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銀與二氧化鈦奈米複合材料之新穎製程開發與光電性質研究 = Novel s...

國立高雄大學化學工程及材料工程學系碩士班

銀與二氧化鈦奈米複合材料之新穎製程開發與光電性質研究 = Novel synthesis and popto-electric properties of Ag/TiO2 nanocomposites

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Novel synthesis and popto-electric properties of Ag/TiO2 nanocomposites
作者:	高永祥,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2009[民98]
面頁冊數:	107面圖、表 : 30公分;
標題:	光致變色
標題:	Ag nanoplates
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/57496748781186828398
附註:	指導教授：王瑞琪
附註:	參考書目：面
摘要註:	本研究首次以硝酸銀為原料，用低溫乾式之熱化學氣相沉積法製備銀奈米粒子、銀奈米柱與銀奈米片於二氧化鈦薄膜及矽基板上。透過X-ray diffraction (XRD)分析觀察銀結晶結構沉積在基板上並無其他的不純物殘留，掃描式電子顯微鏡 (SEM)與穿透式電子顯微鏡(TEM)實驗得知銀奈米粒子結晶結構為面心立方結構，而粒子之平均粒徑隨沉積位置離蒸鍍源距離增加，平均粒徑從80nm縮減至10nm。而TEM分析可知銀奈米柱觀察可知直徑約20nm，長度約100nm，朝<110>方向成長。此外，奈米銀之形貌也可以藉由改變工作壓力與基板形貌改變，隨著工作壓力增加，粒子的粒徑從20nm增至100nm外，也有一些片狀結構出現。不同基板時，銀沉積於銳鈦礦相的二氧化鈦薄膜之形貌為銀奈米線，而沉積於銳鈦礦相金紅石相時為銀奈米片，而在矽基板上則呈奈米粒子。經由拉曼光譜我們首次發現銀奈米粒子可以有效增益半導體基板的拉曼散射，而且增加的強度隨粒徑的減少而增加，這應可歸因於銀表面電漿共振的熱點（hot spots）增加所致。此外，經由銀奈米粒子的表面電漿增益後，微量的二氧化鈦Brookite相亦可於二氧化鈦銳鈦礦相被偵測到。此結果顯示了表面電漿拉曼散射於偵測微量且重要半導體特性的新應用。再者，這些銀-二氧化鈦奈米複合材料也於紫外線與藍光的照射下顯現出明顯的光致變色特性，顯示了其在光致變色玻璃及光儲存材料之應用。 A low-temperature dry-process was proposed to synthesize silver nanoparticles, nanorods, and nanoplates on TiO2 films and silver nanoparticles on Si via thermal decomposition of silver nitride. X-ray diffraction (XRD) shows only silver crystals were synthesized on the substrate without other byproducts remained. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) reveal the Ag nanoparticles are single-crystalline face-centered cubic (FCC) structures and their average diameters decrease from 80 nm to 10 nm with the increases of the distance from the source, which corresponds to a decrease of substrate temperature from 350 to 110℃. The Ag nanorods are also single-crystalline FCC structures growing along the [110] direction with diameter and length around 20 and 100 nm, respectively. The morphology of silver nanostructures could be adjusted by varying working pressure as well as roughness of the substrates. Raman spectra show the silver nanoparticles enhance the Raman scattering of the semiconductor substrates below for the first time, and the enhancement factor increases as the size of Ag nanoparticles decrease, which is attributed to the increase of hot spots. Besides, tiny brookite in the anatase films could be detected only after being loaded with Ag nanoparticles, which demonstrates the application of SERS in detecting tiny and important features of semiconductors.On the other hand, the color of Ag/TiO2 nanocomposites, initially brownish changes, under a visible light to colorless and reverts to brownish under UV light. The Ag/TiO2 nanocomposites with distinct morphologies and photochromic behaviors are promising for optical sensing applications.

銀與二氧化鈦奈米複合材料之新穎製程開發與光電性質研究 = Novel synthesis and popto-electric properties of Ag/TiO2 nanocomposites
高, 永祥

銀與二氧化鈦奈米複合材料之新穎製程開發與光電性質研究 = Novel synthesis and popto-electric properties of Ag/TiO2 nanocomposites / 高永祥撰 - [高雄市] : 撰者, 2009[民98]. - 107面 ; 圖、表 ; 30公分.
指導教授：王瑞琪參考書目：面.
光致變色Ag nanoplates

銀與二氧化鈦奈米複合材料之新穎製程開發與光電性質研究 = Novel synthesis and popto-electric properties of Ag/TiO2 nanocomposites
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