2 research outputs found
Nanocomposite Pattern-Mediated Magnetic Interactions for Localized Deposition of Nanomaterials
We present a method to create, align,
and locate magnetic wires throughout and on the surface of patterned
polymer matrices, following the magnetophoretic transport and self-assembly
of ferromagnetic nanoparticles under a static magnetic field during
laser photopolymerization of monomer/nanoparticle casted solutions.
The resulting films have the ability to attract and immobilize small
quantities of magnetic nanomaterials locally on the ferromagnetic
wires, as proved by a detailed topography study. Magnetic studies
on the films before and after the spontaneous deposition, demonstrate
that the deposited nanomaterials alter significantly the magnetic
character of the system, making thus possible their macroscopic identification.
This offers the possibility to realize sensing devices based on hybrid
materials with magnetic properties
The Role of Surface Tension in the Crystallization of Metal Halide Perovskites
The exciting intrinsic
properties discovered in single crystals
of metal halide perovskites still await their translation into optoelectronic
devices. The poor understanding and control of the crystallization
process of these materials are current bottlenecks retarding the shift
toward single-crystal-based optoelectronics. Here we theoretically
and experimentally elucidate the role of surface tension in the rapid
synthesis of perovskite single crystals by inverse temperature crystallization.
Understanding the nucleation and growth mechanisms enabled us to exploit
surface tension to direct the growth of monocrystalline films of perovskites
(AMX<sub>3</sub>, where A = CH<sub>3</sub>NH<sub>3</sub><sup>+</sup> or MA; M = Pb<sup>2+</sup>, Sn<sup>2+</sup>; X = Br<sup>–</sup>, I<sup>–</sup>) on the solution surface. We achieve up to
1 cm<sup>2</sup>-sized monocrystalline films with thickness on the
order of the charge carrier diffusion length (∼5–10
μm). Our work paves the way to control the crystallization process
of perovskites, including thin-film deposition, which is essential
to advance the performance benchmarks of perovskite optoelectronics