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  1. Article ; Online: c

    Choi, Su-Hwan / Ryu, Seong-Hwan / Kim, Dong-Gyu / Kwag, Jae-Hyeok / Yeon, Changbong / Jung, Jaesun / Park, Young-Soo / Park, Jin-Seong

    Nano letters

    2024  Volume 24, Issue 4, Page(s) 1324–1331

    Abstract: Oxide semiconductors (OS) are attractive materials for memory and logic device applications owing to their low off-current, high field effect mobility, and superior large-area uniformity. Recently, successful research has reported the high field-effect ... ...

    Abstract Oxide semiconductors (OS) are attractive materials for memory and logic device applications owing to their low off-current, high field effect mobility, and superior large-area uniformity. Recently, successful research has reported the high field-effect mobility (μ
    Language English
    Publishing date 2024-01-17
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c04312
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Polyvinylalcohol (PVA)-Assisted Exfoliation of ReS

    Jung, Kwang Hoon / Yeon, Changbong / Yang, Junjae / Cheon, Ye Ji / Lim, Jung Wook / Yun, Sun Jin

    ACS applied materials & interfaces

    2021  Volume 13, Issue 7, Page(s) 8919–8928

    Abstract: Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their outstanding optoelectrical properties. Unlike most TMDs with layer-dependent photoresponsivity, rhenium disulfide ( ... ...

    Abstract Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their outstanding optoelectrical properties. Unlike most TMDs with layer-dependent photoresponsivity, rhenium disulfide (ReS
    Language English
    Publishing date 2021-02-11
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.0c20666
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Unimer-Assisted Exfoliation for Highly Concentrated Aqueous Dispersion Solutions of Single- and Few-Layered van der Waals Materials.

    Yeon, Changbong / Lee, Inyeal / Kim, Gil-Ho / Yun, Sun Jin

    Langmuir : the ACS journal of surfaces and colloids

    2017  Volume 33, Issue 5, Page(s) 1217–1226

    Abstract: We suggest a unimer-assisted exfoliation method for the exfoliation of van der Waals two-dimensional (2D) materials such as graphene, ... ...

    Abstract We suggest a unimer-assisted exfoliation method for the exfoliation of van der Waals two-dimensional (2D) materials such as graphene, MoS
    Language English
    Publishing date 2017-02-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.6b04121
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Unimer-Assisted Exfoliation for Highly Concentrated Aqueous Dispersion Solutions of Single- and Few-Layered van der Waals Materials

    Yeon, Changbong / Kim Gil-Ho / Lee Inyeal / Yun Sun Jin

    Langmuir. 2017 Feb. 07, v. 33, no. 5

    2017  

    Abstract: We suggest a unimer-assisted exfoliation method for the exfoliation of van der Waals two-dimensional (2D) materials such as graphene, MoS₂, and h-BN and show that the micellar size is a critical parameter for enhancing the exfoliation efficiency. To ... ...

    Abstract We suggest a unimer-assisted exfoliation method for the exfoliation of van der Waals two-dimensional (2D) materials such as graphene, MoS₂, and h-BN and show that the micellar size is a critical parameter for enhancing the exfoliation efficiency. To explain the effectiveness of the unimers in the exfoliation, the influence of the micellar size of a biocompatible block copolymer, Pluronic F-68, is evaluated in view of the yield and thickness of exfoliated 2D flakes. By the addition of water-soluble alcohols, the surfactants exist in the form of a unimer, which facilitates the intercalation into the layered materials and their exfoliation. The results showed that the high exfoliation efficiency could be achieved by controlling the micellar size mostly to be unimers; the average yield rate of MoS₂ exfoliation was 4.51% per hour, and the very high concentration of 1.45 mg/mL was obtained by sonication for 3 h. We also suggested the dielectrophoresis technique as a method for forming a film composed of 2D flakes for diverse applications requiring electrical signals. The unimer-assisted exfoliation method will be substantially utilized to achieve highly concentrated aqueous dispersion solutions of 2D materials.
    Keywords alcohols ; composite polymers ; dielectrophoresis ; graphene ; sonication ; surfactants ; van der Waals forces
    Language English
    Dates of publication 2017-0207
    Size p. 1217-1226.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021%2Facs.langmuir.6b04121
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Na-Cation-Assisted Exfoliation of MX

    Yeon, Changbong / Yun, Sun Jin / Yang, Junjae / Youn, Doo-Hyeb / Lim, Jung Wook

    Small (Weinheim an der Bergstrasse, Germany)

    2017  Volume 14, Issue 2

    Abstract: 2D nanosheets of transition metal dichalcogenides (TMDCs) have been attracting attention due to their sizable band gap. Facile and effective Na-cation-assisted exfoliation of TMDC ( ... ...

