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Ta2O5.nH2O及Ta2O5之合成及形成機制和光致螢光之研究 = S...

國立高雄大學應用化學系碩士班

Ta2O5.nH2O及Ta2O5之合成及形成機制和光致螢光之研究 = Synthesis, application and their mechanism of the oxides and oxyhydrates of tantalum

Record Type:	Language materials, printed : monographic
Paralel Title:	Synthesis, application and their mechanism of the oxides and oxyhydrates of tantalum
Author:	林詠翔,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	2011[民100]
Description:	115面圖，表 : 30公分;
Subject:	五氧化二鉭
Subject:	Tantalum(V) oxide
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/45701471131772033222
Notes:	參考書目：面98-102
Notes:	103年12月16日公開
Summary:	五氧化二鉭(Tantalum(V) oxide, Ta2O5) 具有許多物理和化學的特性，可作為光觸媒材料、抗反射材料和抗腐蝕材料。且其具有高介電常數，使應用於半導體元件中。本研究捨棄常見之溶膠凝膠法，改以沉澱法合成Ta2O5粉末。以TaCl5及Na2O2為起始物，甲醇為溶劑，製備出”Ta2O5前驅物”，再經由傳統及固態微波兩種不同熱處理方式得到產物Ta2O5或Ta2O5•nH2O。同時也直接將Ta2O5前驅物經由搭配微波反應合成出Ta2O5。本研究中利用X-ray繞射分析儀、傅立葉轉換紅外線光譜儀(FT-IR)、顯微拉曼(Micro-Raman)、穿透式電子顯微鏡(TEM)及掃描式電子顯微鏡(SEM)鑑定之。並進一步利用微光致螢光系統(PL)研究其光致螢光特性。研究結果顯示所得之Ta2O5前驅物經固態微波熱處理400 °C或傳統熱處理700 °C兩個小時可得結晶性之Ta2O5，顯示以固態微波可有效的將形成結晶性的溫度下降達300 °C。若直接將Ta2O5前驅物在120 °C下進行微波反應，所得產物為尺寸均一且分散性良好之Ta2O5•nH2O微米球體，並可藉由調整Ta2O5前驅物濃度及微波反應時間來控制球體尺寸，並了解其形成機制。此Ta2O5•nH2O球體藉若經傳統熱處理700 °C或固態微波熱處理600 °C，將可轉變成結晶性之Ta2O5球體。本研究所製備出Ta2O5及Ta2O5•nH2O皆具光致螢光特性，皆為TaO6及TaO7單元中平面氧位置之空缺。 Tantalum(V) oxide (Ta2O5) has received considerable research interest due to its physical and chemical properties. This material is widely applicable in photocatalysts, anti-reflectants, and corrosion-resistant materials. It also has a high dielectric constant, allowing it to be applied in semiconductor components. This study discards the commonly seen sol-gel method, instead using the precipitation method to synthesize Ta2O5 powder. TaCl5 and Na2O2 are used as the starting materials, and methanol is used as the solvent. The “Ta2O5 precursor” is then prepared. Two different heat treatments are then used the traditional and the microwave-assistant heat treatment to obtain the products Ta2O5 or Ta2O5•nH2O. At the same time, the Ta2O5 precursor is directly synthesized into Ta2O5 with a microwave-assistant reaction. In this study, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), micro-Raman, transmission electron microscopy (TEM), and scanning electron microscope (SEM) are used for characterization. Photoluminescence (PL) is further used to research its photoluminescent properties. The research results indicate that the Ta2O5 is obtained when processing with microwave-assistant heat treatment at 400 ºC, or with traditional heat treatment at 700 ºC for two hours; indicating that microwave-assistant heat treatment can effectively lower the temperature of the formation of crystalline by 300 ºC. If a microwave-assistant reaction is directly performed on the Ta2O5 precursor at 120 ºC, the obtained products are Ta2O5•nH2O micron spheres with the uniform size and good dispersion. The concentration and reaction time of the Ta2O5 precursor can be adjusted to control the size of the spheres and to understand its formation mechanism. If these Ta2O5•nH2O spheres are given traditional heat treatment at 700 ºC or microwave-assistant heat treatment at 600 ºC, they can transform into crystalline Ta2O5 spheres. The Ta2O5 and Ta2O5•nH2O prepared in this study all possess photoluminescence, which are the results of oxygen missing in the elements TaO6 and TaO7.

