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作者： Lee, Keon-Hun Shin, In Su Park, Sung Hyun Moon, Dae Young Kim, Minhwa Park, Jinsub Nanishi, Yasushi Yoon, Euijoon Department of Materials Science and Engineering Seoul National University Seoul 151-742 Korea Republic of WCU Hybrid Materials Program Department of Materials Science and Engineering Seoul National University Seoul 151-742 Korea Republic of Department of Photonics Ritsumeikan University Kusatsu Shiga 525-8577 Japan Department of Electronic Engineering Hanyang University Seoul 133-791 Korea Republic of Department of Nano Science and Technology Seoul National University Seoul 151-744 Korea Republic of Energy Semiconductor Research Center Advanced Institutes of Convergence Technology Seoul National University Suwon Gyeonggi 443-270 Korea Republic of

Low-temperature (LT) GaN layers with a columnar microstructure were grown on InN layers with various thicknesses. Subsequently, thick, hightemperature GaN layers were grown on the columnar LT GaN/InN/sapphire template. The microstructure of the InN interlayer and the LT GaN columnar structure were investigated by transmission electron microscopy. From the X-ray diffraction analysis, it was shown that the InN layer was decomposed at the initial stage of LT GaN growth. The depth profile of Ga and In atoms from the GaN/InN/sapphire structure obtained by secondary ion mass spectrometry showed that the distribution of In atoms was confined only within the columnar LT GaN and InN/GaN layer interface. Wafer bowing was measured by optical methods and a significant reduction in the extent of wafer bowing was observed for the samples with the columnar LT GaN layer compared with the GaN layer grown on conventional LT GaN buffer layers. It is suggested that the epitaxial growth of a columnar LT GaN layer induced by a polycrystalline InN interlayer helped relax the GaN layer strain energy associated with thermal expansion mismatch, resulting in a less bowed GaN epitaxial layer on the sapphire substrate. © 2012 The Japan Society of Applied Physics.

关键词： Gallium nitride

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Ligand-exchange of TOPO-capped CdSe quantum dots with quinuclidines

Ligand-exchange of TOPO-capped CdSe quantum dots with quinuc...

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

作者： Judy M. Obliosca Fan-Gang Tseng Ching-Mao Huang Leu-Wei Lo Pen-Cheng Wang 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 Division of Medical Engineering Research National Health Research Institutes Zhunan Taiwan

A series of tertiary amine quinuclidine-capped cadmium selenide (Q-CdSe) quantum dots (QDs) of ~4 nm in diameter was successfully synthesized via ligand exchange process in which the original hydrophobic trioctylphosphine oxide (TOPO) ligand bound to QDs was replaced with stronger quinuclidine derivatives, quinuclidine (Q1), 3-quinuclidinone (Q2) and 3-quinuclidinol (Q3). The ligand exchange of TOPO by Q probed using the combined fluorescence and absorption spectroscopy was achieved in just only a few minutes. Moreover, disappearance of prominent C-H aliphatic stretching (~2900 cm -1 ) and phosphate signal (35 ppm) of TOPO-capped CdSe after replacement with Q as revealed in FT-IR and solid state 31 P-NMR spectra was observed indicating efficient fast ligand exchange.

关键词： Nuclear magnetic resonance Spectroscopy Heating nanoelectromechanical systems Multiplexing Electronic mail Microscopy

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Graphene: Van der Waals Epitaxial Double Heterostructure: InAs/Single‐Layer Graphene/InAs (Adv. Mater. 47/2013)

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Advanced Materials 2013年第47期25卷

