What We Do In My Lab

What we do in my lab Optical Materials Source: www.nanotech-now.com/current-uses.htm Source: stm.lbl.gov/Salmeron_group/homeold.html Source: www.godunov.com/bucky/fullerene.html Source: www.aip.org/png/2003/186.htm Source: web.gc.cuny.edu /dept/engineering/ Faissal Source: scienceblogs.com /.../04/pining_for_the_sun.php

We want to make
Optical Protection
For protection from lasers
Solar Cells
For making electricity
Source: www.howstuffworks.com/solar-cell.htm

What we do:
We make nano sized crystals, called quantum dots
We connect them with carbon nanotubes , which act as wires
We make plastic films which hold our quantum dots and carbon nanotubes
We test our films as optical protection , and as solar cells

We start with crystals Source: www.faeriesfinest.com/B947.html Source: commons.wikimedia.org/wiki/File:Rock_salt_crystal.jpg Crystals can look like this: The crystals that we make are nanometers in size! We call these nanocrystals Quantum Dots .

How small is a nanometer?
How small is small?
Source: http://cobweb.ecn.purdue.edu/~janes/whats_nano.htm

We take Atoms from Salts to make our Quantum Dots Cadmium From Salt Selenium From Salt Cadmium Selenide ( CdSe ) Source: http://www.astro.virginia.edu/class/oconnell/astr121/cosmic-history-narrative.html +

Our Quantum Dots look like this: In the Laboratory: We cannot see our Quantum Dots . Here are the models of our nanocrystals Source: Published online: 25 January 2004; doi:10.1038/nmat1056

Our crystals are so small, they need protection, so they do not get destroyed
They are protected by chemicals that are like soap, which cover the crystals
Source: Pileni, Marie-Paule, Nature Materials 2, 145–150 (2003)

Quantum Dots are Interesting:
Smaller dots look BLUE, and larger dots look RED , under ultra violet light:
Source: www.nanotech-now.com/current-uses.htm

We also work with Carbon Nanotubes Source: Mat. Res. [online]. 2008, vol.11, n.3 [cited 2009-07-15], pp. 325-333 Carbon Nanotubes in the Lab Carbon Nanotube Model

Buckyballs!
The idea for carbon nanotubes came from balls made of carbon atoms: these balls were called Buckyballs!
Source: www.godunov.com/bucky/fullerene.html

Carbon nanotubes look like this: Source: www.aip.org/png/2003/186.htm

We make nanocomposites Source: www.nanotech-now.com/current-uses.htm

We make thin films of plastic, with quantum dots and carbon nanotubes in them
This is our machine for making thin films:
It spins coatings of films, one layer at a time

We test our films using a LASER Source: www.laseroffers.com/what-is-laser/ Source: http://www.rp-photonics.com/lasers.html

We move our films through a focused laser to see how their properties change Source: www.microscopy-uk.org.uk/primer/geomop.htm

We measure changes in: Source: http://www.sciencebuddies.org/science-fair-projects/project_ideas/Phys_p028.shtml Refractive Index: Source: http://www.tcd.ie/Physics/opticslab/facilities/z_scan.php Absorption coefficient (using two photon absorption): Source: http://www.hyperzoid.com/csc492/microscopy.html

A little bit about light
The Electromagnetic Spectrum:
Source: http://www.onpointlasers.com/laser-basics

Getting Light from an Atom Source: https://reich-chemistry.wikispaces.com/422-002+D.+Thibault+and+J.+Brock+Big+Time+Line+Project

Hydrogen Spectra Source: http://www.goiit.com/posts/list/community-shelf-the-bohr-atom-917720.htm

A little bit about LASERS Source: http://www.phy.cuhk.edu.hk/phyworld/articles/laser/laser_e.html Electron transitions in an atom: Schematic Diagram of a Ruby Laser: Comparing laser and ordinary lamplight:

To recap, this is what we do:
We make nano sized crystals, called quantum dots
We connect them with carbon nanotubes , which act as wires
We make plastic films which hold our quantum dots and carbon nanotubes
We test our films as optical protection , and as solar cells
You can see other pictures from my lab here: http://www.flickr.com/photos/faissal_bd/sets/72157621760317409/

What We Do In My Lab

by Faissal aka Md. Halim on Nov 25, 2009

Accessibility

Categories

Tags

Upload Details

Usage Rights

1 Embed 3

Statistics

What We Do In My Lab — Presentation Transcript