IM-SURE Fellow: Georges Siddiqi Department of Chemical Engineering University of California, Los...
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IM-SURE Fellow: Georges SiddiqiDepartment of Chemical Engineering University of California, Los Angeles
Mentor: Professor Regina RaganPost-Doctoral Researcher: Dr. Ju H. ChoiDepartment of Chemical Engineering and Materials ScienceUniversity of California, Irvine
Study of Self Assembled Nanoparticle Arrays on
Diblock Copolymer Templates
Outline
•Our motivations•Introduction to concepts•Project goals•Experimental outline•Results and discussion
Motivation
• Create biosensors that are both• Cost effective• Highly sensitive
• Existing biosensors are large, mechanically complicated and expensive
•Difficult, time consuming and expensive to detect many biological molecules
Introduction
•Use plasmon resonance spectroscopy to create highly sensitive biosensors
Van Duyne R.P. et al, Nano Lett., Vol. 4, No. 6, 2004
•Diblock copolymers form two distinct phases depending on fraction of each
•Using poly(styrene-b-methyl methacrylate) (PS-b-PMMA)
Introduction
Introduction
•Combine diblock copolymer templates with nanoparticles
PMMA PMMAPS
Creates cost effective templates
•Combine nanoparticle arrays with plasmon resonance spectroscopy
Creates highly sensitive biosensor
PMMA
Polymersubstrate
Project Goals
•Three goals for this project:•Create size-controlled nanoparticles•Create diblock copolymer•Attach nanoparticles
Monolayer protected Au/Ag nanoparticle synthesis
Diblock-copolymer templates (PS-b-PMMA)
(What I did)
•Convert –COOCH3 group to carboxylic acid
Experimental Outline
•React with EDC and Sulfo-NHS to form amine reactive ester•Attach functionalized nanoparticle
Results
•Initial Results
Results
•Complications with morphology
Results
Spin speed &Conc. of PS-b-PMMA
3000 rpm 4000 rpm 5000 rpm
1 wt% 55nm(70%)
50nm (60%)
49nm (64%)
2 wt% 88nm(92%)
88nm(87%)
85nm(75%)
•Control of film thickness
Results
•Problems with template damage and their solutions
Results
•Problems with nanoparticle aggregation
Results
•Controlling nanoparticle size
Expected NP size ~10nm Expected NP size ~20nm
Results
•Finally some good stuff
Acknowledgements
•Professor Regina Ragan•Dr. Ju H. Choi•Jere. A Wilson for some bangin’ NPs•UCI IM-SURE Program•NSF REU Program•Carl Zeiss Center of Excellence