Plasmonic Surface Modifications with Hard-Core/Soft-Shell Nanoparticles

The main scope of this thesis is the creation of functional surfaces with hard-core/soft-shell plasmonic colloidal building blocks in respect of optical surface functionalization. With the focus on bottom up surface modification using self-assembly and template assisted self-assembly techniques. The optical functionalities are introduced by plasmonic nanoparticles and tailored either via the deposition or via chemical post-modification. The colloid types, which are used in this framework, are hard-core/soft-shell colloids. An advantage of such hybrid particles is the plurality in functionalities. The optical properties are introduced by the usage of either silver or gold nanoparticles as core material encapsulated in a micro gel. Silver and gold show a so-called "localized surface plasmon resonance" (LSPR). This resonance is also present if such particles are deposited on surfaces. This makes them interesting for sensing applications, for instance surface enhanced Raman spectroscopy (SERS) and refractive index sensing or other applications like wave guiding, light harvesting in photovoltaic or monitoring catalysis. The soft polymeric poly(N-isopropylacrylamide) shell contributes a multitude of other advantages. The shell prevents the plasmonic cores from aggregation and is stimuli responsive to changes in temperature, pH, or ionic strength. Additionally it acts as a spacer for the plasmonic cores to keep their individual optical properties. The deformable shell allows surface modifications inaccessible for hard sphere systems. The permeability of the gel network supports a chemical post-modification of the pre-assembled cores. This thesis will demonstrate how glass surfaces can be altered with these colloidal building blocks for a variety of purposes.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Bayreuth

Year

2015

Author dc:creator

• Müller, Mareen B.

Contributors dc:contributor

• Fery, Andreas

Repository record source_url

https://epub.uni-bayreuth.de/id/eprint/2489/

OAI identifier oai:identifier

oai:epub.uni-bayreuth.de:2489