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Changing Conductive Properties by Diffusion (Middle and High School curriculum lesson)

In the semiconductor industry scientists take advantage of diffusion to “dope” or introduce atoms into a silicon wafer to change its conductive properties. The lesson simulates the diffusion of a gas phase substance (ammonia) into a solid substrate (gelatin) and compares the lab model of diffusion to the doping process of silicon wafers. Students will examine how diffusion occurs and explore how the electrical properties of semiconductors are developed. This lesson uses only commonly available substances.

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Scientific Image - Indium Arsenide Nanowire Field-Effect Transistor

This scanning electron microscope image shows an indium arsenide (InAs) nanowire field-effect transistor.

Semiconductor nanowires such as those of indium arsenide (InAs) offer exciting possibilities for the electronic systems of the future because of the unique possibilities they offer for controlling fundamental properties during generation. A wide range of nanowire-based devices and systems, including transistors, circuits, light emitters, and sensors, have already been explored. Nanowire field-effect transistors have been of particular interest as vehicles for the investigation...

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Exploring Materials - Graphene

"Exploring Materials - Graphene" is a hands-on activity in which visitors use tape and graphite to make graphene and test the conductivity of graphite. They learn that graphene is a single layer of carbon atoms arranged in a honeycomb pattern. There are two versions of this activity, one that uses an LED to test the conductivity and one that uses a buzzer.

"Explore Science - Zoom info Nano Draw a Circuit" (2016) version designed for groups and community outreach.

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