Browsing by Issue Date, starting with "2019-10-23"

Now showing 1 - 20 of 6620

Scaling down of cobalt quantum-dots by colloidal route for non-volatile memory device application
(2019-10-23)
Yadav, Manoj
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Velampati, Ravi Shankar R.
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Mandal, Debaprasad
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
The present work details the synthesis of cobalt quantum-dots (Co QDs) with size downscaling to 1-2 nm and their applications in non-volatile memory (NVM) devices. The process of colloidal synthesis is simple and provides the control over a wide range of QDs size. The scaled-down colloidal Co QDs are applied for the NVM device fabrication. Colloidal synthesised Co QDs are spin-coated over silicon dioxide wafer for the fabrication of floating-gate NVM devices. Capacitance-voltage (C-V) and capacitance-time (C-t) measurements of the fabricated NVM device indicate a low voltage operation of device. A sweep voltages as small as 1.2-4 V lead to a flat band voltage shift of 0.35-1.5 V, evidencing the low operating voltage and low power NVM applications. Further, retention characteristics show a robust retention by fabricated NVM device. In addition, C-V measurements are done for the several samples in order to study the process repeatability. The work also is compared with the other processes for the floating gate memory device.
Sandwich-Nanostructured n-Cu2O/AuAg/p-Cu2O Photocathode with Highly Positive Onset Potential for Improved Water Reduction
(2019-10-23)
Lin, Yu-Chang
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Hsu, Liang-Ching
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Lin, Chia-Yu
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Chiang, Chao-Lung
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Chou, Che-Min
An n-Cu2O layer formed a high-quality buried junction with p-Cu2O to increase the photovoltage and thus to shift the turn-on voltage positively. Mott-Schottky measurements confirmed that the improvement benefited from a positive shift in flat-band potential. The obtained extremely positive onset potential, 0.8 V-RHE in n-Cu2O/AuAg/p-Cu2O, is comparable with measurements from water reduction catalysts. The AuAg alloy sandwiched between the homo-junction of n-Cu2O and p-Cu2O improved the photocatalytic performance. This alloy both served as an electron relay and promoted electron-hole pair generation in nearby semiconductors; the charge transfer between n-Cu2O and p-Cu2O in the sandwich structure was measured with X-ray absorption spectra. The proposed sandwich structure can be considered as a new direction for the design of efficient solar-related devices.
Two-Dimensional Cobalt Phosphate Hydroxide Nanosheets: A New Type of High-Performance Electrocatalysts with Intrinsic CoO6 Lattice Distortion for Water Oxidation
(2019-10-23)
Bu, Xiuming
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Chiang, ChaoLung
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Wei, Renjie
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Li, Zebiao
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Meng, You
Despite the recent advances in electrochemical water splitting, developing cost-effective and highly efficient electrocatalysts for oxygen evolution reaction (OER) still remains a substantial challenge. Herein, two-dimensional cobalt phosphate hydroxides (Co-5(PO4)(2)(OH)(4)) nanosheets, a unique stacking-disordered phosphate-based inorganic material, are successfully prepared via a facile and scalable method for the first time to serve as a superior and robust electrocatalyst for water oxidation. On the basis of the detailed characterization (e.g., X-ray absorption near-edge structure and X-ray photoelectron spectroscopy), the obtained nanosheets consist of special zigzag CoO6 octahedral chains along with intrinsic lattice distortion and excellent hydrophilicity, in which these factors contribute to the highly efficient performance of prepared electrocatalysts for OER. Specifically, (Co-5(PO4)(2)(OH)(4)) deposited on glassy carbon electrode (loading amount approximate to 0.553 mg cm -2 ) can exhibit an unprecedented overpotential of 254 mV to drive a current density of 10 mA cm(-2) with a small Tafel slope of 57 mV dec(-1) in alkaline electrolytes, which outperforms the ones of CO3(PO4)(2)(370 mV) and Co(OH)(2) (360 mV) as well as other advanced catalysts. Evidently, this work has opened a new pathway to the rational design of promising metal phosphate hydroxides toward the efficient electrochemical energy conversion.
