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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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    Optical Properties of Plasmonic Mirror-Image Nanoepsilon
    (2016-07-12)
    Lin, Jia-Yu
    ;
    Tsai, Chia-Yang
    ;
    Lin, Pin-Tso
    ;
    Hsu, Tse-En
    ;
    Hsiao, Chi-Fan
    We propose a novel mirror-image nanoepsilon (MINE) structure to achieve highly localized and enhanced near field at its gap and systematically investigate its plasmonic behaviors. The MINE can be regarded as a combination of two fundamental plasmonic nanostructures: a nanorod dimer and nanoring. By adapting a nanoring surrounding a nanorod dimer structure, the nanorod is regarded as a bridge pulling the charges from the nanoring to the nanorod, which induces stronger plasmon coupling in the gap to boost local near-field enhancement. Two resonance peaks are identified as the symmetric and anti-symmetric modes according to the symmetries of the charge distributions on the ring and rod dimer in the MINE. The symmetric mode in the MINE structure is preferred because its charge distribution leads to stronger near-field enhancement with a concentrated distribution around the gap. In addition, we investigate the influence of geometry on the optical properties of MINE structures by performing experiments and simulations. These results indicate that the MINE possesses highly tunable optical properties and that significant near-field enhancement at the gap region and rod tips can be realized by the gap and lightning-rod effects. The results improve understanding of such complex systems, and it is expected to guide and facilitate the design of optimum MINE structures for various plasmonic applications.
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    In situ TEM investigation of dynamical changes of nanostructures
    (2010-11-22)
    Chen, L. J.
    ;
    Wu, W. W.
    ;
    材料科學與工程學系
    ;
    Department of Materials Science and Engineering
    In situ investigation of the temperature induced phase transformation, structural and chemical evolution of nanocrystals is important for understanding the structure and stability of nanomaterials. Transmission electron microscopy (TEM), one of the most powerful tools for characterizing nanostructured materials, is essential for the development of nanotechnology. In situ TEM is a technique that allows a direct observation of dynamic properties in nanoscale. Recent development of ultra-high vacuum TEM (UHV-TEM) further enables the investigation on atomic-scale materials systems in a clean environment. The appropriate utilization of the UHV-TEM will be beneficial in studying the fundamental mechanisms of dynamic reactions, formation of transient phase, solid-state amorphization, epitaxial growth, growth kinetics and evolution of defects. In this paper, we present the most recent progress in observing dynamic processes in nanoscale by in situ UHV-TEM. (C) 2010 Elsevier B.V. All rights reserved.
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    ZnO nanowires coated stainless steel meshes as hierarchical photocatalysts for catalytic photodegradation of four kinds of organic pollutants
    (2016-09-05)
    Ko, Fu-Hsiang
    ;
    Lo, Wei-Ju
    ;
    Chang, Yu-Cheng
    ;
    Guo, Jin-You
    ;
    Chen, Chien-Ming
    ZnO nanostructures were grown on the stainless steel mesh substrates using an aqueous chemical growth method. The different additives (such as 1,3-diaminopropane and polyethyleneimine) can be used to control the morphology of ZnO nanostructures. ZnO nanowires exhibit very prominent green emission and week UV emission from defect and band gap in the cathodoluminescence spectrum, respectively. The different morphology of ZnO nanostructures on the stainless steel mesh substrates can be used to irradiate UV light for the photocatalytic degradation of four kinds of organic pollutants, such as methylene blue, rhodamine 6G, methyl orange, and 4-nitrophenol. The ZnO nanowires can provide a higher surface-to-volume ratio and stronger defect emission, resulting in their highest photocatalytic performance in 10 W UV light irradiation. The ZnO nanowire arrays on the stainless steel mesh substrates provide a large-scale, facile, low-cost, high surface area, and high photocatalytic efficiency, which shall be of significant value for practical applications of the decomposition of environment pollutants and reusing of wastewater treatment. (C) 2016 Elsevier B.V. All rights reserved.
