Abstract:
The most studied 2D nanosheet is graphene whereas covalent
organic frameworks and hexagonal boron nitride are the new
addition to this family of nanomaterials.[1–3] These ultrathin,
atomic, or sub-nanometer layers of 2D materials are in demand
owing to their exceptional electronic, optical, thermal, and
mechanical properties with high degree of anisotropy for applications
in flexible optoelectronics, catalysis, bioimaging, and
energy storage.[4–6] During the past two decades, supramolecular
chemistry has been exploited for the creation of a variety
of 0D, 1D, 2D, and 3D nanomaterials.[7–15] In most of the cases,
spontaneous self-assembly of organic molecules leads to 1D
structures, but preparation of the corresponding 2D sheets of a
few layer thickness is a challenge.[16–19] 2D sheets of fluorescent
molecules are required for display and sensing applications,
however, organic 2D nanosheets having high fluorescence
quantum yield is difficult to achieve due to the fluorescence
self-quenching.[20,21] Another important requirement of organic
2D and 3D materials is high anisotropic charge-carrier mobility
which is useful for the fabrication of organic field-effect transistors
(OFETs) and organic solar cells.[22,23] Therefore, for flexible
organic electronics, it is necessary to have a few layered 2D
sheets with high fluorescen
