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22nd International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2018

作者： Wu, Wei-Cheng Chen, Hsin-Yi Tiffany Lin, Shih-Chi Chen, Hsin-Ying Chen, Fu-Rong Chang, Huan-Tsung Tseng, Fan-Gang Department of Engineering and System Science National Tsing Hua University Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan Research Center for Applied Sciences Academia Sinica Taiwan Department of Chemistry National Taiwan University Taiwan Department of Chemistry Chung Yuan Christian University Taiwan

ISBN: (纸本)9781510897571

Salivary uric acid is regarded as a noninvasive biomarker of metabolic syndrome and renal disorder. Although many enzyme based assays have been developed for quantitation of uric acids, most of the biological reagents are only stable for 30 days after opening even stored at 2-8 °C. To overcome this short-lasting problem, long-lasting (more than two years), easily stored and cost-effective nonenzymatic C-dots prepared from PEI through a simple hydrothermal method were developed. Experimental results reveal that the sensitivity of the PEI C-dot assay for uric acid is higher than that of reported fluorescece and enzyme based sensors. Copyright © (2018) by Chemical and Biological Microsystems Society. All rights reserved.

关键词： nanodots

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Numerical study of the phase slips in ultrathin doubly connected superconducting cylinders

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Physical Review B 2009年第5期79卷 054513-054513页

作者： Chunyin Qiu Tiezheng Qian Program in Nano Science and Technology Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China Department of Mathematics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China

In the framework of Ginzburg-Landau theory, we numerically investigate the thermally activated phase slips which are responsible for the current dissipation in ultrathin doubly connected superconducting cylinders in the presence of transport current and external magnetic field along the cylinder axis. A hollow cylinder of radius R is mathematically transformed into a two-dimensional (2D) superconducting strip of width w=2πR with periodic boundary condition. The phase slips may occur via free-energy saddle points of two distinct kinds. The saddle points of the first kind exhibit a one-dimensional (1D) variation of order parameter described by the (extended) Langer-Ambegaokar-McCumber-Halperin (LAMH) theory [Phys. Rev. 164, 498 (1967); Phys. Rev. B 1, 1054 (1970)]. The saddle points of the second kind exhibit a 2D variation of order parameter, showing that each phase slip is realized through a thermally activated process of vortex-antivortex pair creation and annihilation. In particular, there exists a critical radius Rc separating the 1D LAMH behavior (below Rc) and the 2D vortex-antivortex behavior (above Rc). The effects of external magnetic field on these saddle points are presented. The critical radius Rc is found to decrease with increasing field strength, and hence applying a magnetic field may induce a transition in the phase-slip characteristics.

关键词： fluctuations in superconductors Ginzburg-Landau theory mixed state

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Highly doped p-type a-plane GaN grown on r-plane sapphire substrate

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MRS Online Proceedings Library 2021年第1期892卷 381-384页

作者： Y. Tsuchiya Y. Okadome H. Furukawa A. Honshio Y. Miyake T. Kawashima M. Iwaya S. Kamiyama H. Amano I. Akasaki Faculty of Science and Technology 21st-Century COE Program “Nano-Factory” Meijo University Tempaku-ku. Nagoya Japan

Mg-doped p-type a-plane GaN films were grown on unintentionally doped a-plane GaN templates by metalorganic vapor phase epitaxy (MOVPE). The Mg concentration in a-plane GaN increased with increasing Mg source gas flow rate. A maximum hole concentration of 2.0 × 1018 cm−3 with a hole mobility of 4.5 cm2/Vs and resistivity of 0.7 Ω·cm were achieved. The activation ratio was 5.0 × 10-2. It was found that a maximum hole concentration in p-type a-plane GaN was higher than that in p-type c-plane GaN. The activation energy of Mg acceptors in p-type a-plane GaN with the maximum hole concentration was found to be 118 meV by temperature-dependent Hall-effect measurement.

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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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Single-Molecule Vibrational Characterization of Binding Geometry Effects on Isocyanide-Metal Interactions

arXiv

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arXiv 2025年

作者： Bi, Liya Wang, Zhe Balto, Krista Tao, Andrea R. Pascal, Tod A. Zhang, Yanning Figueroa, Joshua S. Li, Shaowei Department of Chemistry and Biochemistry University of California La Jolla San DiegoCA92093-0309 United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States Department of Physics and Astronomy University of California IrvineCA92697-4575 United States Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu611731 China Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California La Jolla San DiegoCA92093-0448 United States

Isocyanide-metal binding is governed by σ-donation and π-back-bonding, which affects the energy of the isocyanide stretching mode—a characteristic probe for ligand-metal interactions. While extensive correlations exist between structure and spectroscopy in molecular isocyanide-metal systems, isocyanide interactions with metallic crystalline surfaces, where ligands often bind in various geometries, remain poorly understood. Conventional vibrational spectroscopies, such as infrared and Raman, lack the molecular-scale resolution needed to distinguish these inhomogeneous configurations. In contrast, inelastic electron tunneling spectroscopy with scanning tunneling microscopy (STM-IETS) enables direct visualization of ligand adsorption geometries and their vibrational signatures. Using STM-IETS, here we investigate an metal-adsorbed m-terphenyl isocyanide ligand and find that adsorption geometry on Cu(100) induces a significant shift in isocyanide stretching frequency, even greater than replacing Cu(100) with Ag(111). Density functional theory confirms this shift arises from atomic-scale variations in isocyanide-metal binding. This study elucidates how atomic-scale binding influences the vibrational signatures of isocyanide ligands—an often-overlooked factor in understanding isocyanide-metal interactions. © 2025, CC BY.

