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研究生:鄭紘彰
研究生(外文):Hung-Chang Cheng
論文名稱:一維硒奈米材料成長機制及選擇性反應之研究
論文名稱(外文):Growth Mechanism and Reaction Selectivity of 1D Selenium Nanoparticles
指導教授:王崇人
指導教授(外文):Churng-Ren Chris Wang
學位類別:碩士
校院名稱:國立中正大學
系所名稱:化學所
學門:自然科學學門
學類:化學學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:80
中文關鍵詞:一維奈米粒子核殼結構
外文關鍵詞:selenium.one directioncore-shell structure
相關次數:
  • 被引用被引用:1
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  • 收藏至我的研究室書目清單書目收藏:0
對於各種維度( Dimension )之新穎奈米材料的開發,常為相關研究人員努力的方向。其中針對一維奈米材料的合成及應用,實為此項研究之大宗。
合成一維之奈米硒顆粒,有釵h不同的方法;我們採用二階段( two-stage )溫度控制,並藉由CMC為系統之穩定劑,合成出具有區段性結晶,且可控制其長短軸比值之一維奈米硒材料。
針對一維奈米硒之成長機制,藉由TEM、XRD、Raman等檢測儀器,並配合適當之統計結果以及XRD理論模擬光譜圖,我們可以發現,在成長過程中,不僅僅只有一般之長晶的過程,其中可能包含有顆粒兩端相互組裝( End-to-end assembly )而成長的機構;並且其結構之晶相亦於成長時由單斜(m-Se)、三方(t-Se)兩混合晶相材料轉變至某些區段為單斜晶相,其餘為三方晶相之區段性奈米硒材料( Segmented nanoselenium,SNS )。
再者,我們以不同長短軸比值之奈米硒顆粒作為模版,配合不同程度的二氧化矽層表面修飾與SNS材料區段性結晶之特性,利用氯金酸離子的吸附作用,可以呈現出SNS之區域選擇性反應的現象。不僅如此,我們亦探討了奈米金於此系統生成之三個不同途徑。
另外,有趣的是,若我們以奈米硒之成長中間體為起始物,配合以MPTMS作為轉接層,經由類似顆粒之自組裝反應過程,則可獲得結構類似刷子之奈米顆粒( Nanobrush );更進一步地,憑藉著實驗室所具有之技術,以聯氨作為還原劑,進行內層奈米硒之移除,可獲得特殊之二氧化矽中空刷子結構。
The synthesis and application of suspended one dimension (1D) selenium nanoparticles are major focus in this thesis. I demonstrated a “two-stage” temperature control strategy for their successful synthesis, along with CMC acts as stabilizer. We have gained exquisite control in particle aspect ratios and proven that the final Se nanoparticles possessing segmented crystallinities.
By the use of TEM, XRD, and Raman, the growth mechanism of 1D nanoselenium particles can be pinpointed. Evidences show that end-to-end assembly between rod-like particles dominates the growth process. The nanorod seeds, containing mostly monoclinic crystal phase, has appeared in the early-stage of particle growth. They grow to 1D segment nanoselenium (SNS) with linking segments of trigonal phase.
In Addition, we used SNS particles, either nanorods or nanowires, as templates to demonstrate the segment-selective reactivities for the adsorption of AuCl- molecules. There are three different routes of nano-Au formation in this system will be described.
Interestingly, through self-assembly of Se nanoparticles, the “brush-like” structure has been obtained. The formation of such nanobrush particles is achieved by the use of the sol-gel process of MPTMS to link long and short Se nanorods. Additionally, the core material of Se can be removed by hydrazine and end up with an unique silica hollow brush structure.
總目錄
圖目錄
中文摘要
英文摘要
第一章 引言
1.1 小奈米,大發現
1.2 奈米材料的定義與製備
1.3 研究動機與目標
第二章 一維奈米硒之合成
2.1 合成策略
2.2 實驗藥品與檢測儀器
2.2.1 實驗藥品
2.2.2 檢測儀器
2.3 製備步驟與檢測
2.4 一維硒奈米線之成長機制探討
第三章 一維硒奈米顆粒選擇性的反應
3.1 合成策略
3.2 實驗藥品與檢測儀器
3.2.1 實驗藥品
3.2.2 檢測儀器
3.3 特殊之一維奈米複合材料–魚標/串珠狀核殼結構
3.3.1 製備「魚標狀」一維硒奈米核殼結構
3.3.2 奈米金包覆硒奈米圓柱及奈米線
3.3.3 選擇性反應︰奈米金析出於一維硒奈米材料之不同區域
3.3.4 奈米金析出途徑之探討
3.3.5 硒奈米圓柱的移除並形成中空一維複合材料
第四章 特殊之一維奈米複合材料–奈米刷子結構
4.1 前言
4.2 實驗藥品與檢測儀器
4.2.1 實驗藥品
4.2.2 檢測儀器
4.3 奈米刷結構之合成與生長機制
4.4 中空之二氧化矽奈米刷結構
第五章 結論與未來展望
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