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  1. Article ; Online: Generalised optical printing of photocurable metal chalcogenides.

    Baek, Seongheon / Ban, Hyeong Woo / Jeong, Sanggyun / Heo, Seung Hwae / Gu, Da Hwi / Choi, Wooyong / Choo, Seungjun / Park, Yae Eun / Yoo, Jisu / Choi, Moon Kee / Lee, Jiseok / Son, Jae Sung

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 5262

    Abstract: Optical three-dimensional (3D) printing techniques have attracted tremendous attention owing to their applicability to mask-less additive manufacturing, which enables the cost-effective and straightforward creation of patterned architectures. However, ... ...

    Abstract Optical three-dimensional (3D) printing techniques have attracted tremendous attention owing to their applicability to mask-less additive manufacturing, which enables the cost-effective and straightforward creation of patterned architectures. However, despite their potential use as alternatives to traditional lithography, the printable materials obtained from these methods are strictly limited to photocurable resins, thereby restricting the functionality of the printed objects and their application areas. Herein, we report a generalised direct optical printing technique to obtain functional metal chalcogenides via digital light processing. We developed universally applicable photocurable chalcogenidometallate inks that could be directly used to create 2D patterns or micrometre-thick 2.5D architectures of various sizes and shapes. Our process is applicable to a diverse range of functional metal chalcogenides for compound semiconductors and 2D transition-metal dichalcogenides. We then demonstrated the feasibility of our technique by fabricating and evaluating a micro-scale thermoelectric generator bearing tens of patterned semiconductors. Our approach shows potential for simple and cost-effective architecturing of functional inorganic materials.
    Language English
    Publishing date 2022-09-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-33040-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Ink Processing for Thermoelectric Materials and Power-Generating Devices.

    Jo, Seungki / Choo, Seungjun / Kim, Fredrick / Heo, Seung Hwae / Son, Jae Sung

    Advanced materials (Deerfield Beach, Fla.)

    2018  Volume 31, Issue 20, Page(s) e1804930

    Abstract: The growing concern over the depletion of hydrocarbon resources, and the adverse environmental effects associated with their use, has increased the demand for renewable energy sources. Thermoelectric (TE) power generation from waste heat has emerged as a ...

    Abstract The growing concern over the depletion of hydrocarbon resources, and the adverse environmental effects associated with their use, has increased the demand for renewable energy sources. Thermoelectric (TE) power generation from waste heat has emerged as a renewable energy source that does not generate any pollutants. Recently, ink-based processing for the preparation of TE materials has attracted tremendous attention because of the simplicity in design of power generators and the possibility of cost-effective manufacturing. In this progress report, recent advances in the development of TE inks, processing techniques, and ink-fabricated devices are reviewed. A summary of typical formulations of TE materials as inks is included, as well as a discussion on various ink-based fabrication methods, with several examples of newly designed devices fabricated using these techniques. Finally, the prospects of this field with respect to the industrialization of TE power generation technology are presented.
    Language English
    Publishing date 2018-12-28
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.201804930
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Solution-Processed Stretchable Ag

    Jo, Seungki / Cho, Soyoung / Yang, U Jeong / Hwang, Gyeong-Seok / Baek, Seongheon / Kim, Si-Hoon / Heo, Seung Hwae / Kim, Ju-Young / Choi, Moon Kee / Son, Jae Sung

    Advanced materials (Deerfield Beach, Fla.)

    2021  Volume 33, Issue 23, Page(s) e2100066

    Abstract: Compared with the large plastic deformation observed in ductile metals and organic materials, inorganic semiconductors have limited plasticity (<0.2%) due to their intrinsic bonding characters, restricting their widespread applications in stretchable ... ...

    Abstract Compared with the large plastic deformation observed in ductile metals and organic materials, inorganic semiconductors have limited plasticity (<0.2%) due to their intrinsic bonding characters, restricting their widespread applications in stretchable electronics. Herein, the solution-processed synthesis of ductile α-Ag
    Language English
    Publishing date 2021-04-30
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202100066
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: 3D microprinting of inorganic porous materials by chemical linking-induced solidification of nanocrystals.

    Song, Minju / Kim, Yoonkyum / Baek, Du San / Kim, Ho Young / Gu, Da Hwi / Li, Haiyang / Cunning, Benjamin V / Yang, Seong Eun / Heo, Seung Hwae / Lee, Seunghyun / Kim, Minhyuk / Lim, June Sung / Jeong, Hu Young / Yoo, Jung-Woo / Joo, Sang Hoon / Ruoff, Rodney S / Kim, Jin Young / Son, Jae Sung

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 8460

    Abstract: Three-dimensional (3D) microprinting is considered a next-generation manufacturing process for the production of microscale components; however, the narrow range of suitable materials, which include mainly polymers, is a critical issue that limits the ... ...

    Abstract Three-dimensional (3D) microprinting is considered a next-generation manufacturing process for the production of microscale components; however, the narrow range of suitable materials, which include mainly polymers, is a critical issue that limits the application of this process to functional inorganic materials. Herein, we develop a generalised microscale 3D printing method for the production of purely inorganic nanocrystal-based porous materials. Our process is designed to solidify all-inorganic nanocrystals via immediate dispersibility control and surface linking-induced interconnection in the nonsolvent linker bath and thereby creates multibranched gel networks. The process works with various inorganic materials, including metals, semiconductors, magnets, oxides, and multi-materials, not requiring organic binders or stereolithographic equipment. Filaments with a diameter of sub-10 μm are printed into designed complex 3D microarchitectures, which exhibit full nanocrystal functionality and high specific surface areas as well as hierarchical porous structures. This approach provides the platform technology for designing functional inorganics-based porous materials.
    Language English
    Publishing date 2023-12-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-44145-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Composition change-driven texturing and doping in solution-processed SnSe thermoelectric thin films.

