Few-layered titanate nanosheets with large lateral size and surface functionalization: potential for the controlled exfoliation of inorganic–organic layered composites

Nakada, Gentoku; Imai, Hiroaki; Oaki, Yuya

doi:10.1039/c7cc07759a

Cited by 23 publications

(24 citation statements)

References 57 publications

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“…[24][25][26][27][28][29][30][31][32][33][34][35][36] Efficient exfoliation methods of graphite and transition-metal dichalcogenides were extensively studied in previous studies (open black plots in Figure 2), [24][25][26][27][28][29][30][31][32][33][34][35] while the exfoliation yield of a transition-metal oxide is low, approximately 5 % for 10 days and 14 % for 5 days (filled red plots 13 and 14 in Figure 2). [36,37] New strategies to improve the exfoliation yield are of significance for This article is protected by copyright. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

“…Our group has developed another new approach for exfoliation of layered composites into the surfacefunctionalized nanosheets, such as monolayers and few-layers, in organic media (Figure 1). [37][38][39][40] The precursor layered composites are prepared by intercalation of the organic guests. The layered composites are exfoliated into nanosheets in dispersion media.…”

Section: Introductionmentioning

confidence: 99%

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Materials‐Informatics‐Assisted High‐Yield Synthesis of 2D Nanomaterials through Exfoliation

Nakada

Igarashi

Imai

et al. 2019

Advcd Theory and Sims

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A variety of inorganic and organic nanosheets with characteristic structures and properties can be synthesized through exfoliation of layered materials. However, in general, immense time and efforts are required for exploration of exfoliation conditions and characterization of nanosheets. In addition, it is challenging to improve the yield of nanosheets obtained through exfoliation. Here we propose a materials-informatics-assisted high-yield synthesis of nanosheets, which does not require experience and intuition. Layered composites containing inorganic layers and interlayer organic guests are delaminated into nanosheets in a variety of dispersion media. First, an experimental screening is performed to find efficient exfoliation conditions and obtaina training dataset for the informatics approach. Sparse modeling is then used facilitating the extraction of important factors predicting the yield of nanosheets. High-yield (up to approximately 50 %) syntheses of nanosheetsare demonstrated in unknown systems in a minimum number of experiments. The yield is higher than those typically reported for layered materials. We expect that the effective combination has potentials for not only discovery of compounds but also structure control of materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Materials‐Informatics‐Assisted High‐Yield Synthesis of 2D Nanomaterials through Exfoliation

Nakada

Igarashi

Imai

et al. 2019

Advcd Theory and Sims

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“…29,30 Titanate nanosheets with different sizes were formed from different guestmedium combinations. 34,35 In the present work, the layered composites of manganese oxide and C 14 -NH 2 (C 14 -MnO 2 ) were exfoliated into nanosheets in toluene. The layered C 14 -MnO 2 was prepared by the method in our previous report.…”

Section: Changes In the Lateral Size Thickness And Yieldmentioning

confidence: 99%

“…This exfoliation method has potential for synthesis of nanosheets with controlled yield, size, and surface chemistry. [29][30][31][32][33][34][35][36][37] The exfoliation behavior can be changed with different combinations of interlayer guests and dispersion media. However, the exfoliation processes and stability of the resultant nanosheets have not been fully studied in previous work.…”

Section: Introductionmentioning

confidence: 99%

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Formation processes, size changes, and properties of nanosheets derived from exfoliation of soft layered inorganic–organic composites

2020

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Nanosheet‐Based Uneven Thin Film Exhibiting Angle‐Independent Structural Color and Its Application to Detection of Biogenic Amines

Haraguchi

Imai

Oaki

2022

Adv Materials Inter

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processes in the liquid phase. In general, monolayer nanosheets are extracted only from exfoliated materials through purification. The unique properties of monolayers have been extensively studied in previous works. [1,2,4,6,[8][9][10] In contrast, other exfoliated nanosheets thicker than monolayers, such as few-layers or multiple-layers, were not widely used for applications, such as sensors and catalysts. At the same time, such materials also have potential applications. [16][17][18][19][20] Therefore, the size, surface chemistry, and assembly state of nanosheets, including monolayers and few-layers, are important for device fabrication. Our group has previously studied the exfoliation of layered transition metal oxides in organic dispersion media through the formation of layered composites with the intercalation of organic guests. [21,22] Surface-modified nanosheets were obtained by exfoliation in an organic medium. The prediction models for the yield, size, and size distribution were constructed through the extraction of the descriptors by a combination of machine learning and chemical insight on small experimental data. [23][24][25][26][27][28] These predictors contributed to the efficient exploration of appropriate experimental conditions, such as host-guest-medium combinations that yield the monodispersed and polydispersed nanosheets. [26] In the present work, surface-modified nanosheets with polydispersed lateral sizes and thicknesses were used to prepare an uneven thin film exhibiting an angle-independent structural color (Figure 1). The corresponding host-guest-medium combinations were selected based on the prediction model.Exfoliated nanosheets have been used as building blocks for the production of composites, [29][30][31][32][33][34][35] such as layer-by-layer assemblies, gels, and organic-inorganic composites. However, nanosheets are not easy to organize into the aligned states, such as thin films and liquid crystals. Specific methods and optimized conditions are required to align the nanosheets because the evaporation of the dispersion media causes random aggregation. Thin films and liquid-crystalline assemblies exhibiting structural colors have been previously prepared by homogeneous stacking of monolayered nanosheets. [35][36][37][38][39][40][41] Structural colors have been applied in the detection of chemical vapors and mechanical stresses. [37][38][39]41] However, self-assembled thin films with homogeneous thickness exhibit angle-dependent structural colors. In previous works, the angle-independent structural color was

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Few-layered titanate nanosheets with large lateral size and surface functionalization: potential for the controlled exfoliation of inorganic–organic layered composites

Cited by 23 publications

References 57 publications

Materials‐Informatics‐Assisted High‐Yield Synthesis of 2D Nanomaterials through Exfoliation

Materials‐Informatics‐Assisted High‐Yield Synthesis of 2D Nanomaterials through Exfoliation

Formation processes, size changes, and properties of nanosheets derived from exfoliation of soft layered inorganic–organic composites

Nanosheet‐Based Uneven Thin Film Exhibiting Angle‐Independent Structural Color and Its Application to Detection of Biogenic Amines

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