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Download fileDirect Synthesis of Unilamellar MgAl-LDH Nanosheets and Stacking in Aqueous Solution
journal contribution
posted on 17.11.2015, 00:00 authored by Dujuan Liang, Wenbo Yue, Genban Sun, Dong Zheng, Kenta Ooi, Xiaojing YangTwo-dimensional (2D) materials, such
as graphene, inorganic oxides,
and hydroxides, are one of the most extensively studied classes of
materials due to their unilamellar crystallites or nanosheet structures.
In this study, instead of using the universal exfoliation method of
the bulky crystal precursor, 2D crystals/nanosheets of MgAl-layered
double hydroxides (LDHs) were synthesized in formamide. We propose
that the obtained crystals are unilamellar according to the XRD, TEM,
and AFM observations. The HRTEM and fast Fourier transform images
confirm that the crystal structures are the same as those of the exfoliated
MgAl-LDH nanosheets. The directly synthesized sheets can stack into
a 3D crystal structure, which is the same as that of typical LDHs
except for the disordered orientation of the a-/b- crystal axis of each sheet. This result provides not
only a novel approach to the preparation of 2D crystals but also insight
into the formation mechanism of LDHs.