Optical Control of Hole Wavefunction in Type-II Magnetic Quantum Dot Structures
(2019-10-24)
Zhang, Peiyao
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Norden, Tenzin
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Pientka, James M.
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Oszwaldowski, Rafal
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Najafi, Arman
Unlike the extensively studied, spatially direct, quantum dots (QDs) with type-I band alignment where both electrons and holes are confined in the QD, in ZnTe QDs embedded in a (Zn,Mn)Se matrix only the holes are confined in the QDs. This spatially indirect type-II system provides unexplored opportunities to control the magnetic interactions between the hole spins in the nonmagnetic QDs and the spins of the magnetic ions in the matrix. Photoluminescence (PL) was excited either with photons of energy 3.06 eV [above band gap of the (Zn,Mn)Se matrix] or with photons of energy 2.54 eV [below the (Zn,Mn)Se band gap]. In the presence of an external magnetic field, the saturation red shift of the PL peak under 2.54 eV excitation exhibits an up to three-fold increase compared to the shift observed with 3.06 eV excitation. This increase is attributed to multiple hole occupancy of the QDs and the resulting increased penetration of the hole wavefunction tail further into the (Zn,Mn)Se matrix. The proposed model is supported by calculations which include the hole-hole Coulomb interactions as well as the hole-Mn spin exchange interactions.
Highly Plasmonic Titanium Nitride by Room-Temperature Sputtering
(2019-10-25)
Chang, Chun-Chieh
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Nogan, John
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Yang, Zu-Po
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Kort-Kamp, Wilton J. M.
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Ross, Willard
Titanium nitride (TiN) has recently emerged as an attractive alternative material for plasmonics. However, the typical high-temperature deposition of plasmonic TiN using either sputtering or atomic layer deposition has greatly limited its potential applications and prevented its integration into existing CMOS device architectures. Here, we demonstrate highly plasmonic TiN thin films and nanostructures by a room-temperature, low-power, and bias-free reactive sputtering process. We investigate the optical properties of the TiN films and their dependence on the sputtering conditions and substrate materials. We find that our TiN possesses one of the largest negative values of the real part of the dielectric function as compared to all other plasmonic TiN films reported to date. Two-dimensional periodic arrays of TiN nanodisks are then fabricated, from which we validate that strong plasmonic resonances are supported. Our room-temperature deposition process can allow for fabricating complex plasmonic TiN nanostructures and be integrated into the fabrication of existing CMOS-based photonic devices to enhance their performance and functionalities.
運用想像力減少悲傷的負面效果
(2019-10-27)
曾弘碩
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Department of Communication and Technology
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傳播與科技學系
當我們遇到悲傷的事情後，常常會做出自暴自棄的舉動。比如：失戀後暴飲暴食來減少痛苦。研究發現，原來把悲傷擬人化，會降低悲傷帶來的負面效果。
一眼看穿你！從消費習慣看你的性格
(2019-10-27)
馬鈺絜
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Department of Communication and Technology
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傳播與科技學系
每個人都有不同的個性特徵，會不自覺地在生活中表現出來。你知道嗎？連消費習慣都可以反映人格特質，你有想到類似的例子嗎？
虐你千百遍，你待「減重」如初戀？
(2019-10-27)
黃心姵