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    GaSb/GaAs quantum dots and rings grown under periodical growth mode by using molecular beam epitaxy
    (2015-09-01)
    Chen, Hsuan-An
    ;
    Shih, Tung-Chuan
    ;
    Tang, Shiang-Feng
    ;
    Weng, Ping-Kuo
    ;
    Gau, Yau-Tang
    GaSb/GaAs quantum dots (QDs) and quantum rings (QRs) are investigated. By using periodical growth interrupts, precise coverage control can be achieved for GaSb QD growth by using a single Ga source. With direct As irradiation to the substrate surface during the post soaking time, the soaking time can be effectively reduced while full ring morphologies and room-temperature QR luminescence can still be obtained by using this method. (C) 2015 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of MnWO4 nanoparticles encapsulated in mesoporous silica SBA-15 by fast microwave-assisted method
    (2015-02-01)
    Luc Huy Hoang
    ;
    Pham Van Hanh
    ;
    Nguyen Dang Phu
    ;
    Chen, Xiang-Bai
    ;
    Chou, Wu Ching
    The MnWO4 nanoparticles encapsulated in mesoporous silica (MnWO4/SBA-15) was successfully synthesized by a fast microwave-assisted method. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen absorption desorption isotherm, and Fourier transform infrared spectroscopy (FTIR). Our results showed that the MnWO4/SBA-15 nanocomposites have the ordered hexagonal meso-structure of SBA-15, indicating MnWO4 nanoparticles were successfully distributed into the channels of SBA-15. The size of MnW04 nanoparticles in SBA-15 is significantly smaller than the size of MnWO4 nanoparticles prepared without SBA-15, indicating that the MnWO4/SBA15 nanocomposites would be very promising for improving photocatalytic activity of MnWO4 nanoparticles. (C) 2014 Elsevier Ltd. All rights reserved.
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    Gold nanoparticles: BSA (Bovine Serum Albumin) coating and X-ray irradiation produce variable-spectrum photoluminescence
    (2015-01-15)
    Lee, Kuo-Hao
    ;
    Lai, Sheng-Feng
    ;
    Lin, Yan-Cheng
    ;
    Chou, Wu-Ching
    ;
    Ong, Edwin B. L.
    We show that by using different x-ray irradiation times of BSA-coated Au nanoparticles (NPs) we can change their ultraviolet-stimulated photoluminescence and shift the spectral weight over the visible spectral range. This is due to the interplay of two emission bands, one due to BSA and the other related to gold. The emission properties did not change with time over a period of several months. (C) 2014 Published by Elsevier B.V.
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    雜質原子影響量子點接觸的熱差電性的研究
    (1993)
    朱仲夏
    ;
    交通大學電子物理學系
    近代科技發展的趨向是"微型化",亦即是將 電子元件的大小不斷縮小.也就是這趨勢帶動 了毫微米元件制作技術的發展.要讓毫微米元 件制作技術--這當前尖端的科技能迅速地發展, 必須同時對毫微米元件的物理特性有相當程度 的了解及掌握.因此近來大量的研究活動都是 針對毫微米元件的物理特性從理論方面及實驗 方面作了探討.很自然的,電子輸運特性成為了 大部份研究活動的中心課題.我們也曾探討過 雜質原子對電子輸運特性的影響,所得到的結 論也與後來的實驗及理論結果相吻合.根據我 們以往在這方面的了解,我們計劃研究雜質原 子對毫微米元件的熱差電性的影響.毫微米元件的熱差電性巳漸漸受到重視,並且最近的兩 個實驗中都分別証實了熱差電性是可以測量到 的.這兩個實驗都有利用到量子點接觸及它的 輸運特性.量子點接觸是一個連接兩個高遷移 性的二維電子氣的狹窄通道,這通道的橫向大 小是在100A左右,並且可以利用電位差的方法控 制量子點接觸的大小.在低溫的情況下,量子點 接觸的電導是量子化的,這是由於電子在通過 狹窄的通道時,它的橫向能量是量子化,形成了多個橫向能帶.每個帶有電子的橫向能帶都提 供了相等的電流,所以電導的量子化正好反映 了橫向能帶的量子化.這電導的量子化並不穩 定,雜質原子的影響十分顯著.尤其是在略帶吸 引的雜質原子出現時,電導會在由一量子化的 值改變為另一量子化值的條件狀況附近發生很 大改變.換句話說,雜質原子的影響會在以上說 及的條件狀況下最顯著.在同一條件狀況下,實 驗及理論都証實了量子點接觸的熱差電系數(Thermopower)是最大的,所以我們相信雜質原子,尤 其是略帶吸引的雜質原子的影響是不可忽略的 .在實驗中利用量子點接觸的熱差電特性來作 微溫度計的日子巳近在眼前的時候,我們相信 雜質原子對熱差電特性的影響是必需解決的課 題.
