A ceramic capacitor should be fine. You should feel free to experiment with different values or multiple caps in parallel, but remember that the datasheet recommends .1uF as a starting point.When a certain type of capacitor is recommended you should expect that the datasheet will state that explicitly.
The data sheet says 4.7uf?
I don't think you can use the output of that receiver raw, its just the demodulated signal. The microcontroller should be looking for valid code patterns from that pin. What IR transmitter are you using?
Even with an encoded a message over that modulated frequency the receiver will screw things up if its frequently showing active signals at random.