Any material good for enhancing platinum adhering on hydrophobic surfaces?
I think the adsorption will depend on you silica type and the method you are employing to deposit the platinum on the support.
a 6%wt platinum metal on silica is described here:
Platinum on SiO2 is adhering very well - provided you sputter it. (If you need thicker layers, you could sputter an initial layer of 10 nm (and beyond) - continuing with vapor phase deposition if desired. No need for some pre-coating!
We once used platinum to get a gold layer to adhere to SiO2, Si3N4 and TiN. On all of these substrates adherance was perfect for our needs (including high-pressure water cleaning following the production steps). Where Pt was underneath, the Au was perfectly bonded to the substrate - up to the point that some "rest rings" of Au with no Pt underneath tore off exactly at the boundary between the areas without / with Pt underneath during high-pressure cleaning.
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