Polymorphic Phases of Metal Chlorides in the Confined 2D Space of Bilayer Graphene (Adv. Mater. 52/2021)

Abstract

Dimensional Confinement In article number 2105898, Yung‐Chang Lin, Kazu Suenaga, and co‐workers report the discovery of a new AlCl3 structure in 2D form. Metal chlorides such as AlCl3 and CuCl2 intercalated in bilayer graphene are found to have polymorphic phases, which have not been previously expected in bulk. Utilizing dimensional confinement, the growth of further unexpected 2D materials in the nanospace between bilayer graphene is expected.

Molybdenum Chloride Nanostructures with Giant Lattice Distortions Intercalated into Bilayer Graphene

“…The intercalated MoCl x consists of mainly crystalline MoCl 3 regions (about 5 nm in diameter) with different crystal orientations. One can see that the intercalated MoCl x structure is relatively loose as compared to other metal chlorides in BLG, 25 having voids among the crystalline regions of MoCl 3 . A possible assumption is that when materials are spatially confined within the interlayers of BLG, they have the potential to adopt structures distinct from those of the original material.…”

“…Here, we discuss the detailed structure of the MoCl 2 chain and its dynamics under the electron beam. Unlike the reported BLG-intercalated CuCl 2 , which is composed of 2D crystals with neatly arranged chains, 25 the MoCl 2 chains are always separated from each other. A low-magnification (dose = 7.0 × 10 3 e − /Å 2 ) ADF image in Figure 4a and the accompanying enlarged images from the blue dashed boxed area of the image displayed in Figure 4b (dose = 4.9 × 10 4 e − / Å 2 ) and 4c (dose = 4.9 × 10 4 e − /Å 2 ) show the MoCl 2 chains in the interacted MoCl x .…”

“…21,23 Recently, several research teams have used low-voltage (scanning) transmission electron microscopy ((S)TEM) to directly study the atomic arrangement of alkali metals and metal chlorides intercalated in bilayer graphene (BLG) and have uncovered many previously unexpected structures. Specifically, closely packed Li structures stacked in more than one atomic layer, 14 2D cuprous iodine, 24 unforeseen polymorphic phases of AlCl 3 , 25 and lateral superlattice AlCl 3 / CuCl 2 alloy 25 have been reported. These results suggested that BLG is a robust platform for visualizing intercalation materials and that the 2D nanospace inside BLG can even be used to grow unusual low-dimensional structures.…”

Screening 0D Materials for 2D Nanoelectronics Applications

“…Also, AlCl 3 and CuCl 2 clusters and various dimerized and trimerized forms of them have successfully been intercalated between graphene sheets. [ 43 ] Although materials consisting of more than one type of clusters were ignored in this paper for reasons of simplicity, a vast variety of such 0D molecular compounds could exist. As an example, 2D crystal made of SbI 3 and S 8 molecular units was reported in ref.…”

Bioresource Upgrade for Sustainable Energy, Environment, and Biomedicine

“…Owing to their high lignin solubility, wide potential to avoid water splitting reaction, the ionic liquids (ILs) have attracted attention as alternative electrolytes. While the high-cost of ILs has limited their commercial use, hydrothermal carbonization (HTC) and hydrothermal liquefaction (HTL) can be used as alternatives to conventional fuels due to the synthesis of high-value-added carbonaceous materials and biofuels [ 7 , 8 ]. The hydrothermal conversion of food residues and lignocellulosic biomass has been studied via HTC and HTL [ 9 , 10 ].…”