Discovery of natural water-dispersible MoS2 quantum dots in bulk powder

Do Hyun Kim; Chulmin Kim; Doyoon Kim; Sang Yun Lee; Dong Jin Lee; Hong Dae Kim; Gyu Tae Kim

doi:10.1016/j.apsusc.2020.147661

Discovery of natural water-dispersible MoS₂ quantum dots in bulk powder

Do Hyun Kim, Chulmin Kim, Doyoon Kim, Sang Yun Lee, Dong Jin Lee, Hong Dae Kim, Gyu Tae Kim

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

2 Citations (Scopus)

Abstract

In contrast to laborious efforts to gain quantum dots (QDs) of two-dimensional (2D) layered materials, less attention has been given to the discovery of natural QDs present in the powder sample. In this study, we discovered that a considerable quantity of natural QDs are present in 2D powders and demonstrated a simple way to obtain MoS₂ QDs from a bulk powder without any chemical and severe ultrasonication. The natural MoS₂ QDs were obtained by filtering the MoS₂ powders dispersed in ethanol. The separated QDs resulted in a stable blue suspension in deionized water which exhibited the absorption spectra at a wavelength of 320 nm, supporting that MoS₂ QDs were successfully separated from the bulk powder. And, the maximum photoluminescence intensity appeared in the ultraviolet region under the excitation of 320 nm. Also, the doping effect of MoS₂ QDs on MoS₂ flakes led to the enhancement of photoluminescence spectra due to a hole carrier from MoS₂ QDs. Our finding paves the way to explore natural QDs from a powder sample of other 2D materials.

Original language	English
Article number	147661
Journal	Applied Surface Science
Volume	535
DOIs	https://doi.org/10.1016/j.apsusc.2020.147661
Publication status	Published - 2021 Jan 1

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 ) and by a grant from the Fundamental R&D program for Maritime hybrid composite industrialization project ( 10053826 , Development of core material technology based marine composites) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea).

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

Filtration
MoS
Quantum dot
Separation
Two dimensional materials

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces, Coatings and Films
Surfaces and Interfaces

Access to Document

10.1016/j.apsusc.2020.147661

Cite this

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title = "Discovery of natural water-dispersible MoS2 quantum dots in bulk powder",

abstract = "In contrast to laborious efforts to gain quantum dots (QDs) of two-dimensional (2D) layered materials, less attention has been given to the discovery of natural QDs present in the powder sample. In this study, we discovered that a considerable quantity of natural QDs are present in 2D powders and demonstrated a simple way to obtain MoS2 QDs from a bulk powder without any chemical and severe ultrasonication. The natural MoS2 QDs were obtained by filtering the MoS2 powders dispersed in ethanol. The separated QDs resulted in a stable blue suspension in deionized water which exhibited the absorption spectra at a wavelength of 320 nm, supporting that MoS2 QDs were successfully separated from the bulk powder. And, the maximum photoluminescence intensity appeared in the ultraviolet region under the excitation of 320 nm. Also, the doping effect of MoS2 QDs on MoS2 flakes led to the enhancement of photoluminescence spectra due to a hole carrier from MoS2 QDs. Our finding paves the way to explore natural QDs from a powder sample of other 2D materials.",

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author = "Kim, {Do Hyun} and Chulmin Kim and Doyoon Kim and Lee, {Sang Yun} and Lee, {Dong Jin} and Kim, {Hong Dae} 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 ) and by a grant from the Fundamental R&D program for Maritime hybrid composite industrialization project ( 10053826 , Development of core material technology based marine composites) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea). Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

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AU - Lee, Dong Jin

AU - Kim, Hong Dae

AU - Kim, Gyu Tae

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N2 - In contrast to laborious efforts to gain quantum dots (QDs) of two-dimensional (2D) layered materials, less attention has been given to the discovery of natural QDs present in the powder sample. In this study, we discovered that a considerable quantity of natural QDs are present in 2D powders and demonstrated a simple way to obtain MoS2 QDs from a bulk powder without any chemical and severe ultrasonication. The natural MoS2 QDs were obtained by filtering the MoS2 powders dispersed in ethanol. The separated QDs resulted in a stable blue suspension in deionized water which exhibited the absorption spectra at a wavelength of 320 nm, supporting that MoS2 QDs were successfully separated from the bulk powder. And, the maximum photoluminescence intensity appeared in the ultraviolet region under the excitation of 320 nm. Also, the doping effect of MoS2 QDs on MoS2 flakes led to the enhancement of photoluminescence spectra due to a hole carrier from MoS2 QDs. Our finding paves the way to explore natural QDs from a powder sample of other 2D materials.

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