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. 2020 Apr 14;10(4):747.
doi: 10.3390/nano10040747.

Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology

Athanasia Kostopoulou  1 , Konstantinos Brintakis  1 , Efthymis Serpetzoglou  1   2 , Emmanuel Stratakis  1   2
Affiliations

Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology

Athanasia Kostopoulou et al. Nanomaterials (Basel). .

Abstract

We report on a facile and rapid photo-induced process to conjugate graphene-based materials with metal-halide perovskite nanocrystals. We show that a small number of laser pulses is sufficient to decorate the 2-dimensional (2D) flakes with metal-halide nanocrystals without affecting their primary morphology. At the same time, the density of anchored nanocrystals could be finely tuned by the number of irradiation pulses. This facile and rapid room temperature method provides unique opportunities for the design and development of perovskite-2D nanoconjugates, exhibiting synergetic functionality by combining nanocrystals of different morphologies and chemical phases with various 2D materials.

Keywords: 2D materials; anion exchange; graphene oxide; laser-induced synthesis; nanoparticles; photo-induced processes; synergistic effects.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Schematic representation and (b) photograph of the setup of the photo-induced process using a femtosecond laser.
Figure 2
Figure 2
(a) High resolution TEM (HRTEM) image of the all-inorganic metal halide nanohexagons dispersed in dichlorobenzene. Insets: The fast Fourier transform (FFT) pattern of the HRTEM image of the individual nanohexagon (upper image) and colloidal solution photograph (under UV illumination, λ = 365 nm) (bottom image); (b) XRD pattern of the same sample. The reference patterns of the rhombohedral Cs4PbBr6 crystal structure (ICSD-025124) and the orthorhombic (ICSD-97851) are also provided for comparison (red and blue pattern in b).
Figure 3
Figure 3
(a–c) TEM images of the exfoliated graphene oxide (GO) in 1,2–dichlorobenzene (DCB), of the metal halide nanocrystals in the same solvent and the mixture of the two before the laser irradiation; (d) Photoluminescence spectra of the same solutions.
Figure 4
Figure 4
(a–g) TEM images of the perovskite–GO nanoconjugates after irradiation from 1 to 106 femtosecond pulses; (h) Photoluminescence of the DCB-based irradiated solutions.
Figure 5
Figure 5
Proposed mechanism of the anchoring of metal nanocrystals on the GO flakes.
See this image and copyright information in PMC

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