Browsing by Issue Date, starting with "2017-06-07"

Now showing 1 - 20 of 13665

Identification of a Simplest Hypervalent Hydrogen Fluoride Anion in Solid Argon
(2017-06-07)
Liu, Meng-Chen
;
Chen, Hui-Fen
;
Chin, Chih-Hao
;
Huang, Tzu-Ping
;
Chen, Yu-Jung
Hypervalent molecules are one of the exceptions to the octet rule. Bonding in most hypervalent molecules is well rationalized by the Rundle-Pimentel model (three-center four-electron bond), and high ionic bonding between the ligands and the central atom is essential for stabilizing hypervalent molecules. Here, we produced one of the simplest hypervalent anions, HF-, which is known to deviate from the Rundle-Pimentel model, and identified its ro-vibrational features. High-level ab inito calculations reveal that its bond dissociation energy is comparable to that of dihalides, as supported by secondary photolysis experiments with irradiation at various wavelengths. The charge distribution analysis suggested that the F atom of HF-is negative and hypervalent and the bonding is more covalent than ionic.
Thiophene and diketopyrrolopyrrole based conjugated polymers as efficient alternatives to spiro-OMeTAD in perovskite solar cells as hole transporting layers
(2017-06-07)
Peng, Shih-Hao
;
Huang, Tzu-Wei
;
Gollavelli, Ganesh
;
Hsu, Chain-Shu
;
應用化學系
Poly[(5,5 '-bis(3-dodecyl-2-thienyl)-2,2 '-bithiophene)] (PQT), poly-(2,5-bis(3-alkylthiophene-2-yl)thieno-[3,2-b]thiophene) (PBTTT), poly{2,2 '-[(2,5-bis(2-octyldodecyl)-3,6-dioxo-2,3,5,6-tetrahydropyrrolo[3,4-c]pyrrole-1,4-diyl)]dithiophene-5,5 '-diyl-alt-2,2 '-bithiophene-5,5 '-diyl} (PDQT) and poly{2,2 '-[(2,5-bis(2-octyldodecyl)-3,6-dioxo-2,3,5,6-tetrahydropyrrolo[3,4-c]pyrrole-1,4-diyl)]dithiophene-5,5 '-diyl-alt-thieno-[3,2-b]thiophene-2,5-diyl} (PDBT-co-TT) were used to replace spiro-OMeTAD as efficient hole transporting layers (HTLs) in perovskite solar cells (PSCs). We demonstrated that both the hole mobility and suitable energy levels of these polymers are important factors in PSCs using organic field-effect transistors (OTFTs) and cyclic voltammetry analysis. The doping effect and the hydrophobic properties of the HTLs were investigated using atomic force microscopy (AFM) and water contact angle measurements. The results show that the PBTTT-14 and PDBT-co-TT based PSCs showed the best PCE of 14.1% and 12.0%, respectively when compared with spiro-OMeTAD based PSCs which have a PCE of 10.2%.
Naphthodipyrrolidone (NDP) based conjugated polymers with high electron mobility and ambipolar transport properties
(2017-06-07)
Zhang, Haichang
;
Zhang, Shuo
;
Mao, Yifan
;
Liu, Kewei
;
Chen, Yu-Ming
Two novel donor-acceptor pi-conjugated polymers based on naphthodipyrrolidone (NDP) were synthesized and characterized. The polymers possess low band gaps and suitable molecular orbital levels as ambipolar semiconductors. The thin film organic field effect transistor of NDP polymers exhibited ambipolar transport properties with a high electron mobility up to 0.67 cm(2) V-1 s(-1). The grazing-incidence wide-angle X-ray scattering (GIWAXS) studies demonstrated that the polymer molecules pack into a long-range-ordered lamellar structure with isotropically oriented crystalline domains. Thermal annealing promoted edge-on lamellar stacking as evidenced by the increased diffraction intensity along the out-of-plane direction. The polymer with NDP and bithiophene units achieved the best edge-on lamellar stacking after thermal annealing, which yielded the best electron transport performance in this work.
