Exfoliation of Dion-Jacobson Layered Perovskite into Macromolecular Nanoplatelet

Abstract

A layered perovskite of Dion-Jacobson phase, RbLaTa2O7, was successfully exfoliated into colloidal suspension via successive ion-exchange and intercalation reaction. The pristine perovskite RbLaTa2O7 was synthesized by conventional solid-state reaction, and then, it was ion-exchanged with hydrochloric acid to obtain a protonic form of perovskite. The resulting proton-exchanged perovskite was reacted with ethylamine to increase interlayer spaces for further intercalation reaction. Finally, the ethylamine-intercalated form was exfoliated into nanosheets via an intercalation of bulky organic cations (tetrabutylammonium). According to X-ray diffraction (XRD) analysis, the TBA-intercalated form showed remarkably increased interlayer spacing (Δd = 1.67 nm) in comparison with that of the pristine material. Transmission electron microscopic image of exfoliated perovskite clearly revealed that the present exfoliated perovskite were composed of very thin layers. This exfoliated perovskite nanosheets could be applicable as building blocks for fabricating functional nanocomposites.

Rapid Exfoliation and Surface Tailoring of Perovskite Nanosheets via Microwave‐Assisted Reactions

“…Microwave approaches are not new in the synthesis of other types of nanomaterials (various nanoparticles and nanostructures, graphene nanosheets), however, utilizing this method for the rapid exfoliation of perovskites and post‐exfoliation surface modification of the oxide nanosheets is novel to our knowledge. Interestingly, the average dimensions of the nanosheets obtained via MA reactions, are comparable to similar perovskite nanosheets attainable by conventional long duration bench‐top stirring methods . It should be noted that the average dimensions are usually observed via microscopy methods, as more quantitative methods such as dynamic light scattering (DLS) cannot be effective due to the wide range of lateral dimensions present after an exfoliation process.…”

“…Previous studies generally report the need for days or weeks of stirring to obtain similar exfoliated nanosheets, where only the supernatant of the suspension is collected after exfoliation, suggesting the low yield in traditional approaches . In contrast, the microwave‐assisted exfoliation methods presented here yield nanosheets in as little as 1 h. It is notable that all the characterization steps reported here were performed on the precipitates obtained after the centrifugation of as‐synthesized TBA‐functionalized nanosheets rather than the very small portion of the exfoliated NS that would be present in the supernatant.…”

“…more complicated assemblies of 2D structures for various applications. [46,48,49,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] In some cases, fluorination [71,74] or doping [50,72,75] of thesep erovskites has been carried out prior to exfoliation to improve the conductivity or catalytic activity of the nanosheets.Once 2D nanosheets are obtained, they can be used as buildingb locks for more complicated structures, allowing for improved electronic, optoelectronic, catalytic, or mechanical properties of composite structures.I ntegration of these components can occur via 2D heterostructures (lateral and vertical), [15,[32][33][34][76][77][78][79] layer-by-layer assemblies, [6,73,[80][81][82][83][84][85][86][87][88][89][90][9...…”

“…more complicated assemblies of 2D structures for various applications. [46,48,49,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] In some cases, fluorination [71,74] or doping [50,72,75] of thesep erovskites has been carried out prior to exfoliation to improve the conductivity or catalytic activity of the nanosheets.…”

Characteristics of SrCo1-xFexO3-δPerovskite Powders with Improved O2/CO2Production Performance for Oxyfuel Combustion

“…8 The mole ratio of EDTA: citric acid: total metal ions was 1:1.5:1. Then, the precursor solution was heated and stirred at 70 °C until it gelled.…”