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Lee, Misun,Lee, Deok Yeon,Nah, Yoon-Chae,Lee, Joong Kee,Kim, Chang Sam,Lee, Wonjoo,Han, Sung-Hwan American Scientific Publishers 2012 Journal of nanoscience and nanotechnology Vol.12 No.5
<P>An acetylene polymer is formed on single-walled carbon nanotubes (SWNTs) using in situ polymerization. The acetylene polymers/SWNTs composite is hydrophilic even water-soluble, and has a structure of donor/acceptor dyad. In measurements of photocurrents-voltage curves, the composite film exhibits a power conversion efficiency of 1.50 x 10(-2%) under illumination (I = 80 mW/cm2, air mass 1.5 condition).</P>
Lee, Wonjoo,Baek, Su Jin,Min, Sun Ki,Cai, Gangri,Lee, Joong Ki,Cho, Byung Won,Lee, Soo-Hyoung,Han, Sung-Hwan American Scientific Publishers 2008 Journal of nanoscience and nanotechnology Vol.8 No.9
<P>Heterojunction of hydrophobic poly(1,4-phenylenevinylene) (PPV) on hydrophilic CdS nanoparticles was successfully prepared by the multi-layering of poly(<I>p</I>-xylene tetrahydrothiophenium chloride) (pre-PPV: precursor of PPV polymer) and poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) in an aqueous solution followed by a thermal treatment. CdS nanoparticles thin films were prepared on tin-doped indium oxide (ITO) by a chemical-bath-deposition method. The CdS surface was hydrophilic with low water contact angle of 15°. Positively charged and water-soluble pre-PPV was used to form multilayers with PEDOT:PSS by a layer-by-layer deposition method. Pre-PPV is easily converted to conjugated PPV polymer by a thermal treatment. The CdS nanoparticles-(PPV/PEDOT:PSS) multilayer films constitute efficient acceptor-sensitizer dyad systems, which generate a photocurrent of 2,660 nA/cm<SUP>2</SUP> under the air mass (AM) 1.5 conditions (<I>I</I> = 100 mW/cm<SUP>2</SUP>) for sample with 4.5 bilayers.</P>
Kim, Y S,Baek, Sujin,Lee, Wonjoo,Lee, Y,Han, Sung-Hwan,Lee, Changhee,Lee, Youn-Sik,Lee, Soo-Hyoung American Scientific Publishers 2009 Journal of nanoscience and nanotechnology Vol.9 No.12
<P>To improve the performance of organic solar cells, various methods have been used to increase the light absorbance and electron transfer efficiency or decrease the internal resistance of the device. In this article, red dyes of phosphorescent materials are used to improve the performance of bulk heterojunction organic solar cells based on MDMO-PPV and PCBM. Solar cell devices doped with different red dyes showed higher performances in terms of current, voltage and conversion efficiency than those without red dyes. The efficiency was maximized in the devices with a 10% concentration of red dye 2, which was attributed to the longer exciton lifetimes that were induced by the triplet spin state of the red dyes allowing them to reach the p-n junction and thereby generate more photocurrent.</P>
Lee, Wonjoo,Mini, Sun-Ki,Cai, Gangri,Hwang, Yunhee,Baek, Sujin,Cho, Byung Won,Lee, Soo-Hyoung,Han, Sung-Hwan American Scientific Publishers 2009 Journal of nanoscience and nanotechnology Vol.9 No.12
<P>This paper reports the use of Au nanoparticles (NPs) as electron transfer bridge layers to improve the photocurrent of viologen/Ru complex-based photoelectrochemical cells. The Ru complex/ viologen/Au NPs on electrodes were prepared using self-assembled monolayers. The cell system showed an excellent photocurrent of 25 nA/cm2 under the 1.5 air mass condition (I = 100 mW/cm2), which is five times greater than Au NPs due to the reduced recombination reaction.</P>
Lee, Kisu,Cho, Kyung Hee,Ryu, Jaehoon,Yun, Juyoung,Yu, Haejun,Lee, Jungsup,Na, Wonjoo,Jang, Jyongsik Elsevier 2017 ELECTROCHIMICA ACTA Vol.224 No.-
