AI SearchCharacterization of layer-by-layer electrostatically self-assembled thin films of chitosan capped gold and silica nanoparticles on conducting substrates and its potential application as a press sensor
Call Number: AIT Thesis no.ISE-12-55 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. ISE-12-55Publication details: Pathum Thani : Asian Institute of Technology, 2012Description: 1 online resource (58 p.) : illSubject(s): Online resources: Dissertation note: Thesis (M. Eng.) - Asian Institute of Technology, 2012 Summary: This dissertation focuses on the growth and characterization of chitosan capped goldand silica bi-layer thin films. Thin films have been prepared from colloidal nanoparticulate solutions of gold and silica. They were transferred onto solid substrates through Layer-by-layer dip-coating process,by dipping the substrates back and forth in the oppositely charged solutions using the concept of self-assembly of oppositely charged entities. Gold nanoparticles capped with polymer chitosan served as the positive entity and silica nanoparticles as the negative entity.Different sizes of silica nanoparticles were synthesized and characterized by varying the various reaction parameters. Effect of increasing silica particle size on bi-layer growth process was also studied.In order to achieve a good coating of the bilayerson the substrate, attachmentof the firstsilanemono-layer is very important. Role of different solvents was studied during silanization process. It was analysed and better attachment was obtained byoptimization of various parameters.Role of buffers on the growth of bi-layers wasstudied. Citrate and borate buffers have been used as acidic and basic buffers respectively.Finally, electrical characterization on Transparent conducting oxide substrates and metallic substrates were done to check the electrical behaviour of the stackedbi-layers.
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A thesissubmitted inpartial fulfilment of the requirements for the degree of Master of Engineering in Nanotechnology, School of Engineering and Technology
Thesis (M. Eng.) - Asian Institute of Technology, 2012
This dissertation focuses on the growth and characterization of chitosan capped goldand silica bi-layer thin films. Thin films have been prepared from colloidal nanoparticulate solutions of gold and silica. They were transferred onto solid substrates through Layer-by-layer dip-coating process,by dipping the substrates back and forth in the oppositely charged solutions using the concept of self-assembly of oppositely charged entities. Gold nanoparticles capped with polymer chitosan served as the positive entity and silica nanoparticles as the negative entity.Different sizes of silica nanoparticles were synthesized and characterized by varying the various reaction parameters. Effect of increasing silica particle size on bi-layer growth process was also studied.In order to achieve a good coating of the bilayerson the substrate, attachmentof the firstsilanemono-layer is very important. Role of different solvents was studied during silanization process. It was analysed and better attachment was obtained byoptimization of various parameters.Role of buffers on the growth of bi-layers wasstudied. Citrate and borate buffers have been used as acidic and basic buffers respectively.Finally, electrical characterization on Transparent conducting oxide substrates and metallic substrates were done to check the electrical behaviour of the stackedbi-layers.
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