Microscopic observation of catalytically etched channels and pits in MoS                         2                          flakes

Do Hyun Kim; Jun Hee Choi; Jun Eon Jin; Dong Jin Lee; Gyu Tae Kim

doi:10.1016/j.apsusc.2018.10.201

Microscopic observation of catalytically etched channels and pits in MoS ₂ flakes

Do Hyun Kim, Jun Hee Choi, Jun Eon Jin, Dong Jin Lee, Gyu Tae Kim

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

With a growing interest in two-dimensional transition metal dichalcogenide (TMD), etching the structure of TMD for further application is a challenge due to its thermal stability by a high melting point. Here, we report on diverse etched structures in MoS ₂ flakes based on the catalytic oxidation using a Co catalyst. After impregnated with a Co precursor, MoS ₂ flakes were oxidized in air by induction heating to obtain an etched structure. As a result, microscopic observation revealed that diverse etched structures in the shape of a channel and a pit were created in the MoS ₂ flakes. Especially, the catalytic etching by CoO nanoparticles produced two types of channels which have an angle of 120° and 150° respectively. Also, a pit with a depth of approximately 3 nm was found on the oxidized surface of MoS ₂ flakes. Our results open a new perspective to control the edge site of TMD flakes including S element as well as MoS ₂ flakes.

Original language	English
Pages (from-to)	1053-1058
Number of pages	6
Journal	Applied Surface Science
Volume	467-468
DOIs	https://doi.org/10.1016/j.apsusc.2018.10.201
Publication status	Published - 2019 Feb 15

Bibliographical note

Funding Information:
This research was supported by Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation of Korea (NRF) funded by KNPA , MSIT , MOTIE , ME , NFA ( NRF-2017M3D9A1073924 ).

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

Catalytic etching
Channel
Cobalt oxide
MoS
Oxidation
Pit

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

Access to Document

10.1016/j.apsusc.2018.10.201

Cite this

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title = " Microscopic observation of catalytically etched channels and pits in MoS 2 flakes ",

abstract = " With a growing interest in two-dimensional transition metal dichalcogenide (TMD), etching the structure of TMD for further application is a challenge due to its thermal stability by a high melting point. Here, we report on diverse etched structures in MoS 2 flakes based on the catalytic oxidation using a Co catalyst. After impregnated with a Co precursor, MoS 2 flakes were oxidized in air by induction heating to obtain an etched structure. As a result, microscopic observation revealed that diverse etched structures in the shape of a channel and a pit were created in the MoS 2 flakes. Especially, the catalytic etching by CoO nanoparticles produced two types of channels which have an angle of 120° and 150° respectively. Also, a pit with a depth of approximately 3 nm was found on the oxidized surface of MoS 2 flakes. Our results open a new perspective to control the edge site of TMD flakes including S element as well as MoS 2 flakes. ",

keywords = "Catalytic etching, Channel, Cobalt oxide, MoS, Oxidation, Pit",

author = "Kim, {Do Hyun} and Choi, {Jun Hee} and Jin, {Jun Eon} and Lee, {Dong Jin} and Kim, {Gyu Tae}",

note = "Funding Information: This research was supported by Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation of Korea (NRF) funded by KNPA , MSIT , MOTIE , ME , NFA ( NRF-2017M3D9A1073924 ). Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

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doi = "10.1016/j.apsusc.2018.10.201",

language = "English",

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AU - Kim, Do Hyun

AU - Choi, Jun Hee

AU - Jin, Jun Eon

AU - Lee, Dong Jin

AU - Kim, Gyu Tae

N1 - Funding Information: This research was supported by Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation of Korea (NRF) funded by KNPA , MSIT , MOTIE , ME , NFA ( NRF-2017M3D9A1073924 ). Publisher Copyright: © 2018 Elsevier B.V.

PY - 2019/2/15

Y1 - 2019/2/15

N2 - With a growing interest in two-dimensional transition metal dichalcogenide (TMD), etching the structure of TMD for further application is a challenge due to its thermal stability by a high melting point. Here, we report on diverse etched structures in MoS 2 flakes based on the catalytic oxidation using a Co catalyst. After impregnated with a Co precursor, MoS 2 flakes were oxidized in air by induction heating to obtain an etched structure. As a result, microscopic observation revealed that diverse etched structures in the shape of a channel and a pit were created in the MoS 2 flakes. Especially, the catalytic etching by CoO nanoparticles produced two types of channels which have an angle of 120° and 150° respectively. Also, a pit with a depth of approximately 3 nm was found on the oxidized surface of MoS 2 flakes. Our results open a new perspective to control the edge site of TMD flakes including S element as well as MoS 2 flakes.

AB - With a growing interest in two-dimensional transition metal dichalcogenide (TMD), etching the structure of TMD for further application is a challenge due to its thermal stability by a high melting point. Here, we report on diverse etched structures in MoS 2 flakes based on the catalytic oxidation using a Co catalyst. After impregnated with a Co precursor, MoS 2 flakes were oxidized in air by induction heating to obtain an etched structure. As a result, microscopic observation revealed that diverse etched structures in the shape of a channel and a pit were created in the MoS 2 flakes. Especially, the catalytic etching by CoO nanoparticles produced two types of channels which have an angle of 120° and 150° respectively. Also, a pit with a depth of approximately 3 nm was found on the oxidized surface of MoS 2 flakes. Our results open a new perspective to control the edge site of TMD flakes including S element as well as MoS 2 flakes.

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