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  1. Article ; Online: Improving Stability of Roll-to-Roll (R2R) Gravure-Printed Carbon Nanotube-Based Thin Film Transistors via R2R Plasma-Enhanced Chemical Vapor-Deposited Silicon Nitride

    Sagar Shrestha / Sajjan Parajuli / Jinhwa Park / Hao Yang / Tae-Yeon Cho / Ji-Ho Eom / Seong-Keun Cho / Jongsun Lim / Gyoujin Cho / Younsu Jung

    Nanomaterials, Vol 13, Iss 559, p

    2023  Volume 559

    Abstract: Single-walled carbon nanotubes (SWCNTs) have an advantage in printing thin film transistors (TFTs) due to their high carrier mobility, excellent chemical stability, mechanical flexibility, and compatibility with solution-based processing. Thus, the ... ...

    Abstract Single-walled carbon nanotubes (SWCNTs) have an advantage in printing thin film transistors (TFTs) due to their high carrier mobility, excellent chemical stability, mechanical flexibility, and compatibility with solution-based processing. Thus, the printed SWCNT-based TFTs (pSWCNT-TFTs) showed significant technological potential such as integrated circuits, conformable sensors, and display backplanes. However, the long-term environmental stability of the pSWCNT-TFTs hinders their commercialization. Thus, to extend the stability of the pSWCNT-TFTs, such devices should be passivated with low water and oxygen permeability. Herein, we introduced the silicon nitride (SiNx) passivation method on the pSWCNT-TFTs via a combination of roll-to-roll (R2R) gravure and the roll-to-roll plasma-enhanced vapor deposition (R2R-PECVD) process at low temperature (45 °C). We found that SiNx-passivated pSWCNT-TFTs showed ± 0.50 V of threshold voltage change at room temperature for 3 days and ±1.2 V of threshold voltage change for 3 h through a Temperature Humidity Test (85/85 test: Humidity 85%/Temperature 85 °C) for both p-type and n-type pSWCNT-TFTs. In addition, we found that the SiNx-passivated p-type and n-type pSWCNT-TFT-based CMOS-like ring oscillator, or 1-bit code generator, operated well after the 85/85 test for 24 h.
    Keywords roll to roll ; PECVD ; passivation ; threshold voltage ; silicon nitride ; 85/85 test ; Chemistry ; QD1-999
    Subject code 600
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Flexible Piezoelectric Generators by Using the Bending Motion Method of Direct-Grown-PZT Nanoparticles on Carbon Nanotubes

    Jin Kyu Han / Do Hyun Jeon / Sam Yeon Cho / Sin Wook Kang / Jongsun Lim / Sang Don Bu

    Nanomaterials, Vol 7, Iss 10, p

    2017  Volume 308

    Abstract: Recently, composite-type nanogenerators (NGs) formed from piezoelectric nanostructures and multi-walled carbon nanotubes (CNTs), have become one of the excellent candidates for future energy harvesting because of their ability to apply the excellent ... ...

    Abstract Recently, composite-type nanogenerators (NGs) formed from piezoelectric nanostructures and multi-walled carbon nanotubes (CNTs), have become one of the excellent candidates for future energy harvesting because of their ability to apply the excellent electrical and mechanical properties of CNTs. However, the synthesis of NG devices with a high proportion of piezoelectric materials and a low polymer content, such as of polydimethylsiloxane (PDMS), continues to be problematic. In this work, high-piezoelectric-material-content flexible films produced from Pb(Zr,Ti)O3 (PZT)-atomically-interconnected CNTs and polytetrafluoroethylene (PTFE) are presented. Various physical and chemical characterization techniques are employed to examine the morphology and structure of the materials. The direct growth of the piezoelectric material on the CNTs, by stirring the PZT and CNT mixed solution, results in various positive effects, such as a high-quality dispersion in the polymer matrix and addition of flexoelectricity to piezoelectricity, resulting in the enhancement of the output voltage by an external mechanical force. The NGs repeatedly generate an output voltage of 0.15 V. These results present a significant step toward the application of NGs using piezoelectric nanocomposite materials.
    Keywords piezoelectric nanogenerator ; composite material ; bending movement ; Chemistry ; QD1-999
    Subject code 600
    Language English
    Publishing date 2017-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: High energy electron beam stimulated nanowelding of silver nanowire networks encapsulated with graphene for flexible and transparent electrodes

    Su Jin Lee / Young Bum Lee / Yi Rang Lim / Jin Kyu Han / In Su Jeon / Garam Bae / Yeoheung Yoon / Wooseok Song / Sung Myung / Jongsun Lim / Ki-Seok An / Sun Sook Lee

    Scientific Reports, Vol 9, Iss 1, Pp 1-

    2019  Volume 8

    Abstract: Abstract Low-dimensional nanostructures and their complementary hybridization techniques are in the vanguard of technological advances for applications in transparent and flexible nanoelectronics due to the intriguing electrical properties related to ... ...

