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Optical And Electrical Interactions In Self-Assembled Metal Nanoparticle

上一篇 / 下一篇 2008-06-30 03:57:28

Optical And Electrical Interactions In Self-Assembled Metal Nanoparticle Superstructures
byP%26auml;ivi Ahonen

%26copy; 2008 P%26auml;ivi Ahonen
ISBN 978-951-22-9361-2
ISSN 1795-2239
Helsinki University of Technology
Faculty of Chemistry and Materials Sciences
Department of Chemistry, FINLAND
Page: 72

Self-assembly of molecules and supramolecules is one of the fundamental phenomena in chemistry, physics, biology and material science. For example biological systems, like lipid bilayers of cell membranes and tertiary protein structures are formed by spontaneous self-assembly. Conformation and properties of these assemblies can be affected by changing the local environment of the structures. In the case of biological molecules, such an example would be protonation or deprotonation by changes in pH. When changing the conformation, one often changes the collective properties of the molecular assemblies.
In this thesis, the formation of functional nanoscale devices is approached from the self-assembly of molecules and metallic monolayer capped nanoparticles into superstructures consisting of numerous nanoparticles. Stabilisation of the individual nanosized particles is based on bonding between noble metals and thiol ligands. The desired chemical characteristics and functionality of the nanoparticles is achieved by choosing the capping ligand layer and thus, directing the interactions between the nanoparticles. Both formation and functionality of the superstructures are studied in this thesis. Syntheses of silver and gold nanoparticles capped with different ligands are included. Both the individual nanoparticles and the colloidal superstructures formed by them were characterised by transmission electron microscopy (TEM), dynamic light
scattering (DLS), zeta-potential measurements and UV-vis spectroscopy. Characterisation of the electrical properties of the self-assembled structures were carried out by scanning electrochemical microscopy (SECM).