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cTwo-dimensional nanostructures,such as nanosheets and nanoribbons,represent the excellent dimension for efficient transport of electrons and excitons and thus are ideal building blocks for hierarchical assembly of functional microscale electronic and photonic structures.We report a convenient and scalable solution approach for the hierarchical assembly of two-dimensional nanosheets on polyimide substrates to obtain flexible thin films.The nanosheets were fabricated by a simple hydrothermal process.