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Department of Communication and Technology
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傳播與科技學系
人常在「食」無忌憚後，立志好好減肥，但你想過造成人們「食」無忌憚背後的原因嗎？多項研究結果指出可能暴飲暴食的原因，也找到可以幫助燃燒脂肪的關鍵基因，並提供新奇的方式來增加卡路里的消耗。
看似「高冷」的貓，其實會與人類產生依附關係
(2019-10-27)
蕭蕙崎
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Department of Communication and Technology
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傳播與科技學系
儘管大多數的貓，似乎不太喜歡與人接觸，但跟據發表於《當代生物學》29期的研究顯示，貓咪會與飼主發展出與人類相同的依附關係，其實貓咪的社交認知力比你想像的要高上許多。
總編的話
(2019-10-27)
吳宥芯
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Department of Communication and Technology
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傳播與科技學系
本期為喀報321期，共計13篇文章，包含三篇社會議題、七篇科技新知、四篇藝文評論。本篇頭題為陳炘瑜的〈宮鬥禁不禁〉，文章分析今年熱度飆漲的宮鬥劇、手遊等，於中國慘遭禁播的風波，去深入探討。
《哪吒之魔童轉世》不信所謂的命中注定
(2019-10-27)
李金福
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Department of Communication and Technology
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傳播與科技學系
歐美那邊有「漫威宇宙」，中國則欲打造「封神宇宙」；《哪吒之魔童轉世》口碑和票房雙雙爆棚，榮登中國內地電影史票房第二名，究竟是什麼原因讓中國內地冷門類型的動畫片突然爆紅？
當自閉《證人》成了唯一目擊者，你會選擇相信嗎？
(2019-10-27)
李旻珊
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Department of Communication and Technology
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傳播與科技學系
當自閉症的孩子是唯一的證人，不被相信，卻是最值得信任的人。
沉默的告別自殺者遺族的心態與關懷
(2019-10-27)
曾冠霖
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Department of Communication and Technology
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傳播與科技學系
自殺，是一種選擇；自殺者遺族，卻無從選擇。活著的人，該如何面對社會的偏見與誤解，又該如何從痛苦的情緒中重新站起？
宮鬥禁不禁？
(2019-10-27)
陳炘瑜
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Department of Communication and Technology
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傳播與科技學系
宮鬥劇的禁播議題在今年頗受關注，而造成禁播背後的原因與影響到底為何？其中又牽扯哪些面向？如果不禁播，又會形成怎樣的現象？本文將帶你一探究竟。
香港年輕人的吶喊：從地下樂團到獨立樂團
(2019-10-27)
詹庭瑄
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周容萱
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Department of Communication and Technology
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傳播與科技學系
台灣的獨立樂團在近十年內猛然崛起，而香港的獨立樂團也從地下樂團逐漸走出外面的世界，他們的努力，在到處開啟了獨立樂團的花。
神秘歌姬—「?te壞特」用音樂買醉
(2019-10-27)
林怡恩
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Department of Communication and Technology
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傳播與科技學系
「?te壞特」用迷幻出世的嗓音，搭配微醺心醉的Lo-Fi曲風，僅用三首歌曲便震撼了近期台灣獨立音樂圈，為華語樂壇注入一股新的力量。
寂寞的邊緣人請小心！研究顯示孤單比肥胖更不健康
(2019-10-27)
徐曼寧
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Department of Communication and Technology
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傳播與科技學系
孤獨不再只是一種情緒，近年來越來越多研究發現，孤獨對人體危害極大。其中又以「老年孤獨」最為各國矚目。即將邁入超高齡社會的台灣，該如何解決「老年孤獨」？
檢視善惡？舞台劇《悲慘世界》唱出的是愛
(2019-10-27)
石恩亞
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Department of Communication and Technology
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傳播與科技學系
電影《悲慘世界》改編自法國大文豪雨果的作品《孤星淚》，在2012年上映時獲得全球極大迴響。然而，從1980年起，《悲慘世界》的音樂劇就開始在舞台上演出，舞台劇傳出的能量與歌聲，直到近40年後的2019年，依然生生不息。而大眾所不知道的是，這齣講述悲慘遭遇的戲劇，其核心價值其實「愛」。
毛小孩越「演」越惹人愛
(2019-10-27)
鄧萱妤
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Department of Communication and Technology
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傳播與科技學系
英國科學家 Juliane Kaminski 在2019年6月發表的一篇研究中，提出「狗狗的大眼睛可能是因為受人類喜愛，而逐漸演化出來的結果」之假說，並從解剖學及生物學的角度，解說為何提出此觀點。其研究中，針對挑眉行為造成肌肉組織發達的改變，以及狗狗與人類互動下可能被影響的原因進行解釋。
心想事成？腦機系統幫你圓夢
(2019-10-27)
沈品妤
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Department of Communication and Technology
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傳播與科技學系
神經與腦科學的科學家在過去３０年以來，一直都致力於開發腦機系統，讓人們可以通過腦中的意志來操控機械設備，甚至完成一些精密操作。而近年來許多研究也慢慢開花結果，本篇文章將介紹在醫療與科技方面的腦機系統新研究成果，進而一窺未來的腦機系統發展。