Browsing by Issue Date, starting with "2019-07-24"

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Large-Area and Strain-Reduced Two-Dimensional Molybdenum Disulfide Monolayer Emitters on a Three-Dimensional Substrate
(2019-07-24)
Chang, Chiao-Yun
;
Lin, Hsiang-Ting
;
Lai, Ming-Sheng
;
Yu, Cheng-Li
;
Wu, Chong-Rong
Atomically thin membranes of two-dimensional (2-D) transition-metal dichalcogenides (TMDCs) have distinct emission properties, which can be utilized for realizing ultrathin optoelectronic integrated systems in the future. Growing a large-area and strain-reduced monolayer 2-D material on a three-dimensional (3-D) substrate with microstructures or nanostructures is a crucial technique because the electronic band structure of TMDC atomic layers is strongly affected by the number of stacked layers and strain. In this study, a large-area and strain-reduced MoS2 monolayer was fabricated on a 3D substrate through a two-step growth procedure. The material characteristics and optical properties of monolayer TMDCs fabricated on the nonplanar substrate were examined. The growth of monolayer MoS2 on a cone-shaped sapphire substrate effectively reduced the tensile strain induced by the substrate by decreasing the thermal expansion mismatch between the 2-D material and the substrate. Monolayer MoS2 grown on the nonplanar substrate exhibited uniform strain reduction and luminescence intensity. The fabrication of monolayer MoS2 on a nonplanar substrate increased the light extraction efficiency. In the future, large-area and strain-reduced 2-D TMDC materials grown on a nonplanar substrate can be employed as novel light-emitting devices for applications in lighting, communication, and displays for the development of ultrathin optoelectronic integrated systems.
Oxide Heteroepitaxy-Based Flexible Ferroelectric Transistor
(2019-07-24)
Tsai, Meng-Fu
;
Jiang, Jie
;
Shao, Pao-Wen
;
Lai, Yu-Hong
;
Chen, Jhih-Wei
With the rise of Internet of Things, the presence of flexible devices has attracted significant attention owing to design flexibility. A ferroelectric field-effect transistor (FeFET), showing the advantages of high speed, nondestructive readout, and low-power consumption, plays a key role in next-generation technology. However, the performance of these devices is restricted since conventional flexible substrates show poor thermal stability to integrate traditional ferroelectric materials, limiting the compatibility of wearable devices. In this study, we adopt flexible muscovite mica as a substrate due to its good thermal properties and epitaxial integration ability. A flexible FeFET composed of oxide heteroepitaxy on muscovite is realized by combining an aluminum-doped zinc oxide film as the semiconductor channel layer and a Pb(Zro7Ti0.3)03 film as the ferroelectric gate dielectric. The excellent characteristics of the transistor together with superior thermal stability and mechanical flexibility are demonstrated through various mechanical bending and temperature measurements. The on/off current ratio of the FeFET is higher than 103, which based on the field effect in the transfer curve. The smallest bending radius that can be achieved is 5 mm with a cyclability of 300 times and a retention of 100 h. This study opens an avenue to use oxide heteroepitaxy to construct a FeFET for next-generation flexible electronic systems.
Hydrogen Abstraction/Addition Tunneling Reactions Elucidate the Interstellar H2NCHO/HNCO Ratio and H-2 Formation
(2019-07-24)
Haupa, Karolina A.
;
Tarczay, Gyorgy
;
Lee, Yuan-Pern
;
交大名義發表
;
應用化學系
Formamide (H2NCHO) is the smallest molecule possessing the biologically important amide bond. Recent interstellar observations have shown a strong correlation between the abundance of formamide and isocyanic acid (HNCO), indicating that they are likely to be chemically related, but no experiment or theory explains this correlation satisfactorily. We performed H + H2NCHO reactions in a para-hydrogen quantum-solid matrix host and identified production of H2NCHO and HNCO from hydrogen-abstraction reactions. We identified also D2NCO, DNCO, HDNCO, and HDNCHO from the reaction H + D2NCHO, indicating the presence of hydrogen-addition reactions of DNCO and HDNCO. From the observed temporal profiles of H2NCHO, H2NCO, HNCO, and their deuterium isotopologues, we showed that a dual-cycle consisting of hydrogen abstraction and hydrogen addition can satisfactorily explain the quasi-equilibrium between H2NCHO and HNCO and explain other previous experimental results. Furthermore, this mechanism also indicates that the catalytic formation of H-2 from H atoms might occur in interstellar ice grains.
