备用于气敏的结晶多孔金属氧化物纳米片。相关研究成果发表在2022年7月16日出版的《德国应用化学》。

由于大的表面体积比和量子限制效应，结晶金属氧化物纳米片表现出优异的催化性能。然而，开发一种简便和通用的方法来合成金属氧化物纳米片仍然是一个挑战。

该文中，研究人员报告了一种共结晶诱导的空间自约束方法来合成金属氧化物纳米片。以SnO₂的合成为例，KCl和SnCl₂溶液中的溶剂蒸发诱导KCl和K₂SnCl₆共结晶，得到的封装K₂SnCl₆复合材料可以原位转化为限制在KCl基质中的SnO₂纳米片，水洗去除KCl后，可以获得多孔SnO₂纳米片。

值得注意的是，通过这种通用而高效的绿色路线可以获得一系列金属氧化物纳米片。特别是，具有改进的表面O物种和丰富的氧空位的多孔CeO₂/SnO₂纳米片表现出优于3-羟基-2-丁酮的气敏性能。

附：英文原文

Title: Cocrystallization Enabled Spatial Self-Confinement Gives Crystalline Porous Metal Oxide Nanosheets for Gas Sensing

Author: Xuanyu Yang, Yatong Shi, Kefeng Xie, Shaoming Fang, Yong-Hui Zhang, Yonghui Deng

Issue&Volume: 2022-07-16

Abstract: Crystalline metal oxide nanosheets show exceptional catalytic performance owing to the large surface-to-volume ratio and quantum confinement effect. However, it is still a challenge to develop a facial and general method to synthesize metal oxide nanosheets. Herein, we report a cocrystallization induced spatial self-confinement approach to synthesize metal oxide nanosheets. Taking the synthesis of SnO2 as an example, the solvent evaporation from KCl and SnCl2 solution induces the cocrystallization of KCl and K2SnCl6, and the obtained composite with encapsulated K2SnCl6 can be in-situ converted into SnO2 nanosheets confined in KCl matrix, after water washing to remove KCl, porous SnO2 nanosheets can be obtained. Notably, a series of metal oxide nanosheets can be obtained through this general and efficient green route. In particular, porous CeO2/SnO2 nanosheets with improved surface O- species and abundant oxygen vacancies exhibit superior gas sensing performance to 3-hydroxy-2-butanone.

DOI: 10.1002/anie.202207816

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202207816