Ye Wen, He Jing-Hui, Cao Qiang, Sun Wu-Ji, Wang Jia, Chen Ze-Kun, Cheng Xue-Feng, Yu Chuang, Lu Jian-Mei
College of Chemistry Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, National United Engineering Laboratory of Functionalized Environmental Adsorption Materials, Soochow University, Suzhou, 215123, P. R. China.
Adv Mater. 2021 Jun;33(24):e2100674. doi: 10.1002/adma.202100674. Epub 2021 May 7.
Owing to their special photoelectric properties, halide perovskites have always attracted research attention. Hollow-structured halide perovskites have many practical applications but are challenging to prepare as most template methods violate their poor chemical and thermal stability. In this study, novel halide perovskite Cs PdBr hollow nanospheres are prepared using a template-free method; specifically, large quantities of highly pure lead-free halide perovskite Cs PdBr hollow nanospheres are produced at 30 °C without a surfactant. These ultrapure nanospheres exhibit superiority in chemresistive detection of CO with a detection limit of 50 ppb, which is the lowest among all the reported CO sensing materials. Moreover, in situ sum-frequency-generation spectra and density functional theory calculations reveal that the high sensitivity is attributable to the large specific surface area and surfactant-free surface of rich Br vacancies that favor CO binding. Overall, this work provides insight on regulation of the halide perovskite structure and the use of hollow spheres in gas-sensing applications.
由于其特殊的光电特性，卤化物钙钛矿一直吸引着研究关注。中空结构的卤化物钙钛矿有许多实际应用，但制备具有挑战性，因为大多数模板法会破坏其较差的化学和热稳定性。在本研究中，采用无模板法制备了新型卤化物钙钛矿Cs PdBr中空纳米球；具体而言，在30°C下无需表面活性剂即可大量制备高纯度的无铅卤化物钙钛矿Cs PdBr中空纳米球。这些超纯纳米球在CO的化学电阻检测中表现出优越性，检测限为50 ppb，这是所有报道的CO传感材料中最低的。此外，原位和频光谱和密度泛函理论计算表明，高灵敏度归因于大的比表面积和富含Br空位的无表面活性剂表面，有利于CO结合。总体而言，这项工作为卤化物钙钛矿结构的调控以及中空球体在气体传感应用中的使用提供了见解。
