I am not aware of any - and given his advocacy of devotion and surrender, it would be surprising if he did not compose any.
So - what are some of his devotional works?
Yes, Sripad Ramanujacharya composed a total of three devotional works, which are collectively known as "Gadyatrayam works":
1) Sharanagati Gadyam, which espouses surrender to Sriman Narayana's lotus feet. You can read it here.
2) Sri Ranga Gadyam, which is a devotional work describing the auspicious qualities of Sri Ranganatha (Sriman Narayana). You can read it here.
3) Sri Vaikuntha Gadyam, which is a devotional work describing Paramapadam and the position of liberated souls. You can read it here.