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    Highly Efficiently Delaminated Single-Layered MXene Nanosheets with Large Lateral Size

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    Single layered Ti<sub>3</sub>C<sub>2</sub>(OH)<sub>2</sub> nanosheets have been successfully fabricated by etching its Ti<sub>3</sub>AlC<sub>2</sub> precursor with KOH in the presence of a small amount of water. The OH group replaced the Al layer within the Ti<sub>3</sub>AlC<sub>2</sub> structure during etching, and Ti<sub>3</sub>C<sub>2</sub>(OH)<sub>2</sub> nanosheets could be easily and efficiently achieved through a simple washing process. The delaminated single-layered nanosheets are clearly revealed by atomic force microscopy to be several micrometers in lateral size. Interestingly, the exfoliated Ti<sub>3</sub>C<sub>2</sub>(OH)<sub>2</sub> nanosheets could be restacked to form a new layer-structured material after drying. When redispersing this restacked Ti<sub>3</sub>C<sub>2</sub>(OH)<sub>2</sub> materials in water again, it could be re-delaminated easily only after shaking for several hours. The easy delamination and restacking properties, coupled with intrinsic metallic conductivity and hydrophilicity, make it an ideal two-dimensional building block for fabricating a wide variety of functional materials
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