I think using plasma treatment is useful because it does not damage the material bulk and does not require high power. Also, it is durable without any complex reaction and many material.
and Bandna Bharti thanks a lot for your suggestions but actually I'm looking for a material except Silanes to modify titania nanoparticles because Silane materials are expensive.
Dear Leila Ghorbani thanks a lot for your help, could you please suggest me an article which is about surface modification of hydrophilic nanoparticles using plasma treatment?