NANO Week District 205

What is Nanotechnology?  Understanding and using objects that are less than 100 nm in size  Nanotechnology can be used in (let’s talk about applications and implications)  Medicine  Electronics  Environment  Anything!

Our Goals…  To increase your awareness about the field of nanotechnology.  To share with you our excitement about research.  To encourage you to consider careers in science and engineering.

Let’s get on the same page!  How many nanometers can fit inside one meter?  Name the smallest thing you can see with your eyes?  What is the thickness of one strand of hair?  What is the size of the wavelength of light? We will talk about the questions and give the answers after the movie clip!

What is nano?

The size of objects and the EM spectrum \ “Arrange the objects from largest to smallest, left to right.”  Eiffel Tower  Atomic Nuclei  Human  Molecules  Pinpoint  Protozoans  Honey Bee  Atoms Understanding size - Where do they fit on the wavelength scale?

Object and Source Matching  Eiffel Tower  Atomic Nuclei  Human  Molecules  Pinpoint  Protozoans  Honey Bee  Atoms

Why should you care about nanoscience in our world?

target source detector …sometimes you’ll need a lens How do we see an object? Can we see nano objects?

Requirements of Vision  The light that reaches the eye must have a color(wavelength) between red (760nm) and blue (400nm) – or a mixture of these colors.  The light that reaches the eye must be sufficiently bright – usually requires a sufficiently bright source visible wavelength in nm

Seeing Atomic Structure  Light must be about 0.1nm in wavelength to see atomic structure: x-rays  Our eyes can’t detect x-rays - 0.1nm light - (5000 times smaller wavelength than we can see)  Options Use x-rays and detector (to replace the eye) Use particles (e.g. electrons) and detector  Electrons of the appropriate wavelength are easier to produce and better focusing compared to light Scanning Electron Microscope (SEM)  Imaging techniques Atomic Force Microscope (AFM) Scanning Tunneling Microscope (STM)

Our Suite of Instruments to “see” surfaces SEM S canning E lectron M icroscope AFM A tomic F orce M icroscope STM S canning T unneling M icroscope

Scanning Electron Microscope (SEM) (1)Focus a beam of electrons on the surface, (2)Collect the backscattered electrons from the surface of the sample, (3) Observe a visual map of a computer generated image

Atomic Force Microscope (AFM) (1)Focus a beam of light on the back of a lever, (2)Collect the height deflections based on force interactions between the tip and the sample surface, (3)Observe a visual map of a computer generated image

Scanning Electron Microscope (STM) (1)Apply a voltage to the tip of a wire, (2)Observe and measure the tunneling current between the tip and the sample surface, (3)Observe a visual map of a computer generated image

Thank you!