I am using HF etching to make sharp tips on silica optical fibers and would like to hydrolyze the surface following the HF etching and then attach cross-linker molecules, which attach to the glass a silane tail-group. I'm looking for the easiest/quickest reliable way to hydrolyze the surface. I know that piranha is a good candidate; however, don't know what effect the HF has on the surface chemistry of the glass.
Any suggestions?
Can I know about using of Piranha solution in synthesis of GNPs? While Piranha solution is very dangerous.
Pirhana is clearly a good candidate, but beware of the solution as it is very exothermic (reaction time typically around 15 minutes).
UV ozonolyze is also a good way to hydroxilyze and clean silica (reaction time typically around 30 minutes).
I used a lot of HF etching during my thesis, and after this etching the silicon dioxyde surface is full Si-H and some Si-F.
Thanks for the help all. We were going to try etching--> ozone --> pirhana, but Jan, if you think the pirhana will yield enough OH groups after etching without the need to use ozone (SiF --> SiO), I will try it.
Piranha solution is particularly useful when cleaning sintered (or 'fritted') glassware. The size of the pores of sintered glassware is critical for its function, so it should not be cleaned with strong bases, which gradually dissolve the sinter. Sintered glass also tends to capture material deep within the structure, making it difficult to remove. Where less aggressive cleaning methods fail, piranha solution can be used to return the sinter to a pristine white, free flowing form without excessive damage to the pore dimensions. This is usually accomplished by allowing piranha solution to percolate backward through the sintered glass. Piranha solution is used to make glass hydrophilic by hydroxylating the surface, thus increasing the number of silanol groups on the surface.
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