金奈米螺旋結構與成長分析

本研究利用賈凡尼置換反應進行鋁-金之間的氧化還原，並藉由添加界面活性劑輔助作為晶面成長抑制劑的角色來控制形貌。在氯金酸溶液中，藉由同時添加十六烷基三甲基氯化 (cetyltrimethylammonium chloride) 、聚乙烯吡咯烷酮 (polyvinylpyrrolidone) 、poly (ethylene glycol) (12) tridecyl ether三種界面活性劑，在低溫環境下由鋁基材上製備出直徑約為 200-500 nm，長為數十微米的金奈米螺旋結構。由上述的三種界面活性劑做不同組合的添加，如只添加單一種 (PVP、PEG、CTAB) 或添加兩種 (PVP+CTAB、PVP+PEG、CTAB+PEG) ，即可得到不同形貌的金奈米結構。在由上述不同形貌的金奈米結構與前人文獻結合，說明了CTAB會在金的表層形成一雙層結構，促使奈米金往一維方向成長，PVP則作為一個包覆劑，包覆於奈米金的表面。而PEG在水中會成一螺旋狀，進而抑制金的成長，形成金奈米螺旋結構。從金奈米螺旋結構的TEM圖得知，金原子的排列會在 (111) 面有一雙晶面，其雙晶面兩旁的晶粒會夾一角度，證明金奈米螺旋結構旋轉的特性。

關鍵字

賈凡尼置換反應；界面活性劑；金奈米螺旋結構

並列摘要

Large-scale gold nanospirals were synthesized using surfactant-assisted galvanic replacement reaction on Al substrates. By controlling the reaction temperature and the amount of surfactants, gold nanostructures with different morphologies were obtained, such as nanowires, nanobelts, nanoplates, and dendrites. The gold nanospirals with 200-500 nm in diameter and >10 μm in length were formed in an aqueous solution containing polyvinylpyrrolidone, poly (ethylene glycol) (12) tridecyl ether, and cetyltrimethylammonium bromide as the surfactants. By adding the above surfactant to do the different experiment, there will be various gold structures, for example, the result is defferent by adding one kind of surfactant (PVP、PEG、CTAB) or two kind of surfactants (PVP+CTAB、PVP+PEG、CTAB+PEG). To combine the gold structure with the history literature, the morphologies display CTAB will form two structures of layer on the surface of gold, and make the gold structure grow to a direction. PVP covers the gold structure as a capping agent, and PEG will take shape as spiral to restrain the growth of gold and form the gold nanospiral. In the end, it could be known by the TEM picture of gold nanospiral, the order of gold will form a twin plane and make an angle by the sides of it, therefore, it is proved that the gold nanospiral could turn.

並列關鍵字

galvanic replacement reaction ； surfactant ； gold nanospirals structure

參考文獻

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國際替代計量

金奈米螺旋結構與成長分析

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