Fractional Solitons in Excitonic Josephson Junctions (vol 5, 15796, 2015)
(2017-06-07)
Hsu, Ya-Fen
;
Su, Jung-Jung
;
電子物理學系
;
Department of Electrophysics
Dynamic supramolecular self-assembly: hydrogen bonding-induced contraction and extension of functional polymers
(2017-06-07)
Cheng, Chih-Chia
;
Wang, Jui-Hsu
;
Chuang, Wei-Tsung
;
Liao, Zhi-Sheng
;
Huang, Jyun-Jie
Simple construction and manipulation of low-molecular-weight supramolecular polymers, based on incorporation of self-complementary multiple hydrogen bonding interactions, with the desired dynamic response characteristics to achieve high-efficiency supramolecular assembly and control the morphological properties of the polymers remain highly challenging. Herein, we developed a new difunctional tele-chelic supramolecular polymer (UrCy-PPG) containing self-complementary quadruple hydrogen-bonded ureido-cytosine (UrCy) moieties, which spontaneously self-assembles to form long-range-ordered lamellar structures in the bulk state. Scattering and rheological studies confirmed that the dynamic behavior of UrCy units induces structural phase transitions from quadruple to dual hydrogen-bonded arrays, leading to well-controlled, self-organized supramolecular nanostructure morphologies. The microstructural features could be easily tuned by altering environmental conditions, making the self-assembly processes highly efficient. Importantly, temperature/shear stress-dependent microstructural analyses indicated that UrCy-PPG has the capacity to manipulate the transition between contractile and fully extended lamellar structures. Given its novelty, simple synthesis, high reliability, and efficient self-assembly processes, this newly developed supramolecular polymer represents a new concept and pathway for controlled arrangement of self-assembled polymeric nanostructures.
MOVEMENT ASSISTANCE SYSTEM AND METHOD THEREOF
(2017-06-08)
Kai-Tai SONG
;
Yu-Lin CHIEN
A movement assistance method includes following steps: detecting a center of pressure; generating a gravity scale according to the center of pressure; measuring a joint angle and estimating a user external torque and a motor torque; generating a compensated assistive torque according to the user external torque, the joint angle, the motor torque and the gravity scale.
COOPERATIVE TRANSMISSION SYSTEM AND COOPERATIVE TRANSMISSION METHOD FOR MULTIPLE ACCESS POINTS IN A WIRELESS LOCAL AREA
(2017-06-08)
Sau-Hsuan Wu
;
Hsi-Lu Chao
;
Chun-Kai Tseng
A cooperative transmission system and a cooperative transmission method used in multiple access points in a wireless local network are provided. The cooperative transmission system includes a plurality of access points, a clustering controller and at least one cluster controller. Each of the access points serves at least one user device within a serving range of the access point. The clustering controller clusters the access points into a plurality of clusters according to locations of the access points and the serving range. The at least one cluster controller controls cooperative synchronous downlink transmissions among all the access points within a cluster governed by the cluster controller, and the clusters, when intersecting with one another, employ an interference suppression mechanism to eliminate interference generated by the user devices or neighboring access points located in different clusters. Through the use of the cooperative communication technique and the interference suppression mechanism, the interference generated by a plurality of access points in a wireless local network due to overlapped basic service sets is avoided.
IMPEDANCE-TO-DIGITAL CONVERTER, IMPEDANCE-TO-DIGITAL CONVERTING DEVICE, AND METHOD FOR ADJUSTMENT OF IMPEDANCE-TO-DIGITAL CONVERTING DEVICE
(2017-06-08)
Jin-Chern CHIOU
;
Shun-Hsi HSU
An impedance-to-digital converter is provided. A sensible impedance range of the impedance-to-digital converter is adjustable by changing magnitudes of signals inputted thereto.
Iptycenes with an acridinone motif developed through [4+2] cycloaddition of tethered naphthalene and iminoquinone via a radical reaction
(2017-06-11)
Raju, Selvam
;
Annamalai, Pratheepkumar
;
Chen, Pei-Ling
;
Liu, Yi-Hung
;
Chuang, Shih-Ching
A new class of iptycenes was developed by combining 2-(naphthalen-1-yl) anilines and p-benzoquinones through copper( II)-mediated radical cyclisation. This unusual cyclisation reaction resulted in the robust and efficient syntheses of iptycenes with an acridinone motif. These iptycenes can be further transformed into planar acridinone heterocyclics through the Diels-Alder reaction.
Single-photon avalanche diodes in 0.18-mu m high-voltage CMOS technology
(2017-06-12)
Huang, L. D.
