Schubert's complete works are listed here -
http://www.universitymusicedition.com/schubert.html
and as you will see if you check it out, he didn't write any nocturnes.
Nocturnes were first written by a contemporary of Schubert named John Field, (you can check him out on
http://www.campusprogram.com/reference/en/wikipedia/j/jo/joh n_field.html) and the most famous writer of them was Frederic Chopin...see
http://www.chopinfiles.com/nocturnes.html to find out about him; you can hear them online at that url