| Summary: | 碩士 === 國立中正大學 === 光機電整合工程研究所 === 107 === At this stage, two-dimensional ferromagnetic materials are very popular. Among them, the most discovered and popular material is chromium triiodide. Chromium triiodide has obvious ferromagnetism at low temperature and single layer, but because chromium triiodide is very instability of a little light and some moisture will begin to hydrolyze. So the study of chromium triiodide requires very good protection to ensure that it will not hydrolyze. But the protection measures are very complicated and difficult and require some more exact operations. At the same time, another magnetic two-dimensional material, vanadium diselenide, was found, which is relatively stable in chemical properties.
In addition to being chemically stable, vanadium diselenide is ferromagnetically measured at room temperature compared to chromium triiodide at an absolute temperature of 61 K. This characteristic also reflects the study of vanadium diselenide. The importance of it. At this stage to grow a single layer of vanadium diselenide needs to use molecular beam epitaxy (MBE) to grow because vanadium diselenide is a material that tends to grow vertically if use another way to grow vanadium diselenide than the thickness will be much thicker.
Compared with the high cost and rareness of molecular beam epitaxy, chemical vapor deposition (CVD) is relatively common and convenient to grow. But due to the current chemical vapor deposition, it has not been able to grow a single layer. So the purpose of this experiment is to use chemical vapor deposition to grow a single layer of vanadium diselenide, and it has been found that different substrate like transition metal dichalcogenides has magnetism increased and a single layer to multilayer magnetic reversal changes.
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