ENGRI111_HW6_2006_solution - ENGRI 111 Solutions Homework 6...

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ENGRI 111 Solutions - Homework # 6, 2006 1. Compare and contrast the STM with the AFM. Include a) operating principle, b) type of materials appropriate for analysis, and c) ambient conditions required for analysis a) AFM – measures atomic interaction forces (van der Waals) using a cantilever probe and a laser to measure deflections - Machine.htm STM – measures the tunneling current between a conducting tip and sample b) AFM – insulators and conductors, including metals, polymers, ceramics and biological samples STM – conductors c) AFM – normal room atmosphere (although vacuum or dry environment is necessary for true atomic resolution due to
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interference from the natural water layer that forms on surfaces in an uncontrolled atmosphere). Measurements where the sample and the tip are completely immersed in liquid are also possible.
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  • Spring '07
  • Nanotechnology, researcher, carbon nanotubes, biological samples STM

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