摘 要
本研究採用多元醇法製備一維銀奈米線，並討論在不同的合成條件下如反應溫度、反應時間、合成單體濃度、及成核劑對銀奈米線成長的影響。在實驗過程中，我們詳細討論了不同體積比的AgCl、AgNO3與PVP，以及反應溫度與時間對一維銀奈米線製備的影響。合成後的一維銀奈米線通過紫外光-可見光光譜儀來判斷產物之吸收峰波長並預測可能結構，再以掃描式電子顯微鏡（SEM）觀察產物表面形貌以驗證與UV-Visible光譜的關連。結果顯示，通過改變 AgCl 和 AgNO3、PVP 的重量，反應溫度與時間，可以製備出具有良好縱橫比的一維銀奈米線，最佳技術參數為 AgCl:0.05 g、AgNO3:0.11 g、PVP:0.68 g、反應溫度: 160 ℃、反應時間: 24 min合成條件下，可獲得平均長度約 18.54 µm 之銀奈米線。此外，我們更進一步發現，使用 UV-Vis 光譜與SEM形貌比對分析，可以有效分辨出銀奈米線的吸收峰訊號會落在350 nm 和 380 nm 附近，銀奈米粒子會落在 400-420 nm 左右位置，若這些位置同時都出現吸收峰訊號，則是銀的顆粒與長徑比較小的銀奈米線共存。
關鍵詞：多元醇法、銀奈米線、一維奈米材料
Abstract
This study explores the growth behavior of one-dimensional silver nanowires (Ag NWs) prepared using the polyol method. The effects of various reaction conditions, such as reaction temperature, reaction time, monomer concentration, and nucleating agent, on the growth of Ag NWs are discussed in detail. Specifically, the effects of AgCl, AgNO3, and PVP at different volume ratios, reaction temperatures, and reaction times on the preparation of one-dimensional Ag NWs are examined. The synthesized Ag NWs are characterized using ultraviolet-visible spectrometer (UV-Vis) to predict their possible structure, and their surface morphology is observed with a scanning electron microscope (SEM) to confirm the correlation with the UV-Vis spectrum. The results show that changing the volume, reaction temperature, and time of AgCl, AgNO3, and PVP can produce one-dimensional Ag NWs with a good aspect ratio. Under optimal process parameters (AgCl: 0.05 g, AgNO3: 0.11 g, PVP: 0.68 g, reaction temperature: 160 ℃, and reaction time: 24 min), Ag NWs with an average length of approximately 18.54 μm can be obtained. Furthermore, this study demonstrates that UV-Vis spectroscopy can effectively distinguish the main absorption peaks for Ag NWs of 350 nm and 380 nm and silver nanoparticles (Ag NPs) of 400 nm and 420 nm. Overall, the polyol method shows promise as an effective way to produce one-dimensional nanomaterials, particularly silver nanowires.
Keywords: Polyol Method, Silver Nanowires, One-dimensional Nanomaterials