;
Wu, J. Y.
;
Wang, J. P.
;
Tsai, C. M.
;
Huang, Y. H.
We have designed and fabricated high-performance single-photon avalanche diodes (SPADs) by using 0.18-mu m high-voltage CMOS technology. Without any technology customization. the SPADs have low dark-count rate, high photon-detection probability, low afterpulsing probability, and acceptable timing jitter and breakdown voltage. Our design provides a low-cost and high-performance SPAD for various applications. (C) 2017 Optical Society of America
Novel Class IIa-Selective Histone Deacetylase Inhibitors Discovered Using an in Silico Virtual Screening Approach
(2017-06-12)
Hsu, Kai-Cheng
;
Liu, Chang-Yi
;
Lin, Tony Eight
;
Hsieh, Jui-Hua
;
Sung, Tzu-Ying
Histone deacetylases (HDAC) contain eighteen isoforms that can be divided into four classes. Of these isoform enzymes, class IIa (containing HDAC4, 5, 7 and 9) target unique substrates, some of which are client proteins associated with epigenetic control. Class IIa HDACs are reportedly associated with some neuronal disorders, making HDACs therapeutic targets for treating neurodegenerative diseases. Additionally, some reported HDAC inhibitors contain hydroxamate moiety that chelates with zinc ion to become the cofactor of HDAC enzymes. However, the hydroxamate functional group is shown to cause undesirable effects and has poor pharmacokinetic profile. This study used in silico virtual screening methodology to identify several nonhydroxamate compounds, obtained from National Cancer Institute database, which potentially inhibited HDAC4. Comparisons of the enzyme inhibitory activity against a panel of HDAC isoforms revealed these compounds had strong inhibitory activity against class IIa HDACs, but weak inhibitory activity against class I HDACs. Further analysis revealed that a single residue affects the cavity size between class I and class IIa HDACs, thus contributing to the selectivity of HDAC inhibitors discovered in this study. The discovery of these inhibitors presents the possibility of developing new therapeutic treatments that can circumvent the problems seen in traditional hydroxamate-based drugs.
Operando X-ray spectroscopic observations of modulations of local atomic and electronic structures of color switching smart film
(2017-06-14)
Lu, Ying-Rui
;
Wu, Tzung-Zing
;
Chang, Han-Wei
;
Chen, Jeng-Lung
;
Chen, Chi-Liang
Smart windows, which change color in response to external stimuli, are extensively studied owing to their potential technological applications in sensors and their ability to reduce the energy consumed by buildings. Most related studies focus on the optical properties of smart color switching films that can control the transmission of light and that of heat independently. This study examines the vanadium pentoxide thin film as a model system of a color switchable window. A gasochromic thin film of V2O5 is fabricated using sol-gel spin coating. In operando soft X-ray absorption spectroscopy (XAS) at the V L-edge is used to determine the evolutions of the electronic and atomic structures of V2O5 thin film under gasochromic color switching. Analysis of the V K-edge with respect to crystalline structural symmetry and valence requires many reference samples, whereas the V L-edge, which involves V 3d orbitals of various symmetries, can provide information about the atomic/electronic structures without many reference samples. A new gas reaction in situ cell was developed to collect the total-electron-yield XAS. The total-electron-yield signal can provide more accurate information about atomic and electronic structures than can the fluorescence-yield signal, which typically exerts a saturation effect. Analytical results reveal that the gasochromic reaction changes the charge state and causes a local atomic structural deformation of the film. The suggestion has been made that in the reaction, the central vanadium atom within the octahedron moves closer to the basal plane such that the apical V-O bond becomes more symmetrical than the film before gasochromic coloration. Unlike the cell that is used for hard XAS, and for which only cation sites can be studied, this in situ gas cell enables the real-time studies of atomic/electronic structures at gas-solid interfaces from viewpoints of both cation and anion sites.
