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  1. Article ; Online: Three-Dimensional Porous Nitrogen-Doped NiO Nanostructures as Highly Sensitive NO2 Sensors

    Van Hoang Luan / Huynh Ngoc Tien / Seung Hyun Hur / Jong Hun Han / Wonoh Lee

    Nanomaterials, Vol 7, Iss 10, p

    2017  Volume 313

    Abstract: Nickel oxide has been widely used in chemical sensing applications, because it has an excellent p-type semiconducting property with high chemical stability. Here, we present a novel technique of fabricating three-dimensional porous nitrogen-doped nickel ... ...

    Abstract Nickel oxide has been widely used in chemical sensing applications, because it has an excellent p-type semiconducting property with high chemical stability. Here, we present a novel technique of fabricating three-dimensional porous nitrogen-doped nickel oxide nanosheets as a highly sensitive NO2 sensor. The elaborate nanostructure was prepared by a simple and effective hydrothermal synthesis method. Subsequently, nitrogen doping was achieved by thermal treatment with ammonia gas. When the p-type dopant, i.e., nitrogen atoms, was introduced in the three-dimensional nanostructures, the nickel-oxide-nanosheet-based sensor showed considerable NO2 sensing ability with two-fold higher responsivity and sensitivity compared to non-doped nickel-oxide-based sensors.
    Keywords sensor ; porous nanostructure ; nickel oxide ; nitrogen doping ; NO2 gas sensor ; Chemistry ; QD1-999
    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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  2. Article: Electrophoretic deposition of aramid nanofibers on carbon fibers for highly enhanced interfacial adhesion at low content

    Lee, Jea Uk / Byeongho Park / Byeong-Su Kim / Dae-Ryung Bae / Wonoh Lee

    Composites. 2016 May, v. 84

    2016  

    Abstract: Here, an anodic electrophoretic deposition was adopted to facilitate the large-scale uniform coating of nano-fillers onto carbon fibers to enhance the interfacial properties between carbon fibers and epoxy matrix. As interface–reinforcing materials, ... ...

    Abstract Here, an anodic electrophoretic deposition was adopted to facilitate the large-scale uniform coating of nano-fillers onto carbon fibers to enhance the interfacial properties between carbon fibers and epoxy matrix. As interface–reinforcing materials, aramid nanofibers were introduced because of their superior mechanical properties and epoxy matrix-friendly functional groups. Furthermore, aramid nanofibers can be readily coated on carbon fibers via electrophoretic deposition because they are negatively-charged in solution with high electrical mobility. Finally, aramid nanofiber-coated carbon fibers showed significantly improved interfacial properties such as higher surface free energy and interfacial shear strengths (39.7% and 34.9% increases, respectively) than those of a pristine carbon fiber despite a very small amount of embedding (0.025wt% of aramid nanofibers in a carbon fiber), and the short beam strength of the laminated composite prepared with the aramid nanofiber-coated carbon fibers was also improved by 17.0% compared to a non-modified composite.
    Keywords adhesion ; carbon fibers ; coatings ; composite materials ; electrophoresis ; epoxides ; Gibbs free energy ; mechanical properties ; moieties ; nanofibers
    Language English
    Dates of publication 2016-05
    Size p. 482-489.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2012223-8
    ISSN 1359-835X
    ISSN 1359-835X
    DOI 10.1016/j.compositesa.2016.02.029
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Effect of phenoxy-based coating resin for reinforcing pitch carbon fibers on the interlaminar shear strength of PA6 composites

    Yi, Jin Woo / Dong Gi Seong / Hee Jeong Won / Joon-Hyung Byun / Moon Kwang Um / Sang Woo Kim / Wonoh Lee

    Composites. 2016 Aug., v. 87

    2016  

    Abstract: Carbon fiber-reinforced thermoplastic composites have not been considered as constituent materials for structural parts due to the poor interfacial adhesion between the fiber and the thermoplastic matrix. In this work, polyamide 6 (PA6) composites with ... ...

    Abstract Carbon fiber-reinforced thermoplastic composites have not been considered as constituent materials for structural parts due to the poor interfacial adhesion between the fiber and the thermoplastic matrix. In this work, polyamide 6 (PA6) composites with pitch carbon fibers (pCF) were fabricated by alternatively stacking PA6 films and pCF fabrics followed by being pressed. In order to improve the interfacial adhesion, phenoxy resin-based materials were coated on the surface of the fiber. The surface analyses of the fiber were carried out by XPS, TGA and dynamic contact angle method. Interlaminar shear strength (ILSS) of the composites was measured to evaluate the effect of the coating materials. The results showed that the composites with the coated pCF had higher ILSS than that with neat pCF by more than 20%. This indicated that a proper coating material can improve mechanical properties of the PA6 composites, which can be applied to the structural parts.
    Keywords adhesion ; carbon ; carbon fibers ; coatings ; composite materials ; contact angle ; fabrics ; polyamides ; shear strength ; thermogravimetry ; thermoplastics ; X-ray photoelectron spectroscopy
    Language English
    Dates of publication 2016-08
    Size p. 212-219.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2012223-8
    ISSN 1359-835X
    ISSN 1359-835X
    DOI 10.1016/j.compositesa.2016.04.028
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Nano structural analysis on stiffening phenomena of PAN-based carbon fibers during tensile deformation

    Zhou, Gengheng / Byung-Sun Kim / Jin-Woo Yi / Jong-Kyu Park / Joon-Hyung Byun / Lianlong He / Sang-Bok Lee / Sang-Kwan Lee / Seung-Geol Lee / Wonoh Lee

    Carbon. 2014 Sept., v. 76

    2014  

    Abstract: The effects of inner microstructures, including crystallite size, orientation and defects on the stiffening phenomena of PAN-based T300 carbon fibers under tension were explored. Single-fiber tensile test was conducted on three types of fiber: as ... ...

    Abstract The effects of inner microstructures, including crystallite size, orientation and defects on the stiffening phenomena of PAN-based T300 carbon fibers under tension were explored. Single-fiber tensile test was conducted on three types of fiber: as received, 1400 and 1600°C heat treated. The distribution of crystallite orientation in a fiber from core to skin was obtained by using transmission electron microscopy. The observations indicate the load-transfer between crystallites depends on the crystallite entanglement. The slide-lock of the entangled junctions among the loosely compacted crystallites is responsible for the increasing elastic modulus during tension. The sharp drop of tensile strength (−36%) of the fiber after heat treated at 1600°C was attributed to the increasing of crystallite size, nano-pore defects and a higher misalignment of crystallites in the core region.
    Keywords carbon ; carbon fibers ; crystallites ; deformation ; heat treatment ; microstructure ; modulus of elasticity ; tensile strength ; transmission electron microscopy
    Language English
    Dates of publication 2014-09
    Size p. 232-239.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2014.04.073
    Database NAL-Catalogue (AGRICOLA)

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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