Physical Vapour Depositin (PVD) and Biomimetic Processing often give rise to nano rods of silver and gold.

Thanks Abdil and Ojha ji for your valuable suggestions. Surely I will check these papers.

In my view, the best and simplest way to synthesize ZnO nanorods is to calcine. It is my publication.

http://www.sciencedirect.com/science/article/pii/S0167577X14000445

Electrodeposition can also be a good option though depends on the material to be deposited.

I have recently seen one paper in alloys and compounds preparing nanorods by chemical method. I have attached the same go through it

Thanks Fung, Rahman ji and Satish ji for your valuable suggestions.

Thank you Demalya ji for your valuable suggestion.

Dear Sudip am attach a paper with this reply, check whether its useful or not.

Thanks Mr. Dhanesh for the article.