Controllable Synthesis and Growth Mechanism of Two-dimensional TiSe2 Nanosheets

Abstract

Solution method is a mild, controllable and commonly used synthetic method. However, the reported solution methods for the preparation of TiSe 2 nanosheets usually use trioctylphosphine (TOP) as solvent. TOP is poisonous and potentially harmful to the human body as well as the environment. In this paper, hexagonal TiSe 2 nanosheets were synthesized by simple solution method without TOP. The shape evolution of TiSe 2 nanosheets was investigated by adjusting the reaction time. The crystal phase, morphology, elements, and the optical property of TiSe 2 nanosheets were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and UV-Vis spectroscopy, respectively. The spiral growth steps can be clearly observed in SEM images. A spiral layer by layer growth mechanism was proposed based on the morphology evolution of TiSe 2 nanosheets. The photocatalytic activity of TiSe 2 nanosheets was evaluated by the degradation of RhB under sun light irradiation. Compared with the commercial P25, the as-prepared TiSe 2 nanosheets exhibit a superior photocatalytic activity, which indicates that TiSe 2 nanosheets are promising candidate as photocatalytic material for environmental protection.

Ultrafast Response and High Selectivity toward Acetone Vapor Using Hierarchical Structured TiO2 Nanosheets

“…After centrifugal separation and being washed by cyclohexane and anhydrous ethanol, a dark brown precipitate was collected. The typical synthesis details are similar to our previous paper with certain modifications …”

“…The typical synthesis details are similar to our previous paper with certain modifications. 19 The TiSe 2 precursors were put in a quartz tube and heated up to 500 °C for various times under a mixed gas of argon and air with a flow rate of 100 sccm. Then, a white powder was obtained, and four samples with various annealing times of 1, 1.5, 2, and 3 h were prepared and labeled T1, T1.5, T2, and T3, respectively.…”