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Piezoelectric Materials: All‐Solution‐Processed Flexible Thin Film Piezoelectric nanogenerator (Adv. Mater. 45/2012)

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Advanced Materials 2012年第45期24卷

作者： Sung Yun Chung Sunyoung Kim Ju‐Hyuck Lee Kyongjun Kim Sang‐Woo Kim Chong‐Yun Kang Seok‐Jin Yoon Youn Sang Kim Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Seoul 151‐744 Republic of Korea SKKU Advanced Institute of Nanotechnology School of Advanced Materials Science and Engineering Sungkyunkwan University (SKKU) Suwon 440‐746 Republic of Korea Electronic Materials Center Korea Institute of Science and Technology Seoul 136‐791 Republic of Korea Advanced Institutes of Convergence Technology 864‐1 Iui‐dong Yeongtong‐gu Suwon‐si Gyeonggi‐do 443‐270 Republic of Korea

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Group III nitrides grown on 4H-SiC (3038) substrate by metal-organic vapor phase epitaxy

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MRS Online Proceedings Library (OPL) 2011年第1期831卷 E11.31-E11.31页

作者： Akira Honshio Tsukasa Kitano Masataka Imura Yasuto Miyake Hideki Kasugai Kazuyoshi Iida Takeshi Kawashima Motoaki Iwaya Satoshi Kamiyama Hiroshi Amano Faculty of Science and Technology 21st-Century COE Program “Nano-Factory” Meijo University 1–501 Shiogamaguchi Tempaku-ku Nagoya 468–8502 Japan.

The heteroepitaxial growth of a GaN single crystal by metal-organic vapor phase epitaxy on a 4H-SiC (3038) substrate was demonstrated. The crystallographic orientation of GaN was found to be dependent on growth pressure. When the growth pressure was 1000 hPa, the orientation of the GaN single crystal was consistent with that of the SiC substrate, where the c-plane of the GaN was single crystal tilted 54.7° from the surface plane. Then, we fabricated a violet-light-emitting diode (LED) with a GaInN multiple-quantum-well (QW) active layer grown on the GaN layer, which coherently grew on the 4H-SiC (3038 ) substrate. The blue shift of the peak wavelength with increasing injection current of up to 100 mA was confirmed to be two times smaller than that of a conventional LED on a c-plane sapphire substrate due to a low internal polarization.

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Impurity Effect on Weak Antilocalization in the Topological Insulator Bi2Te3

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Physical Review Letters 2011年第16期106卷 166805-166805页

作者： Hong-Tao He Gan Wang Tao Zhang Iam-Keong Sou George K. L Wong Jian-Nong Wang Hai-Zhou Lu Shun-Qing Shen Fu-Chun Zhang Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong China Nano Science and Technology Program The Hong Kong University of Science and Technology Clear Water Bay Hong Kong China Department of Physics and Center for Theoretical and Computational Physics The University of Hong Kong Pokfulam Road Hong Kong China

We study the weak antilocalization (WAL) effect in topological insulator Bi2Te3 thin films at low temperatures. The two-dimensional WAL effect associated with surface carriers is revealed in the tilted magnetic field dependence of magnetoconductance. Our data demonstrate that the observed WAL is robust against deposition of nonmagnetic Au impurities on the surface of the thin films, but it is quenched by the deposition of magnetic Fe impurities which destroy the π Berry phase of the topological surface states. The magnetoconductance data of a 5 nm Bi2Te3 film suggests that a crossover from symplectic to unitary classes is observed with the deposition of Fe impurities.

关键词： Deposition

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Development of an adaptive observer algorithm using RMS signal

Development of an adaptive observer algorithm using RMS sign...

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IEEE Symposium on Computational Intelligence in Control and Automation, CICA

作者： Byeong-kwan So Jung-han Kim Department of Nano & IT Fusion Program Seoul National University of Science and Technology Seoul South Korea Department of Mechanical Design & Automation Engineering Seoul National University of Science and Technology Seoul South Korea

Because of recent progress of nano positioning technology, the feature of low vibration in controlling a stage has received great attention. In lithography process, the stage hunting directly affects the performance of the manufactured product. The stage perturbation results from various noise sources, and actually the statistical characteristics of the noises easily changes. This paper focused on the design of a novel state observer which filters out the random noises that cause stage vibration, and simultaneously maintains fast detection against external disturbances. The proposed algorithm was designed to use the RMS signal in the feedback loop of the position controller, and it continually measures the level of noises and adjusts the statistical parameters in the digital Kalman filter. The RMS signal is measured by a RMS convertor chip for fast filter performance, and an air levitated precision stage with linear voice coil motor (LVCM) was used for the experiment. The results show that the performance of the system is effectively improved by the proposed observer algorithm with a conventional PID controller.

