Dear all,
I'm trying to improve the quality, monodispersity, and size control of my Ge nanoparticle, which are coated with oleylamine as native ligand (Ge@Oam). Among the different options i'm investigating i'd like to give a shot to etching.
I've been reading quite a lot lately about the argument and i have a pretty clear idea in mind on what i need, but surprisingly i could not really find much a bout etching the NPs in solution. most people deposit them on whatever substrate and etch them or etch them in a top-down kind of approach from bulk.
I have already my nanoparticle dispersed in the solvent, and i simply would like to etch them straight in solution and then recover the etched NPs, and I'm pretty surprised i couldn't really find anybody doing it.
So i wanted to ask if anybody has tried this before, or knows how to do it. also i came out with an pretty neat idea, but it arises more question that it solves (maybe the reason why nobody does that?), so i also wanted to see your feedback about it. it is summarized in a slide at the bottom.
Thanks in advance!
Bruno
Regarding your first question on the slide I think if you have enough OAm around the particles then they may disperse in HNO3 solution due to protonation of -NH2 groups. They may not need to disperse especially well however, see https://www.nature.com/articles/srep00037
For ultrasmall Ge NPs have you considered trying a high temperature oleic acid etching before going to HF?? The smaller NPs may be reactive enough.
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