Visible Photoluminescence of Variable-Length Zinc Oxide Nanorods Embedded in Porous Anodic Alumina Template for Biosensor Applications

Zinc oxide (ZnO) and porous anodic aluminum (PAAO) are technologically important materials, rich with features that of interest in optical applications, for example, light-emitting sensing devices. Here, we present synthesis method aligned ZnO nanorods (NR) 40 nm diameter variable length 150 to 500 range obtained by atomic layer deposition (ALD) pores continuously thickness PAAO. The relative intensity yellow (1.99 eV), green (2.35 blue (2.82 eV) photoluminescence (PL) components originating from the different types defects, varied non-monotonic dependency on composite film a Fabry–Pérot like modulation. variation any individual PL component correlated well anti-reflective properties NR–PAAO at peak wavelength particular component. This provides route selective enhancement or suppression color hybrid fluorescent emitters tuning only geometric parameters, potential use imaging other As an application example tested vascular endothelial growth factor (VEGF) using widely accessible fluorescence microscopy setup. reduced response increased VEGF concentrations, whereas remained invariant.