Two-dimensional transition metal sulfide and preparation method thereof

Abstract

The invention relates to a two-dimensional transition metal sulfide and a preparation method thereof. According to the technical scheme, aluminum foil and target metal foil with the same size or aluminum foil and each of the two kinds of metal foil with the same size are soaked in absolute ethyl alcohol, and are ultrasonically cleaned, dried, aligned and stacked, and the metal foil stacked neatlyis obtained; the roll gap of a two-high rolling mill is adjusted to be 0.1 mm, the metal foil stacked neatly is folded and rolled repeatedly 15-50 times, the folded and rolled metal foil is soaked inan etchant for 12-48 hours, filtering is performed, ultrasonic treatment in an ethanol solution is performed, a suspension is taken, centrifuged twice and filtered twice, drying is performed, and thetarget two-dimensional transition metal foil is obtained; finally, a porcelain boat with the target two-dimensional transition metal foil laid at the bottom is placed in the downwind direction of a constant temperature area of a vacuum tube furnace, and a porcelain boat with sublimed sulfur laid at the bottom is placed in the upwind direction of the constant temperature area of the vacuum tube furnace; two-dimensional transition metal sulfide is obtained under the condition of circulating argon and temperature kept at 300-800 DEG C for 3-12 h. The two-dimensional transition metal sulfide and the preparation method thereof have the advantages of high production efficiency, simple process and controllable product thickness.

Description

technical field [0001] The invention belongs to the technical field of transition metal sulfides. Specifically, it relates to a two-dimensional transition metal sulfide and a preparation method thereof. Background technique [0002] Transition metal dichalcogenides have excellent semiconducting properties. When changing from bulk to single-layer nanosheets, the band gap changes significantly, from indirect to direct band gap, resulting in many similar or even superior properties of 2D transition metal dichalcogenides. Due to the characteristics of graphene, it has potential applications in optoelectronics. In addition, transition metal sulfide nanocatalysts have high catalytic performance as cathodes in catalyzing the hydrogen reduction reaction for hydrogen production from water electrolysis. Due to the large specific surface area of ​​two-dimensional materials, the proportion of active atoms to the total number of atoms is greatly increased, which can not only improve th...

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Problems solved by technology

Coleman et al. (Coleman JN, Lotya M, O'Neill A, et al. Two-dimensional nanosheets produced by liquid exfoliation of layered materials. [J]. Science (New York, N.Y.), 2011, 331(6017):568. ) using the liquid-phase exfoliation method, mixing transition metal sulfide powder and solvent to prepare two-dimensional metal sulfides through ultrasonic exfoliation. Although this method is simple in process, the thickness of the product is uneven; the electrochemical intercalation exfoliation method (Zeng Z, Sun T, Zhu J, et al. An effective method for the fabrication of few-layer-thick inorganic nanosheets[J]. AngewandteChemie, 2012, 124(36):9186-9190.), making lithium ions into transition metals with the help of electrochemical workstation The interlayer of sulfide can be stripped. Although this method can achieve rapid stripping, the discharge time needs to be strictly controlled, and the yield is low. Transition metal sulfide nanosheets are obtained on the chip. This method requires high control of reaction conditions, and the process is not yet mature, so it is not suitable for large-scale production.

[0004] Liu et al. (Liu H, Tang H, Fang M, et al. 2D Metals by Repeated SizeReduction.[J]. Advanced Materials, 2016, 28(37):8170-8176.) disclosed the method of preparing two-dimensional metal sheets by repeated calendering. method, but only stopped at pure two-dimensional metal foils, and did not extend the method to prepare two-dimensional sulfides