Making pure Al through any solvent route is not possible because of negative redox potential of Al. Mostly you will end up with some compund (mostly Al2O3) and in your case AlH3. If you got AlH3, it is easy to thermally decompose that to get Al (~ 160C).
Suitable surfactants may be added to stabilize the Al Nano crystalline material along with reducing agent which you are using. Al is metal it is reactive and difficult to get pure Al particles with out stablizers or so.