Cai Ren, Yang Dan, Yan Liang, Tian Feng, Zhang Jichao, Lyu Yifan, Chen Kangfu, Hong Chengyi, Chen Xigao, Zhao Yuliang, Chen Zhuo, Tan Weihong
Center for Research at Bio/Nano Interface, Department of Chemistry and Department of Physiology and Functional Genomics, Health Cancer Center, UF Genetics Institute and McKnight Brain Institute, University of Florida, Gainesville, Florida 32611-7200, United States.
Molecular Science and Biomedicine Laboratory, State Key Laboratory for Chemo/Bio Sensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan University, Hunan University, Changsha 410082, China.
ACS Appl Nano Mater. 2018;1(10):5389-5395. doi: 10.1021/acsanm.8b01380. Epub 2018 Sep 14.
The organization of nanoparticles (NPs) with controlled chemical composition and size distribution into well-defined sheets will find many practical applications, but the chemistry remains problematic. Therefore, we report a facile method to assemble NPs to free-floating two-dimensional (2D) nanosheets with a superlattice and thicknesses reaching 22.8 nm. The ligand oleic acid is critical in the formation of nanosheets. As assembled, these free-floating 2D nanosheets remain intact in both polar and nonpolar solvents, e.g., deionized water, ethanol, -dimethylformamide, dimethyl sulfoxide, toluene, hexane, and chloroform, without any disassembly. Compared to FeO NP building blocks, these 2D nanosheets show more favorable catalytic properties and enhanced catalytic reactivity, which can be exploited to mimic natural enzymes. Our work is expected to open up a new avenue for synthesizing free-floating 2D supersheets by NP assembly, leading to a new generation of materials with enriched functions and broader applications.
将具有可控化学成分和尺寸分布的纳米颗粒（NPs）组装成结构明确的薄片将有许多实际应用，但相关化学过程仍存在问题。因此，我们报告了一种简便方法，可将NPs组装成具有超晶格且厚度达22.8 nm的自由漂浮二维（2D）纳米薄片。配体油酸在纳米薄片的形成中至关重要。组装后的这些自由漂浮2D纳米薄片在极性和非极性溶剂（如去离子水、乙醇、二甲基甲酰胺、二甲基亚砜、甲苯、己烷和氯仿）中均保持完整，不会发生任何拆解。与FeO NP构建块相比，这些2D纳米薄片表现出更优异的催化性能和增强的催化反应活性，可用于模拟天然酶。我们的工作有望为通过NP组装合成自由漂浮2D超薄片开辟一条新途径，从而产生具有丰富功能和更广泛应用的新一代材料。
