https://scholars.lib.ntu.edu.tw/handle/123456789/178747
標題: | 第一部分:二元及三元一維奈米材料之合成及其特性分析二部份:奈米金雙聚體之系統化建構 Part A: Synthesis and Characterization of 1-D Binary andernary Nanocrystals.art B: Systematical Construction of Gold Nanoparticle Dimers |
作者: | 彭歆傑 Peng, Hsin-Chieh |
關鍵字: | 奈米棒;二六族奈米材料;複合材料;奈米金雙聚體;CdS nanorods;CdSe nanorods;gold nanorods;hybrid materials;15-crwon-5 ether;DNA;gold nanoparticle dimers | 公開日期: | 2008 | 摘要: | 本研究分為兩個部分,第一部分是一維二元及三元奈米複合材料之合成及其特性分析,第二部分則是奈米金雙聚體之系統化建構,並且探討形成奈米金雙聚體時的光物理性質。第一部分研究中,本實驗藉由晶種催化(seed-mediated)之方式合成出一系列一維奈米複合材料,如金屬/半導體(Au/CdS、Ag/CdS、Au/CdSe)之二元奈米複合材料,利用半導體奈米棒作為晶種並控制反應時間及當量,即可於半導體奈米棒兩側端點或僅單側成長金或銀奈米粒子。若以二元複合材料作為晶種,由於具有雙成分之組成,因此可視為具有兩種晶種。於金屬奈米棒之成長條件下,金屬部份將作為成長奈米棒之晶種,進而得到棒對棒(Au rod-to-CdS rod)之特殊結構;另外,於半導體奈米棒之成長條件下,二元材料中半導體部份將作為晶種提供第二種的化合物半導體材料共軸成長而得到三元(Au/CdSe/CdS)奈米複合材料。本研究亦藉由高解析電子顯微鏡建立其成長機制。二部分為奈米金雙聚體之系統化建構,本研究建立一系列特殊之建構方式得到具有單一特定分子(15-冠-5醚或ssDNA) 鍵結於其表面之奈米粒子,並且使兩顆金奈米粒子表面之單一分子之間產生化學鍵結,由TEM中所得到特殊形貌之奈米金雙聚體(Au dimer)及證明金奈米粒子表面僅有單一分子之修飾,另外亦藉由紫外/可見光吸收光譜監測奈米金粒子於形成雙聚體過程中金奈米粒子表面電漿共振吸收峰位置改變之獨特光物理性質並加以探討其原因。 Part A:n important research direction in nanomaterials synthesis is the expansion from single-component nanoparticles to hybrid nanostructures with discrete domains of different materials arranged in a controlled fashion. Here, we report the synthesis and characterization of binary and ternary hybrid nanocrystals based on spontaneous nucleation and growth of a second and third component onto seed nanoparticle. Multifunctional hybrid nanoparticles combining plasmonic and semiconducting properties which are tunable in size and morphology can be realized, as demonstrated for combinations of Au, CdS, and CdSe. Two classes of hybrid nanoparticles are presented: metal-semiconductor (Au/CdS) and metal-semiconductor-semiconductor (Au/CdSe/CdS) hybrid nanoparticles. In the Au/CdS system, the size of the gold tips can be controlled by the concentration of the starting materials. Using CdS/Au-tip as the seed, CdS nanorod/Au nanorod hybrid nanocrystals can be prepared by a seeding growth approach in the presence of an aqueous miceller template. In the Au/CdSe/CdS system, the Au tip, as a stopper, restrains CdS from necleation on the Au side, then CdS nanorod only grows on the end of CdSe.art B:he single molecule functionalized Au nanoparticles (NPs) were synthesized with the assistance of silica particles. The use of silica particles renders intrinsic advantages that each step along the product formation can be monitored by e.g. transmission electron microscope. The large surface to volume ratio of silica particles leads to a good yield of Au NPs attachment. Here, we demonstrated three methods to prepare gold nanoparticles dimers from the coupling of two singly functionalized-Au NPs (modified with 15-crown-5 ether or single-stranded DNAs (ssDNAs). |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/187444 |
顯示於: | 化學系 |
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ntu-97-R95223029-1.pdf | 23.32 kB | Adobe PDF | 檢視/開啟 |
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