【108年動物中心使用說明會】
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
Infrared Emission from Photodissociation of Methyl Formate [HC(O)OCH3] at 248 and 193 nm: Absence of Roaming Signature
(2019-07-25)
Lanfri, Lucia Y.
;
Wang, Yen-Lin
;
Pham, Tien V.
;
Nghia Trong Nguyen
;
Paci, Maxi Burgos
Following photodissociation at 248 nm of gaseous methyl formate (HC(O)OCH3, 0.73 Torr) and Ar (0.14 Torr), temporally resolved vibration-rotational emission spectra of highly internally excited CO (nu <= 11, J <= 27) in the 1850-2250 cm(-1) region were recorded with a step-scan Fourier-transform spectrometer. The vibration-rotational distribution of CO is almost Boltzmann, with a nascent average rotational energy (E-R(0)) of 3 +/- 1 kJ mol(-1) and a vibrational energy (E-v(0)) of 76 +/- 9 kJ mol(-1). With 3 Torr of Ar added to the system, the average vibrational energy was decreased to E-v(0) = 61 +/- 7 kJ mol(-1). We observed no distinct evidence of a bimodal rotational distribution for nu = 1 and 2, as reported previously [Lombardi et al., J. Phys. Chem. A 2016, 129, 5155], as evidence of a roaming mechanism. The vibrational distribution with a temperature of similar to 13000 +/- 1000 K, however, agrees satisfactorily with trajectory calculations of these authors, who took into account conical intersections from the S-1 state. Highly internally excited CH3OH that is expected to be produced from a roaming mechanism was unobserved. Following photodissociation at 193 nm of gaseous HC(O)OCH3 (0.42 Torr) and Ar (0.09 Torr), vibration-rotational emission spectra of CO (nu <= 4, J <= 38) and CO2 (with two components of varied internal distributions) were observed, indicating that new channels are open. Quantum-chemical calculations, computed at varied levels of theory, on the ground electronic potential-energy schemes provide a possible explanation for some of our observations. At 193 nm, the CO2 was produced from secondary dissociation of the products HC(O)O and CH3OCO, and CO was produced primarily from secondary dissociation of the product HCO produced on the S-1 surface or the decomposition to CH3OH + CO on the S-0 surface.
第九屆海峽兩岸醫學生交流活動
(國立陽明大學, 2019-07-25)
湯于萱
;
陽明電子報編輯小組
海峽兩岸醫學生交流活動，是一年一度為兩岸醫學生搭起的學術與文化交流活動，參加成員包括：北京大學醫學部、陽明大學、高雄醫學大學、中國醫藥大學與台灣大學醫學院。來自北京與台灣各地的醫學生在本活動相遇，分享彼此的所思、所學、所想；在學術上激盪出嶄新的思維，在文化上認識彼此的歷史故事與人生閱歷。
【學生餐廳8/31前暫停營業】
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
Enhanced photovoltaic performance of dye-sensitized solar cells by the adsorption of Zn-porphyrin dye molecule on TiO2 surfaces
(2019-07-25)
Lin, Yanming
;
Zhu, Chaoyuan
;
Jiang, Zhenyi
;
Zhao, Yali
;
Wang, Qi
The electronic structure, optical absorption and charge transfer performances of Zn-porphyrin (ZnPP) dye molecule adsorbed on anatase (101) and rutile (110) TiO2 surfaces have been investigated systematically using spin-polarized density functional theory calculations. The calculated results indicate that the strong interactions of ZnPP dye molecule and TiO2 surfaces cause an obvious variation of the conduction band minimum and valence band maximum for ZnPP dye molecule adsorbed on TiO2 surfaces, and the valence band of adsorption systems has a large bandwidth compared with that of the TiO2 bulk and surfaces, which induces a red-shift of the optical absorption edge and improves greatly the optical absorption of adsorption systems in the ultraviolet and visible light regions. Moreover, the change of charge density indicates that the photoelectrons transfer from the ZnPP dye molecule to TiO2 across the interface, and a built-in electric field is formed at the interface, which effectively enhances the separation of photogenerated electron-hole pairs. These results suggest that the sensitized actions of ZnPP dye molecule on TiO2 surfaces can generate an excellent photovoltaic performance of TiO2 photoanode in DSSCs. (c) 2019 Elsevier B.V. All rights reserved.
