Physical–Chemical Exfoliation of n-Alkylamine Derivatives of Layered Perovskite-like Oxide H2K0.5Bi2.5Ti4O13 into Nanosheets

Abstract

In the present work, we report the results on exfoliation and coating formation of inorganic–organic hybrids based on the layered perovskite-like bismuth titanate H2K0.5Bi2.5Ti4O13·H2O that could be prepared by a simple ion exchange reaction from a Ruddlesden–Popper phase K2.5Bi2.5Ti4O13. The inorganic–organic hybrids were synthesized by intercalation reactions. Exfoliation into nanosheets was performed for the starting hydrated protonated titanate and for the derivatives intercalated by n-alkylamines to study the influence of preliminary intercalation on exfoliation efficiency. The selected precursors were exfoliated in aqueous solutions of tetrabutylammonium hydroxide using facile stirring and ultrasonication. The suspensions of nanosheets obtained were characterized using UV–vis spectrophotometry, dynamic light scattering, inductively coupled plasma spectroscopy, and gravimetry. Nanosheets were coated on preliminarily polyethyleneimine-covered Si substrates using a self-assembly procedure and studied using atomic force and scanning electron microscopy.

Highly Efficient Liquid-Phase Exfoliation of Layered Perovskite-like Titanates HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd) into Nanosheets

“…To investigate the morphology of separate nanosheets without preliminary flocculation, they were deposited on silicon substrates via the self-assembly method adopted from the publication [59]. First of all, the substrates were treated with concentrated hydrochloric acid and methanol mixed at a volume ratio of 1:1 at 60 • C for 30 min, rinsed with distilled water and acetone and dried.…”

“…The superior physical-chemical properties of these compounds originate from the unique perovskite structure of the slabs and the propensity of their interlayer space for various reactions, such of ion exchange and intercalation [16][17][18][19]. Layered perovskites are well established as efficient catalysts [20,21], photocatalysts [22][23][24][25][26][27][28][29], ionic conductors [30][31][32][33][34][35][36][37][38] and luminescent materials [39][40][41][42][43][44], as well as precursors for the creation of composite [45][46][47][48][49][50][51][52] and hybrid inorganic-organic materials [53][54][55][56][57][58][59][60].…”

Indium doping-assisted monolayer Ga2O3 exfoliation for performance-enhanced MOSFETs

“…Inspired by the ligand-assisted exfoliation and intercalation-assisted exfoliation of perovskite nanosheets, [29][30][31] this study proposes a more efficient solution to acquire ML Ga 2 O 3 by exfoliation from indium (In)-doped bulk β-Ga 2 O 3 . At the IIIA group, the In atom shares similar outer electron arrangement with Ga atom and possesses larger atomic radius, which can be substitutionally doped in β-Ga 2 O 3 and has been well investigated at theoretical and experimental aspects in previous studies.…”

Design of Micro- and Nanoparticles: Self-Assembly and Application

“…The production of nanolayers using top-down approaches, such as the layering of bulk layered oxides, is one of the most promising directions in the field of 2D nanomaterials. Using the top-down approach, Silyukov and co-workers [ 23 ] showed the formation of stable suspensions of perovskite nanolayers and their coatings. They were obtained by exfoliation of the protonated bismuth titanate and its N -alkylamine derivatives in an aqueous solution of tetrabutylammonium hydroxide.…”