    Abstract Abstract Low-dimensional nanostructures and their complementary hybridization techniques are in the vanguard of technological advances for applications in transparent and flexible nanoelectronics due to the intriguing electrical properties related to their atomic structure. In this study, we demonstrated that welding of Ag nanowires (NWs) encapsulated in graphene was stimulated by flux-optimized, high-energy electron beam irradiation (HEBI) under ambient conditions. This methodology can inhibit the oxidation of Ag NWs which is induced by the inevitably generated reactive ozone as well as improve of their electrical conductivity. We have systematically explored the effects of HEBI on Ag NWs and graphene. The optimized flux for HEBI welding of the Ag NWs with graphene was 150 kGy, which decreased the sheet resistance of the graphene/Ag NWs to 12 Ohm/sq. Following encapsulation with graphene, the initial chemical states of the Ag NWs were well-preserved after flux-tuned HEBI, whereas graphene underwent local HEBI-induced defect generation near the junction area. We further employed resonant Raman spectroscopy to follow the structural evolution of the sacrificial graphene in the hybrid film after HEBI. Notably, the sheet resistance of the welded Ag NWs encapsulated with graphene after HEBI was well-maintained even after 85 days.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2019-06-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Flexible chemical sensors based on hybrid layer consisting of molybdenum disulphide nanosheets and carbon nanotubes

    Kim, Sungho / Jinkyu Han / Jongsun Lim / Ki-Seok An / Min-A. Kang / Sang-Woo Kim / Sun Sook Lee / Sung Myung / Wooseok Song

    Carbon. 2018 Apr., v. 129

    2018  

    Abstract: A facile synthesis method was developed for preparing hybrid 2-dimensional (2D) films, based on large-scale molybdenum disulfide (MoS2) nanosheets and single-walled carbon nanotubes (SWCNTs), for flexible sensors. Here, 1-dimensional (1D) SWCNTs were ... ...

    Abstract A facile synthesis method was developed for preparing hybrid 2-dimensional (2D) films, based on large-scale molybdenum disulfide (MoS2) nanosheets and single-walled carbon nanotubes (SWCNTs), for flexible sensors. Here, 1-dimensional (1D) SWCNTs were combined with MoS2 nanosheets during the MoS2 synthesis process for improving the flexibility and stability of the 2D MoS2 nanosheet. Uniform MoS2 nanosheets were successfully synthesized via chemical vapor deposition (CVD) using a porphyrin-type organic promoter. This study demonstrates the high performance and enhanced sensitivity of the chemical gas sensors that were fabricated using hybrid MoS2-SWCNT layers; the enhancement is due to the sensitive gas adsorption by SWCNTs in the MoS2 nanosheets. In addition, the hybrid MoS2-SWCNT films, transferred on a flexible polyethylene terephthalate (PET) substrate, were employed for the analysis of physical properties of chemical sensors as a function of the number of bending cycles. The hybrid MoS2-SWCNT-based sensors showed stable sensing performance after 105 bending cycles, whereas the resistance of MoS2-based sensors increased to approximately 300% under the same bending process.
    Keywords adsorption ; carbon ; carbon nanotubes ; molybdenum disulfide ; nanosheets ; physical properties ; polyethylene terephthalates ; vapors
    Language English
    Dates of publication 2018-04
    Size p. 607-612.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2017.12.065
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Facile microwave assisted synthesis of vastly edge exposed 1T/2H-MoS₂ with enhanced activity for hydrogen evolution catalysis

    Lee, Young Bum / Seong K. Kim / Seulgi Ji / Wooseok Song / Hee-Suk Chung / Moon Kang Choi / Minbaek Lee / Sung Myung / Jongsun Lim / Ki-Seok An / Sun Sook Lee

    Journal of materials chemistry A. 2019 Feb. 19, v. 7, no. 8

    2019  

    Abstract: Energy technologies of the near future will heavily rely on electrochemical systems; hence, the importance of research on electrocatalytically active materials can never be emphasized enough. For hydrogen evolution, precious metal catalysts (e.g. ... ...

    Abstract Energy technologies of the near future will heavily rely on electrochemical systems; hence, the importance of research on electrocatalytically active materials can never be emphasized enough. For hydrogen evolution, precious metal catalysts (e.g. platinum) are the acclaimed performers, but recently, two-dimensional transition metal dichalcogenides (TMDs) have been receiving immense interest due to their noteworthy catalytic activity and earth-abundance. In particular, molybdenum disulfide (MoS₂) in its metallic 1T-phase is known to exhibit outstanding performance; thus, utilizing 1T-MoS₂ is of high interest. Here, MoS₂ is synthesized via a microwave-assisted solvothermal method (MoS₂-MW). Remarkably, the MoS₂-MW film revealed randomly oriented flake-like grains; thus, highly active edge-sites are vastly exposed to the surface. Moreover, investigations of the film exposed the highly stable structural hybrid of the 1T- and 2H-phases, which remarkably exhibits electrocatalytic attributes of pure 1T-MoS₂ with superb catalytic activity. The method allows synthesis of MoS₂-MW over morphologically complex conducting substrates to increase both the number and catalytic activity of active sites for hydrogen evolution.
    Keywords active sites ; catalysts ; catalytic activity ; electrochemistry ; energy ; hydrogen production ; microwave treatment ; molybdenum disulfide ; platinum
    Language English
    Dates of publication 2019-0219
    Size p. 3563-3569.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c8ta12080c
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Fabrication of flexible optoelectronic devices based on MoS2/graphene hybrid patterns by a soft lithographic patterning method

