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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
Published on: November 28, 2017
Two-dimensional molybdenum disulfide nanoparticles intercalated between graphite layers: TEM observation and
Koya San-Yoshi1, Takehiko Sasaki2, Takeshi Kubota3
1Chemistry Course, Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University Ueda Morioka 020-8551 Japan mshirai@iwate-u.ac.jp.
None:
Two-dimensional molybdenum disulfide nanoparticles were formed in graphite interlayers by sulfurization and reduction-sulfurization treatments of a molybdenum chloride-intercalated graphite compound (MoCl5-GIC). When MoCl5-GIC was treated at 623 or 823 K under a flowing mixed gas of hydrogen sulfide and hydrogen, molybdenum disulfide nanosheets (MoS2-GIC(i)) with a thickness of 1-2 layers and lateral dimensions extending over several hundred nanometers were obtained. In contrast, when MoCl5-GIC was first reduced at 873 K under a hydrogen flow and subsequently sulfurized at 823 K under a mixed gas of hydrogen sulfide and hydrogen, molybdenum disulfide clusters (MoS2-GIC(ii)) with lateral dimensions of several tens of nanometers and consisting of 4-5 stacked layers were formed in the graphite interlayers. MoS2-GIC(i) and MoS2-GIC(ii) exhibited comparable catalytic activities for the hydrogenation of naphthalene; however, in the hydrodesulfurization of dibenzothiophene, MoS2-GIC(ii) showed higher desulfurization selectivity.
