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Viet, Vu Quoc,Adeyemi, Salawu Yusuff,Son, Won Huyk,Rhyee, Jong-Soo,Lee, Nam-Suk,Kim, Heon-Jung American Chemical Society 2018 Crystal Growth & Design Vol.18 No.6
<P>This study examined the phase competition and critical thickness of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> in epitaxial ε-Fe<SUB>2</SUB>O<SUB>3</SUB> thin films grown on a (100)-oriented yttrium-stabilized zirconia (YSZ) substrate using a pulsed laser deposition technique. The maximum critical thickness was found to be ∼20 nm for a single phase of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> at the optimal laser spot size without impurities. Above this critical thickness, (00l)-oriented α-Fe<SUB>2</SUB>O<SUB>3</SUB> begins to appear along with ε-Fe<SUB>2</SUB>O<SUB>3</SUB>, eventually dominating in the thicker samples. These results suggest that the stability of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> films are influenced by the appearance of a specific domain pattern, which becomes a favorable nucleation site for α-Fe<SUB>2</SUB>O<SUB>3</SUB>. The ε-Fe<SUB>2</SUB>O<SUB>3</SUB> films grown on the YSZ (100) substrate have a larger saturation moment than ε-Fe<SUB>2</SUB>O<SUB>3</SUB> grown on SrTiO<SUB>3</SUB> (111), and its coercive field approaches 1/4 of the maximum coercive field of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> nanoparticles.</P><P>Plane view of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> and α-Fe<SUB>2</SUB>O<SUB>3</SUB> unit cells on a YSZ (001) substrate oriented along the <I>c</I>-direction. Edge structure of two ε-Fe<SUB>2</SUB>O<SUB>3</SUB> domains sharing a horizontal line is a possible nucleation site for α-Fe<SUB>2</SUB>O<SUB>3</SUB>. Formation of this structure limits stable growth of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> on the YSZ (001)</P> [FIG OMISSION]</BR>
Vu Quoc VIET,민병준,김헌정 한국물리학회 2017 새물리 Vol.67 No.6
The La$_{1-x}$Pr$_x$NiO$_3$ (LPNO) films were grown on SrTiO$_3$ (STO) substrates via the pulsed laser deposition (PLD) method. The influence of the concentration x on the microstructure and the electrical properties of the LPNO films was investigated. The LPNO films with different concentrations x from 0 to 0.3 were fabricated under an oxygen partial pressure of 100 mTorr at a substrate temperature of 750 $^{\circ}$C and an energy density of 1.0 J/cm$^2$. The textures, morphologies and electrical properties of the LPNO films were characterized by using X-ray diffraction, atomic force microscopy (AFM), and electrical resistivity measurements. The LPNO films were shown to be c-axis oriented, and the LPNO films with x = 0.2 and 0.3 exhibited an upturns at T = 40 K and 50 K, respectively.
High-Frequency Interdigitated Array Electrode-Based Capacitive Biosensor for Protein Detection
Tuan Vu Quoc,Viet Nguyen Ngoc,Tung Thanh Bui,Chun-Ping Jen,Trinh Chu Duc 한국바이오칩학회 2019 BioChip Journal Vol.13 No.4
This paper reports a study on developing of a protein detection biochip based on interdigitated array electrodes (IDAEs) capacitive immunosensor. The protein after being preconcentrated in a detection region will be selectively captured and detected by the capacitive immunosensor. Using electrical impedance spectroscopy operated at high-frequency in the range of 100 kHz–1 MHz, the capacitance of the gold electrode is determined and the antibody surface modification steps can be also monitored. The experiment results show the capacitance changes in accordance with the adding biochemical layer on gold electrodes for each step of the antibody surface modification. In particular, the total impedance operated at 1 MHz frequency has been seen to change from 2.1 kΩ of bare chip (before antibody surface modification) to 8 kΩ after antibody surface modification process while the serial capacitance is recorded to reduce steadily from 450 pF to 55 pF. Also, the efficiency of protein chip was investigated by implementing the measurement of 10 µM BSA with and without preconcentration process. The measurement results have shown the sensitivity increasing significantly after the protein is preconcentrated in this chip. The results demonstrate high efficiency of protein detection can be achieved by operating high frequency capacitive measurement on IDAEs capacitive immunosensor.
