chiruanku:
I am using two 60 rpm geared motor to run a robot using an l293d motor driver IC. I am using a 9V battery but the robot is not moving forward. Do I use 12 V instead of 9V to run . Please suggest
No, 9V are perfectly fine for a L293d driver, the issue is somewhere else.
You can still try with 12V, but this won't solve the "real" issue.