Lecture 3 - Intro to Nanotechnology

Lecture 3 - Intro to Nanotechnology - MSE 803: N...

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Unformatted text preview: MSE 803: N ANOMATERIALS AND N ANOTECHNOLOGY Professor Xudong Wang 213 MSE Building Spring 2010 Class 3 Introduction to Nanotechnology Top Down Process Top-down techniques take a bulk material, machine it, modify it into the desired shape and product Manufacturing of integrated circuits Lithography, Etching, Milling, Ion implantation Precise control, reliable and repeatable fabrication process High hardware and circumstance requirement, high cost, complex processes. 2 μm Bottom up Process Build objects from basic materials Self-assembly, low cost Not completely proven in manufacturing yet Promising for nanostructure synthesis and complex 3D nanostructures. Need more understanding of the mechanism thus more control overall. Formation of nanostructure from atoms/molecules Thin film deposition Organizing of nanoparticles into ordered structure. Somewhere in between Glancing Angle Deposition (-) Charged Substrate------------------ Y Y Y Y Y Y Y Y Y Charged Substrate------------------ Si Substrate------------------ AFM tip Feynmann’s speech Dip-pen lithography Direct 3D writing Quantum Dots Nanowire Nanodevices Nano-Bio Renewable Energy N OVEL A PPLICATIONS OF N ANOMATERIALS AND N ANODEVICES Nanoparticle Toolbox Semiconducting Quantum Dots -- (Optical) Metallic Nanoparticles (Plasmon Resonance Scattering) Metal Oxide (super-paramagnetic) Organic/Polymeric Nanoparticles (Drug Delivery and Targeting) Multifunctional Nanoparticles – Imaging, Detection and Treatment Buis model for SC QD: • A heavy hole, J=3/2 • B light hole, J=1/2 • C split-off band, J=1/2 Transition energy relative to first excited state as function of particle size: R Optical Model of Semiconducting QDs Quantum Dots Basics Size/composition tunable emission spectra Available in virtually unlimited number of well-separated colors, all excitable by a single light source Tunable light emission observed in semiconductor quantum dots. This image shows ten distinguishable emission colors of ZnS- capped CdSe quantum dots excited with a near-UV lamp. From left to right (blue to red), the emission maxima are located at 443, 473, 481, 500, 518, 543, 565, 587, 610, and 655 nm. QDs for Biological Application: Challenges Aqueous environment in biological systems requires hydrophilic QDs...
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This note was uploaded on 03/23/2010 for the course MATERIAL S 803 taught by Professor Samuel during the Spring '10 term at Wisconsin.

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Lecture 3 - Intro to Nanotechnology - MSE 803: N...

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