Method for preparing single-layer two-dimensional transition metal sulfide material
A transition metal and sulfide technology, applied in the field of preparing single-layer two-dimensional transition metal sulfide materials, can solve problems such as pollution, sample contamination, and excessive crystal nuclei
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[0025] Example 1
[0026] Use as figure 1 CVD growth equipment, parts 1, 2, 3 and 4 in the figure, regions 1 and 2 are the low temperature and high temperature regions of CVD respectively, 1 is S powder or Se powder, 2 is metal foil, 3 is sapphire substrate , 4 is Ar and H 2 The mixed gas.
[0027] A kind of preparation of monolayer MoS 2 Methods. It includes the following steps:
[0028] (1) First, put the Mo metal foil in a mixed solution of concentrated sulfuric acid and hydrogen peroxide (H 2 SO 4 : H 2 O 2 Volume ratio=2:1) Soak for 2 hours, then place the Mo metal foil at 2 places in the high temperature zone 2 of the 2-inch quartz tube, and heat up to 400°C at a rate of 40°C / min. Annealing at atmospheric pressure in the air for 2 minutes to fully oxidize to Mo oxide MoO 3-X ;
[0029] (2) Put the cut 10*40mm single-polished quartz chip in a mixed solution of concentrated sulfuric acid and hydrogen peroxide (H 2 SO 4 : H 2 O 2 Volume ratio = 2:1) Soak for 2 hours, and then u...
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[0033] Example 2
[0034] Use as figure 1 CVD growth equipment, components 1, 2, 3 and 4 in the figure, regions 1 and 2 are the low and high temperature regions of CVD respectively, 1 is Se powder, 2 is metal foil, 3 is sapphire substrate, 4 is Ar and H 2 The mixed gas.
[0035] A preparation of single-layer WSe 2 Methods. Using the oxidized W foil as the W precursor and Se powder as the Se source, a triangular shape WSe with a side length of about 4.5 microns is prepared 2 . Use optical microscope and Raman equipment to characterize the prepared samples, the results are as follows image 3 Shown. The sample presents a very good triangular shape and is a single-layer WSe with good uniformity 2 material. Specific steps are as follows:
[0036] (1). First, put the W metal foil in a mixed solution of concentrated sulfuric acid and hydrogen peroxide (H 2 SO 4 : H 2 O 2 Volume ratio = 2:1) Soak for 2 hours, then place the W metal foil at 2 places in the high temperature zone 2 of the...
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