    Kang, Min-A / Chong-Yun Park / Jongsun Lim / Ki-Seok An / Seong Jun Kim / Sun Sook Lee / Sung Myung / Sung-jin Chang / Wooseok Song

    Carbon. 2017 May, v. 116

    2017  

    Abstract: A cross-stacking MoS2/graphene hybrid patterns for the application to advanced flexible opto-electronic devices have been demonstrated by soft-lithographic patterning method. Well-defined MoS2/graphene hybrid pattern was fabricated simply by a soft ... ...

    Abstract A cross-stacking MoS2/graphene hybrid patterns for the application to advanced flexible opto-electronic devices have been demonstrated by soft-lithographic patterning method. Well-defined MoS2/graphene hybrid pattern was fabricated simply by a soft lithographic patterning technique. In-depth exploration for the optical properties of diverse cross-stacking photodetectors based on MoS2/graphene patterns was carried out. In addition, cross-stacking MoS2/graphene was demonstrated onto a flexible polyethylene terephthalate (PET) substrate for the analysis of physical properties of devices. Substantially, this method should pave the way for realistic applications of transparent and flexible nano-electronic devices based on 2D materials.
    Keywords carbon ; hybrids ; optical properties ; physical properties ; polyethylene terephthalates
    Language English
    Dates of publication 2017-05
    Size p. 167-173.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2017.02.001
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Au doping effect on chemically-exfoliated graphene and graphene grown via chemical vapor deposition

    Kim, Ki Woong / Jongsun Lim / Ki-Seok An / Min Wook Jung / Min-A Kang / Soon Yeol Kwon / Sun Sook Lee / Sung Myung / Wooseok Song

    Carbon. 2015 Feb., v. 82

    2015  

    Abstract: In order to assess the most suitable way for application of graphene-based flexible transparent electrodes, the effects of Au doping and subsequent annealing on graphene films produced by chemical exfoliation and chemical vapor deposition (CVD) were ... ...

    Abstract In order to assess the most suitable way for application of graphene-based flexible transparent electrodes, the effects of Au doping and subsequent annealing on graphene films produced by chemical exfoliation and chemical vapor deposition (CVD) were explored. After Au doping and subsequent annealing, uniformly-sized Au nanoparticles (NPs) were distributed on CVD-graphene films and reduced graphene oxide (rGO) films and the density of the Au NPs on rGO films was greater than that on CVD-graphene films. Interestingly, CVD-graphene films have sheet resistance behavior opposite to that of rGO films after Au doping and subsequent annealing. This can be understood by combined features including an increase in carrier concentration via p-type doping and an increase in contact resistance via the intercalation of non-conducting AuCl3 nanoparticles, as suggested by the work function measurement of CVD-graphene and rGO films before and after Au doping. This finding will shed light on an effective way to obtain large-scale and work function-tuned graphene films for applications in graphene-based flexible transparent electrodes.
    Keywords annealing ; behavioral resistance ; electrodes ; gold ; graphene ; graphene oxide ; nanogold ; nanoparticles ; vapors
    Language English
    Dates of publication 2015-02
    Size p. 96-102.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2014.10.036
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Strain-Gradient Effect in Gas Sensors Based on Three-Dimensional Hollow Molybdenum Disulfide Nanoflakes

    Kang, Min-A / Jin Kyu Han / Sam Yeon Cho / Sang Don Bu / Chong-Yun Park / Sung Myung / Wooseok Song / Sun Sook Lee / Jongsun Lim / Ki-Seok An

    ACS applied materials & interfaces. 2017 Dec. 20, v. 9, no. 50

    2017  

    Abstract: A novel three-dimensional transition metal dichalcogenide (TMD) structure consisting of seamless hollow nanoflakes on two-dimensional basal layers was synthesized by a one-step chemical vapor deposition method. Here, we demonstrate that the as-grown ... ...

    Abstract A novel three-dimensional transition metal dichalcogenide (TMD) structure consisting of seamless hollow nanoflakes on two-dimensional basal layers was synthesized by a one-step chemical vapor deposition method. Here, we demonstrate that the as-grown nanoflakes are formed on an organic promoter layer which served as a positive template and are swollen at the grain boundaries by the bubbling effect. TMD nanosheets with hollow nanoflakes are successfully applied as chemical sensors, and it was found that their gas adsorption property is strongly related to the internal strain gradient resulting from the variation in the lattice parameter. This result is consistent with the theoretical prediction in previous studies. Our chemical vapor deposition-based approach is an efficient way to generate TMD-based nanostructures over a large surface area for various practical applications such as chemical sensors.
    Keywords adsorption ; molybdenum disulfide ; nanosheets ; prediction ; surface area ; vapors
    Language English
    Dates of publication 2017-1220
    Size p. 43799-43806.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.7b14262
    Database NAL-Catalogue (AGRICOLA)

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