Controllable Synthesis and Growth Mechanism of Two-dimensional TiSe2 Nanosheets

doi:10.15541/jim20180565

Abstract

Abstract:

Solution method is a mild, controllable and commonly used synthetic method. However, the reported solution methods for the preparation of TiSe₂ 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 TiSe₂ nanosheets were synthesized by simple solution method without TOP. The shape evolution of TiSe₂ nanosheets was investigated by adjusting the reaction time. The crystal phase, morphology, elements, and the optical property of TiSe₂ 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 TiSe₂ nanosheets. The photocatalytic activity of TiSe₂ nanosheets was evaluated by the degradation of RhB under sun light irradiation. Compared with the commercial P25, the as-prepared TiSe₂ nanosheets exhibit a superior photocatalytic activity, which indicates that TiSe₂ nanosheets are promising candidate as photocatalytic material for environmental protection.

Key words: TiSe₂ nanosheets, microstructure, growth mechanism, photocatalytic property

CLC Number:

TQ174

JIAO Si-Yi, GE Wan-Yin, YIN Li-Xiong, XU Mei-Mei, CHANG Zhe, ZHANG Li. Controllable Synthesis and Growth Mechanism of Two-dimensional TiSe₂ Nanosheets[J]. Journal of Inorganic Materials, 2019, 34(8): 834-838.

Figures/Tables 4

Fig. 1 XRD patterns of TiSe2 nanosheets grown at different reaction time

Fig. 2 Photograph of TiSe2 powder (a); SEM images of TiSe2-10 min (b), TiSe2-50 min (c), TiSe2-90 min (d) and EDS mapping of TiSe2-90 min (e-g)

Fig. 3 Formation schematic illustration of TiSe2 nanosheets

Fig. 4 (a) Absorption spectra of RhB after exposure in the presence of TiSe2-10 min nanosheets at different illumination time, (b) variation of concentration of RhB solution at different illumination time, (c) degradation kinetic curves and (d) changes in color of RhB solution after photocatalytic degradation

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Controllable Synthesis and Growth Mechanism of Two-dimensional TiSe₂ Nanosheets

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