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Kang, Suhee,Jang, Joonyoung,Pawar, Rajendra C.,Ahn, Sunghoon,Lee, Caroline Sunyong The Royal Society of Chemistry 2018 Dalton Transactions Vol.47 No.21
<P>We report the coating of metal-free graphitic carbon nitride (g-C3N4) onto titanium dioxide (TiO2) nanorods <I>via</I> a thermal evaporation method. Prior to g-C3N4 coating, TiO2 nanoclusters were grown on TiO2 nanorods to enhance the surface area by dipping in a TiCl3 solution for 12, 24 and 36 h. The prepared films were analyzed to assess the improvement in absorbance and reduction in recombination losses. Nanoclustered TiO2 grown for 24 h and then coated with a g-C3N4 film (<I>i.e.</I>, TC_24h_CN) had the highest photocurrent of 235 and 290 μA, respectively, when measured by transient photocurrent and linear sweep voltammetry techniques. The enhanced performance resulted from a reduced recombination of electron-hole pairs. The TC_24h_CN film displayed an excellent photoresponse over 15 h of exposure to visible light and hence could potentially be used in water purification device technology.</P>
Size-controlled BiOCl–RGO composites having enhanced photodegradative properties
Kang, Suhee,Pawar, Rajendra C.,Pyo, Youngjun,Khare, Varsha,Lee, Caroline Sunyong Taylor Francis 2016 Journal of experimental nanoscience Vol.11 No.4
<P>Visible light-active bismuth oxychloride-reduced graphene oxide (BiOCl-RGO) composite photocatalysts were synthesised using a hydrothermal method at low temperature, and at a low cost. This approach reduced the recombination of electron-hole pairs and thereby provided more efficient photocatalysts. The size of BiOCl structure was controlled by polyvinylpyrrolidone (PVP) addition. Furthermore, formation of nanosized BiOCl sheets and BiOCl-RGO composites were confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. Fabricated BiOCl-RGO composite with PVP exhibited better photocatalytic activity than pure BiOCl grown with and without PVP towards degradation of Rhodamine B (RhB). It was found that the composite photocatalyst degrades RhB completely within 310 min as compared with several hours for pure BiOCl. The improved photocatalytic performance of BiOCl-RGO composite was attributed to its high specific surface area (22.074 m(2) g(-1) and existence of polar surfaces, compared with 9.831 m(2) g(-1) for pure BiOCl). The analyses indicated that RGO helped to reduce recombination losses and improve electron transport. It also showed that presence of polar surfaces improved photocatalytic activity of BiOCl. Hence, BiOCl-RGO composite is a promising catalyst for the degradation of organic pollutants under visible light and could be used in applications such as water purification devices.</P>
Kang, Suhee,Pawar, Rajendra C.,Park, Tae Joon,Kim, Jin Geum,Ahn, Sung-Hoon,Lee, Caroline Sunyong The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.4
We have successfully fabricated 3D (3-dimensional) nanostructures of $TiO_2$ coated with a $g-C_3N_4$ layer via hydrothermal and sintering methods to enhance photoelectrochemical (PEC) performance. Due to the coupling of $TiO_2$ and $g-C_3N_4$, the nanostructures exhibited good performance as the higher conduction band of $g-C_3N_4$, which can be combined with $TiO_2$. To fabricate 3D nanostructures of $g-C_3N_4/TiO_2$, $TiO_2$ was first grown as a double layer structure on FTO (Fluorine-doped tin oxide) substrate at $150^{\circ}C$ for 3 h. After this, the $g-C_3N_4$ layer was coated on the $TiO_2$ film at $520^{\circ}C$ for 4 h. As-prepared samples were varied according to loading of melamine powder, with values of loading of 0.25 g, 0.5 g, 0.75 g, and 1 g. From SEM and TEM analysis, it was possible to clearly observe the 3D sample morphologies. From the PEC measurement, 0.5 g of $g-C_3N_4/TiO_2$ film was found to exhibit the highest current density of $0.12mA/cm^2$, along with a long-term stability of 5 h. Compared to the pristine $TiO_2$, and to the 0.25 g, 0.75 g, and 1 g $g-C_3N_4/TiO_2$ films, the 0.5 g of $g-C_3N_4/TiO_2$ sample was coated with a thin $g-C_3N_4$ layer that caused separation of the electrons and the holes; this led to a decreasing recombination. This unique structure can be used in photoelectrochemical applications.
