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Soeun Shin,Sun Ran Cho,Hyun Kyung Kim,Hyun-Na Koo,Gil-Hah Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
The green peach aphid, Myzus persicae Sülzer, is an important sap-sucking pest of many plants, including Chinese cabbage. The objective of this study was therefore (1) to determine the effects of sublethal concentrations of afidopyropen, sulfoxaflor, and spirotetramat on adult longevity and the fecundity of M. persicae, and (2) to study the feeding behavior of M. persicae on Chinese cabbage leaves treated with various concentrations of these three insecticides. Longevity and total fecundity of M. persicae adults were decreased at concentrations higher than LC30. Feeding behavior analyses using an electrical penetration graph showed that sublethal concentrations of afidopyropen, sulfoxaflor, and spirotetramat had significant effects on the duration of phloem ingestion.
Soeun Shin,Sun Ran Cho,Hyun Kyung Kim,Hyun-Na Koo,Gil-Hah Kim 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Whitefly (Hemiptera: Aleyrodidae) pests, including the sweetpotato whitefly, Bemisia tabaci, and the greenhouse whitefly, Trialeurodes vaporariorum, are economically important in agriculture. With the annual growth of the domestic fresh fruit export market, various quarantine treatment methods are being used to export strawberries of better quality. The purpose of the present study was to investigate the effect of ionizing radiations (electron beam, X-ray, gamma-ray) on the development and reproduction of two species of whitefly and to determine the optimal dose of three ionizing radiations for the construction of quarantine technology applicable to strawberry export.
Striped fullerene patterns constructed in elastically anisotropic cholesteric liquid crystals
Kim, Soeun,Kang, Shin-Woong,Jeong, Kwang-Un The Royal Society of Chemistry 2012 Soft matter Vol.8 No.38
<P>A fullerene-based reactive molecule (C60RM) was newly synthesized. Its chemical structure and phase behaviour were investigated using spectroscopic, scattering and microscopic techniques. Furthermore, the striped C60RM pattern was successfully fabricated in an elastically anisotropic cholesteric liquid crystal (CLC).</P> <P>Graphic Abstract</P><P>Striped fullerene patterns were successfully fabricated in an elastically anisotropic cholesteric LC medium. This unique templating effect for constructing the macroscopic patterns with nano-building blocks can open new doors for the next generation of nanotechnology. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2sm26420j'> </P>
Improved Stability of Interfacial Energy-Level Alignment in Inverted Planar Perovskite Solar Cells
Im, Soeun,Kim, Wanjung,Cho, Wonseok,Shin, Dongguen,Chun, Do Hyung,Rhee, Ryan,Kim, Jung Kyu,Yi, Yeonjin,Park, Jong Hyeok,Kim, Jung Hyun American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.22
<P>Even though poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been commonly used as a hole extraction layer (HEL) for p-i-n perovskite solar cells (PSCs), the cells’ photovoltaic performance deteriorates because of the low and unstable work functions (WFs) of PEDOT:PSS versus those of a perovskite layer. To overcome this drawback, we synthesized a copolymer (P(SS-<I>co</I>-TFPMA)) ionomer consisting of PSS and tetrafluoropropylmethacrylate (TFPMA) as an alternative to conventional PEDOT:PSS. The PEDOT:P(SS-<I>co</I>-TFPMA) copolymer solution and its film exhibited excellent homogeneity and high phase stability compared with a physical mixture of TFPMA with PEDOT:PSS solution. During spin coating, a self-organized conducting PEDOT:P(SS-<I>co</I>-TFPMA) HEL evolved and the topmost PEDOT:P(SS-<I>co</I>-TFPMA) film showed a hydrophobic surface with a higher WF compared to that of the pristine PEDOT:PSS film because of its chemically bonded electron-withdrawing fluorinated functional groups. Interestingly, the WF of the conventional PEDOT:PSS film dramatically deteriorated after being coated with a perovskite layer, whereas the PEDOT:P(SS-<I>co</I>-TFPMA) film represented a relatively small influence. Because of the superior energy-level alignment between the HEL and a perovskite layer even after the contact, the open-circuit voltage, short-circuit current, and fill factor of the inverted planar p-i-n PSCs (IP-PSCs) with PEDOT:P(SS-<I>co</I>-TFPMA) were improved from 0.92 to 0.98 V, 18.96 to 19.66 mA/cm<SUP>2</SUP>, and 78.96 to 82.43%, respectively, resulting in a 15% improvement in the power conversion efficiency vs that of IP-PSCs with conventional PEDOT:PSS. Moreover, the IP-PSCs with PEDOT:P(SS-<I>co</I>-TFPMA) layer showed not only improved photovoltaic performance but also enhanced device stability due to hydrophobic surface of PEDOT:P(SS-<I>co</I>-TFPMA) film.</P> [FIG OMISSION]</BR>