I use electrochemical anodization method. Initially there where no depostion but when I repeated the same experiment I could see deposition.
Can you tell the composition of your electrolyte?
It may be helpful: paper with DOI: 10.1166/sam.2014.1760
I think you have used aqueous solution of HF which is active/corrosive in high level. So, after switching off your power supply, the HF etched the oxide fully. Quick wash with DI water may resulted in better result. A prompt action is needed for anodized metal to remove any attached fluoride ion from the oxide surface.
Hope, this will be helpful.
Thank you @Kousik Dutta sir for your reply.
I use 2 kinds of electrolyte, DMSO and EG.
I always wash my samples using DI water and Pt-foil sonicated using acetone and ethanol after anodization. But I have never washed the Pt-foil using acid.
Do you think oxidation of Pt would be the reason for depostion on the nanotubes?
@Jyorthana Muralidhar, it is not clear that, whether Pt foil is used as cathode in anodization or it has been used for sonication process. However, in any case, Pt will not be oxidized as it is inert material. However, if you use organic solvent, then due to paucity of water hinders the dissolution of TiF62- and some part of them resides on the grown nanotubes trapping some molecules of solvent used. I think that unwanted deposition you found in your sample.
The picture of one of my sample is attached here. Is the unwanted deposition resembles this?
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