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苓linglucky铜虫 (小有名气)
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[求助]
小尺寸金棒合成请教 已有1人参与
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| 实验需要想合成30*6的金棒，用的都是国药的试剂，一直没有金棒的生成，测紫外只有520的峰， 请教一下各位大神，合成小尺寸的金棒必须是sigma的药品才可以吗？ |
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苓linglucky
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4楼2017-09-11 16:32:38
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苓linglucky: 金币+50, ★★★很有帮助 2017-09-11 16:32:46
感谢参与，应助指数 +1
苓linglucky: 金币+50, ★★★很有帮助 2017-09-11 16:32:46
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不需要一定是Sigma 药品。可以参照这篇文章进行合成，还是靠谱的： Ali MRK, Snyder B, El-Sayed MA: Synthesis and Optical Properties of Small Au Nanorods Using a Seedless Growth Technique. Langmuir 2012, 28:9807-9815. Abstract： Gold nanoparticles have shown potential in photothermal cancer therapy and optoelectronic technology. In both applications, a call for small size nanorods is warranted. In the present work, a one-pot seedless synthetic technique has been developed to prepare relatively small monodisperse gold nanorods with average dimensions (length×width) of 18× 4.5 nm, 25×5 nm, 15×4.5 nm, and 10×2.5 nm. In this method, the pH was found to play a crucial role in the monodispersity of the nanorods when the NaBH4 concentration of the growth solution was adjusted to control the reduction rate of the gold ions. At the optimized pH and NaBH4 concentrations, smaller gold nanorods were produced by adjusting the CTAB concentration in the growth solution. In addition, the concentration of silver ions in the growth solution was found to be pivotal in controlling the aspect ratio of the nanorods. The extinction coefficient values for the small gold nanorods synthesized with three different aspect ratios were estimated using the absorption spectra, size distributions, and the atomic spectroscopic analysis data. The previously accepted relationships between the extinction coefficient or the longitudinal band wavelength values and the nanorods’ aspect ratios found for the large nanorods do not extend to the small size domain reported in the present work. The failure of extending these relationships over larger sizes is a result of the interaction of light with the large rods giving an extinction band which results mostly from scattering processes while the extinction of the small nanorods results from absorption process |
3楼2017-09-11 12:51:01
5楼2017-09-11 20:25:24