To obtain superhydrophobic surface, aluminum oxide was deposited onto wool fabrics using atomic
layer deposition (ALD) by exposing them to alternating pulses of trimethylaluminum and water at 80 ◦C.
Scanning electron microscope (SEM) and X-ray fluorescence (XRF) analysis showed that Al2O3 layer and
uniform Al2O3 nanoparticle were formed around the surface of ALD coated wool fiber, which showed
higher surface roughness than control wool fiber. The static water contact angles of ALD coated wool
fabrics increased from 130◦ to around 160◦, and had a higher durability than that of control wool fabric.
The dynamic water contact angles of all samples were also tested. Furthermore, the common household
liquids also existed as ball-like droplet on the ALD coated wool fabrics and as stain spot on the control
wool fabrics after exposure for 1800 s.