关键词： Noise Noise measurement Observers Kalman filters Sensors Semiconductor device measurement Simulation

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Algorithm for finding the moving direction of a vehicle using magnetic sensor

Algorithm for finding the moving direction of a vehicle usin...

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IEEE Symposium on Computational Intelligence in Control and Automation, CICA

作者： Bong-gu Lee Jung-han Kim Department of Nano & IT Fusion Program Seoul National University of Science and Technology Seoul South Korea Department of Mechanical Design & Automation Engineering Seoul National University of Science and Technology Seoul South Korea

To improve the efficiency of the intelligent transportation system, the study on the detection of speed and moving direction of a vehicle has been researched recently. Conventional method to detect the moving direction of a vehicle is to use two separate sensor units under vehicle road, which results in expensive cost and long installation time. In this research, a novel method of detecting the moving direction of a vehicle using only one sensor unit is proposed. The newest magnetic sensor is multi-axis detectable and occupies very small space. The proposed detection scheme uses a 2-axis magnetic sensor, low cost microcontroller, and signal processing technique. The designed sensor for detection of the direction of a vehicle is easy to install and less expensive than other type sensor. Experimental results showed that the proposed algorithm sensor was very effective and reliable.

关键词： Vehicles Magnetic sensors Roads Magnetic fields Shafts Resistance Iron

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Immobilization of aptamer-based molecular beacons onto optically-encoded micro-sized beads

Immobilization of aptamer-based molecular beacons onto optic...

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作者： Jun, Bong-Hyun Kim, Ji-Eun Rho, Chul Byun, Jang-Woong Kim, Yo Han Kang, Homan Kim, Jong-Ho Kang, Taegyu Cho, Myung-Haing Lee, Yoon-Sik School of Chemical and Biological Engineering Seoul National University Seoul 151-747 Korea Republic of Nano Systems Institute and Interdisciplinary Program in Nano-Science and Technology Seoul National University Seoul 151-747 Korea Republic of BeadTech Inc. Institute for Chemical Processes Seoul National University Seoul 151-744 Korea Republic of College of Veterinary Medicine Seoul National University Seoul 151-742 Korea Republic of

This paper presents a method for the novel immobilization of aptamer-based molecular beacons (apta-beacons) onto optically-encoded micro-sized beads (apta-beacon beads). To immobilize apta-beacons onto flourescently-encoded micro-sized beads, core8-shell type beads containing a fluorescent dye-encoded core and apta beacon-coupled shell were prepared. The fluorescent dye-encoded beads were prepared from TentaGel resins by coupling RITC to the amino groups of the core region, after partial protection of amino groups with Fmoc-OSu in a diffusion-controlled manner. After deprotection of the Fmoc-amino groups, FITC-coupled molecular beacons (MBs) were immobilized to the beads together with a quencher by covelent bonding. Briefly, aspartic acid (Asp) was coupled to the shell part of the beads. Then, the quencher was coupled to the N-terminal amino group of Asp and the MBs were coupled to the side chain carboxyl group. In a model study, thrombin was directly detected using this apta-beacon bead method. The thrombin-bound apta-beacon beads were easily recognized by the appearance of fluorescence without any further labeling step. Copyright © 2011 American Scientific Publishers All rights reserved.

关键词： Fluorescence

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Synthesis and raman response of multiwalled-carbon nanotubes decorated with gold nanobowls prepared via galvanic replacement of silver nanoparticles

Synthesis and raman response of multiwalled-carbon nanotubes...

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IEEE International Conference on nano/Micro Engineered and Molecular Systems (NEMS)

作者： Judy M. Obliosca Pen-Cheng Wang Fan-Gang Tseng Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Nano Science and Technology Taiwan International Graduate Program Institute of Physics Academia Sinica Taipei Taiwan

Gold nanobowls (AuNBs) of ~5 nm in diameter grown on multiwalled carbon nanotubes (MWCNT) were successfully synthesized via galvanic replacement of silver nanoparticles (AgNPs). A 3-fold Raman signal enhancement of MWCNT was observed when Au replacement with Ag approached to completion. Moreover, AuNBs can be readily released from CNT surface via sonication with 1-octanethiol (OT). Our current method demonstrates a novel technique on producing smallest dimension of AuNBs so far simply achieved in wet chemical process.

