Figure 5From: Structural tuning of photoluminescence in nanoporous anodic alumina by hard anodization in oxalic and malonic acidsComparison of the photoluminescent spectra of several samples fabricated in oxalic and malonic acids ( λ ex = 350 nm). (a) HA-Ox1.1 and HA-Ml1.1. (b) HA-Ox2.3 and HA-Ml2.3. (c) HA-Ox3.1 and HA-Ml3.1. (d) HA-Ox4.5 and HA-Ml4.5.Back to article page