Yes, you can! Now, if you have been wanting to know if the sensor of the Nikon D90 is any good in the IR realm, I can summarize with a short "kinda". It does take significantly longer in exposing your shots in each scene but it should yield what you are looking for with a nice Hoya R67 IR (assuming the Nikon D90 kit lens is used) filter over your lens.In this case, a tripod is mandatory. No amount of VR technology is going to help you shoot IR images handheld. Point to note - always turn to Monochrome mode, manual focus. WB should be set to custom in K values. Shoot in sunny well-lit days for ideal result.
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Have fun!