The invention discloses a preparation method for a large-area single-layer or few-layer
molybdenum disulfide film. The main steps of the preparation method are as follows: firstly,
sulfur powder and
molybdenum trioxide powder are placed in two
quartz boats respectively, a substrate is placed on the
quartz boat loaded with
molybdenum trioxide powder, and the obverse surface faces downwards; secondly, the two
quartz boats loaded with
sulfur powder and
molybdenum trioxide powder are placed at a bottom end and an orifice of a quartz
test tube respectively; thirdly, the above quartz
test tube is placed in a tubular furnace, the bottom end and the orifice of the
test tube are located at the edge area and the central area of the tubular furnace respectively; fourthly, protection gas
argon or
nitrogen is inputted into the tubular furnace, a normal pressure is kept until the experiment is over; fifthly, the tubular furnace is heated at a certain heating speed, thus the edge area and the central area of the tubular furnace are in proper temperatures respectively, the temperatures are kept for some time,
sulfur powder sublimates and reacts with
gas phase molybdenum trioxide, and a large-area single-layer or few-layer
molybdenum disulfide film is generated on the substrate; sixthly, the tubular furnace is cooled to the
room temperature, and the preparation process is finished. The method is slightly affected by air flow, the repetition rate is high, preparation of high-quality large-area single-layer or few-layer
molybdenum disulfide film can be achieved at a normal pressure.