5/13專題演講公告

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上層分類：系所公告

分類：演講

建立於 2013-05-07, 週二 00:55

最近更新於 2013-10-23, 週三 17:00

發佈於：2013-05-07, 週二 16:55

點擊數：1346

日期：2013/05/13（星期一）
時間：自10時20分至12時10分
演講地點(地址)：工綜館B03

日期：2013/05/13（星期一）
時間：自10時20分至12時10分
演講地點(地址)：工綜館B03
演講者：翁明壽 教授
演講者服務單位：國立東華大學材料科學與工程學系

演講題目：
Preparation and characterization of multifunctional thin films of vapor-deposited titanium oxides and related materials

摘要:
As a versatile multifunctional material, titania (TiO2) and related materials have emerged as one of the most fascinating materials in the modern era, capturing the attention of scientists and engineers in exploring distinctive properties for promising applications. The applications range from photovoltaics, photocatalysis, photo-/electrochromics, transparent conducing oxide, sensors to ferromagnetism. Titania (anatase) is the best photocatalyst under UV light irradiation and is also the best photo-anode in dye-sensitized solar cells (DSSC); when doped with Nb or other elements, it becomes a promising transparent conducting oxide (TCO) and a ferromagnetic material for dilute magnetic semiconductor (DMS). To explore their novel properties and applications, various innovative processing methods have been used to prepare many new titania based materials of different composition, phase, crystallinity, structures or forms, including pure TiO2, anion- and cation-doped TiO2, and sculptured mesoporous titania.
Materials such as pristine and doped ZnO, SnO2, In2O3 and TiO2 have been investigated on the development of room-temperature ferromagnetism (RTFM) during the past decade, but the microscopic mechanism of long-range order magnetic behavior for the oxides is still an open problem. RTFM is observed in annealed pure TiO2 and various transition metal doped titania including niobium doped titania (TNO) thin films. Both the as-deposited amorphous films were amorphous and only when annealed under specific window of conditions, they became ferromagnetic with saturation magnetization (Ms) up to~60 emu/cm3. The values of Ms are affected by film thickness, annealing temperature, atmosphere and time, dopant, etc. For the films exhibited the maximum Ms value in a series of films, their XRD, XPS and Raman spectra, morphology, grain size are significantly different from the rest of films and the difference could be caused by oxygen vacancies and by quantum size effects. The results demonstrated that the RTFM in the titania films are affected primarily by the interfaces between the nano-grains with sizes comparable to quantum dots and secondarily by the oxygen vacancies.

學歷
畢業學校	國別	主修學門系所	學位
Marquette University	美國	材料科學及冶金	Ph.D
Marquette University	美國	材料科學及冶金	M.S.
國立清華大學	台灣	Materials	B.S.
經歷：
服務機關	服務部門	職稱
國立東華大學	理工學院	院長	國立東華大學
Northwestern University	Dept. of Materials Sci.& Eng.	Visiting Professor	Northwestern University
國立東華大學	材料科學與工程學系	教授兼系主任	國立東華大學
國立東華大學	材料科學與工程學研究所	教授兼所長	國立東華大學
Northwestern University	BIRL Industrial Research Lab.	Sr. Scientist	Northwestern University
Prog. Manager			Prog. Manager
Northwestern University	Materials Res. Center & Dept. MSE	Protdoc	Northwestern University
Marquette University	Materials Science Program	TA/RA	Marquette University