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[求助] 水溶液中微波制备CdSe量子点问题

最近我们利用参考文献制备量子点，文献是8nm一下，可是我们做出来是200多纳米。资料是微波法合成，我用家用微波炉做了几次都达不到，请问你这个几纳米的怎么用微波做出来的？不用搅拌？通氮气么？谢谢！

制备的文献操作见下面：

Citrate-stabilized CdSe nanocrystals:
Citrate-stabilized CdSe nanocrystals were prepared according to the following procedure: To 45 mL of water were added 0.05 g sodium citrate and 2 mL of 4*10-2 M cadmium perchlorate and the pH was adjusted to 9.0 by 0.1 M NaOH. The solution was bubbled with nitrogen for 10 min, 2 mL of 1*10-2 M N, N-dimethylselenourea was added, and the mixture was heated in a conventional 900 W (Sharp) microwave oven for 50 s. The final volume of the solution after heating was ca. 40 mL. In the recipe described above, the Cd:Se molar ratio was 4:1, which leads to CdSe nanoparticles with ca. 4.0 nm diameter; by increasing the Cd concentration it is possible to synthesize smaller CdSe nanocrystals.

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