关键词： Vibrational spectroscopy

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The measurements of thermal conductivity of CuFeSe2 thin film using 3ω technique

The measurements of thermal conductivity of CuFeSe2 thin fil...

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作者： Lee, P.L. Ou, M.N. Zhong, Z.W. Luo, J.Y. Wu, M.K. Chen, Y.Y. Nano Science and Technology Program Institute of Physics Academia Sinica 128 Academia Road Nankang Taipei 115 Taiwan Department of Engineering and System Science National TsingHua University Hsinchu Taiwan 30013 Taiwan Institute of Physics Academia Sinica Taipei Taiwan 11529 Taiwan

ISBN: (纸本)9781605950150

The cross plane thermal conductivity of CuFeSe2 thin film was determined by differential 3 omega technique with a deposited Au-Cr narrow strip as the microprobe. The microprobe was driven by an AC current at frequency ω and result a third-harmonic voltage corresponding to the temperature drop for the calculation of thermal conductivity across the thin film. In order to obtain the accurate data by excluding the influence of thermal resistance of interfaces between film and substrate, a series of thin films with various thickness of 200, 400, 600 and 800 nm were prepared for systematic study. Basically the thermal conductivity is linearly dependent on temperature for T=100-350 K. One interesting finding is that the thinner the film the larger the thermal conductivity. For example, at 300 K the thermal conductivity of the 200 nm thin film is about 8.8 W·m-1·K-1, whereas the thermal conductivity of 600 and 800 nm films are 2.4 and 1.7 W·m-1·K-1 respectively. This consequence is attributed to the better crystallization in thinner films that was confirmed by X-ray diffraction analysis.

关键词： Thin films

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Design and synthesis of a tripodal receptor for the selective detection of Fe3+ 2

Design and synthesis of a tripodal receptor for the selectiv...

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2nd International Conference on Advanced Materials, SCICON 2019

作者： Tamil Selvan, R. Tamil Selvan, G. Varadaraju, Chitra Enoch, Israel V.M.V. Mosae Selvakumar, P. Department of Nano Science and Technology KITS Coimbatore Tamil Nadu641114 India Department of Chemistry KITS Coimbatore Tamil Nadu641114 India Department of Chemistry St. Joseph's College for Women Tirupur641 604 India Science and Math Program Asian University for Women Chittagong4000 Bangladesh

The tripodal receptor (Ty) was synthesized from naphthol and tren units. The metal ion recognition property of the tripodal receptor Ty was analysed using UV–Visible and fluorescence techniques. The structure of Ty receptor is confirmed by FT-IR and NMR spectral data. The Elemental and surface morphology were determined by EDAX and SEM analysis. Fluorescence analysis revealed a positive selectivity towards Fe3+ ions, in minimal conditions. The receptor Ty selectively recognizes Fe3+ ions through fluorescence switch-on process in which a bright green luminescence was observed on binding with Fe3+ ions. Further, the binding stoichiometry for [Ty-Fe3+] exhibited 1:1 ratio and the binding constant value was found to be 5.1127 × 106 M-1 © 2019 Elsevier Ltd. All rights reserved.

关键词： Metals

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Active loading of cyanine 5.5 derivatives into liposomes for deep self-quenching and their applications in deep tissue imaging

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Sensors and Diagnostics 2024年第6期3卷 1028-1038页

作者： Chen, Chong-Yan Jian, Cheng-Bang Gao, Hua-De Yu, Xu-En Chang, Yuan-Chih Leong, Shwee Khuan Shie, Jiun-Jie Lee, Hsien-Ming Institute of Chemistry Academia Sinica Taipei 11529 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei 11529 Taiwan Department of Chemistry National Taiwan University Taipei 10617 Taiwan Institute of Biological Chemistry Academia Sinica Taipei 11529 Taiwan Academia Sinica Cryo-EM Center Academia Sinica Taipei 11529 Taiwan Sustainable Chemical Science & Technology Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University (NYCU) Hsinchu 30050 Taiwan

