A Highly Solvent-Stable Metal-Organic Framework Nanosheet: Morphology Control, Exfoliation, and Luminescent Property
A Highly Solvent-Stable Metal-Organic Framework Nanosheet: Morphology Control, Exfoliation, and Luminescent Property
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高度溶剂稳定的金属有机框架纳米片：形态控制、剥落和发光特性
DOI：
10.1002/smll.201703873
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发表时间：
2018-04-26
期刊：
影响因子：
13.3
通讯作者：
Ma, Jing
中科院分区：
文献类型：
--
作者：
Han, Li-Juan;Zheng, Dong;Ma, Jing
与块体金属有机骨架（MOF）相比，二维MOF纳米片由于其厚度小、表面积大且具有高度可及的活性位点而获得了广泛的研究关注。然而，结构劣化和形态损伤阻碍了在剥离期间产生高质量的MOF纳米片。在这里，首先合成了一种新的层状块状M0 F剥离剂B-I，并调查了几种溶剂如异丙醇、甲醇、正己醇和N，N-二甲基甲酰胺，以检查它们对层状M0 F剥离剂B-I的剥离性能。结果，在正己醇中通过软物理方法获得了高度溶剂稳定的金属有机框架矩形纳米片，其保持未损坏的形态。理论模拟表明，正己醇和MOF层之间的强相互作用能是使块状MOF成为纳米片的最佳剥离性能的原因。此外，通过简单地改变溶剂和形态，BCLB-1显示出可调的荧光峰位置、荧光寿命和量子产率。此外，还将其作为荧光传感器用于金属离子的检测，并对Fe 3+离子进行了检测。值得注意的是，与其本体对应物相比，PIB-1纳米片具有更好的检测限性能，为0.054 × 10（-6）m。
Compared to bulk metal-organic framework (MOF), 2D MOF nanosheets have gained intensive research attention due to their ultrathin thickness and large surface area with highly accessible active sites. However, structural deterioration and morphological damage have impeded producing high-quality MOF nanosheets during exfoliation. Here, first a new layered bulk MOF ZSB-1 is synthesized and several solvents such as isopropanol, methanol, n-hexyl alcohol, and N,N-dimethylformamide are surveyed to examine their performance for the exfoliation of layered ZSB-1. As a result, a highly solvent-stable metal-organic framework rectangular nanosheet retaining undamaged morphology is obtained by the soft-physical method in n-hexyl alcohol. Theoretical simulations reveal that the strong interaction energy between n-hexyl alcohol and MOF layers is responsible for the best exfoliation performance of making the bulk MOF into nanosheets. In addition, ZSB-1 shows a tunable fluorescence peak position, fluorescent lifetime, and quantum yield by simply changing the solvent and morphology. Besides, the ZSB-1 was selected as a fluorescence sensor to detect metal ions, and ZSB-1 nanosheet exhibits excellent sensing ability for Fe3+. It is worth noting that the ZSB-1 nanosheet has better detection limit performance of 0.054 x 10(-6) m than that of its bulk counterpart.