Wet etching of TiO2

Hi, all,
Anyone here know how to wet etch TiO2? I just want to etch thin film
of TiO2 to expose the bottom electrode. I have checked some papers and
there are several reported method such as using H2SO4, HF & HNO3, HF &
NH4F. However, the details about the required purity or mixing ratio
was not there. Anyone can provide me of more details? Thanks very
Btw, the TiO2 thin film was got from sol-gel method and was deposited
on Si wafer. Since TiO2 is very difficult to etch, is it possible to
let the bottom electrode exposed during other processes? Anyone has
suggestions or similar experiences?
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