Liquid exfoliation of five-coordinate layered titanate K₂Ti₂O₅ single crystals in water

Abstract

Liquid exfoliation is a scalable and effective technique for preparing two-dimensional materials but faces several challenges including low yields and lack of control over the lateral size of the nanosheets....

High Li-Ion Selectivity of Five-Coordinate Layered Titanate K2Ti2O5

“…The KTO-900 sample shows the typical pre-edge peak at 4970.5 eV, which is characteristic of (OTi)­O 4 square pyramid symmetry. The comparison of the KTO-900 and KTO-900 hydrated samples shows that the position of the pre-edge peak of KTO-900 hydrated shifted to higher energies (by ∼0.5 eV) owing to hydration, and the intensity of the KTO-900 hydrated absorption peak decreased by ∼20%, indicating that partial hydrolysis occurred to form surface hydroxyl groups . The observed peak shift and decrease in peak intensity may be attributed to the local structural transformation of pyramidal TiO 5 to octahedral TiO 6 . ,, Notably, the KTO-900 hydrated sample exhibited a weak shoulder peak at approximately 4974.5 eV.…”

“…20 The observed peak shift and decrease in peak intensity may be attributed to the local structural transformation of pyramidal TiO 5 to octahedral TiO 6 . 20,29,30 Notably, the KTO-900 hydrated sample exhibited a weak shoulder peak at approximately 4974.5 eV.…”

“…All reagents were purchased from FUJIFILM Wako Pure Chemical Industries unless specified otherwise. KTO single crystals were prepared according to literature 20 using the flux-evaporation-assisted method. A stoichiometric mixture of K 2 CO 3 (99.5%) and TiO 2 (anatase, 98.0%) was used as the solute, while KCl (>95.0%) and KOH (>85.0%) were used as fluxes.…”