The preparation, and structural and multiferroic properties of B-site ordered double-perovskite Bi2FeMnO6
(2017-06-14)
Sun, Lin
;
Fang, Yue-Wen
;
He, Jun
;
Zhang, Yuanyuan
;
Qi, Ruijuan
We report the structural, magnetic, and ferroelectric properties of double-perovskite Bi2FeMnO6 in which Fe3+ and Mn3+ cations are present with alternative ordering along the [111] direction. High-flux synchrotron X-ray diffraction and high resolution transmission electron microscopy show that the pseudo-cubic lattice of Bi2FeMnO6 consists of alternatively corner-shared octahedra of FeO6 and MnO6. In the highly ordered Bi2FeMnO6 thin films, the unusual spin-glassy magnetic state is observed below 18 K by a superconducting quantum interference device, and this is ascribed to the magnetic frustration at the [111] Fe3+ and Mn3+ planes as indicated by X-ray magnetic circular dichroism measurements. Combining with the orbital model analysis based on Goodenough-Kanamori-Anderson rules, first-principles calculations and Monte Carlo simulations suggest that magnetic frustration is dominated by the long-range second nearest neighboring antiferromagnetic interactions of Fe3+-Fe3+ and Mn3+-Mn3+ and leads to the surprisingly weak magnetism. On the other hand, robust room-temperature ferroelectricity in Bi2FeMnO6 films is confirmed by piezoelectric force microscopy through electrically switching the polarization state and the ferroelectric retention.
Synthesis of diketopyrrolopyrrole based conjugated polymers containing thieno[3,2-b]thiophene flanking groups for high performance thin film transistors
(2017-06-14)
Peng, Shih-Hao
;
Tu, Wei-Yi
;
Gollavelli, Ganesh
;
Hsu, Chain-Shu
;
應用化學系
New donor-acceptor (D-A) conjugate polymers based on 3,6-bis(2-bromothieno-[3,2-b] thiophen-5-yl)2,5- bis(2-octyldodecyl) pyrrolo[3,4-c]-pyrrole-1,4-(2H, 5H)-dione (Br-TTDPP) combined with three different electron-donating monomers bithiophene (BT), di(2-thienyl) ethene (TVT), and di(selenophene2- yl) ethene (SVS) were synthesized. The optical band gap, electrochemical properties and organic fieldeffect transistor (OFET) device performance of the TTDPP-based polymers were systematically investigated. X-ray diffraction (XRD) was used to evaluate the molecular packing of the TTDPP-based polymers. Among three polymers, TTDPP-SVS showed the smallest d-spacing and the largest distance of 0.372 for pi-pi stacking. In particular, an OTFT having a TTDPP-SVS active layer showed the highest hole mobility of 0.196 cm(2) V-1 s(-1), the lowest threshold voltage down to -3.6 V, and the highest Ion/Ioff ratio of 6.5 x 10(4). This indicates that p-extended SVS significantly improves charge transport properties.
Selective solvent-induced reconstruction in confined space: one-dimensional mesoporous block copolymer structures in cylindrical nanopores
(2017-06-14)
Chang, Chun-Wei
;
Chi, Mu-Huan
;
Ko, Hao-Wen
;
Chu, Chien-Wei
;
Fang, Zhi-Xuan
We investigate the formation of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) nanostructures confined in cylindrical nanopores via a novel selective solvent-induced reconstruction process. The key factors of the morphologies of the nanostructures are determined, including the choice of solvents, the molecular weights of the polymers, and the pore diameters of the templates.
Influence of plasma fluorination on p-type channel tin-oxide thin film transistors
(2017-06-15)
Chen, Po-Chun
;
Chiu, Yu-Chien
;
Zheng, Zhi-Wei
;
Cheng, Chun-Hu
;
Wu, Yung-Hsien
This paper describes a high-performance p-type tin-oxide (SnO) thin film transistor (TFT) using fluorine plasma treatment on the SnO active channel layer. The influence of fluorine plasma treatment for this p-type SnO TFT device was also investigated. Through tuning the fluorine plasma power treated on the SnO active channel layer at low temperature, the optimal p-type SnO TFT device exhibits a very high on/off current ratio of 9.6 x 10(6), a field-effect mobility of 2.13 cm(2) V-1 s(-1), a very low subthreshold swing of 106 mV/dec and an extremely low off-state current of 1 pA at a low driven voltage of <3 V. These good characteristics can be attributed to fluorine plasma treatment on p-type SnO channel that reduced crystallized channel roughness and passivated oxygen vacancies and interface traps. This high-performance p-type SnO TFT device using fluorine plasma treatment on the active channel shows great promise for future high-resolution and high-speed display applications. (C) 2016 Elsevier B.V. All rights reserved.
