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Ryu, Jaehoon,Kim, Wookhwan,Yun, Juyoung,Lee, Kisu,Lee, Jungsup,Yu, Haejun,Kim, Jae Hyun,Kim, Jae Jeong,Jang, Jyongsik American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.14
<P>A simple one-pot method is reported for the fabrication of uniform wrinkled silica nanoparticles (WSNs). Rapid cooling of reactants at the appropriate moment during synthesis allowed the separation of nucleation and growth stages, resulting in uniform particles. The factors affecting particle size and interwrinkle distance were also investigated. WSNs with particle sizes of 65-400 nm, interwrinkle distances of 10-33 nm, and surface areas up to 617 m<SUP>2</SUP> g<SUP>-1</SUP> were fabricated. Furthermore, our results demonstrate the advantages of WSNs over comparable nonporous silica nanospheres and fumed silica-based products as an abrasive material in chemical mechanical planarization processes.</P> [FIG OMISSION]</BR>
Ryu, Jaehoon,Lee, Eunwoo,Lee, Seungae,Jang, Jyongsik The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.98
<P>A novel approach to link graphene quantum dots (GQDs) with graphene was explored <I>via</I> chemical surface modification of graphene using 1,5-diaminonapthalene (DAN).</P> <P>Graphic Abstract</P><P>A novel approach to link graphene quantum dots (GQDs) with graphene was explored <I>via</I> chemical surface modification of graphene using 1,5-diaminonapthalene (DAN) and the GDGS have been demonstrated as photocatalysts having high efficiencies suggesting its potential applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc06567k'> </P>
Hierarchical mesoporous silica nanoparticles as superb light scattering materials
Ryu, Jaehoon,Yun, Juyoung,Lee, Jungsup,Lee, Kisu,Jang, Jyongsik The Royal Society of Chemistry 2016 Chemical communications Vol.52 No.10
<P>A novel approach to enhance the light scattering effect was explored by applying hierarchical silica nanoparticles in DSSCs as scattering layers. The WSN-incorporated cells showed a PCE value of 9.53% and a PCE enhancement of 30.19% compared with those of the reference cells.</P>
Ryu, Jaehoon,Lee, Jong Woo,Yu, Haejun,Yun, Juyoung,Lee, Kisu,Lee, Jungsup,Hwang, Doyk,Kang, Jooyoun,Kim, Seong Keun,Jang, Jyongsik The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.32
<P>Research on the addition of suitable materials into perovskite solar cells (PSCs) for improved performance is as important as the fabrication of efficient perovskite films themselves. An attempt to enhance the performance of planar-type perovskite solar cells was performed by introducing graphene quantum dots (GQDs) onto a blocking TiO2layer<I>via</I>O2plasma treatment. Furthermore, the bandgap of the GQDs was tuned through their size control and the effects of the GQD size on cell performance were explored. The GQDs can induce fast electron extraction and the formation of the improved perovskite quality. The devices with appropriately sized-GQDs showed an average of 10% enhancement compared with those of cells without GQDs and achieved 19.11% as the best power conversion efficiency (PCE). Furthermore, GQDs contributed to the reduction in the extent of current-voltage hysteresis, which was attributed to the planar structure.</P>
Ryu, Jaehoon,Lee, Eunwoo,Lee, Kisu,Jang, Jyongsik The Royal Society of Chemistry 2015 Journal of Materials Chemistry B Vol.3 No.24
<P>Graphene quantum dots (GQDs) with two different diameters were modified with a Eu<SUP>III</SUP>-macromolecule complex and applied in dual emission fluorescent sensors for detection of <I>Bacillus anthracis</I> spores. The Eu-GQD sensors exhibited a morphology of ultrafine particles, increased surface-to-volume ratio, enhanced dispersibility, and extraordinary sensitivity. The 3 nm Eu-GQDs showed three emission bands, which are ascribed to the emission from the blue GQDs (435 nm) and the red [(Eu)-(DPA)] complex (593 nm and 616 nm). Accordingly, incorporation of the GQDs as a non-interfering internal calibration makes it possible for use as a ratiometric sensor. The time dependent fluorescence response study revealed that the reaction was complete within 8 s, thus enabling rapid detection of <I>B. anthracis</I> spores. It is noteworthy that the Eu-GQD sensors exhibited an extraordinary limit of detection (LOD) of <I>ca.</I> 10 pM towards <I>B. anthracis</I>, which is six orders of magnitude smaller than the infectious dose of the spores (60 μM). Furthermore, the selectivity study indicates that Eu-GQD sensors have an outstanding selectivity of 103-fold for DPA over competing aromatic ligands.</P>
JCP Behavior with Traffic and Temperature Loadings: Analysis of a Test Road in Korea
Ryu, SungWoo,Lee, Jaehoon,Kwon, Soonmin,Cho, Yoon-Ho American Society of Civil Engineers 2017 Journal of performance of constructed facilities Vol.31 No.5
<P>Because traffic and environmental loadings cause concrete pavement failure, a large budget is allocated for maintenance. Through understanding the effect of traffic and temperature loadings on pavement behavior or performance, concrete pavement design can be improved. Hence, this study focuses on the behavior of jointed concrete pavement (JCP) with traffic and temperature loadings by analyzing data from a test road in Korea. Strain gauges, displacement sensors, temperature sensors, and demec gauges were used to evaluate JCP behavior. Static loading, temperature loading, and falling weight deflectometer tests were also conducted. Strain, stress, vertical movement, and joint movement were evaluated based on different slab thicknesses, measurement locations, and substructures. Overall, temperature loading was a governing factor in JCP movement. Measurement location, thickness, substructure, and depth also affect JCP behavior. In the future, the behavior of JCP will be clearer with more acquired data, which will be used in the design of Korean concrete pavement. (C) 2017 American Society of Civil Engineers.</P>