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IM-SURE Fellow: Georges Siddiqi

Study of Self Assembled Nanoparticle Arrays on Diblock Copolymer Templates. IM-SURE Fellow: Georges Siddiqi Department of Chemical Engineering University of California, Los Angeles. Mentor: Professor Regina Ragan Post-Doctoral Researcher: Dr. Ju H. Choi

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IM-SURE Fellow: Georges Siddiqi

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  1. Study of Self Assembled Nanoparticle Arrays on Diblock Copolymer Templates IM-SURE Fellow: Georges Siddiqi Department of Chemical Engineering University of California, Los Angeles Mentor: Professor Regina Ragan Post-Doctoral Researcher: Dr. Ju H. Choi Department of Chemical Engineering and Materials Science University of California, Irvine

  2. Outline • Our motivations • Introduction to concepts • Project goals • Experimental outline • Results and discussion

  3. Motivation • Existing biosensors are large, mechanically complicated and expensive • Difficult, time consuming and expensive to detect many biological molecules • Create biosensors that are both • Cost effective • Highly sensitive

  4. Introduction • Use plasmon resonance spectroscopy to create highly sensitive biosensors Van Duyne R.P. et al,Nano Lett., Vol. 4, No. 6, 2004

  5. Introduction • Diblock copolymers form two distinct phases depending on fraction of each • Using poly(styrene-b-methyl methacrylate) (PS-b-PMMA)

  6. Introduction • Combine diblock copolymer templates with nanoparticles PMMA PMMA PS Creates cost effective templates • Combine nanoparticle arrays with plasmon resonance spectroscopy Creates highly sensitive biosensor

  7. PMMA Polymer substrate Project Goals • Three goals for this project: • Create size-controlled nanoparticles • Create diblock copolymer • Attach nanoparticles (What I did) Monolayer protected Au/Ag nanoparticle synthesis Diblock-copolymer templates (PS-b-PMMA)

  8. Experimental Outline • Convert –COOCH3 group to carboxylic acid • React with EDC and Sulfo-NHS to form amine reactive ester • Attach functionalized nanoparticle

  9. Results • Initial Results

  10. Results • Complications with morphology

  11. Results • Control of film thickness

  12. Results • Problems with template damage and their solutions

  13. Results • Problems with nanoparticle aggregation

  14. Results • Controlling nanoparticle size Expected NP size ~10nm Expected NP size ~20nm

  15. Results • Finally some good stuff

  16. 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

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