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Shear Exfoliated Metal-Organic Framework Nanosheet Enabled Flexible Sensor for Real-Time Monitoring of Superoxide Anion.

Recently, two dimensional metal-organic framework (2D MOF) nanosheets have drawn broad attention on account of their various advantages, like ultrathin thickness, ultra-large specific surface area, abundant accessible active sites, favorable solution dispersion properties and ease of designability. However, up to now, it's still difficult to produce 2D MOF nanosheets in large-scale production, which hinders the practical applications of 2D MOF nanosheets. Here, for the first time, we introduced a novel shear exfoliation method to scalable prepare 2D MOF nanosheets by using a commercial blender. As a proof of concept, we used two kind of layer-structured MOFs (ELM-12, Cu(bpy)2(OTf)2, bpy = 4,4-bipyridine, OTf = trifluoromethanesulfonate and Zn2(bim)4, bim = benzimidazole) as samples to prepare MOF nanosheets. The thickness of the obtained two kinds of MOF nanosheets is achieved at 3-5 nm. Notably, the exfoliated MOF nanosheets (ELM-12) shows improved electrochemical catalytic activity compared with its bulk counterpart. Based on this, ELM-12 nanosheet based flexible sensor was developed for detecting superoxide anions (O2•-) released from cancer cells. The fabricated flexible sensor displays excellent sensitivity, selectivity, flexibility, stability and reproducibility.