Anti-reflective and hydrophobic surface of self-organized GaN nano-flowers

► Self-assembled GaN nano-flowers growth using a simple CVD reactor is reported. ► Catalysis-free GaN nano-flowers using CVD is not reported elsewhere. ► Reflectance as low as 5% in comparison to 25% from GaN templates has been recorded. ► Hydrophobic surface with 145° contact angle useful for nano-fluidic devices.