Three-dimensional gallium nitride nanoflowers supports decorated by gold or silver nanoparticles to fabricate surface-enhanced Raman scattering substrates

3D metal-semiconductor nanostructures as SERS substrates were designed by in situ electrodeposition of AuNPs or in situ photodeposition of AgNPs on GaN nanoflowers supports fabricated by metal-assisted photochemical etching of single crystalline GaN.