▎ 摘　　要

NOVELTY - The cmethod comprises coating sodium molybdate solution on substrate A. The sodium molybdate coating surface of the substrate A and polishing surface of substrate B are overlapped so as to form a micron-sized slit between them. Tellurium powder container and the laminated substrate are put into a tubular furnace quartz tube. The tellurium powder in the quartz tube is heated to sublimate to form tellurium steam. Molybdenum source is reacted with the tellurium steam. After heat preservation stage is finished, the quartz tube is quickly cooled. After the quartz tube is reduced to room temperature, the laminated substrate is taken out to obtain the two dimensional molybdenum ditelluride (MoTe2) on the surface of the upper substrate. USE - Method for preparing two-dimensional molybdenum ditelluride (MoTe2) nanomaterial by confined-space chemical vapour deposition. ADVANTAGE - The method is capable of providing uniform and ultra-high effective concentration. The obtained thin layer MoTe2 has high quality, jumbo size, uniform thickness, large area, stable and controllable advantages. DETAILED DESCRIPTION - The method comprises: (i) preparing two substrates, marking as substrate A and substrate B, carrying out plasma surface treatment to the polishing surface of the substrate A; (ii) coating sodium molybdate solution on the surface of the substrate A, forming sodium molybdate coating substrate; (iii) overlapping the sodium molybdate coating surface of the substrate A and the polishing surface of the substrate B in a face-to-face manner so as to form a micron-sized slit between them; where the substrate B is placed above as the upper substrate, and the sodium molybdate coating substrate A is used as the lower substrate; both of them form a laminated substrate; (iv) uniformly loading the tellurium powder in the container, and then putting the tellurium powder container and the laminated substrate into a tubular furnace quartz tube, when the tubular furnace heating device is heated, the temperature of the quartz tube section of the tellurium powder container is lower than the temperature of the constant temperature region of the tubular furnace, and the quartz tube section where the laminated substrate is located is not heated; then sealing the quartz tube, then introducing inert gas of predetermined flow to completely replace the air in the quartz tube; (v) raising the temperature of the tubular furnace to the target temperature and keeping the temperature for a period of time; heating the tellurium powder in the quartz tube to sublimate to form tellurium steam; in the heating process, the inert gas is filled in the quartz tube; the mixed gas of the hydrogen and the inert gas is filled in the heat preservation process; (vi) keeping the target temperature of the tubular furnace; moving the laminated substrate in the quartz tube position to make the laminated substrate in the tubular furnace constant temperature area; fast heating the molybdenum source and reacting the molybdenum source with tellurium steam; introducing mixed gas of hydrogen and inert gas into the furnace body heat preservation process; (vii) after the heat preservation stage is finished, closing the hydrogen gas flow, increasing the inert gas flow to blow, then fast cooling the quartz tube, reducing the inert gas flow in the cooling process; and (viii) after the quartz tube is reduced to room temperature, taking out the laminated substrate; obtaining the two dimensional MoTe2 on the surface of the upper substrate.