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Nanostructured Assemblies Based On Metal Colloids And Monolayers: Preparation, Characterisation And Studies Towards Novel Applications

Electronic Theses of Indian Institute of Science

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Title Nanostructured Assemblies Based On Metal Colloids And Monolayers: Preparation, Characterisation And Studies Towards Novel Applications
 
Creator Devarajan, Supriya
 
Subject Surface Chemistry
Nanoparticles
Nanostructured Films
Self-Asembled Monolayers (SAMs)
Surface Enhanced Raman Scattering (SERS)
Bimetallic Particles
Nanobimetallic Particles
Bulk Metallic Substrates
Au-Ag
Nanometallic Clusters
Bimetals
 
Description Nanoscience dominates virtually every field of science and technology in the 21st century. Nanoparticles are of fundamental interest since they possess unique size- dependent properties (optical, electrical, mechanical, chemical, magnetic etc.), which are quite different from the bulk and the atomic state. Bimetallic nanoparticles are of particular interest since they combine the advantages of the individual monometallic counterparts.
The present study focuses on bimetallic nanoparticles containing gold as one of the constituents. Au-Pd, Au-Pt and Au-Ag bimetallic/alloy nanoparticles have been prepared by four different synthetic methods, and characterised by a variety of techniques, with an emphasis on Au-Ag alloy systems in the solution phase as well as in the form of nanostructured films on solid substrates. Au- Ag alloy nanoparticles have been used to demonstrate two different applications. The first is the use of Au-Ag monolayer protected alloy clusters in demonstrating single electron charging events in the solution phase as well as in the dry state. Single electron transfer events involving nanosized particles are being probed extensively due to their potential applications in the field of electronics. The second is an analytical application, involving the use of trisodium citrate capped Au-Ag alloy hydrosols as substrates for surface enhanced Raman and resonance Raman scattering [SE(R)RS] studies. The sols have been used for single molecule detection purposes.
Various organic molecules such as quinones, phthalocyanines and methyl violet have been self- assembled in a stepwise manner on the nanoparticulate as well as bulk Au, Ag and Au-Ag surfaces, and characterised extensively by spectroscopic, electrochemical and spectroelectrochemical techniques.
 
Publisher Indian Institute of Science
 
Contributor Sampath, S
 
Date 2005-12-08T06:34:58Z
2005-12-08T06:34:58Z
2005-12-08T06:34:58Z
2005-07
 
Type Electronic Thesis and Dissertation
 
Format 7327323 bytes
application/pdf
 
Identifier http://etd.iisc.ernet.in/handle/2005/176
402096043
 
Language en
 
Rights I grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.