High-Density Plasmonic Nanoparticle Arrays Deposited on Nanoporous Anodic Alumina Templates for Optical Sensor Applications

• DOI: 10.3390/nano9040531
• Publication Date: 2019-04-04T07:13:42Z
• Authors: Uldis Malinovskis; Raimonds Poplausks; Donats Erts; Kerstin Ramser; Sigitas Tamulevičius; Asta Tamulevičienė; Yesong Gu; Juris Prikulis
• Keywords: Nanoporous; Anodizing

This study demonstrates a new, robust, and accessible deposition technique of metal nanoparticle arrays (NPAs), which uses nanoporous anodic alumina (NAA) as template for capillary force-assisted convective colloid (40, 60, 80 nm diameter Au) assembly. The NPA density size can be independently tuned by the anodization conditions synthesis protocols. enables production non-touching variable-density NPAs with controllable gaps in 20-60 range. nearest neighbor center distance present was fixed to 100 choice protocol. obtained Au have resonant scattering maxima visible spectral range, refractometric sensitivity, variation array density. thickness NAA layer an Aluminum-NAA-NPA multilayer system further tuning resonance frequency optimization use specific molecules, e.g., avoid absorption bands. Applicability mentioned multilayers colorimetric refractive index (RI) sensing is demonstrated. Their Surface-Enhanced Raman Scattering (SERS) substrates tested using hemoglobin biological probe molecule.