Ultrastable Luminescent Hybrid Bromide Perovskite@MOF Nanocomposites for the Degradation of Organic Pollutants in Water

Abstract

Hybrid bromide perovskites (HBPs) have emerged as a promising candidate in optoelectronic applications, although instability of the materials under working conditions has retarded the progress toward commercialization. As a rational approach to address this core issue, we herein report the synthesis of a series of ultrastable composite materials, wherein HBP nanocrystals (NCs) have been stabilized within a well-known chemically stable metal–organic framework (MOF) viz. zeolitic imidazolate framework (ZIF-8) via a pore-encapsulated solvent-directed (PSD) approach. The composites maintain their structural integrity as well as photoluminescence (PL) properties upon dipping into a wide range of polar solvents including water (even in boiling conditions), prolonged exposure to UV irradiation, and elevated temperature for longer periods of time. Further, on the basis of high stability, HBP@MOF composites have been demonstrated as heterogeneous photocatalysts to degrade toxic organic pollutants directly in water.

A hybrid blue perovskite@metal–organic gel (MOG) nanocomposite: simultaneous improvement of luminescence and stability

“…S7 and S8, ESI †). 22 The structural analyses of the nanocomposites were conrmed by FESEM, PXRD and TEM studies. FESEM images of the EAPbBr 3 @MOG composite (Fig.…”

“…All the stability-related experiments for the nanocomposites were executed maintaining similar conditions, in which bare NCs were readily prone to decompose. 22,53 To ensure open-air stability, both composites were kept in the open air for a few months (Fig. 2a, S31 and S32, ESI †) and retention of the original PL intensity (>80%) was found, demonstrating their long-term air stability.…”

“…Because of these shielding effects by the MOG matrix, the water molecules are unable to penetrate the MOG layer and cannot reach the perovskite NCs, leading to excellent stability in open air, water and under UV light. [22][23][24]54 Additionally, a variety of well-dened smooth and crack-free articial shapes and sculptures were successfully fabricated with these composites, without the addition of any external binder ( Fig. 3a and S42-S46, ESI †).…”

“…Encapsulation strategies have been considered as an efficient approach to enhance this optical property, as well as the chemical stability of perovskite NCs, and porous metal-organic frameworks (MOFs) are the latest addition, in this context. [22][23][24][25] However, the heterogeneous properties of MOFs are one of the key issues that restrict further utilization of perovskite-MOF nanocomposites in the form of thin lms or different workable structures. 26 In light of the growing interest in exible electronics, perovskite NCs embedded with so materials could offer high tolerance to structural deformation.…”

Recent Progress in Engineering Metal Halide Perovskites for Efficient Visible‐Light‐Driven Photocatalysis

“…Ghosh et al. reported a ZIF‐8‐stabilized MAPbBr 3 heterojunction (i.e., MAPbBr 3 @ZIF‐8) for the photodegradation of toxic organic dyes in water e, ZIF‐8 alone shows no activity towards the photodegradation of MO molecules.…”