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    Growth and optical properties of high-density InN nanodots
    (2010-10-15)
    Ke, W. C.
    ;
    Lee, S. J.
    ;
    Kao, C. Y.
    ;
    Chen, W. K.
    ;
    Chou, W. C.
    High density InN/GaN nanodots were grown by pulsed mode (PM) metal-organic chemical vapor deposition (MOCVD). InN nanodots density of up to similar to 5 x 10(10) cm(-2) at a growth temperature of 550 degrees C was achieved. The high diffusion activation energy of 2.65 eV due to high NH(3) flow rate generated more reactive nitrogen adatoms on the growth surface, and is believed to be the main reason for the growth of high density InN nanodots. In addition, an anomalous temperature dependence of the PL peak energy was observed for high density InN nanodots. The high carrier concentration, due to high In vacancy (V(ln)) in the InN nanodots, thermally agitated to the conduction band. As the measurement temperature increased, the increase of Fermi energy resulted in blue-shifted PL peak energy. From the Arrhenius plot of integrated PL intensity, the thermal activation energy for the PM grown InN nanodots was estimated to be E(a)similar to 51 meV, indicating strong localization of carriers in the high density InN nanodots. (C) 2010 Elsevier B.V. All rights reserved.
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    In situ TEM investigation of dynamical changes of nanostructures
    (2010-11-22)
    Chen, L. J.
    ;
    Wu, W. W.
    ;
    材料科學與工程學系
    ;
    Department of Materials Science and Engineering
    In situ investigation of the temperature induced phase transformation, structural and chemical evolution of nanocrystals is important for understanding the structure and stability of nanomaterials. Transmission electron microscopy (TEM), one of the most powerful tools for characterizing nanostructured materials, is essential for the development of nanotechnology. In situ TEM is a technique that allows a direct observation of dynamic properties in nanoscale. Recent development of ultra-high vacuum TEM (UHV-TEM) further enables the investigation on atomic-scale materials systems in a clean environment. The appropriate utilization of the UHV-TEM will be beneficial in studying the fundamental mechanisms of dynamic reactions, formation of transient phase, solid-state amorphization, epitaxial growth, growth kinetics and evolution of defects. In this paper, we present the most recent progress in observing dynamic processes in nanoscale by in situ UHV-TEM. (C) 2010 Elsevier B.V. All rights reserved.
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    Magneto-optical properties of ZnMnTe/ZnSe quantum dots
    (2011-05-15)
    Fan, W. C.
    ;
    Ku, J. T.
    ;
    Chou, W. C.
    ;
    Chen, W. K.
    ;
    Chang, W. H.
    The sigma(+) and sigma(-) circularly polarized time-integrated and time-resolved Photoluminescence (PL) measurements were employed to investigate the carrier spin dynamics of ZnMnTe/ZnSe Quantum Dots (QDs) grown on GaAs substrates by molecular beam epitaxy. The Kohlrausch's stretching exponential function well correlates both the sigma(+) and sigma(-) decay profiles. The measured spin relaxation time is about 23 ns. (C) 2010 Elsevier B.V. All rights reserved.