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[求助] 金壳生长求助

小弟目前在重复一篇文献,可是到了金壳生长阶段总是出现问题,希望大家看到后能帮帮忙。
过程是In the gold shell growth step, 10 mg of potassium carbonate(K2CO3) were dissolved in 40 mL of water. After 10min of stirring, 1.5 mL of 0.01 MHAuCl4 solution was added. The solution initially appeared transparent yellow and slowlybecame colorless over 30 min. To this vigorously stirred solution, 500 μL of the Au-SSCNs
solution (1.5 mg solid content) was added. Then, 500 μL (78.8 mM) aliquot of L-ascorbicacid was injected. After reacted for 5min, the solution changed to blue green, which indicatedthe formation of Au nanoshells. To investigate the growth process, different amounts of Au-SSCNs were added in the above growth solution for gold nanoshells formation。
加入抗坏血酸之后,溶液很快变成紫黑色,不一会儿有黑色颗粒产生。   产生这种现象的原因是什么呢,有知道的吗?
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