<P><B>Abstract</B></P> <P>A facile synthesis and modification method of polyaniline:poly(styrenesulfonate) (PANI:PSS) is reported for an efficient hole transport material (HTM) in inverted planar perovskite solar cells (PSCs). PANI:PSS with Triton X–100, a nonionic surfactant, showed enhanced hole transport capability due to improved wetting on the substrate and a surface compositional change. The surfactant lowered the surface tension of a PANI:PSS aqueous solution, which enabled uniform casting of PANI:PSS films onto an indium tin oxide (ITO) substrate without any surface treatment. Additionally, self-organization of PSS nanogranules, induced by the surfactant, provided PANI-rich surfaces that were favorable for hole extraction. When surfactant-modified PANI:PSS (1.0wt% Triton X–100) was used as an HTM in a PSC, the average short-circuit current density increased by 23% compared with pristine PANI:PSS (i.e., from 15.02 to 18.43mA/cm<SUP>2</SUP>) and the fill factor also improved, eventually leading to a power conversion efficiency enhancement from 6.59 to 10.90%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PANI:PSS modified with a nonionic surfactant (Triton X–100) was successfully utilized as a hole transport material for perovskite solar cells. </LI> <LI> Perovskite solar cells using PANI:PSS with the optimal Triton X–100 concentration exhibited a maximum power conversion efficiency of 11.67%. </LI> <LI> Triton X–100 played a bifunctional role to enhance the hole extraction capability of PANI:PSS. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Chu,Chun, Wonjoo,Zhao, Rongjie,Kim, Young Dae,Nam, Myung Mo,Jung, Dae Hwa,Cho, Il Je,Jegal, Kyung Hwan,Lee, Tae Hoon,Kim, Young Woo,Park, Sang Mi,Ju, Seong A.,Lee, Chul Won,Kim, Sang Chan,An, Won D.A. Spandidos 2017 Oncology letters Vol.14 No.2
<P><I>Patinopecten yessoensis</I>, is a species of scallop and a marine bivalve mollusk. In traditional East Asian medicine, scallop meat is used as a drug for the treatment of diabetes, pollakisuria, and indigestion. The present study was conducted in order to examine the potential anticancer effects of scallop flesh extract (SE) on MCF-7 human breast cancer cells. An MTT assay was used to evaluate cell viability and flow cytometry was used for the assessment of cell cycle distribution and apoptosis. The alteration in protein expression level was determined by western blot analysis, and the amounts of docosahexaenoic acid and eicosapentaenoic acid in the SE were measured by gas chromatography. SE inhibited the growth of MCF-7 human breast cancer cells in a dose-dependent manner by inducing G0/G1 phase arrest. The cell cycle arrest was associated with the upregulation of p53 and p21, and downregulation of G1 phase-associated cyclin D1/cyclin-dependent kinase (Cdk) 4 and cyclin E1/Cdk 2. In addition, SE-mediated cell cycle arrest was associated with the promotion of apoptosis, as indicated by the expression of apoptosis-associated proteins and changes in nuclear morphology. SE appeared to induce the mitochondrial apoptotic cascade, as indicated by a decreased expression of Bcl-2, activation of Bcl-2 associated X protein, release of cytochrome c, decrease in procaspase-3, and an increase in cleaved-poly (ADP-ribose) polymerase (PARP). Furthermore, the expression levels of Fas-associated via death domain and cleaved caspase-8 were increased in a SE dose-dependent manner. Taken together, these results suggest that the intrinsic and extrinsic pathways of apoptosis are associated with the anticancer effects of SE on MCF-7 cells. Thus, SE may be a suitable candidate for the treatment and prevention of human breast cancer.</P>
Effect of auxetic structures on crash behavior of cylindrical tube
Lee, Wonjoo,Jeong, Yuhyeong,Yoo, Jesung,Huh, Hoon,Park, Sung-Jun,Park, Sung Hyuk,Yoon, Jonghun Elsevier 2019 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.208 No.-
<P><B>Abstract</B></P> <P>This paper mainly concerns effects of the auxetic structure on the crash performances in terms of the axial crash force, specific energy absorption, and deceleration, which are evaluated with the conventional and honeycomb structures. Based on the systematic design procedure, the re-entrant units for the auxetic structure are regularly arranged in the tube wall, which are produced by the additive manufacturing with SUS316L metal powder. Under the low impact condition, the auxetic does not only exhibit higher specific energy absorption, but also demonstrate substantially low deceleration due to effect of the densification during the axial crash compared with the conventional tube. Furthermore, while the honeycomb tube demonstrates oscillating behavior in the deceleration, the auxetic tube tends to maintain steady deceleration after the first peak during the axial crash, which is able to guarantee enhanced damping performances under the low impact condition.</P>