Kang, Suhee,Jang, Joonyoung,Ahn, Sung-hoon,Lee, Caroline Sunyong The Royal Society of Chemistry 2019 Dalton Transactions Vol.48 No.6
<P>Herein, we newly design a ternary structure of 1-dimensional hollow g-C3N4 nanofibers (HGCNF) decorated with molybdenum disulfide (MoS2) and sulfur/nitrogen-doped graphene (SNG) <I>via</I> a one-pot hydrothermal treatment at relatively low temperature. The firstly presented HGCNF are fabricated using electrospinning followed by the thermal sintering method. After that, MoS2 is grown onto HGCNF, while SNG covered the structures during the hydrothermal method. We observed the morphological structures, chemical composition and optical absorbance of this ternary HGCNF/SNG/MoS2 structure. Of the as-prepared catalysts, HGCNF/SNG/MoS2 exhibited a good possibility to produce hydrogen as an electrocatalyst. Furthermore, we evaluated its stability performance using chronoamperometry for 48 hours, as well as by 3000 cycles of cyclic voltammetry. From the double-layer capacitance measurement, HGCNF/SNG/MoS2 proved itself as an electrocatalyst due to the higher value of electrocatalytically active sites to be 6.97 × 10<SUP>−3</SUP> F cm<SUP>−2</SUP> than that of only HGCNF (0.18 × 10<SUP>−5</SUP> F cm<SUP>−2</SUP>) and the binary structure of HGCNF/MoS2 (2.54 × 10<SUP>−3</SUP> F cm<SUP>−2</SUP>). We believe that our novel 1-dimensional ternary HGCNF/SNG/MoS2 structure has expedited the electron pathways by reducing the resistance at interfaces among HGCNF, SNG and MoS2, to be potentially useful for the hydrogen evolution reaction.</P>
국내 송아지 분변 내 설사병 병원체 검출과 설사 발병율 조사
김수희 ( Suhee Kim ),강진희 ( Jin-hee Kang ),이창준 ( Chang-joon Lee ),이영성 ( Young-sung Lee ),채정병 ( Jeong-byoung Chae ),강성우 ( Sung-woo Kang ),정숙한 ( Suck-han Jeong ),유도현 ( Do-hyeon Yu ),조아라 ( Ara Jo ),류재규 ( Jae 한국동물위생학회 2016 한국동물위생학회지 (KOJVS) Vol.39 No.3
Diarrhea is reported as one of the most common diseases in calves. It is thought to be a major cause of productivity and economic loss to cattle producers. The aim of this study is to provide a better under-standing of well-known diarrheagenic pathogens and incidence of diarrhea in Korean calves. In this study, the relationship of calf diarrhea and pathogens were investigated from calves under 60 days of age in five areas of Korea from April to July, 2016. Of examined fecal samples, 38.3% was positive for any pathogens, and Giardia was the most common pathogen (25.5%). The incidence of diarrhea was 31% from pathogen-negative fecal samples whereas 61.1% from pathogen-positive fecal samples, sug-gesting high correlation between pathogenic factor and diarrhea. In addition, 80% of E. coli (K99) pos-itive calves showed diarrhea, suggesting E. coli (K99) could be highly pathogenic. The incidence of diarrhea and infection rate increased with age. Rotavirus was revealed as a major pathogen in calves under 20 days of age, and the infection rate of Giardia increased rapidly in calves 20 to 39 days of age. The information on interconnections between clinical diarrhea and pathogens would contribute to developing strategies for treatment of calf diarrhea.
강수희(Suhee kang),유희수(Heesu Yu),임진솔(Jinsol Lim),박주영(Juyoung Park),안효기(Hyogi Ahn),안희라(Christine Heera Ahn),신동혁(Dong Hyuk Shin) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
3D technologies have received much attention recently in various research area. Among them, 3D printer and 3D scanner are fast and easy techniques to manufacture its products in one simple process. Due to its several benefits, such as low cost fabrication and simple process, these technologies can manufacture products based on consumption or our needs. Here, our studies are focused on making customized mask for yellow dust using 3D printing and 3D scanning methods. Our goal is to design a process to manufacture functional mask for yellow dust using cost-effective 3D technologies. Using this 3D scanner, one’s face will be scanned so that this mask for yellow dust will be customized to fit one’s own face for complete protection from the dust. Moreover, it can be reusable with numerous washings since flexible and biocompatible filaments are used to fabricate masks where conventional masks are disposable, resulting in polluted waste. Mechanical properties as well as microstructure of this fabricated mask for yellow dust will be studied for reusability. Therefore, this 3D printing and 3D scanner can bring a new era in the health market.
Kang, Yeongkwon,Lee, Jihoon,Song, Suhee,Park, Seong Soo,Park, Sung Heum,Jin, Youngeup American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.8
<P>A series of fluorinated quinoxaline-based donor-acceptor alternating copolymers for application in bulk heterojunction polymer solar cells, P2TDFQx, P2TFQx, PTTDFQx, and PTTFQx, were designed and synthesized. The introduction of the electron-withdrawing fluorine atoms to the quinoxaline moiety lowers the highest occupied molecular orbital energy levels of the resulting polymers, which is beneficial for achieving high V-OC and long-term stability. The thermal decomposition temperatures (5% weight loss) of these polymers were over 390 degrees C, indicating excellent thermal stability. Films of these polymers showed broad absorption bands between 350 and 700 nm and low HOMO energy levels ranging from -5.25 to -5.47 eV. PTTDFQx had the highest efficiency in PSCs, with a V-OC of 0.70 V, a J(SC) of 5.51 mA/cm(2), and an FF of 0.40, resulting in a PCE of 1.53%.</P>
On the Use of Prediction Strategy in Korean EFL Learners’ Reading Comprehension
Suhee Cho,Yusun Kang 한국응용언어학회 2019 응용 언어학 Vol.35 No.1
Despite the widespread understanding about the facilitative role of strategy use in reading comprehension, there has been little research evidence regarding the potential contribution of the readers’ actual performance on a specific strategy, especially prediction strategies, to their reading comprehension. Moreover, although second/foreign language readers’ strategy use may be related to their reading abilities and language proficiency in the target language, not many studies have controlled for such effects in identifying the relationship between strategy uses and reading comprehension. Thus, this study aimed to investigate the relationship between the Korean middle school EFL learners’ actual use of prediction strategy and their reading comprehension. Furthermore, it examines whether such relationships may differ as a function of their English reading abilities and proficiency. One hundred thirty three Korean EFL middle school readers’ performance on the tests of English reading comprehension, prediction abilities, vocabulary and oral comprehension abilities was analyzed. The findings not only demonstrated the positive relations prediction strategy has with reading comprehension, but also identified different predictive roles it plays in the reading comprehension of good versus poor readers.