【生技醫療創新創業講座】～公司形象、議題設定與媒體風向
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
【108年實驗動物基本技術操作技能】
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
【108年暑期課程】個人電腦的安全防護
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
【2019畢業校友現況調查】102、104、106學年度畢業校友～填問卷三重好禮等著你！！！
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
2019北美費城生技展，陽明GLORIA團隊大放異彩
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
全球生技界每年最大產業活動──北美生技展（Bio International Convention），2019年6月在美國東岸費城盛大展開。陽明國際產學...
擺渡人
(國立陽明大學, 2019-07-25)
薛元智
;
陽明電子報編輯小組
亞洲首台小動物二合一影像儀落腳榮陽，加速新藥研發流程
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
高階醫療科技的正子與磁振二合一影像，現在小動物也可以做了。陽明採購市值超過一億的「小動物7T正子暨核磁共振影像儀」（7T micr...
Experiments for suitability of plastic heat exchangers for dehumidification applications
(2019-07-25)
Amer, Mohammed
;
Chen, Miao-Ru
;
Sajjad, Uzair
;
Ali, Hafiz Muhammad
;
Abbas, Naseem
The present study conducted a series of experiments concerning the condensation of humid air used in a typical adsorption dehumidifier. The experiments were carried out with the standard ambient condition (27 degrees C dry bulb temperature and 21.2 degrees C wet bulb temperature) for the cold side. Yet the regeneration side (hot side) inlet temperature is 55 degrees C with RH% being 100%. Three novel plastic heat exchangers (plate plastic heat exchanger-PHX, bare tube plastic heat exchanger with asymmetry tube layout-BTHX, and round tube plastic heat exchanger with uniform tube layout-RTHX) were tested and compared experimentally. Test results, in terms of heat flux or heat transfer coefficient, show that the BTHX is superior to RTHX and PHX for offering additional condensate splashing mode. The splashing feature is especially beneficial for larger cold side flow rate since the plateau of heat transfer performance is moved toward larger cold side flow rate regime. The asymmetry tube geometry design (BTHX) shows even better heat transfer performance than the uniform tube bundle design (RTHX) for providing more space at the downstream of the tube bundle.
蔡金吾老師榮獲「2019中研院年輕學者研究著作獎」
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
近年來在大腦發育調控機制研究卓越有成的蔡金吾副教授，以三篇在國際知名雜誌發表的傑出論文，榮獲今年「中央研究院年輕學者研究...
【IRB教育訓練】醫療器材法規與管理制度簡介
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
東南亞學者齊聚陽明，分享各國傳統醫藥發展
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
「2019東南亞傳統醫學國際研討會」7月13日至14日於陽明盛大舉辦，包含馬來西亞、新加坡、泰國、越南、菲律賓、印尼，與印度的傳統...
醫技系簡婉如同學榮獲科技部「107年度大專學生研究創作獎」
(國立陽明大學, 2019-07-25)
陽明電子報編輯小組
今年6月剛從醫技系畢業的簡婉如同學，在大三時由生理學研究所吳鈺琳教授指導，參加科技部「107年度大專學生研究計畫」，以研究題...