Method for preparing orthogonal-phase MoO3 monocrystal nanosheet through chemical vapor deposition

Abstract

The invention relates to a method for preparing an orthogonal-phase MoO3 monocrystal nanosheet through chemical vapor deposition, which comprises the following steps: cleaning a quartz substrate, sequentially performing ultrasonic cleaning in acetone, ethanol and deionized water, and blow-drying with nitrogen gas; placing 0.2-0.5g of MoS2 powder into a ceramic boat, and putting into a quartz tube of a tube furnace; putting the quartz substrate at the downwind opening of the ceramic boat filled with the raw material, sealing the tube furnace, and introducing argon to wash the tube furnace; and after cleaning, introducing argon and oxygen mixed gas, turning on a vacuum mechanical pump, starting a tube furnace heating program to raise the temperature, then naturally cooling to room temperature, and taking out a sample, wherein a white product is grown on the quartz substrate and is the monocrystal MoO3 nanosheet. The invention overcomes the respective defects in wet chemical stripping, a microwave method and a hydrothermal method. According to the invention, preparation technology of alpha-MoO3 nanocrystal is expanded; the synthesis process is simple and easy to control; the used raw materials and equipment are simplex and cheap; the preparation flow is safe, non-toxic, quick and efficient; and the obtained sample is high in yield.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to the preparation of orthorhombic MoO by chemical vapor deposition 3 Single Crystal Nanosheet Method. Background technique [0002] MoO 3 There are three common crystal phase structures: thermodynamically stable orthorhombic phase (α-MoO 3 ) and thermodynamically metastable monoclinic phase (β-MoO 3 ) and hexagonal phase (h-MoO 3 ). where α-MoO 3 Belonging to wide bandgap semiconductors (E g =3.05eV), which is caused by the distorted [MoO 6 ] The octahedrons are connected by common edges in one direction, and connected by common vertices in the other direction, forming a two-dimensional infinitely stretched plane layer, and the layers are combined by weak van der Waals force. Two-dimensional Quantum Strong Confinement α-MoO 3 The nanosheet structure has remarkable photoluminescence, field emission, reversible photochromism, photochromism, electrochromism, gas sensing...

AI Technical Summary

Problems solved by technology

However, the MoO obtained by the liquid phase method 3 The morphology and size of nanostructures are not uniform enough, and the existence of various chemical groups in the growth environment makes the extrinsic defect states, surface states and other microstructural features of the sample complex, which cannot form perfect crystallinity and single crystal characteristics, affecting α-MoO 3 Intrinsic physical properties of nanocrystals, and there are problems in the liquid phase process, such as safety and acidification operation are not easy to control

[0007] Direct Preparation of α-MoO on Silicon Substrates by Pulsed Electron Beam Deposition and Pulsed Laser Deposition 3 Nanorod arrays, however, they require expensive deposition equipment, high vacuum requirements, strict control of preparation process conditions, high energy consumption, and low yield, which restricts the application of industrial mass production

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