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A generalized model of maximizing the sensitivity in intensity- interrogation surface plasmon resonance biosensors

Optics Express 2009年第23期17卷 20771-20776页

作者： Li, Chung-Tien Yen, Ta-Jen Chen, How-Foo Department of Materials Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan Institute of NanoEngineering and MicroSystems National Tsing Hua University Hsinchu 30013 Taiwan Institute of BiophotonicsEngineering National Yang Ming University Taipei 112 Taiwan

Intensity interrogation of surface plasmon resonance (IISPR) biosensors possesses the greatest sensitivity beyond other interrogations and is operated at a fixed incident angle to enable real-time analysis without time delay, so that it promises excellent performance in biological/chemical detection and SPR imaging systems. Here we provide a general model to describe its sensitivity based on Lorentz equation and unveil the relation between the sensitivity and the metal thickness. This model presents the dependency between sensitivity and metal thickness, and the optimal thickness of gold layers to maximize the sensitivity in our experiment is 53 nm that agrees well in both measurement and simulation. This general model can be further applied in other intensity-interrogation SPR configurations as a design rule for sensing and imaging applications. © 2009 Optical Society of America.

关键词： Real time systems

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Effect of varying displacement rates on the densification of nanostructured zirconia by current activation

Effect of varying displacement rates on the densification of...

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作者： Xu, Jin Casolco, Said R. Garay, Javier E. Department of Mechanical Engineering Materials Science and Engineering Program University of California Riverside CA 92521 United States

Nanostructured yttria-stabilized zirconia powder (fully and partially stabilized) was densified using simultaneous applied current and pressure using varying displacement control rates for pressure application. The varying displacement rates were found to significantly affect densification rates as well as the final density of the products at all temperatures in the study. The densification rates were significantly higher than those previously reported without current application. In addition the effective densification activation energies are affected by the displacement control rates, highlighting the importance of pressure application method. © 2009 The American Ceramic Society.

关键词： Densification

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Plasmonic couplings in split-ring resonators by electric excitation

Plasmonic couplings in split-ring resonators by electric exc...

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Metamaterials: Fundamentals and Applications II

作者： Chen, Chia-Yun Yen, Ta-Jen Department of Materials Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan Institute of NanoEngineering and MicroSystems National Tsing Hua University Hsinchu 30013 Taiwan

ISBN: (纸本)9780819476821

We introduce the symmetric and asymmetric coupling between two geometry-different split-ring resonators (SRRs) with dissimilar resonance frequencies and quality factors. An additional sharp transmission peak is excited as the strong coupling occurs between a narrow subradiant resonance and a broad superradiant resonance by examining the spacing of two SRR constituents. The mechanism of such induced transparency is elucidated well by the suppression of induced currents within the SRR element with a lower quality factor. Finally, the excitation of asymmetrically coupled resonance (ACR) is further associated with remarkable confinement of electromagnetic field on nanoscale, providing a dramatically sensing performance due to its pronounced sensitivity and a characteristic of sharp bandwidth. © 2009 SPIE.

关键词： Electric excitation

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Carbon nanostructures as thermal field emitters for waste heat recovery

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Diamond and Related materials 2009年第2-3期18卷 563-566页

作者： Wong, Y.M. Kang, W.P. Davidson, J.L. Raina, S. Huang, J.H. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Program in Material Science Vanderbilt University Nashville TN 37235 United States Department of Materials Science and Engineering National Tsing Hua University Hsinchu 300 Taiwan

