Constructing
nanoparticles into well-defined structures at mesoscale
and larger to create novel functional materials remains a challenge.
Inspired by atomic epitaxial growth, we propose an “epitaxial
assembly” method to form two-dimensional nanoparticle arrays
(2D NAs) directly onto desired materials. As an illustration, we employ
a series of surfactant-capped nanoparticles as the “artificial
atoms” and layered hybrid perovskite (LHP) materials as the
substrates and obtain 2D NAs in a large area with few defects. This
method is universal for nanoparticles with different shapes, sizes,
and compositions and for LHP substrates with different metallic cores.
Raman spectroscopic and X-ray diffraction data support our hypothesis
of epitaxial assembly. The novel method offers new insights into the
controllable assembly of complex functional materials and may push
the development of materials science at the mesoscale