    Heo, Seung Hwae / Jo, Seungki / Kim, Hyo Seok / Choi, Garam / Song, Jae Yong / Kang, Jun-Yun / Park, No-Jin / Ban, Hyeong Woo / Kim, Fredrick / Jeong, Hyewon / Jung, Jaemin / Jang, Jaeyoung / Lee, Won Bo / Shin, Hosun / Son, Jae Sung

    Nature communications

    2019  Volume 10, Issue 1, Page(s) 864

    Abstract: The discovery of SnSe single crystals with record high thermoelectric efficiency along the b-axis has led to the search for ways to synthesize polycrystalline SnSe with similar efficiencies. However, due to weak texturing and difficulties in doping, such ...

    Abstract The discovery of SnSe single crystals with record high thermoelectric efficiency along the b-axis has led to the search for ways to synthesize polycrystalline SnSe with similar efficiencies. However, due to weak texturing and difficulties in doping, such high thermoelectric efficiencies have not been realized in polycrystals or thin films. Here, we show that highly textured and hole doped SnSe thin films with thermoelectric power factors at the single crystal level can be prepared by solution process. Purification step in the synthetic process produced a SnSe-based chalcogenidometallate precursor, which decomposes to form the SnSe
    Language English
    Publishing date 2019-02-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-019-08883-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Colloidal Synthesis of Te-Doped Bi Nanoparticles: Low-Temperature Charge Transport and Thermoelectric Properties.

    Gu, Da Hwi / Jo, Seungki / Jeong, Hyewon / Ban, Hyeong Woo / Park, Sung Hoon / Heo, Seung Hwae / Kim, Fredrick / Jang, Jeong In / Lee, Ji Eun / Son, Jae Sung

    ACS applied materials & interfaces

    2017  Volume 9, Issue 22, Page(s) 19143–19151

    Abstract: Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles ... ...

    Abstract Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles under the quantum confinement regime is very challenging using conventional processes, owing to the difficulty in synthesis. Herein, we report the colloidal chemical synthesis of sub-10 nm-sized tellurium (Te)-doped Bismuth (Bi) nanoparticles with precisely controlled Te content from 0 to 5% and systematically investigate their low-temperature charge transport and thermoelectric properties. Microstructural characterization of nanoparticles demonstrates that Te ions are successfully incorporated into Bi nanoparticles rather than remaining on the nanoparticle surfaces. Low-temperature Hall measurement results of the hot-pressed Te-doped Bi-nanostructured materials, with grain sizes ranging from 30 to 60 nm, show that the charge transport properties are governed by the doping content and the related impurity and nanoscale grain boundary scatterings. Furthermore, the low-temperature thermoelectric properties reveal that the electrical conductivity and Seebeck coefficient expectedly change with the Te content, whereas the thermal conductivity is significantly reduced by Te doping because of phonon scattering at the sites arising from impurities and nanoscale grain boundaries. Accordingly, the 1% Te-doped Bi sample exhibits a higher figure-of-merit ZT by ∼10% than that of the undoped sample. The synthetic strategy demonstrated in this study offers the possibility of electronic doping of various quantum-confined nanoparticles for diverse applications.
    Language English
    Publishing date 2017-06-07
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.7b04404
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Colloidal Synthesis of Te-Doped Bi Nanoparticles: Low-Temperature Charge Transport and Thermoelectric Properties

    Gu, Da Hwi / Ban Hyeong Woo / Heo Seung Hwae / Jang Jeong In / Jeong Hyewon / Jo Seungki / Kim Fredrick / Lee Ji Eun / Park Sung Hoon / Son Jae Sung

    ACS Applied Materials & Interfaces. 2017 June 07, v. 9, no. 22

    2017  

    Abstract: Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles ... ...

    Abstract Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles under the quantum confinement regime is very challenging using conventional processes, owing to the difficulty in synthesis. Herein, we report the colloidal chemical synthesis of sub-10 nm-sized tellurium (Te)-doped Bismuth (Bi) nanoparticles with precisely controlled Te content from 0 to 5% and systematically investigate their low-temperature charge transport and thermoelectric properties. Microstructural characterization of nanoparticles demonstrates that Te ions are successfully incorporated into Bi nanoparticles rather than remaining on the nanoparticle surfaces. Low-temperature Hall measurement results of the hot-pressed Te-doped Bi-nanostructured materials, with grain sizes ranging from 30 to 60 nm, show that the charge transport properties are governed by the doping content and the related impurity and nanoscale grain boundary scatterings. Furthermore, the low-temperature thermoelectric properties reveal that the electrical conductivity and Seebeck coefficient expectedly change with the Te content, whereas the thermal conductivity is significantly reduced by Te doping because of phonon scattering at the sites arising from impurities and nanoscale grain boundaries. Accordingly, the 1% Te-doped Bi sample exhibits a higher figure-of-merit ZT by ∼10% than that of the undoped sample. The synthetic strategy demonstrated in this study offers the possibility of electronic doping of various quantum-confined nanoparticles for diverse applications.
    Keywords bismuth ; electrical conductivity ; ions ; nanoparticles ; synthesis ; tellurium ; thermal conductivity
    Language English
    Dates of publication 2017-0607
    Size p. 19143-19151.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021%2Facsami.7b04404
    Database NAL-Catalogue (AGRICOLA)

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