Traditional vacuum-based thermal energy conversion (VTEC) devices with "flat" metal emitters have been compromised by high working temperature mainly due to high work function and electron space charge effect. However, a VTEC system is inherently efficient due to unimpeded flow of electrons through vacuum and reduction of heat conduction by the vacuum medium. Consequently, VTEC devices are attractive in terms of space, weight and energy efficiency for waste heat recovery in a TEC system. Carbon nanostructured emitters including multiwalled carbon nanotubes (CNTs) and "ridge" nanodiamond thin films have shown relatively low threshold fields for electron field emission mainly due to their nanoscaled, high aspect ratio, emitting surfaces. In this study, the field-enhancing features of carbon nanostructures were investigated as thermal-field emitters for waste heat recovery. The turn-on field of CNTs was found to decrease from ~ 1.9V/μm at room temperature to ~ 0.9V/μm at 400°C. A high emission current of ~ 26μA was achieved at relatively low field of ~ 1.5V/μm and low temperature of 400°C. The maximum efficiency of the VTEC device is estimated to be ~ 15% at 300°C with a current density of 54mA/cm2. © 2008 Elsevier B.V.

关键词： Temperature

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Kinetics of Molecular Recognition Mediated Nanoparticle Self-Assembly

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Nano Research 2009年第1期2卷 78-84页

作者： Chinmay Soman Todd Giorgio Interdisciplinary Program in Materials Science Vanderbilt University201 West End AvenueNashvilleTN 37240USA Department of Biomedical Engineering Vanderbilt University201 West End AvenueNashvilleTN 37240USA

Nanoscale quantum dot-antibody conjugates have been shown to self-assemble to form micron-scale aggregates in the presence of specific proteomic *** self-assembly process exhibits sigmoidal kinetics,suggesting that nucleation limits ***-assembly kinetics in this study is characterized by flow cytometric analysis of the aggregation reaction over time.A range of physiologically relevant concentrations of the protein angiopoietin-2,a candidate cancer biomarker,are incubated with quantum dots conjugated with a polyclonal mixture of anti-angiopoietin-2 *** concentration modulates the slopes and inflection times of the sigmoidal kinetics *** understanding of self-assembly kinetics in this system may lead to improvements in sensitivity and specificity of this novel proteomic biomarker detection technique and improve the screening,diagnostics,and therapy response monitoring for cancers and other *** approach to studying the kinetics of nanoparticle self-assembly may also provide a valuable tool for understanding the fundamental characteristics of nanoscale particle aggregation.

关键词： Quantum dot self-assembly kinetics proteomics diagnostics has

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Microparticles: Small 3/2010

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Small 2010年第3期6卷

作者： Srijanani Bhaskar Kelly Marie Pollock Mutsumi Yoshida Joerg Lahann Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109 (USA) Department of Chemical Engineering Cornell University Ithaca NY 14853 (USA) Department of Chemical Engineering University of Michigan Ann Arbor MI 48109 (USA) Departments of Chemical Engineering Materials Science and Engineering and Macromolecular Science and Engineering University of Michigan Ann Arbor MI 48109 (USA)

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Enhanced sensitivity by optimizing metal thicknesses in intensity-interrogation surface plasmon resonance biosensors

Enhanced sensitivity by optimizing metal thicknesses in inte...

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SPIE Nanoscience + engineering

作者： Li, Chung-Tien Yen, Ta-Jen Department of Materials Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan Institute of NanoEngineering and MicroSystems National Tsing Hua University 101 Kuang Fu Road Hsinchu 30013 Taiwan

ISBN: (纸本)9780819476876

Intensity interrogation of SPR biosensor owns high sensitivity, and is generally used as SPR microscopy due to the optical intensity variation. Therefore, it is substantial to improve its sensitivity to have a better sensing ability and image quality. In this paper, we discussed numerically and experimentally the influence of sensitivity by metal thickness, and provide a design rule of manifesting optimized thickness to maximize sensitivity in intensity interrogation. © 2009 Copyright SPIE - The International Society for Optical engineering.