Coaxial Fiber Supercapacitor Using All-Carbon Material Electrodes
Le, Viet Thong,Kim, Heetae,Ghosh, Arunabha,Kim, Jaesu,Chang, Jian,Vu, Quoc An,Pham, Duy Tho,Lee, Ju-Hyuck,Kim, Sang-Woo,Lee, Young Hee American Chemical Society 2013 ACS NANO Vol.7 No.7
<P>We report a coaxial fiber supercapacitor, which consists of carbon microfiber bundles coated with multiwalled carbon nanotubes as a core electrode and carbon nanofiber paper as an outer electrode. The ratio of electrode volumes was determined by a half-cell test of each electrode. The capacitance reached 6.3 mF cm<SUP>–1</SUP> (86.8 mF cm<SUP>–2</SUP>) at a core electrode diameter of 230 μm and the measured energy density was 0.7 μWh cm<SUP>–1</SUP> (9.8 μWh cm<SUP>–2</SUP>) at a power density of 13.7 μW cm<SUP>–1</SUP> (189.4 μW cm<SUP>–2</SUP>), which were much higher than the previous reports. The change in the cyclic voltammetry characteristics was negligible at 180° bending, with excellent cycling performance. The high capacitance, high energy density, and power density of the coaxial fiber supercapacitor are attributed to not only high effective surface area due to its coaxial structure and bundle of the core electrode, but also all-carbon materials electrodes which have high conductivity. Our coaxial fiber supercapacitor can promote the development of textile electronics in near future.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-7/nn4016345/production/images/medium/nn-2013-016345_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4016345'>ACS Electronic Supporting Info</A></P>
Hoang, Quoc Viet,Rasool, Shafket,Oh, Sora,Van Vu, Doan,Kim, Da Hun,Lee, Hang Ken,Song, Chang Eun,Lee, Sang Kyu,Lee, Jong-Cheol,Moon, Sang-Jin,Shin, Won Suk Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.31
<▼1><P>A newly synthesized small molecule donor, BDTT-2DPPBFu, is designed for incorporation into the photo-active layer in solution-processed small molecule organic photovoltaics (SM-OPVs).</P></▼1><▼2><P>A newly synthesized small molecule donor, BDTT-2DPPBFu, is designed for incorporation into the photo-active layer in solution-processed small molecule organic photovoltaics (SM-OPVs). The effects of a solvent additive (1-chloronaphthalene, CN) on the bulk heterojunction morphology of a BDTT-2DPPBFu donor:fullerene derivative acceptor (PC71BM) are investigated and correlated with the device performance. A TEM analysis revealed that the nanomorphology of the SM-OPVs evolved dramatically with increasing solvent additive volume. With an optimum concentration of 2.5 vol% CN, a nanomorphology with a fibrillar and interpenetrating network on the order of exciton diffusion length (∼10–15 nm) is formed, resulting in improvement of the short-circuit current density, fill factor, and power conversion efficiency. Further GIWAXS studies have shown that the π–π stacking distance of BDTT-2DPPBFu small molecules is reduced and the inter-mixing of PC71BM within the BDTT-2DPPBFu-rich phase in the photo-active layer processed from 2.5 vol% CN is increased, leading to enhanced charge transport and reduced charge recombination and transfer resistance. The present work provides important progress in the nanomorphology of the photo-active layer, which can be effectively tuned <I>via</I> the use of a solvent additive in SM-OPVs.</P></▼2>
Fuzzy analysis for stability of steel frame with fixity factor modeled as triangular fuzzy number
Tran, Thanh Viet,Vu, Quoc Anh,Le, Xuan Huynh Techno-Press 2017 Advances in computational design Vol.2 No.1
This study presents algorithms for determining the fuzzy critical loads of planar steel frame structures with fixity factors of beam - column and column - base connections are modeled as triangular fuzzy numbers. The finite element method with linear elastic semi-rigid connection and Response Surface Method (RSM) in mathematical statistic are applied for problems with symmetric triangular fuzzy numbers. The ${\alpha}$ - level optimization using the Differential Evolution (DE) involving integrated finite element modeling is proposed to apply for problems with any triangular fuzzy numbers. The advantage of the proposed methodologies is demonstrated through some example problems relating to for the twenty - story, four - bay planar steel frames.
곤충 모방 날갯짓 비행체의 안정적인 수직 이륙 비행 구현
판호앙부(Hoang-Vu Phan),트롱쾅트리(Quang-Tri Truong),구옌쿠옥비엣(Quoc-Viet Nguyen),박훈철(Hoon Cheol Park),변도영(Doyoung Byun),구남서(Nam Seo Goo) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.2
This paper demonstrates how to implement inherent pitching stability in an insect-mimicking flapping-wing system for vertical takeoff. Design and fabrication of the insect-mimicking flapping-wing system is briefly described focusing on the recent modification. Force produced by the flapping-wing systems is estimated using the UBET (Unsteady Blade Element Theory) developed in the previous work. The estimation shows that the wing twist placed in the modified system can improve thrust production for about 10 %. The estimated thrust is compared with the measured thrust, which proves that the UBET provides fairly good estimations for the thrust produced by the flapping-wing systems. The vertical takeoff test shows that inherent pitching stability can be implemented in an insect-mimicking flapping-wing system by aligning the aerodynamic force center and center of gravity.
Thanh-Tung Duong,Ta Quoc Tuan,Dang Viet Anh Dung,Nguyen Van Quy,Dinh-Lam Vu,Man Hoai Nam,Nguyen Duc Chien,윤순길,Anh-Tuan Le 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Polyaniline nanowires (PANI NWs) were deposited onto fluorine-doped tin oxide (FTO) glass substrate using the cyclic voltammetric method with aniline monomer precursor in HCl aqueous solution. The secondary oxidation peak plays an important role in polymerization of aniline monomer and the optimization of catalytic activity of PANI-based counter electrodes was achieved by controlling the number of cycles. The photovoltaic performance of the dye-sensitized solar cells (DSSCs) with PANI NWs counter electrodes (CEs) was optimized at 4th cycles, and then following parameters were obtained: Jsc ¼ 17.2 mA cm2, Voc ¼ 0.71 V, FF ¼ 59.3%, and efficiency (h) ¼ 7.24%. While, Jsc ¼ 14.7 mA cm2, Voc ¼ 0.77 V, FF ¼ 70.6%, and efficiency (h) ¼ 7.98% in cells with Pt CEs. The PANI NWs were attractive as an alternative CEs for the low-cost DSSCs instead of Pt.