Metal–organic framework nanosheets for fast-response and highly sensitive luminescent sensing of Fe³⁺

Abstract

The first luminescent two-dimensional MOF nanosheets NTU-9-NS Ti2(HDOBDC)2(H2DOBDC) (H2DOBDC=2,5dihydroxyterephthalic acid) fabricated via top-down delamination have been realized for fast-response and highly sensitive sensing of Fe 3+ . The highly dispersive nature and high accessible active sites on the surface of the 2D NTU-9-NS nanosheets enable them to have close contact with targeted metal ions, which led to fast-response and highly sensitive sensing of Fe 3+ ions, with the response time within seconds and the best detection limit performance of 0.45 µM among MOF materials. The fast-response and highly sensitive Fe 3+ sensing based on the NTU-9-NS nanosheets sensor material highlights the very promise of luminescent sensing applications of two-dimensional MOF nanosheet approach. This work contributes to develop the research on two-dimensional MOF nanosheets materials with targeted and specific recognition for the biological and environmental luminescent sensors.

Structural Engineering of Low‐Dimensional Metal–Organic Frameworks: Synthesis, Properties, and Applications

“…[75,322] For example, Zhu and co-workers reported the fabrication of Cd-BTC MOF nanotube for trace-level detection of nitroaromatic explosives. [323] The excellent luminescent sensing ability of NTU-9-NS could be ascribed to highly accessible active sites on the surface of nanosheets. The response rate of Cd-BTC nanotube for 2,4-dinitrotoluene vapor was also among the highest values for reported fluorescence-based chemical sensing materials, which is due to their unique composition and structural advantages of LD MOFs.…”

Two‐Dimensional Metal–Organic Framework Nanosheets

“…Theoretical calculations have proven that if the surface energy of the solvent is close to that of graphene, the resultant graphene nanosheets can be effectively dispersed in that solvent due to the low driving force for re‐aggregation . Other solvents, such as methanol, ethanol, isopropyl alcohol, and N,N‐dimethylformamide (DMF) have also been used for the exfoliation of 2D MOFs.…”

Confined Synthesis of 2D Nanostructured Materials toward Electrocatalysis

“…Recently, 2D MOFs have attracted considerable interest in the electrocatalysis field due to their porous structure, which can efficiently expose active metal centers and promote fast mass/ion transport 90,91. Conventionally, 2D MOF nanosheets can be prepared by various methods, such as liquid exfoliation,92–95 layer‐by‐layer growth,96–98 and surfactant‐assisted synthesis 99,100. Alternatively, 2D confined synthesis provides a new approach to prepare 2D MOFs.…”