Looking into NexFET's for a current mirror application.

Hello all,

I am looking to amplify a current source of a couple of pico amps out of some noise (few hundred nano amps).  Would these FET's (NexFETs) work well for this type of preamplification.  The signal varies minutely (nano amps) when sampled at 10 micro seconds.  Thank you for your consideration in this.