I cant tell about nanorods but for cobalt nonodots, just take cobalt nitrate and follow the sol gel method,

Anitha Jayapal you can go for hydrothrmal method.

Dear Anitha Jayapal, these two attached Books contain in principle all about cobalt oxides. My Regards

Hi;

Please see the link below:

https://doi.org/10.1016/jset.2018.06.005.

With my best regards

Thanks a lot for all of your valuable comments.