Ma Ya-Fei, Zhang Mei-Li, Lu Xue-Ying, Ren Yi-Xia, Yang Xiao-Gang
Department of Chemistry and Chemical Engineering, Laboratory of New Energy ＆ New Function Materials, Yan'an University, Yan'an, Shaanxi 716000, PR China.
Department of Chemistry and Chemical Engineering, Laboratory of New Energy ＆ New Function Materials, Yan'an University, Yan'an, Shaanxi 716000, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Jan 15;325:125152. doi: 10.1016/j.saa.2024.125152. Epub 2024 Sep 17.
As donors for effective energy transfer, metal-organic frameworks (MOFs) have attracted the attention of many experts in the field of artificial light-harvesting materials. This study introduces a novel two-dimensional Zn-MOF, synthesized using flexible 1,3-phenyldiacetic acid (Hmpda) and rigid 1,3,5-tris(1-imidazolyl)benzene (tib) as organic ligands. Through atomic force microscopy (AFM), we have determined the monolayer thickness of this novel material to be 5 nm. Achieving two-dimensional Zn-MOF nanosheets with large BET surface area was made possible by employing ultrasonic stripping techniques. The fluorescence emission spectrum of Zn-MOF nanosheets overlaps with the UV-vis absorption spectrum of coumarin 6 (CM6), so they can be used as a donor and acceptor for fluorescence resonance energy transfer (FRET) to construct an artificial light-harvesting system (ALHS). Compared with single crystal Zn-MOF, CM6@Zn-MOF(2) has a larger BET surface area (41 m/g), higher quantum yield (Φ, 30.56 %), narrower energy gap (E, 2.87 eV), and the light-harvesting range extends to the visible green light area. Notably, CM6@Zn-MOF(2) demonstrates a robust photocurrent response, characterized by a photocurrent on/off ratio (I/I) of 21, and a maximum photocurrent density that surpasses that of pure Zn-MOF (2.25:1). This study successfully designed a high-performance photoelectric conversion material CM6@Zn-MOF(2), which laid a certain theoretical foundation for new artificial optical acquisition systems and electrochemical material selection.
作为有效的能量转移供体，金属有机框架（MOF）已引起人工光捕获材料领域众多专家的关注。本研究介绍了一种新型二维锌基金属有机框架，它是使用柔性的1,3 - 苯二乙酸（Hmpda）和刚性的1,3,5 - 三（1 - 咪唑基）苯（tib）作为有机配体合成的。通过原子力显微镜（AFM），我们确定这种新型材料的单层厚度为5纳米。采用超声剥离技术使得制备具有大比表面积的二维锌基金属有机框架纳米片成为可能。锌基金属有机框架纳米片的荧光发射光谱与香豆素6（CM6）的紫外 - 可见吸收光谱重叠，因此它们可作为荧光共振能量转移（FRET）的供体和受体，以构建人工光捕获系统（ALHS）。与单晶锌基金属有机框架相比，CM6@Zn - MOF(2)具有更大的比表面积（41 m²/g）、更高的量子产率（Φ，30.56%）、更窄的能隙（E，2.87 eV），并且光捕获范围扩展到可见绿光区域。值得注意的是，CM6@Zn - MOF(2)表现出强劲的光电流响应，其光电流开/关比（I/I）为21，最大光电流密度超过纯锌基金属有机框架（2.25:1）。本研究成功设计了一种高性能光电转换材料CM6@Zn - MOF(2)，为新型人工光学采集系统和电化学材料选择奠定了一定的理论基础。
