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[求助]
求助合成4-5nm的金纳米颗粒的方法已有3人参与
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| 请大家帮忙，我现在急需要4-5nm的金纳米颗粒，由于需要后续修饰巯基，因此不能用巯基稳定剂稳定，最好是用柠檬酸三钠稳定，我之前用过柠檬酸三钠和单宁酸来制备，但是粒径比较大，而且我担心单宁酸分子量比较大会不会影响后续修饰？因此想求助用柠檬酸三钠和硼氢化钠制备金纳米颗粒的方法，请各路大神不吝赐教，感激之至！ |
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ping_fiu
新虫 (小有名气)
- 应助: 1 (幼儿园)
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12楼2014-11-13 04:48:03
【答案】应助回帖
感谢参与，应助指数 +1
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6纳米左右 Monodisperse I-IL-Au NPs were prepared by the reduction of HAuCl4 with sodium borohydride (NaBH4) according to the previous work [20–22] . In brief, firstly the fresh sodium borohy-dride solution (NaBH4, 1 mL, 4.5 mg mL−1) was added dropwise to 100 mL aqueous solution of HAuCl4(1 mL, 8.9 mg mL−1) under vigorous stirring at room temperature. About 15 min, a vivid red colored solution was produced. Finally, after added the amino-functionalized ionic liquid, the gold colloidal solution was stirred for another 2 h to ensure self-assembly of the ionic liquid onto the surface of gold nanoparticles. The synthesized I-IL-AuNPs were purified by centrifugation and redispersed in double-distilled,deionized water twice. The final concentration of I-IL-Au NPs were 57.29 nM calculated using Beer’s law with the extinction coefficients (ε) of 1.1 × 107M−1cm−1 for Au NPs of 5.6 ± 0.4 nm diameter。 |
2楼2013-12-04 19:19:13
3楼2013-12-05 21:15:55
4楼2013-12-05 21:32:05