Ta2O5.nH2O及Ta2O5之合成及形成機制和光致螢光之研究 = Synthesis, application and their mechanism of the oxides and oxyhydrates of tantalum
林, 詠翔

Ta2O5.nH2O及Ta2O5之合成及形成機制和光致螢光之研究 = Synthesis, application and their mechanism of the oxides and oxyhydrates of tantalum / 林詠翔撰 - [高雄市] : 撰者, 2011[民100]. - 115面 ; 圖，表 ; 30公分.
參考書目：面98-102103年12月16日公開.
五氧化二鉭Tantalum(V) oxide

Ta2O5.nH2O及Ta2O5之合成及形成機制和光致螢光之研究 = Synthesis, application and their mechanism of the oxides and oxyhydrates of tantalum
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330 $a 五氧化二鉭(Tantalum(V) oxide, Ta2O5) 具有許多物理和化學的特性，可作為光觸媒材料、抗反射材料和抗腐蝕材料。且其具有高介電常數，使應用於半導體元件中。本研究捨棄常見之溶膠凝膠法，改以沉澱法合成Ta2O5粉末。以TaCl5及Na2O2為起始物，甲醇為溶劑，製備出”Ta2O5前驅物”，再經由傳統及固態微波兩種不同熱處理方式得到產物Ta2O5或Ta2O5•nH2O。同時也直接將Ta2O5前驅物經由搭配微波反應合成出Ta2O5。本研究中利用X-ray繞射分析儀、傅立葉轉換紅外線光譜儀(FT-IR)、顯微拉曼(Micro-Raman)、穿透式電子顯微鏡(TEM)及掃描式電子顯微鏡(SEM)鑑定之。並進一步利用微光致螢光系統(PL)研究其光致螢光特性。研究結果顯示所得之Ta2O5前驅物經固態微波熱處理400 °C或傳統熱處理700 °C兩個小時可得結晶性之Ta2O5，顯示以固態微波可有效的將形成結晶性的溫度下降達300 °C。若直接將Ta2O5前驅物在120 °C下進行微波反應，所得產物為尺寸均一且分散性良好之Ta2O5•nH2O微米球體，並可藉由調整Ta2O5前驅物濃度及微波反應時間來控制球體尺寸，並了解其形成機制。此Ta2O5•nH2O球體藉若經傳統熱處理700 °C或固態微波熱處理600 °C，將可轉變成結晶性之Ta2O5球體。本研究所製備出Ta2O5及Ta2O5•nH2O皆具光致螢光特性，皆為TaO6及TaO7單元中平面氧位置之空缺。 Tantalum(V) oxide (Ta2O5) has received considerable research interest due to its physical and chemical properties. This material is widely applicable in photocatalysts, anti-reflectants, and corrosion-resistant materials. It also has a high dielectric constant, allowing it to be applied in semiconductor components. This study discards the commonly seen sol-gel method, instead using the precipitation method to synthesize Ta2O5 powder. TaCl5 and Na2O2 are used as the starting materials, and methanol is used as the solvent. The “Ta2O5 precursor” is then prepared. Two different heat treatments are then used the traditional and the microwave-assistant heat treatment to obtain the products Ta2O5 or Ta2O5•nH2O. At the same time, the Ta2O5 precursor is directly synthesized into Ta2O5 with a microwave-assistant reaction. In this study, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), micro-Raman, transmission electron microscopy (TEM), and scanning electron microscope (SEM) are used for characterization. Photoluminescence (PL) is further used to research its photoluminescent properties. The research results indicate that the Ta2O5 is obtained when processing with microwave-assistant heat treatment at 400 ºC, or with traditional heat treatment at 700 ºC for two hours; indicating that microwave-assistant heat treatment can effectively lower the temperature of the formation of crystalline by 300 ºC. If a microwave-assistant reaction is directly performed on the Ta2O5 precursor at 120 ºC, the obtained products are Ta2O5•nH2O micron spheres with the uniform size and good dispersion. The concentration and reaction time of the Ta2O5 precursor can be adjusted to control the size of the spheres and to understand its formation mechanism. If these Ta2O5•nH2O spheres are given traditional heat treatment at 700 ºC or microwave-assistant heat treatment at 600 ºC, they can transform into crystalline Ta2O5 spheres. The Ta2O5 and Ta2O5•nH2O prepared in this study all possess photoluminescence, which are the results of oxygen missing in the elements TaO6 and TaO7.
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