螺旋二维(2D)纳米片由于其扭曲的结构而表现出独特的物理和化学现象。虽然团簇的自组装是形成多级2D结构的理想策略,但形成螺旋纳米片具有挑战性。
该文中,研究人员首次报道了一种涉及螺旋位错的组装方法,以获得具有均匀正方形形态的2D螺旋簇组装纳米片(CANs)。在熔融嵌段共聚物Pluronic F127的存在下,通过组装1–2 nm的Ru簇,制备了长度约为4μm、每层厚度为20.7±3.0 nm的2D螺旋Ru CANs。冷冻电子显微镜(Cryo-EM)和高角度环形暗场扫描透射电子显微镜(HAADF-STEM)证明了螺旋组装结构中存在螺旋位错。
X射线吸收精细结构光谱表明,Ru团簇是Ru3+物种,Ru原子主要与Cl配位,配位数为6.5。傅立叶变换红外光谱(FT-IR)和固态核磁共振氢光谱(1H NMR)表明,Ru团簇的组装过程是由非共价相互作用形成的,包括氢键和亲水相互作用。此外,Ru-F127 CANs在近红外(NIR)区域表现出优异的光热转换性能。
附:英文原文
Title: Spiral Square Nanosheets Assembled from Ru Clusters
Author: Haohui Hu, Xiao Han, Geng Wu, Zhentao Ma, Bei Wu, Muyu Yan, Xingen Lin, Xusheng Zheng, Xun Hong
Issue&Volume: May 24, 2023
Abstract: Spiral two-dimensional (2D) nanosheets exhibit unique physical and chemical phenomena due to their twisted structures. While self-assembly of clusters is an ideal strategy to form hierarchical 2D structures, it is challenging to form spiral nanosheets. Herein, we first report a screw dislocation involved assembled method to obtain 2D spiral cluster assembled nanosheets (CANs) with uniform square morphology. The 2D spiral Ru CANs with a length of approximately 4 μm and thickness of 20.7 ± 3.0 nm per layer were prepared via the assembly of 1–2 nm Ru clusters in the presence of molten block copolymer Pluronic F127. Cryo-electron microscopy (cryo-EM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) demonstrate the existence of screw dislocation in the spiral assembled structure. The X-ray absorption fine structure spectrum indicates that Ru clusters are Ru3+ species, and Ru atoms are mainly coordinated with Cl with a coordination number of 6.5. Fourier-transform infrared (FT-IR) spectra and solid-state nuclear magnetic resonance hydrogen spectra (1H NMR) indicate that the assembly process of Ru clusters is formed by noncovalent interactions, including hydrogen bonding and hydrophilic interactions. Additionally, the Ru-F127 CANs exhibit excellent photothermal conversion performance in the near-infrared (NIR) region.
DOI: 10.1021/jacs.3c01738
Source: https://pubs.acs.org/doi/10.1021/jacs.3c01738
JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:16.383
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