SEM - GERMAN JORDANIAN UNIVERSITY SCHOOL OF TECHNOLOGICAL...

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GERMAN JORDANIAN UNIVERSITY SCHOOL OF TECHNOLOGICAL SCIENCES INDUSTRIAL ENGINEERING DEPARTMENT Material Science Laboratory "Scanning Electron Microscope" Objective Get familiar with Scanning Electron Microscope. Study SEM's operating principle. Notice some SEM's applications. Introduction The Scanning Electron Microscope, SEM, is a microscope that uses electron beam rather than light to form an image. SEM produces images of high resolution, which means that closely spaced features can be examined at a high magnification. An illustration for SEM is shown in Figure 6.1. Specimen preparation for SEM examination Preparation of samples is relatively easy. The sample to be examined must be prepared. Preparation process follows these main steps: Removal of all water, solvents, or other materials that could vaporize while in the vacuum. Firmly mount all the samples. Non-metallic samples, such as bugs, plants, fingernails, and ceramics, should be coated so they are electrically conductive. Metallic samples can be placed directly into the SEM. Figure 6.1: SEM SEM environment When SEM is used, the column must always be at a vacuum. There are many reasons for this. If the sample is in a gas filled environment, an electron beam cannot be generated or maintained because of a high instability in the beam. Gases could react with the electron source, causing it to burn out, or cause electrons in the beam to ionize, which produces random
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SEM - GERMAN JORDANIAN UNIVERSITY SCHOOL OF TECHNOLOGICAL...

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