Journal
NANOSCALE
Volume 8, Issue 38, Pages 16995-17003Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr04456e
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Funding
- Global Frontier Program through the Global Frontier Hybrid Interface Materials through the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [2013M3A6B1078873, 2013M3A6B1078882]
- Pioneer Research Center Program through the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [2014M3C1A3053024]
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [2015R1D1A1A09057297, 2015M3A7B7045496]
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We report the CVD synthesis of a monolayer of MoS2 nanoparticles such that the nanoparticle size was controlled over the range 5-100 nm and the chemical potential of sulfur was modified, both by controlling the hydrogen flow rate during the CVD process. As the hydrogen flow rate was increased, the reaction process of sulfur changed from a sulfiding process to a sulfo-reductive process, resulting in the growth of smaller MoS2 nanoparticles on the substrates. The size control, crystalline quality, chemical configuration, and distribution uniformity of the CVD-grown monolayer MoS2 nanoparticles were confirmed. The growth of the MoS2 nanoparticles at different edge states was studied using density functional theory calculations to clarify the size-tunable mechanism. A non-volatile memory device fabricated using the CVD-grown size-controlled 5 nm monolayer MoS2 nanoparticles as a floating gate showed a good memory window of 5-8 V and an excellent retention period of a decade.
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