利用液相法於分子薄膜上直接成長銀奈米粒子研究

Silver Nanoparticles Grown Directly on Molecular Membrane by Solution-Phase Process

梁欣伶(Hsin-Ling Liang)

指導教授 ： 林滄浪

國立清華大學/原子科學院/工程與系統科學系/碩士(2006年)

https://doi.org/10.6843/NTHU.2006.00544

摘要

本論文探討使用晶種還原法直接於二維平面上成長銀奈米粒子，二維平面為使用L-B技術製程的磷脂質分子DSPC單層膜。在成長奈米粒子的製備中，第一步將此薄膜浸泡於銀晶種(~5 nm)溶液中，接著再將吸附晶種後的薄膜泡入包覆劑CTAB溶液中，最後將AgNO3、ascorbic acid與NaOH陸續加入CTAB形成成長液，使晶種於薄膜上開始成長，主要產物為三角形平板、六角形平板與奈米棒，粒徑尺吋30~50 nm。若實驗過程中沒有晶種與薄膜的存在，則會形成產量極少且為不規則的條狀結構。針對顆粒產量，本實驗發現浸泡晶種溶液時25分鐘時，產量達一臨界值；浸泡成長液25分鐘時，產量也達臨界值；而在浸泡CTAB的實驗中，發現於本系統中若不先單獨浸泡CTAB，顆粒產量提高2~3倍；由重複浸泡成長液3次，顆粒與奈米棒產量可達2~3倍，顆粒尺寸與奈米棒長度也提高2倍，最長能達2 μm；由增加薄膜的缺陷，即製作三層薄膜，產量能提高3倍。另外利用L-B技術製備薄膜圖形，本實驗發現在基板固/氣/液界面的meniscus區域能發現DSPC的樹枝狀與DSPC:Chol=2:8的圓形圖形，使銀顆粒能有區域型的成長。最後在DSPC崩潰壓時製成的薄膜，發現多有從團聚顆粒中輻射出的奈米線，長度達10 μm以上， 可能由於薄膜上的皺摺所造成。

關鍵字

晶種還原法 ； 分子薄膜 ； L-B ； Langmuir-Blodgett ； 銀奈米顆粒

並列摘要

Controlled patterning of metal nanoparticles on surface seems to be very promising for nanotechnology applications in electronics, photonics, and (bio)chemical sensing. In this research, we studied the growth of nanoparticle/wires directly on phospholipid Langmuir-Blodgett films by seed-mediate method. Using DSPC, Cholesterol and DSPC/Cholesterol mixed monolayers as templates, we successfully synthesized triangular plates, hexagonal plates, nanorods, and even nanowires longer than 2 μm. Experiments with difference conditions, such as soaking time of the seeds, number of LB layers, etc. were conducted to optimize the synthesizing process. Very long silver nanowires were synthesized on the monlayer LB films prepared at exceeding the breakdown surface pressure. It is suspected that line defects were formed on the monolayer at exceeding the breakdown voltage and they serve as the template to induce the growth of nanowires along these line defects.

Keywords: seed-mediate method, Langmuir-Blodgett film,
silver nanoparticle, surface nanopattern

並列關鍵字

seed-mediate method ； Langmuir-Blodgett film ； silver nanoparticle ； surface nanopattern

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