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求助大神關(guān)于金納米棒的問題
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打算合成長徑比3.5,長 54.0 ± 2.1 nm 寬 15.9 ± 1nm的金棒,參考的是Catherine J. Murphy之后再13年的一篇文獻(xiàn),具體如下:A solution of 2.5 × 10−4 M HAuCl4 was prepared in 0.1 M aqueous CTAB in a 50 mL centrifuge tube. NaBH4 (600 μL, of a 10 mM stock solution) was added to the gold/CTAB solution (10 mL) with vigorous stirring for 10 min with the help of a stir bar. The resulting seed particles (~3 nm diameter) were used for the synthesis of both short and long gold nanorods. For the short gold nanorods (aspect ratio 3.5), the following were added, in order, to a conical flask: CTAB solution (95 mL of a 0.1 M stock solution), silver nitrate solution (1 mL of a 10 mM stock solution), and HAuCl4 (5 mL of a 10 mM stock solution). An aqueous solution of ascorbic acid (0.55 mL of a 0.1 M stock solution) was then added with gentle mixing. Finally, the gold seed solution (0.12 mL) was added and mixed. The solution was left undisturbed overnight. The colored gold nanorod solution was purified by centrifugation (2×) to remove excess CTAB. The method yielded gold nanorods of length 54.0 ± 2.1 nm and width 15.9 ± 1.1 nm。 合成了四五次,金種為茶葉水的顏色,每部過程當(dāng)中的顏色也正常,但是最后生長的時候一次巧克力色,一次黃綠色,一次紫紅色,并且巧克力色和紫紅色都在500多只有一個紫外吸收峰,黃綠色的在400多一個吸收峰,求大神指導(dǎo)!。。⌒暮美踾 |
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