UPNA campus iberus – Academica-e
Contribution to the development of functional nanostructured coatings based on silver nanoparticles


This thesis is focused on the synthesis of silver nanoparticles (AgNPs) and their further incorporation into thin films using two alternative methods, the In Situ Synthesis (ISS) process and the Layer-by-Layer Embedding (LbL-E) deposition technique. A precise control of several parameters such as the shape, size, aggregation state or distribution of the AgNPs into the films has a great influence in the wavelength position of the Localized Surface Plasmon Resonance (LSPR) of the AgNPs. With this aim, two deposition methods such as sol-gel process and Layer-by-Layer (LbL) assembly have been studied and applied in order to deposit different nanocoatings based on AgNPs onto glass slides and optical fibers. In addition, these thin films that incorporate AgNPs
have been studied for two different applications. The first application is the fabrication of efficient antibacterial surfaces. The second application is the implementation of new optical fiber sensors based on the incorporation of these AgNPs in nanostructured films, making possible to obtain and display two optical resonances, (LSPR) and Lossy Mode Resonances (LMR), in the same device.

In situ synthesis (ISS) of the silver nanoparticles into a hybrid sol-gel matrix

The PAA polymeric solution was prepared using ultrapure water and its concentration was varied from 1 mM to 20 mM respect to the repetitive unit. The molar ratio in the initial precursor solution of TEOS:EtOH:PAA was 0.11:0.77:0.12 and was aged for one day at room temperature. Then, the substrates (glass slides) were immersed into the precursor solution for 15 seconds and lifted from the solution at a speed of 0.4 cm/s using a ND-DC dipcoater from Nadetech Innovations.


Keywords: Silver nanoparticles; In situ synthesis process; Layer-by-layer embedding deposition technique; Antibacterial surfaces; Optical fiber sensors