作者： Young Joon Hong Jae Won Yang Wi Hyoung Lee Rodney S. Ruoff Kwang S. Kim Takashi Fukui Department of Nanotechnology and Advanced Materials Engineering Graphene Research Institute and Hybrid Materials Research Center Sejong University Seoul 143–747 Korea Research Center for Integrated Quantum Electronics Hokkaido University Sapporo 060–8628 Japan Department of Chemistry Center for Superfunctional Materials Pohang University of Science and Technology (POSTECH) Pohang 790–784 Korea Department of Organic and Nano System Engineering Konkuk University Seoul 143–701 Korea Department of Mechanical Engineering and the Materials Science and Engineering Program The University of Texas at Austin Austin TX 78712 United States

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nanoprobes: Near‐Infrared SERS nanoprobes with Plasmonic Au/Ag Hollow‐Shell Assemblies for In Vivo Multiplex Detection (Adv. Funct. Mater. 30/2013)

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Advanced Functional Materials 2013年第30期23卷

作者： Homan Kang Sinyoung Jeong Younggeun Park Joonhyuk Yim Bong‐Hyun Jun San Kyeong Jin‐Kyoung Yang Gunsung Kim SoonGweon Hong Luke P. Lee Jong‐Ho Kim Ho‐Young Lee Dae Hong Jeong Yoon‐Sik Lee Nano Systems Institute and Interdisciplinary Program in Nano‐Science and Technology Seoul National University Seoul 151‐742 Republic of Korea Department of Chemistry Education Seoul National University Seoul 151‐742 Republic of Korea Department of Bioengineering University of California Berkeley Berkeley CA 94720 USA School of Chemical and Biological Engineering Seoul National University Seoul 151‐742 Republic of Korea Department of Bioscience and Biotechnology Konkuk University Seoul 143‐701 Republic of Korea Department of Chemical Engineering Hanyang University Ansan 426‐791 Republic of Korea Department of Nuclear Medicine Seoul National University Bundang Hospital Seongnam 463‐707 Republic of Korea

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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

作者： Lee, Bong-Gu Kim, Jung-Han Department of Nano and IT Fusion Program Seoul National University of Science and Technology Seoul Korea Republic of Department of Mechanical Design and Automation Engineering Seoul National University of Science and Technology Seoul Korea Republic of

ISBN: (纸本)9781424499038

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. © 2011 IEEE.

关键词： Magnetic sensors

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Aggregation-induced emission and biological application of tetraphenylethene luminogens

Aggregation-induced emission and biological application of t...

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作者： Hong, Yuning Lam, Jacky Wing Yip Chen, Sijie Tang, Ben Zhong Department of Chemistry Nano Science and Technology Program Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Polymer Science and Engineering Institute of Biomedical Macromolecules Zhejiang University Hangzhou 310027 China

Tetraphenylethene derivatives [Ph(PhCH=CHPhR)C=C(PhCH=CHPhR)Ph, R=H, CN, NO2, NPh2] with green, yellow-green, and orange emission colours were designed and synthesized. These molecules are practically non-emissive in their dilute solutions but emit intensely as nanoaggregates in poor solvents, demonstrating a novel phenomenon of aggregation-induced emission. Their blended films with poly(methyl methacrylate) also display bright emissions. Restriction of intramolecular motion in the condensed phase may be responsible for such unusual behaviour. Multilayer electroluminescence devices with a configuration of indium tin oxide/N,N′-di(1-naphthyl)-N,N′- diphenylbenzidine/emitter/tris(8-hydroxyquinolinolato)aluminum (Alq 3)/LiF/Al were constructed, which gave green light with a maximum luminance and current efficiency of 12930 cdcm-2 and 3.04cd A -1 respectively. The tetraphenylethenes can serve as excellent cell staining agents for selectively illuminating the cytoplasm and vesicles of living cells. © 2011 CSIRO.

关键词： Cytology

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Improvement of transmittance by fabricating broadband subwavelength anti-reflection structures for polycarbonate

Improvement of transmittance by fabricating broadband subwav...

