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Self-healing graphene oxide-based composite for electromagnetic interference shielding
Sim, Hyeon Jun,Lee, Duck Weon,Kim, Hyunsoo,Jang, Yongwoo,Spinks, Geoffrey M.,Gambhir, Sanjeev,Officer, David L.,Wallace, Gordon G.,Kim, Seon Jeong Elsevier 2019 Carbon Vol.155 No.-
<P><B>Abstract</B></P> <P>The electromagnetic pollution issues have been arising from the fast-growing development for electronic devices. Hence, the demand for materials with high electromagnetic interference (EMI) shielding performance has increased. Here, we developed self-healable, flexible and printable graphene oxide/silver nanowire films and textiles with excellent EMI shielding performance. The maximum electromagnetic interference shielding effectiveness (EMI SE) of 92 dB was recorded for an 18 μm-thickness film. In addition, the specific EMI shielding effectiveness was 31 dB cm3/g or 48,275 dB cm2/g when normalized to film thickness. Both values are higher than reported EMI shielding products. The composite film and coated textile were tolerant of damage induced by cracking or scratching. Damaging the films by cracking reduced the electrical conductivity, mechanical properties, and the EMI SE was decreased from 72 dB to 56 dB at 8.2 GHz. After the healing process, the EMI SE was recovered to 71 dB and mechanical properties restored. The EMI SE of textile reached a maximum of 30 dB which is suitable to use as a commercial EMI shielding product. In addition, the textile exhibited high flexibility, and showed excellent mechanical stability with no change in performance after 1000 bending cycles.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이준범,Lee Byoung-hee,박정준,Hong Jeong In,Lee Dae-Weon 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
The tobacco whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae), is a serious pest that transmits tomato yellow leaf curl virus (TYLCV) in tomato. The tobacco whitefly exhibits morphological similarity with the greenhouse whitefly, Trialeurodes vaporariorum (Hemiptera: Aleyrodidae) which also damages various plants in the green house. Therefore, it is very important to quickly and accurately diagnose whiteflies for applying pest manage ment strategies. In this study, we used a loop-mediated isothermal amplification (LAMP) assay to quickly and effectively detect B. tabaci. Primer sets were investigated for the specificity of B. tabaci by visible detection of the target DNA fragment. Two primer sets for pheromone biosynthesis activating neuropeptide (PBAN) gene were obtained from transcriptomic analysis of B. tabaci biotype Q. The PBAN-based LAMP primer set showed specific amplification of the target region. The optimal conditions for B. tabaci detection were 60 ◦ C for 60 min with four LAMP primers of PBAN. The minimum amount of genomic DNA required for visible detection was 100 ng. These results suggest that the PBAN-based LAMP assay can be applicable for field monitoring of B. tabaci.
양자간섭소자를 위한 InGaAs/InGaAsP/InP 양자점 분자구조 연구
김진석,김은규,정원국,Kim Jin-Soak,Kim Eun-Kyu,Jeong Weon-G. 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.2
유기금속화학기상증착법으로 InGaAs/InGaAsP/InP 양자점 분자구조를 두 양자점 층간의 거리가 10 nm가 되도록 성장하여 성장된 구조에 대해 C-V, DLTS 및 PL 등의 전기 광학적 물성측정을 하였다. 그 결과 큰 양자점은 작은 양자점과 비교하여 장벽물질의 전도대역 가장자리로부터 먼 쪽에 에너지 준위가 형성되어 있음을 확인하였다. 큰 쪽 양자점에는 최소한 2개 이상의 에너지 준위에 운반자를 포획시킬 수 있음이 확인되었는데, -4 V의 역전압 하에서 측정된 양자점 분자구조의 에너지 준위는 장벽 가장자리로부터 0.35, 0.42, 0.45 eV 의 깊이에 각각 존재하였다. 인가된 전압의 변화에 대하여 약한 전기장 하에서는 양자점 분자구조의 에너지 준위들이 서로 결합되어 있다가 전기장이 증가하면서 이들 두 에너지 준위가 확연히 분리되는 모습을 확인할 수 있었다. In this study, we analyzed the electrical and optical properties of metalorganic chemical vapor deposition grown InGaAs/InGaAsP/InP quantum dot(QD) molecules by using photoluminescence and deep-level transient spectroscopy. From these resulte, the energy levels of the large QDs are located at deeper region from the conduction band edge of the barrier than that of the small QDs, The large QDs seem to have the energy states more than two, and these energy levels of the QD molecules are located at 0.35, 0.42, and 0.45 eV from conduction band edge under -4 V reverse bias conditions. The energy levels are closely coupled under low reverse bias, and then decoupled as the bias voltage is increased.
