Sodium-Poor, Hydroxyl-Rich, Defective NaTiO Prepared by γ-Irradiation and Its Enhanced Proton Conductivity.

The use of γ-irradiation to tailor the physicochemical properties of materials is not widely applied to layered alkali metal oxides. Herein, we show that γ-irradiation (up to 400 kGy) of NaTiO leads to a sodium-poor, hydroxyl-rich analogue where the layered structure, plate-like morphology, and textural properties are preserved. The deintercalation of sodium ions modifies the Ti-O bond lengths and expands the unit cell; the latter is supported by density functional theory (DFT) calculations.

Alternating current properties of bulk- and nanosheet-graphitic carbon nitride compacts at elevated temperatures.

The investigations of temperature-dependent electrical properties in graphitic carbon nitride (g-CN) have been largely performed at/below room temperature on devices commonly fabricated by vacuum techniques, leaving the gap to further explore its behaviors at high-temperature. We reported herein the temperature dependence (400 → 35 °C) of alternating current (AC) electrical properties in bulk- and nanosheet-g-CN compacts simply prepared by pelletizing the powder. The bulk sample was synthesized the direct heating of urea, and the subsequent HNO-assisted thermal exfoliation yielded the nanosheet counterpart.

Electrochemical and electrical characteristics of ball milled CsTiO modified by the surface-to-bulk migration of hydroxyl groups.

Ball milling of solids under benign conditions leads to surface functionalization without altering the crystal structure and morphology. However, these additional surface functional groups are rarely fixed but instead mobilized across such ball milled solids. This phenomenon, including its effects on electrochemical and electrical properties, has received limited attention.

TiO/graphitic carbon nitride nanosheet composite with enhanced sensitivity to atmospheric water.

Understanding the fundamentals of transport properties in two-dimensional (2D) materials is essential for their applications in devices, sensors, and so on. Herein, we report the impedance spectroscopic study of carbon nitride nanosheets (CNNS) and the composite with anatase (TiO/CNNS, 20 atom% Ti), including their interaction with atmospheric water. The samples were characterized by X-ray diffraction, N adsorption/desorption, solid state H nuclear magnetic resonance spectroscopy, thermogravimetric analysis, and transmission electron microscopy.

AC Conductivity and Dielectric Properties of Lepidocrocite-type Alkali Titanate Tunable by Interlayer Cation and Intralayer Metal.

The lepidocrocite-type layered alkali titanate TiO has diverse chemical compositions with variation in charge per formula unit , the interlayer cation , and the intralayer metal . Despite this multivariable nature, the composition dependence of physical properties is not well explored. We report herein the AC conductivity and the complementary dielectric properties of CsTiO, KTiO ( = Zn, Ni), and the mixed-interlayer ion CsKZnTiO.