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作者： Jang, H.S. Kim, J.H. Kim, K.S. Jung, G.Y. Lee, J.J. Kim, G.H. Division of Nano and Bio Technology Daegu-Gyeongbuk Institute of Science and Technology Dalseo-gu Daegu 704-230 Korea Republic of Department of Material Science and Engineering Program for Integrated Molecular System Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of Nano-Mechanical Systems Research Division Korea Institute of Machinery and Materials Daejeon 305-343 Korea Republic of

We report on how to increase transmittance of a 0.2 mm thick polycarbonate (PC) film by periodic subwavelength anti-reflection structures in the visible spectral range. Subwavelength anti-reflection structures like moth-eyes are fabricated into the polycarbonate substrate itself by thermal nanoimprinting lithography (TH-NIL), which uses silicon stamps that have periodic structures such as gratings (lines and spaces) and pillared dots, and are fabricated by laser interference lithography (LIL) and transformer coupled plasma etching. To increase transmittance of a polycarbonate film, we control the periods and shapes of patterns, the number of patterned surfaces, and the overlapping direction of patterns that are fabricated into its surfaces. As a result of this, we show that average transmittance improves as the pattern period gets shorter and as both surfaces of the film are patterned. We also show that the spectrum range gets larger as the pattern period gets shorter and is determined by the longer pattern period in the case of designing a film to have different pattern period on its surfaces. The maximum average transmittance of a polycarbonate film increases up to approximately 6% compared to a bare sample in the 470-800 nm spectral range. Copyright © 2011 American Scientific Publishers All rights reserved.

关键词： Polycarbonates

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Angle and polarization independent plasmonic infrared band-stop filter with metallic disk on SiO2

Angle and polarization independent plasmonic infrared band-s...

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16th Opto-Electronics and Communications Conference, OECC 2011

作者： Abbas, Mohammed Nadhim Cheng, Cheng-Wen Chang, Yia-Chung Shih, Min-Hsiung Research Center for Applied Sciences Academia Sinica Taipei 11529 Taiwan Institute of Physics and Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Department of Engineering and System Science NTHU Hsinchu 300 Taiwan

ISBN: (纸本)9781612842882

We demonstrated Ag/SiO2 metallic disk structure can be applied as an efficient narrow stop band filter in the IR region. The absorption spectra of such structure are investigated both theoretically and experimentally. The metallic disk exhibits only one significant localized surface plasmon polariton mode for both TM and TE polarizations simultaneously which can give an ultrahigh immunity to incident angles and polarization direction. © 2011 National Sun Yat-Sen Univ.

关键词： Silica

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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

作者： So, Byeong-Kwan Kim, Jung-Han Department of Nano and IT Fusion Program Seoul National University of Science and Technology 172 Gongneung-dong Nowon-gu Seoul Korea Republic of Department of Mechanical Design and Automation Engineering Seoul National University of Science and Technology 172 Gongneung-dong Nowon-gu Seoul Korea Republic of

ISBN: (纸本)9781424499038

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. © 2011 IEEE.

关键词： Kalman filters

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Strong Light-Induced Negative Optical Pressure Arising from Kinetic Energy of Conduction Electrons in Plasmon-Type Cavities

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Physical Review Letters 2011年第8期106卷 087401-087401页

作者： H. Liu Jack Ng S. B. Wang Z. F. Lin Z. H. Hang C. T. Chan S. N. Zhu National Laboratory of Solid State Microstructures & Department of Physics Nanjing University Nanjing 210093 People’s Republic of China Department of Physics and Nano Science and Technology Program Hong Kong University of Science and Technology Clearwater Bay Hong Kong China Key Laboratory of Micro and Nano Photonic Structures Fudan University Shanghai China

We found that very strong negative optical pressure can be induced in plasmonic cavities by LC resonance. This interesting effect could be described qualitatively by a Lagrangian model which shows that the negative optical pressure is driven by the internal inductance and the kinetic energy of the conduction electrons. If the metal is replaced by perfect conductors, the optical pressure becomes much smaller and positive.

关键词： Kinetic energy

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