研究生: |
羅加鈴 Lo Chia-Ling |
---|---|
論文名稱: |
應用實驗設計法製備奈米硫化鋅粉末 Preparation of ZnS nanoparticles by design of experiment |
指導教授: |
江慧真
Chiang Hui-Jean |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
|
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 115 |
中文關鍵詞: | 實驗設計 、硫化鋅 |
外文關鍵詞: | design of experiment, zinc sulfide |
相關次數: | 點閱:3 下載:0 |
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由於硫化鋅系列具有發光效率優良、製程簡單且無毒性等特性,已經廣泛地應用在陰極射線管與平面顯示器…等,顯示出許多特殊的光電性能,因此本研究中以硫化鋅為主題。
在第一部分,研究中以2水準因子之實驗設計法對於影響研究中響應值(產率與粒徑)之各實驗因子進行規劃,其目的在於以較少的實驗組合而得合理及準確之分析結果。此外,亦採用統計學上之變異數分析法(ANOVA)說明實驗因子對響應值(Response Value)之影響及因子間之交互作用關係。而各實驗因子之高低水準則設定如下:醋酸鋅濃度(0.05、0.35 M)、硫代乙醯胺(0.05、0.35 M)、時間(40、80 min)、溫度(70、90 ℃)。並且討論了成長時間、反應溫度、反應物濃度對硫化鋅粒子奈米尺寸和產率的影響,最後取得最佳化配方。
在第二部分,嘗試在酸性和鹼性下做反應,實驗結果顯示,在pH=3環境下,其粒形、結晶性和分散性都較好,缺點在於產率無法提高;在pH=9環境下,所得的產率較佳,但有氧化鋅出現。不管在酸性或鹼性下,發光強度皆下降。
在第三部分,嘗試在400℃下進行燒結,粒徑較小者,有較高的表面能,較易與氧結合而氧化成氧化鋅;施以熱處理後之螢光粉體,其粉末粒徑有些微變大之趨勢。螢光光譜中,硫化鋅經過400℃燒結後,發光強度皆下降。
Because the zinc sulfide series has the fine luminous efficiency, the system regulation to be simple, and characteristics and so on nontoxicity, already widely applied in the cathoderay tube and the plane monitor…And so on, demonstrates many special electro-optical performance, therefore in this research take the zinc sulfide as the subject.
In the first part, effects of operating conditions on mass transfer coefficient were studied. Since the response values (production rate and particle size ) were influenced by experimental factors, the two-level factorial experimental design methodology was used to set operating conditions of experimental factors. The purpose of this method is to obtain reasonable and accurate results by the fewer experimental runs. In addition, effects of experimental factors on the response value and interactions between factors were explained by the analysis of variance (ANOVA) statistically. The high and low level of experimental factors were set as following: 0.05 and 0.35 M zinc acetate dehydrate , 0.05 and 0.35 M thioacetamide (TAA), 40 and 80 reaction time , 70 and 90 reaction temperature. The effect of preparation parameter on ZnS particles and throughput such as reaction temperature, reaction time, concentration are discussed. Finally obtains the optimization formula.
In the second part, the attempt makes the response under the acidity and the alkalinity, the experimental result demonstrated that under the pH=3 environment, its grain shape, the crystallinity and the dispersivity is good, the shortcoming lies in the production rate to be unable to enhance; Under the pH=9 environment, the obtained production rate is good, but has the zinc oxide to appear. No matter under the acidity or the alkalinity, the luminous intensity all drops.
In the third part, attempts in 400℃ under carries on the agglutination, particle size small, has the high surface energy, oxidizes the zinc oxide easily with the oxygen union; After serving with the heat treatment, the phosphor body, its powder particle size has slightly tendency of the fill-out. In the fluorescence spectrum, after the zinc sulfide passes through 400℃ the agglutination, the luminous intensity all drops.
Key word:design of experiment、zinc sulfide
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