從語言學觀察商標淡化──論產地證明標章之立法妥適性
(交通大學科技法律學院（原名稱：交通大學科技法律研究所）, 2017-06-15)
陳思宇
;
Si-Yu Chen
任何能夠傳遞資訊的載體皆可視為符號，文字、語言、標章皆屬之。本文以「產地證明標章」為中心，分析我國自2011 年商標法修法後，於條文設計上多「依其性質準用」一般商標的規定。基於產地證明標章在各方面皆異於一般商標，因此，在商標侵權態樣之一──淡化（dilution）之規定上，產生準用之困難。本文從產地證明標章之意義、功能為起點，透過 Saussure 符號學分析傳統混淆誤認規範與商標淡化間所侵害之法益有何不同，並提出構成「商標淡化」之要件為何。惟我國實務對於構成商標淡化之要件看法分歧，原因在於對商標淡化保護之法益模糊不清。本文透過語言學上轉喻（metonymy）分析淡化所保護之法益，提出產地證明標章應無一般商標淡化規定之適用，並在最後以經濟學上外部性（externality）之角度，在商標法架構下提出修法建議。
A rapid responding ultraviolet sensor based on multi-parallel aligned ZnO nanowires field effect transistor
(2017-06-15)
Tiong, Teck-Yaw
;
Dee, Chang-Fu
;
Hamzah, Azrul Azlan
;
Goh, Boon Tong
;
Wong, Yuan-Yee
One-dimensional zinc oxide nanowires (ZnO NWs) have been reported to be suitable for UV sensing, but their applications are limited due to restricted surface area which restrains the performance especially in term of response and recovery. In this paper, we fabricate a UV sensor using multi-parallel aligned ZnO NWs based FET in order to overcome the mentioned drawbacks. The sensing characteristics of multi parallel aligned ZnO NWs based FET toward 0.44 mW/cm(2) UV illumination has been examined under depletion and enhancement modes, at ambient conditions. The fabricated UV sensor was found to possess the ability to differentiate UV with different intensity, improved sensitivity (in depletion mode), short response and recovery time (< 1 s), and with high stability. Our paper reports a simple and effective approach for UV sensor fabrication with high responsivity, sensitivity and reproducibility. (C) 2017 Elsevier B.V. All rights reserved.
BRIGHTNESS COMPENSATION CIRCUITRY, AND DISPLAY DEVICE INCLUDING THE SAME
(2017-06-15)
Ya-Hsiang TAI
;
Xuan-Yong LIN
;
Chun-Yi CHANG
A brightness compensation circuitry includes a data-setting switch unit receiving a data-setting signal, a pixel unit including a pixel driving circuit that receives the data-setting signal during a data-input period to generate a driving current, and a compensation circuit receiving the driving current generated by the pixel driving circuit. The compensation circuit controls the data-setting switch unit to conduct or not conduct by determining whether or not a magnitude of the driving current conforms with a criterion that is associated with target brightness of the pixel unit.
風險溝通在食安管理中之必要性：以狂牛症事件為例
(交通大學科技法律學院（原名稱：交通大學科技法律研究所）, 2017-06-15)
許耀明
;
譚偉恩
;
Yao-Ming Hsu
;
Wei-En Tan
「風險溝通」強調利害關係人之間水平式的對話與資訊交換，其目的是為了使食安管理措施更為周延並符合審議式民主的需求。然而，將風險溝通納入食安管理，會不會對科學專業的判斷或政府管理工作的進行產生妨礙？此問題的背後至少包含了兩個值得細究但一直存有爭論的議題：1.風險溝通是否有助於治理食安問題，以致於具有重要性而必須被重視？2.風險溝通是否僅對消費者有利，但卻不利於食品業者或供應方，甚至會增加政府行政上的成本？本文認為，從風險管理的角度觀之，風險溝通能夠將消費者的真實需求或憂慮融入到食品安全的管理政策中。此種治理機制符合民主政治對於問責性的要求，讓風險承擔者知曉在與其自身利害相關之食安法制中究竟存有什麼風險，以及這些風險可能為自己帶來的利弊得失。當制度上利害關係人皆能獲得充分資訊時，其風險承擔或風險迴避的能力將隨之獲得提升，此結果對於食品市場的交易秩序將具有正面裨益，亦有益於政府食安管理目標之達成。