Borondifluoride complexes of hemicurcuminoids as bio-inspired push–pull dyes for bioimaging
Kim, Eunsun,Felouat, Abdellah,Zaborova, Elena,Ribierre, Jean-Charles,Wu, Jeong Weon,Senatore, Sé,bastien,Matthews, Cé,dric,Lenne, Pierre-Franç,ois,Baffert, Carole,Karapetyan, Artak,G The Royal Society of Chemistry 2016 Organic & Biomolecular Chemistry Vol.14 No.4
<P>Hemicurcuminoids are based on half of the pi-conjugated backbone of curcuminoids. The synthesis of a series of such systems and their borondifluoride complexes is described. The electrochemical and photophysical properties of difluorodioxaborine species were investigated as a function of the nature of electron donor and acceptor groups appended at either terminal positions of the molecular backbone. The emissive character of these dipolar dyes was attributed to an intraligand charge transfer process, leading to fluorescence emission that is strongly dependent on solvent polarity. Quasi-quantitative quenching of fluorescence in high polarity solvents was attributed to photoinduced electron transfer. These dyes were shown to behave as versatile fluorophores. Indeed, they display efficient two-photon excited fluorescence emission leading to high two-photon brightness values. Furthermore, they form nanoparticles in water whose fluorescence emission quantum yield is less than that of the dye in solution, owing to aggregation-induced fluorescence quenching. When cos7 living cells were exposed to these weakly-emitting nanoparticles, one-and two-photon excited fluorescence spectra showed a strong emission within the cytoplasm that originated from the individual molecules. Dye uptake thus involved a disaggregation mechanism at the cell membrane which restored fluorescence emission. This off-on fluorescence switching allows a selective optical monitoring of those molecules that do enter the cell, which offers improved sensitivity and selectivity of detection for bioimaging purposes.</P>
Optical Characteristics of InGaNAs Quantum Wells Grown by MOCVD
남제 김,D. Lee,J. W. Jang,K. H. Park,Weon. G. Jeong,장유동 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
Effects of nitrogen incorporation into InGaAs quantum wells are investigated. We have found that In$_{0.34}$Ga$_{0.66}$NAs/GaAs quantum wells can have a better material quality than In$_{0.34}$Ga$_{0.66}$As/GaAs quantum wells, since the relaxed strain in the In$_{0.34}$Ga$_{0.66}$As/GaAs quantum wells is recovered, due to the reduced lattice constant, with a small addition of nitrogen into the In$_{0.34}$Ga$_{0.66}$As layer. This is interpreted by the fact that the splitting between the heavy hole and light hole energy levels depends mostly on the exercised strain. Effects of nitrogen incorporation into InGaAs quantum wells are investigated. We have found that In$_{0.34}$Ga$_{0.66}$NAs/GaAs quantum wells can have a better material quality than In$_{0.34}$Ga$_{0.66}$As/GaAs quantum wells, since the relaxed strain in the In$_{0.34}$Ga$_{0.66}$As/GaAs quantum wells is recovered, due to the reduced lattice constant, with a small addition of nitrogen into the In$_{0.34}$Ga$_{0.66}$As layer. This is interpreted by the fact that the splitting between the heavy hole and light hole energy levels depends mostly on the exercised strain.