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[求助]
NaYF4合成
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我根据刘小刚老师2010年nature上的那篇文章里的方法合成NaYF4基体材料时候：第一次产物主要是纳米棒，有一些小方块，后三次主要是纳米小方块，有及少许纳米棒。请问本应该合成产物的形貌应该是什么样子。谢谢！ 下面是文献中的实验材料与实验方法，我的材料是买自同一公司，操作也是按照文献所说。 Materials. GdCl3砠H2O, (99.99%), YCl36H2O (99.99%), YbCl36H2O (99.99%), ErCl36H2O (99.9%), NaOH (98+%), NH4F (98+%), 1‐octadecene (90%), and oleic acid (90%) were all purchased from Sigma‐Aldrich and used as starting materials without further purification. Synthesis of the nanorods. In a typical procedure to the synthesis of lanthanide‐doped NaYF4 nanorods, a DI water solution (1.5 ml) of 0.3 g NaOH was mixed with 5 ml of ethanol and 5 ml of oleic acid under stirring. To the resulting mixture were selectively added 2 ml of RECl3 (0.2 M, RE = Y, Yb, Er, Gd, Sm, Nd and La) and 1 ml of NH4F (2 M). Then the solution was transferred into a 20 ml of Teflon‐lined autoclave and heated at 200 oC for 2 h. The obtained nanorods were collected by centrifugation, washed with water and ethanol several times, and finally re‐dispersed in cyclohexane |
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