关键词： Sensitivity analysis

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Relativistic molecular dynamics simulations of laser ablation process on the xenon solid

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Journal of Heat Transfer 2009年第3期131卷 1-10页

作者： Wang, Yun-Che Chen, Jing-Wen Liao, Lun-De Lin, Hong-Chang Hwang, Chi-Chuan Department of Civil Engineering Materials Program National Cheng Kung University 1 University Road Tainan R.O.C Taiwan Department of Engineering Science National Cheng Kung University 1 University Road Tainan R.O.C Taiwan

The phenomena of Coulomb explosion require the consideration of special relativity due to the involvement of high energy electrons or ions. It is known that laser ablation processes at high laser intensities may lead to the Coulomb explosion, and their released energy is in the regime of kEV to MeV. In contrast to conventional molecular dynamics (MD) simulations, we adopt the three-dimensional relativistic molecular dynamics (RMD) method to consider the effects of special relativity in the conventional MD simulation for charged particles in strong electromagnetic fields. Furthermore, we develop a Coulomb force scheme, combined with the Lennard-Jones potential, to calculate interactions between charged particles, and adopt a Verlet list scheme to compute the interactions between each particle. The energy transfer from the laser pulses to the solid surface is not directly simulated. Instead, we directly assign ion charges to the surface atoms that are illuminated by the laser. By introducing the Coulomb potential into the Lennard-Jones potential, we are able to mimic the laser energy being dumped into the xenon (Xe) solid, and track the motion of each Xe atom. In other words, the laser intensity is simulated by using the repulsive forces from the Coulomb potential. Both nonrelativistic and relativistic simulations are performed, and the RMD method provides more realistic results, in particular, when high-intensity laser is used. In addition, it is found that the damage depth does not increase with repeated laser ablation when the pulse frequency is comparable to the duration of the pulse. Furthermore, we report the time evolution of energy propagation in space in the laser ablation process. The temporal-spatial distribution of energy indirectly indicates the temperature evolution on the surface of the Xe solid under intense laser illumination. Copyright © 2009 by ASME.

关键词： Molecular dynamics

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The VFB Modulation Effect of ALD Grown Al2O3, SrO, La2O3 Capping Layers with HfO2 Gate Dielectrics

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ECS Meeting Abstracts 2010年第22期MA2010-02卷

作者： Sang Young Lee Hyung-Suk Jung Hyo Kyeom Kim Sang Woon Lee Yu Jin Choi Cheol Seong Hwang WCU Hybrid Materials Program Department of Materials Science and Engineering and Inter-university Semiconductor Research Center Seoul National University 599 Gwanak-ro Gwanak-gu Seoul 151-742 Republic of Korea WCU Hybrid Materials Program Department of Materials Science and Engineering and Inter-university Semiconductor Research Center Seoul National University Gwanak-Ro Seoul city 151-744 Republic of Korea Department of Materials Science and Engineering Seoul National University 30-217 daehak-dong gwanak-gu Seoul 151-744 Republic of Korea Seoul National University MSE Seoul National University San#56-1 Shillimdong Seoul 151-744 Republic of Korea

Abstract not Available.

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The Effect of Hf/(Hf+Si) Ratios in Hf1-xSixOy Dielectric Film on Physical and Electrical Stabilities

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ECS Meeting Abstracts 2010年第22期MA2010-02卷

作者： Hyo Kyeom Kim Hyung-Suk Jung Jae Hyuck Jang Sang Young Lee Cheol Seong Hwang Department of Materials Science and Engineering Seoul National University 30-217 daehak-dong gwanak-gu Seoul 151-744 Republic of Korea WCU Hybrid Materials Program Department of Materials Science and Engineering and Inter-university Semiconductor Research Center Seoul National University Gwanak-Ro Seoul city 151-744 Republic of Korea Seoul National University WCU Hybrid Materials Program Department of Materials Science and Engineering and Inter-university Semiconductor Research Center Seoul National University 599 Gwanak-ro Gwanak-gu Seoul 151-742 Republic of Korea MSE Seoul National University San#56-1 Shillimdong Seoul 151-744 Republic of Korea

Abstract not Available.

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