1 / 12

Nanotechnology

Nanotechnology. Versatile Bottom-up Nanofabrication Technique: Layer-by-Layer Assembly. ~ Anuja Choubey 12-01-2007. Introduction. Nanofabrication Techniques. “Top-down” Photon based Nanolithography Electron Beam Lithography Focused Ion Beam Lithography “Bottom-up”

parson
Download Presentation

Nanotechnology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Nanotechnology Versatile Bottom-up Nanofabrication Technique: Layer-by-Layer Assembly ~ Anuja Choubey 12-01-2007

  2. Introduction Nanofabrication Techniques • “Top-down” • Photon based Nanolithography • Electron Beam Lithography • Focused Ion Beam Lithography • “Bottom-up” • Self Assembled Monolayers (SAMs) • Block Copolymers • Electrostatic Self-Assembly • Layer-by-Layer Assembly (LBL)

  3. Background • Langmuir-Blodgett (LB) • Expensive instrumentation • Not applicable for non-amphiphilic materials • Self assembled Monolayer (SAM) • Not suitable for multilayer fabrication • Layer-by-Layer Assembly (LBL) • Inexpensive • Simple, Easy-to-use • Enhanced modularity • Potential for greater versatility

  4. How LBL works? Ariga et al., Phys. Chem. Chem. Phys., 9 (2319–2340), 2007

  5. Materials Used • Polyions- PAH, PDDA, PSS, PVS, PAA, PPV • Proteins, DNA, Charged polysaccharides • Charged inorganic substances • Colloidal nanoparticles • Clay • Nanosheets • Modified zeolite crystals. • Charged supramolecular assemblies • Bolaamphiphile monolayers • Lipid bilayers • LB films • Stacked dye molecules

  6. Characterization • Microscopy • AFM • TEM • SEM • Optical Spectroscopy • Ellipsometry • Quartz Crystal Microbalance (QCM)

  7. Ellipsometry Quartz Crystal Microbalance A. Tronin et al., Colloid Polym. Sci., 272, 1317, 1994

  8. Applications • Anti-static coating for plastics • Sensors • Oxygen sensor • Glucose biosensor • Light emitting diode • Fuel Cells • Polymer Capsules • Micro-reactors • Targeted Drug delivery

  9. Fuel Cell Application http://web.mit.edu/hammond/lab/ashcraft.htmhttp://en.wikipedia.org/wiki/Image:Fuel_cell_still.gif

  10. Formation of Polymer Capsules E.Donath et al., Angew. Chem. Int. Ed. 37, 16(2202-2205), 1998www.coes.latech.edu/bme/research/reu/layer%20by%20layer%20assembly.htm

  11. Limitations • Fuzzy internal architecture • Sensitive to working conditions • Humidity • Drying between cycles Future Work • Synergy with other techniques • Top-down microfabrication

  12. Questions?

More Related