Visualizing liposome release profiles in small animals is important for evaluating the pharmacokinetic influence of vesicles. Encapsulating near-infrared (NIR) fluorescent dyes to visualize and report liposomal cargo release in vivo, which necessitates high encapsulation with deep self-quenching, is highly desirable in advanced (such as targeting or trigger-release) liposome development. However, passive loading of NIR dyes usually yields low encapsulation efficiencies (1-5%), causing significant wastage and cost-ineffectiveness while using expensive NIR fluorescent dyes. It would be highly beneficial if an active loading method, which typically has an encapsulation efficiency of nearly 100%, is developed. This research describes an active loading approach for two cyanine 5.5 (Cy5.5) derivatives. We discovered that using ammonium sucrose octasulfate (ASO) as a trapping agent allows for nearly 100% encapsulation for both Cy5.5 dyes, accompanied by the formation of nanoprecipitates inside the liposome, as evidenced by cryogenic electron microscopy. Fluorescence spectroscopy confirmed deep fluorescence self-quenching after active loading and a 60-100-fold fluorescence enhancement upon full content release via liposome rupture. Cellular uptake experiments showed that the fluorescence of Cy5.5-loaded liposomes recovered and plateaued after 9 hours of incubation with cells. In vivo fluorescence imaging (IVIS) demonstrated the same fluorescence activation in tumor-bearing mice intratumorally injected with the liposome. We believe that the developed active loading method will enable Cy5.5-loaded liposomes to be a deep tissue-compatible and cost-effective NIR fluorescence release-reporting platform. © 2024 RSC.

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Cascaded-Type Band Alignment of a WBG Perovskite/NBG Perovskite For Heterostructure Solar Cells

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ACS Applied Energy Materials 2024年第8期7卷 3039-3048页

作者： Thakran, Anjali Mohapatra, Anisha Verma, Hemant Hofmann, Mario Ansari, Zeeshan Alam Hanmandlu, Chintam Lu, Chung Hsin Chu, Chih Wei Department of Physics National Taiwan University Taipei106 Taiwan Research Center for Applied Sciences Academia Sinica 128 Academia Road Section 2 Nangang Taipei11529 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei106 Taiwan Department of Chemical Engineering National Taiwan University Taipei106 Taiwan Department of Photonics National Yang Ming Chiao Tung University Hsinchu City30010 Taiwan College of Engineering Center for Green Technology Chang Gung University Taoyuan City333002 Taiwan

The performance of single-junction mixed-halide perovskite-based solar cells is limited by thermalization and spectral losses. With advanced device architectures, the perovskite/perovskite heterostructure, where two or more photoactive layers are stacked together, can help to minimize these losses. In this work, we conformally transfer printed a narrow-band-gap perovskite over a spin-coated wide-band-gap perovskite layer to form a perovskite/perovskite heterostructure. This heterostructure results in broader spectral coverage and the higher position of the lowest unoccupied molecular orbital (LUMO) level of MAPbBrxI3-x compared to MA0.7FA0.3Pb0.5Sn0.5I3, forming a cascaded energy level alignment between photoactive layers. Additionally, direct evidence of improved morphology has been observed with the transfer-printing technique in heterostructure formation. The bottom layer provides favorable assistance for the growth of the top perovskite near the interface with good coverage and maintains the quality of the film. Thus, the increased crystallinity and reduced grain boundaries lead to less defects. This reduction played a key role in suppressing recombination losses at the interfaces, ultimately leading to improved device performance. These inherent properties have a positive impact on the photovoltaic response of the device, resulting in broader spectral response and power conversion efficiencies (PCEs) of 14.76% in the heterostructure device. A notable improvement is achieved compared to control single-junction devices, which typically have a PCE of nearly 10% with printed-Sn and 12% with spin-Br-based devices. Moreover, the heterostructure-based device exhibits high stability, retaining almost 80% of its initial PCE value for almost 1000 h with proper encapsulation. Our technique can be utilized for designing low-temperature and solution-processed stacked layers, applicable for optoelectronic devices, including light-emitting diodes (LEDs), sensors, and transist

关键词： Perovskite

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Power-free automated capillary flow assay for SARS-CoV-2 detection 24

Power-free automated capillary flow assay for SARS-CoV-2 det...

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24th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2020

作者： Link, Jeremy Carrell, Cody Jang, Ilhoon Panraksa, Yosita Sánchez-Cano, Ana Call, Zachary Noviana, Eka Dandy, David S. Geiss, Brian J. Henry, Charles S. Department of Chemistry Colorado State University United States Institute of Nano and Science and Technology Hanyang University Korea Republic of Program in Biotechnology Faculty of Science Chulalongkorn University Thailand Spain Department of Chemical and Biological Engineering Colorado State University United States Department of Microbiology Immunology and Pathology Colorado State University United States

ISBN: (纸本)9781733419017

An at-home serological test for SARS-CoV2 antibodies was developed that automatically performs sequential reagent delivery and washing for enzyme amplified colorimetric detection. The device that houses the assay enables improved sensitivity and selectivity without sacrificing simplicity for untrained end-users. The microfluidic device was made by laminating transparency sheets and double-sided adhesive and requires only two user steps to operate. Once flow is initiated in the microfluidic channels, reagents are sequentially delivered to and washed from a detection zone, where a colored line indicates the presence of antibodies. Anti-SARS-CoV-2 nucleocapsid protein has been detected from whole blood at clinically relevant concentrations. © 2020 CBMS-0001

关键词： Coronavirus

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