    Abstract 2D nanosheets of transition metal dichalcogenides (TMDCs) have been attracting attention due to their sizable band gap. Facile and effective Na-cation-assisted exfoliation of TMDC (MX
    Language English
    Publishing date 2017-11-24
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1613-6829
    ISSN (online) 1613-6829
    DOI 10.1002/smll.201702747
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: High-yield graphene exfoliation using sodium dodecyl sulfate accompanied by alcohols as surface-tension-reducing agents in aqueous solution

    Yeon, Changbong / Jung Wook Lim / Kyu-Sung Lee / Sun Jin Yun

    Carbon. 2015 Mar., v. 83

    2015  

    Abstract: The exfoliation of graphite was investigated in aqueous solutions containing sodium dodecyl sulfate (SDS) as a surfactant. The exfoliation was greatly enhanced near the surface aggregation concentration (SAC) of SDS, 2.6mM, and then decreased for higher ... ...

    Abstract The exfoliation of graphite was investigated in aqueous solutions containing sodium dodecyl sulfate (SDS) as a surfactant. The exfoliation was greatly enhanced near the surface aggregation concentration (SAC) of SDS, 2.6mM, and then decreased for higher SDS contents. However, the flakes exfoliated near the SAC were graphite, whereas graphene was obtained above the critical micelle concentration (CMC). The effect of the use of alcohols as surface-tension-reducing agents (STRAs) on the exfoliation was then investigated. With ethyl alcohol, a dispersion of 2.1mgml−1 graphene was achieved from 2.6mM SDS after only 1h of sonication, whereas a dispersion of 0.2mgml−1 was obtained above the CMC in the absence of STRAs. The results demonstrate that the SDS content near the SAC is highly beneficial for exfoliation as long as the surface tension is maintained near 41.0mNml−1. This finding supports the notion that the structure of the adsorbed SDS, depending on its concentration, strongly affects the exfoliation of graphite into graphene.
    Keywords aqueous solutions ; ethanol ; graphene ; micelles ; sodium dodecyl sulfate ; sonication ; surface tension ; surfactants
    Language English
    Dates of publication 2015-03
    Size p. 136-143.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2014.11.035
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Arbitrary alignment-angle control method of electrospun fibers: potential for a stretchable electrode material

    Youn, Doo-Hyeb / Yeon, Changbong / Choi, Jin Sik / Park, Nae-Man / Lee, Inyeal / Kim, Gil-Ho / Yun, Sun Jin

    RSC advances. 2017 Sept. 20, v. 7, no. 71

    2017  

    Abstract: Uniform and reproducible alignment methods for one-dimensional structures, such as wires, tubes, and fibers are essential for the fabrication of commercial devices. This paper presents an arbitrary alignment-angle control method. The mechanical ... ...

    Abstract Uniform and reproducible alignment methods for one-dimensional structures, such as wires, tubes, and fibers are essential for the fabrication of commercial devices. This paper presents an arbitrary alignment-angle control method. The mechanical stretching of arbitrarily aligned fibers can be increased by as much as 120%. Stretchable electrodes that stably maintain their electro-optical properties against large mechanical deformations are essential for the fabrication of wearable electronics. For randomly distributed fibers, fiber-to-fiber contact resistance has a detrimental effect on the carrier transport. The proposed method aligns fibers into a uniform array to reduce the fiber-to-fiber contact resistance between fibers using parallel-aligned bars. The results demonstrate the feasibility of applying the transfer-free alignment method along a specific alignment-angle for fabricating stretchable metal fiber networks. Fibers are aligned directly onto the sample surface by mounting the alignment jig onto the conventional collecting plate. This transfer-free strategy avoids the deformation and overlap of aligned patterns during the conventional transferring process.
    Keywords control methods ; deformation ; electrodes ; electronics
    Language English
    Dates of publication 2017-0920
    Size p. 44945-44953.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c7ra08223a
    Database NAL-Catalogue (AGRICOLA)

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