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* Nanotechnology and Nanosensors

Week 1: Introduction to Nanotechnology, Part 1

The cut-off limit of human eye to see is 10000nm. The size of red blood cells is 7000-8000nm. 2013 budget for the U.S. National Nanotechnology Initiative was 1.8 bilion. DNA molecule structure contain millions of atoms. Carbon nanotubes are 100 times stronger than steel at one-sixth of the weight. Carbon nanotubes (in air) have the ability to sustain temperature as high as 3000 digree of celsius The use of nanotechnology reduces computer’s price and power consumption and enhances speed and performance. Nanotechnology enabled printing of the Old Testimony on area of 100 square nanometers. When the size of an object decreases, the ratio between atoms on the surface and atoms in the bulk increases.

1.1 Definitions and Nanomaterials [15:36]

nano - 10 e-9 nanotechnology - 1-100nm finger nail grows 1nm per second red blood cell = 10000nm

1. In nanomateerials the surface/boundary/interface plays an important role!. 1x1 santimenter cube, total surface area is 6 sm ^ 2 1x1 mm cubes, area = 60 sm ^ 2 1x1 nm cubes, area = 60 000 000 sm ^ 2
2. Surface are to volume ratio Silicon (Si) has diamond structure with a = 5.43A 10x10nm Si nanocube on a side is composed of: 6250 unit cells, 50000 atoms
3. Chemical active Since many more molecules are located on the surface are in energetically unstable

1.2 Nanostructures: 0-D and 1-D [9:47]

Nanostructure is a term that includes materials that has a size in 1, 2 or 3-dminensions of approx. 1-100nm.

1. 0D - Clusters Nanoparticles; Quantum dots Nanoclusters consisting of up to a couple of hundred atoms, but larger aggregates containing 1000 or more atoms are called Nanoparticles.
2. 1D - Nanotubes, fibers and rods

Carbon nanotube Boron nitride nanotube SiC nanotubes

1. 2D - Films and coats
2. 3D - Polycrystals

1.3 Nanostructures: 2-D and 3-D [8:01]

Quizzes: week 1

Week 2: Introduction to Nanotechnology, Part 2

2.1 Characterization Tools for Nanotechnology [29:31]

2.2 Fabrication in the Nano-scale–Top Down Fabrication [18:59]

2.3 Fabrication of nano-scale structures and devices – Bottom Up Fabrication [20:50]