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Jeon, Dasom,Kim, Hyunwoo,Lee, Cheolmin,Han, Yujin,Gu, Minsu,Kim, Byeong-Su,Ryu, Jungki American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.46
<P>Artificial photosynthesis is considered one of the most promising solutions to modem energy and environmental crises. Considering that it is enabled by multiple components through a series of photoelectrochemical processes, the key to successful development of a photosynthetic device depends not only on the development of novel individual components but also on the rational design of an integrated photosynthetic device assembled from them. However, most studies have been dedicated to the development of individual components due to the lack of a general and simple method for the construction of the integrated device. In the present study, we report a versatile and simple method to prepare an efficient and stable photoelectrochemical device via controlled assembly and integration of functional components on the nanoscale using the layer by -layer (LbL) assembly technique. As a proof of concept, we could successfully build a photoanode for solar water oxidation by depositing a thin film of diverse cationic polyelectrolytes and anionic polyoxometalate (molecular metal oxide) water oxidation catalysts on the surface of various photoelectrode materials (e.g., Fe2O3, BiVO4, and TiO2). It was found that the performance of photoanodes was significantly improved after the deposition in terms of stability as well as photocatalytic properties, regardless of types of photoelectrodes and polyelectrolytes employed. Considering the simplicity and versatile nature of LbL assembly techniques, our approach can contribute to the realization of artificial photosynthesis by enabling the design of novel photosynthetic devices.</P>
Structure-Activity Relationship of the N-terminal Helix Analog of Papiliocin, PapN
Jeon, Dasom,Jeong, Min-Cheol,Kim, Jin-Kyoung,Jeong, Ki-Woong,Ko, Yoon-Joo,Kim, Yangmee Korean Magnetic Resonance Society 2015 Journal of the Korean Magnetic Resonance Society Vol.19 No.2
Papiliocin, from the swallowtail butterfly, Papilio xuthus, shows high bacterial cell selectivity against Gram-negative bacteria. Recently, we designed a 22mer analog with N-terminal helix from $Lys^3$ to $Ala^{22}$, PapN. It shows outstanding antimicrobial activity against Gram-negative bacteria with low toxicity against mammalian cells. In this study, we determined the 3-D structure of PapN in 300 mM DPC micelle using NMR spectroscopy and investigated the interactions between PapN and DPC micelles. The results showed that PapN has an amphipathic ${\alpha}$-helical structure from $Lys^3$ to $Lys^{21}$. STD-NMR and DOSY experiment showed that this helix is important in binding to the bacterial cell membrane. Furthermore, we tested antibacterial activities of PapN in the presence of salt for therapeutic application. PapN was calcium- and magnesium-resistant in a physiological condition, especially against Gram-negative bacteria, implying that it can be a potent candidate as peptide antibiotics.
Jeon, Seolhee,Thakur, Ujwal Kumar,Lee, Daehee,Wenping, Yin,Kim, Dasom,Lee, Sunjong,Ahn, Tae Kyu,Park, Hui Joon,Kim, Bong-Gi Elsevier 2016 ORGANIC ELECTRONICS Vol.37 No.-
<P><B>Abstract</B></P> <P>Novel conjugated materials, DPIO and DPIE, having same molecular configuration of both an electron donating <I>N</I>-phenylindole and an electron accepting diketopyrrolopyrrole derivative, exhibited different aggregation behavior because of the applied side chains. When DPIO and DPIE were applied to as hole transporting materials in perovskite solar cell, DPIO showed better device performance than ones with DPIE, mostly due to the aggregation-assisted enhanced electrical property. DPIO effectively extracted hole from the perovskite layer, providing over 10% PCE of cell efficiency without any chemical doping. Incident-photon-to-electron conversion efficiency (IPCE) measurement confirmed that DPIO’s strong absorption in the longer wavelength region partly contributed to the light harvesting of the solar cell device. In addition, time-resolved photoluminescence (TRPL) and transient photovoltage (TPV) studies proved that the DPIO-based device, compared to the conventional Spiro-MeOTAD-based device, has better charge extraction ability and reduced charge recombination.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Side chains provide different aggregation behaviors in organic semiconductors. </LI> <LI> Electrical property of organic semiconductors is affected by molecular aggregation. </LI> <LI> Molecular aggregation strongly affects the device performance of perovskite solar cells. </LI> <LI> Organic semiconductors showing high aggregation behavior would be advantageous for dopant-free hole transporting material. </LI> <LI> Organic dipolar semiconductors could reduce the degree of charge recombination. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>