Atomically thin, large area aluminosilicate nanosheets fabricated from layered clay minerals

Bae, Hyun Jeong; Goh, Yumin; Yim, Haena; Yoo, So Yeon; Choi, Ji‐Won; Kwon, Do-Kyun

doi:10.1016/j.matchemphys.2018.09.040

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…Bentonite clay is a hydrophilic clay-mineral because it presents a three-phase crystalline structure that results in its intrinsic characteristic, the form disposed in stacked layers of silicate, therefore negative charges on the clay-mineral surface are caused by the presence of oxygen and hydroxyls at its vertices, so, it can establish bonds with the also hydrophilic medium through intermolecular hydrogen bonds, since its stacked silicate layers are stabilized by Van der Waals forces by the presence of inorganic cations. In this condition, the clay is dispersed in the medium in an aggregate and intercalated form, thus, not uniformly performing its barrier property [1,2,29].…”

Section: Introductionmentioning

confidence: 99%

Influence of the ionic and nonionic surfactants mixture in the structure and properties of the modified bentonite clay

Monteiro

Silva

Santos

et al. 2018

Journal of Molecular Liquids

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Section: Introductionmentioning

confidence: 99%

Influence of the ionic and nonionic surfactants mixture in the structure and properties of the modified bentonite clay

Monteiro

Silva

Santos

et al. 2018

Journal of Molecular Liquids

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“…Particularly, mica nanosheets are found to show reduced bandgap corresponding to semiconductor regime. Bae et al reported a measured optical bandgap of 4.13 eV 13 , which was considerably smaller than that of bulk mica (about 7.85 eV) 16 . Exfoliated mica has a downward bandgap of 4.40 eV, 3.91 eV, and 3.62 eV with the enhanced degree of exfoliation, though the layer numbers were not identified 9 .…”

Section: Introductionmentioning

confidence: 94%

“…High-quality mica nanosheets were exfoliated from natural ground mica after a combination of CTAB intercalation and ultrasonication treatment 12 . Amphipathic poly(vinylpyrrolidone) (PVP) polymer can prevent self-aggregation of exfoliated nanosheets through the repulsive forces stemming from hydrophobic polyvinyl chains that stretch towards solvents, further overcome the difficulties in exfoliations of large area nanosheets from bulk mica without the application of ultrasonication process 13 . (4) Microwave-expanded exfoliation technique.…”

Section: Introductionmentioning

confidence: 99%

Origin of observed narrow bandgap of mica nanosheets

Lee

2022

Sci Rep

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Mica nanosheets possess peculiar feature of narrowed bandgap with the decrease of thickness but a conclusive theoretical understanding of the narrowing mechanisms is still under development. In this report, first-principles calculations were carried out to investigate the electronic band structure of mica nanosheets with the deposition of K2CO3. Bulk mica shows an indirect bandgap of 4.90 eV. Mica nanosheets show similar electronic structures to bulk mica with a gradually increased bandgap of 4.44 eV, 4.52 eV and 4.67 eV for 1-layer, 2-layers and 3-layers nanosheets, respectively, which is attributed to the lattice relaxation. K2CO3 is found to have strong affinity towards mica nanosheets. The K2CO3 deposited mica nanosheets showed an increased bandgap with the increase of thickness, consistent with experimental observations. The calculated bandgap of K2CO3 deposited mica for 2-layers and 3-layers nanosheets are 2.60 eV and 2.75 eV, respectively, which are comparable with the corresponding experimental values of 2.5 eV and 3.0 eV. Our theoretical findings support the experimental evidence of surface contamination of mica by K2CO3, and provide new insight into the structure and properties of 2D mica.

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“…51,[57][58][59] Moreover, LPE can be combined with ion exchange, intercalation steps, or chemical modifications to aid the delamination of materials with stronger interlayer interactions, such as micas. [60][61][62] These additional steps can help achieving higher yield and thinner flakes. However, it is important to note that LPE typically results in a suspension of flakes with varying sizes and small lateral dimensions.…”

Section: B Liquid Phase Exfoliationmentioning

confidence: 99%

Phyllosilicates as earth-abundant layered materials for electronics and optoelectronics: Prospects and challenges in their ultrathin limit

Barcelos,

de Oliveira,

Schleder

et al. 2023

Journal of Applied Physics

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Phyllosilicate minerals are an emerging class of naturally occurring layered insulators with large bandgap energy that have gained attention from the scientific community. This class of lamellar materials has been recently explored at the ultrathin two-dimensional level due to their specific mechanical, electrical, magnetic, and optoelectronic properties, which are crucial for engineering novel devices (including heterostructures). Due to these properties, phyllosilicate minerals can be considered promising low-cost nanomaterials for future applications. In this Perspective article, we will present relevant features of these materials for their use in potential 2D-based electronic and optoelectronic applications, also discussing some of the major challenges in working with them.

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Atomically thin, large area aluminosilicate nanosheets fabricated from layered clay minerals

Cited by 9 publications

References 29 publications

Influence of the ionic and nonionic surfactants mixture in the structure and properties of the modified bentonite clay

Influence of the ionic and nonionic surfactants mixture in the structure and properties of the modified bentonite clay

Origin of observed narrow bandgap of mica nanosheets

Phyllosilicates as earth-abundant layered materials for electronics and optoelectronics: Prospects and challenges in their ultrathin limit

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