A little experience of Stober method synthesized uniform silicon balls.

has been on the small woodworm for a long time, often found to ask questions about silicon synthesis and cladding. I've also done silicon balls for two years, mainly using synthetic silicon balls for a bit of signation and application. Here I would like to tell you about my experience and lessons, hope to give the newly introduced younger siblings a little help, less detours. Myths, please also point it out.

1. Quick mix solution A and B, reason: this system, ammonia concentration is actually quite high, mixing too slowly, nucleation is uneven, the resulting product is uneven;

2. After mixing evenly, the stirring speed is reduced; the reason: ahow can you determine the approximate size and uniformity of a product without TEM? :with a glass rod on a drop of product solution, to the reaction table to wipe,dry after the discovery of color, it represents a relatively uniform reaction product, and can be based on color to judge the size, such as blue-green indicates that the product in about 400 nm, red represents a relatively large product, estimated to be more than 500nm. Similarly, looking at the color of your product after centrifugal can also be judged, because if they are even, they can form photonic crystals.But don't ask me how much nm of silicon ball i'm going to prepare, I just need this one size, but you can adjust the size by adjusting the ratio of ammonia to water, please refer to this paper, if possible, later when writing paper to help lead this piper, haha.