Effect of Adventitious Carbon on Pit Formation of Monolayer MoS 2 | Zendy

Park Sangwook | Zendy; Siahrostami Samira | Zendy; Park Joonsuk | Zendy; Mostaghimi Amir Hassan Bagherzadeh | Zendy; Kim Taeho Roy | Zendy; Vallez Lauren | Zendy; Gill Thomas Mark | Zendy; Park Woosung | Zendy; Goodson Kenneth E. | Zendy; Sinclair Robert | Zendy; Zheng Xiaolin | Zendy

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Effect of Adventitious Carbon on Pit Formation of Monolayer MoS 2

Author(s) -

Park Sangwook,

Siahrostami Samira,

Park Joonsuk,

Mostaghimi Amir Hassan Bagherzadeh,

Kim Taeho Roy,

Vallez Lauren,

Gill Thomas Mark,

Park Woosung,

Goodson Kenneth E.,

Sinclair Robert,

Zheng Xiaolin

Publication year - 2020

Publication title -

advanced materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 10.707

H-Index - 527

eISSN - 1521-4095

pISSN - 0935-9648

DOI - 10.1002/adma.202003020

Subject(s) - monolayer , molybdenum disulfide , materials science , sulfur , transmission electron microscopy , oxygen , catalysis , adsorption , density functional theory , molybdenum , carbon fibers , nanoparticle , chemical engineering , nanotechnology , chemistry , computational chemistry , organic chemistry , metallurgy , composite material , composite number , engineering

Forming pits on molybdenum disulfide (MoS 2 ) monolayers is desirable for (opto)electrical, catalytic, and biological applications. Thermal oxidation is a potentially scalable method to generate pits on monolayer MoS 2 , and pits are assumed to preferentially form around undercoordinated sites, such as sulfur vacancies. However, studies on thermal oxidation of MoS 2 monolayers have not considered the effect of adventitious carbon (C) that is ubiquitous and interacts with oxygen at elevated temperatures. Herein, the effect of adventitious C on the pit formation on MoS 2 monolayers during thermal oxidation is studied. The in situ environmental transmission electron microscopy measurements herein show that pit formation is preferentially initiated at the interface between adventitious C nanoparticles and MoS 2 , rather than only sulfur vacancies. Density functional theory (DFT) calculations reveal that the C/MoS 2 interface favors the sequential adsorption of oxygen atoms with facile kinetics. These results illustrate the important role of adventitious C on pit formation on monolayer MoS 2 .

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