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portada Fabrication and Characterisation of Multilayer Thin Film Using Self Assembly of Colloidal Gold and Silica Nanoparticles
Type
Physical Book
Publisher
Author
Language
English
Pages
116
Format
Paperback
ISBN13
9783668243057

Fabrication and Characterisation of Multilayer Thin Film Using Self Assembly of Colloidal Gold and Silica Nanoparticles

Zaheer Abbas Khan (Author) · Grin Verlag · Paperback

Fabrication and Characterisation of Multilayer Thin Film Using Self Assembly of Colloidal Gold and Silica Nanoparticles - Zaheer Abbas Khan

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Synopsis "Fabrication and Characterisation of Multilayer Thin Film Using Self Assembly of Colloidal Gold and Silica Nanoparticles"

Doctoral Thesis / Dissertation from the year 2011 in the subject Materials Science, Asian Insitute of Technology, language: English, abstract: A novel approach of multilayered thin film based on layer-by-layer deposition using colloidal nanoparticles was carried out in this work. The films were made by the self-assembly of oppositely charged metal and dielectric nanoparticles, alternately capped with polymers. Synthesized colloidal suspensions of gold nanoparticles ( 20nm) and silica nanoparticles ( 30nm) were used as the building blocks for the self-organisation of the films. Capping with PDDA and chitosan was used effectively to control the optical absorption of the surface plasmon resonance peaks of the gold nanoparticles. Using different combinations of layer formation, absorption characteristics in the near-ultraviolet (NUV), green and blue region were controlled through capping and varying the thickness of the film. Capping with chitosan or PDDA reduced the absorption peak of the coated silica nanoparticles in a similar fashion. Peak absorption in the UV range was achieved by assembling bare silica nanoparticles layers onto layers of gold nanoparticles. Transmission color was controlled (less than 1% color distance per added bi-layer) by changing the film thickness. Optical modeling of multilayer thin films constructed with oppositely charged nanoparticles helped us to understand phenomenon such as surface plasmon resonance, absorbance, transmittance and reflectance. Maxwell-Garnett effective medium theory in this case is applied in quasi-static limit to multilayer composite consisting of host material silica and inclusion material gold nanoparticles. Maxwell Garnett optical simulations is correlated with experimental spectra obtained for the thin film composites. The thickness of layers, size and spacing of metal inclusion is varied to alter the optical properties for the required device applications. The multilayered thin film of gold and silica resemble

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