研究不同界面活性劑對液相雷射融蝕法結合氧化還原法製備金/銅奈米粒子之影響

Investigation of the effect of different surfactants to prepare the gold / copper nanoparticles by laser ablation in liquid and oxidation-reduction methods

李承曄(Cheng-Yeh Li)

指導教授 ： 陳慧芬

高雄醫學大學/生命科學院/醫藥暨應用化學系碩士班/碩士(2019年)

摘要

本論文係以液相雷射融蝕法(波長532nm釹-雅各雷射)先擊打金屬銅板生成銅奈米粒子，再利用銅奈米粒子還原溶液中的金鹽生成金奈米粒子。首先，分析改變界面活性劑溴化十六烷基三甲銨與金鹽濃度合成金奈米粒子溶液在紫外可見光譜吸收峰位置和電子顯微鏡圖下粒子外觀型態與粒徑分佈，並與文獻中利用化學還原法合成金奈米粒子的方法做比較；第二，在三種不同界面活性劑(溴化十六烷基三甲銨、十二烷基硫酸鈉、曲拉通X-100)環境下合成金奈米粒子，觀察合成粒子的差異，觀察發現以溴化十六烷基三甲銨合成奈米粒子，可得粒子平均粒徑20.94 ± 4.63 nm，粒子分散性佳，外觀形狀為較完整球形；以十二烷基硫酸鈉合成奈米粒子，可得平均粒徑13.12 nm，分散性較差，外觀形狀破碎；以曲拉通X-100合成奈米粒子，粒子外觀產生兩種粒徑分布，分別為20.17 ± 4.40 nm與4.77 ± 1.69 nm，並與液相雷射直接融蝕金板生成金奈米粒子的研究做粒徑以及粒子外型比較。另外，在十二烷基硫酸鈉、曲拉通X-100環境下，分別添加溴化鉀水溶液觀察合成奈米粒子的變化，在十二烷基硫酸鈉環境加入溴化鉀水溶液，使粒子較難生成，幾乎無法分辨，但在曲拉通X-100環境下，卻無影響奈米粒子合成。
在使用界面活性劑溴化十六烷基三甲銨環境下，施用雷射擊打金屬銅板10分鐘，可能合成特定尺寸奈米金粒子或金簇，並在光譜上410 nm左右可發現螢光訊號。

關鍵字

金/銅奈米粒子 ； 液相雷射融蝕法 ； 氧化還原

並列摘要

In this study, we apply the laser ablation in liquid method (Nd-YAG laser @532 nm ) to produce the Cu nanoparticles which will further reduce HAuCl4 in the aqueous solution and form the gold nanoparticles.
First, we synthesized gold nanoparticles solutions by changing the concentrations of the surfactant cetyltrimethylammonium bromide (CTAB) and HAuCl4 and analyzed the nanoparticles’ morphology and size by UV-visible spectroscopy and the TEM images. Then, we compared and discussed the differences of the gold nanoparticles between our method and the chemical reduction method in the literature.
Second, we synthesized gold nanoparticles by using three different surfactants (cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), Triton X-100 ) to study the surfactants’ effects. We observed that the average particle size is 20.94 ± 4.63 nm, good dispersibility, and spherical shape in CTAB solution；the average particle size is 13.12 nm, poor dispersibility, and broken shape in SDS solution. In Triton X-100 solution, there was two distributions of particle size with 20.17 ± 4.40 nm and 4.77 ± 1.69 nm. And we compared the gold nanoparticles synthesized by our method and laser ablation in liquid which laser striked on the Au plate directly. Further, we added potassium bromide (KBr) in the surfactants SDS and Triton X-100 solution, respectively, to prepare the gold nanoparticle and observed that it was diffficult to form nanoparticles in SDS solution with KBr, but no obvious change happened for nanoparticles in Triton X-100 with KBr.
In CTAB solution, we applied laser ablation in liquid which laser striked on the Cu plate for 10 minutes. Nanoparticles and nanoclusters with specific sizes were formed, and we found fluorescent signal in 410 nm in photoluminescence spectroscopy.

並列關鍵字

gold/copper nanoparticles ； laser ablation in liquid ； oxidation-reduction method

參考文獻

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