Lab 4 AFM answers - Iv Discussion Questions 1...

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Iv. Discussion Questions 1. What determines the limit of resolutionof the AFM scan? The resolution of AFM scan are limited by its lateral (x, Y) resolution and vertical (Z) resolution. Lateral resolution is limited by the tip shape and pixelization. As shown in Figure 6a and 6b, the radius ofcurvature of the end of the tip determines the highest lateral resolution obtainable, andthe sidewall angles of the tip will determine its ability to probe high aspect ratio features, while the accumulation of debris on the end of the tip would dull the tip and result in image distortion. f , Figure 6a. Image profiles of spheres scanned with a sharp (left) and dull (right) tip [I]. fQ - Figure 6b. Image prof1le of trenches scanned with a dirty tip [I]. Note that a dull or dirty tip may not affect vertical measurements. C >..;;»~:.., ,-,,"""'-, o?j:, . , I '" system scanner
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electrical, mechanical, and acoustic noise sources will also be a limiting factor in obtaining vertical resolution. 2. Explain the function of eachof the following parameters in optimizing the AFM imagein tapping mode: amplitude set point, proportional gain, and integral gain.
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