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

Athanasia Kostopoulou,Efthymis Serpetzoglou,Emmanuel Stratakis,Konstantinos Brintakis

doi:10.3390/nano10040747

Athanasia Kostopoulou, Efthymis Serpetzoglou + Show 2 more

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https://doi.org/10.3390/nano10040747

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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.

Highlights

Nanoconjugates consisting of nanocrystals coupled with graphene-based materials have recently attracted the interest of the scientific community for their synergistic properties originating from the coupling of the two different materials [1,2,3,4,5,6,7]
The coupling of these 2D materials with semiconducting quantum dots, mainly synthesized in colloidal solutions, explores the usage of these materials in light-harvesting [12], as catalysts for oxygen reduction in fuel cells [2], electrocatalysts for water splitting [5], as well as in Li-ion batteries [3] derived from the energy and charge transfer, [4,13] or synergetic and enhanced properties [5,14] of the complex structures
The metal halide perovskite nanocrystals are a new class of nanomaterials; their properties can be modified by tuning the halide component [20], or by altering their dimensionality or morphology [21,22]

Summary

Introduction

Nanoconjugates consisting of nanocrystals coupled with graphene-based materials have recently attracted the interest of the scientific community for their synergistic properties originating from the coupling of the two different materials [1,2,3,4,5,6,7]. The ions Cl− and I− can partially or totally substitute Br− in the crystal structure of the CsPbBr3 through a chemical anion exchange reaction in solution [20,23] or by a photo-induced process in a Cl− or I− containing solvent [24] In such thin nanocrystals, the optical properties may be tuned by modifying the thickness of them (nanoplatelets) [25,26]

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