关键词： Gold Raman scattering Carbon nanotubes Silver nanoparticles nanobioscience Surface treatment

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Base effects on fabrication of silver nanoparticles embedded silica nanocomposite for surface-enhanced raman scattering (sers)

Base effects on fabrication of silver nanoparticles embedded...

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作者： Kang, Homan Kang, Taegyu Kim, Seongyong Kim, Jong-Ho Jun, Bong-Hyun Chae, Jinjoo Park, Juyoung Jeong, Dae-Hong Lee, Yoon-Sik Interdisciplinary Program in Nano-Science and Technology Seoul National University Seoul 151-744 Korea Republic of School of Chemical and Biological Engineering Seoul National University Seoul 151-744 Korea Republic of Department of Chemistry Education Seoul National University Seoul 151-744 Korea Republic of Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States

In this paper, we studied on the effect of organic bases in the case of ethylene glycol based fabrication of silver nanoparticles embedded silica nanocomposite (Ag SNC) without heating. Considering their chemical structures, butylamine (BA), ethanolamine (EA), triethanolamine (TEA), tributylamine (TBA), octylamine (OA) and Jeffamine 500 (JA) were used as an organic base. In addition, the effect of the concentrations of AgNO3 and organic bases on the formation of Ag SNC was also examined. In conformity with the characteristics of Ag SNC, SERS signal intensity of benzenethiol on Ag SNC was measured. As a result, the SERS signal intensity of Ag SNCs was strongly dependent on the reaction conditions. Furthermore, when reacted under the best reaction condition with concentrations of AgNO3 and OA, 3 mM and 5 mM, respectively, a large-scale production of Ag SNC was possible under the mild conditions. Copyright © 2011 American Scientific Publishers All rights reserved.

关键词： Silver nanoparticles

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Linear and nonlinear Fano resonance on two-dimensional magnetic metamaterials

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Physical Review B 2011年第23期84卷 235437-235437页

作者： H. Liu G. X. Li K. F. Li S. M. Chen S. N. Zhu C. T. Chan K. W. Cheah Department of Physics Hong Kong Baptist University Hong Kong China Department of Physics National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 China Department of Physics and Nano Science and Technology Program Hong Kong University of Science and Technology Clearwater Bay Hong Kong China

We demonstrate that both linear and nonlinear Fano resonances can be realized on two dimensional magnetic metamaterials. The Fano resonance comes from the interference between localized magnetic plasmon resonance and propagating surface plasmon polaritons. When studying the linear optical response of the metamaterial structure, this interference phenomenon was observed in the ellipsometric spectrum. By finely tailoring the geometrical parameters of the magnetic metamaterial device, the nonlinear Fano response was tuned to a near-infrared wavelength (1.61–1.8 μm) of femtosecond pump laser, and Fano-type modulation of the third harmonic generation was found and agrees well with our theoretical model.

关键词： MAGNETISM MAGNETIC materials SURFACE plasmon resonance POLARITONS METAMATERIALS

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Enhancement of Interface Properties between Passivation Layers and InSb by Using Remote PECVD

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AIP Conference Proceedings 2011年第1期1399卷 105-106页

作者： Jaeyel Lee Jong‐Seok Woo Sehun Park Jungsub Kim Changjae Yang Sujin Kim Chulkyun Seok Kang Il Lee Jinsub Park Min‐Koo Han Kwang‐Seok Seo Euijoon Yoon aDepartment of Materials Science and Engineering Seoul National University Seoul Korea dDepartment of Electrical Engineering Seoul National University Seoul Korea bHybrid Materials Program (WCU) Department of Materials Science and Engineering Seoul National University Seoul Korea cDepartment of Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon Korea

We report the enhanced interface properties between passivation layers and InSb by using remote PECVD system. SiO2 and Si3N4 layers deposited by remote PECVD showed lower interface trap densities than layers deposited by normal PECVD. SiO2 layers deposited by remote PECVD showed 7.1×1011 cm−2 eV−1 of interface trap density at midgap which is slightly lower than SiO2 layers deposited by PECVD. Si3N4 layers deposited by remote PECVD showed 1.6∼1.7×1012 cm−2 eV−1 at midgap which is 3 times lower than Si3N4 layers deposited by PECVD. Interface properties of SiO2 are superior to that of Si3N4 in both case of PECVD and remote PECVD. To investigate the interface properties between SiO2 and InSb, X‐ray photoelectron spectroscopy was conducted. Indium and antimony oxide phases were found at the interface and these oxide phases could act as the origin of interface traps.

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