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features that would not be visible with an optical microscope, an SEM would be preferable. Finally, it’s important to think about which char- acteristics of the sample need to be understood. For instance, will SEM be used to analyse the chemical compound of the material? Are to identify defects, such as cracks and unwanted particles? Or will SEM only be required for a quick, general quality control and failure analysis process?


IDENTIFYING THE IDEAL SEM After considering these aspects, it is time to choose an SEM. Ensure that the microscope’s perfor- mance meets any required standards, by taking into account the resolution — the SEM’s ability to distinguish details in the sample. In addition to the imaging element, look for whether it offers advanced detection options such as energy-dispersive X-ray spectroscopy (EDS) for the sample’s elemental composition and electron backscatter diffraction (EBSD) for its crystallographic structure. Opting for an SEM with both solutions can give a greater insight into the chemical and physical properties of a sample, to avoid missing any potential defects.


Instrumentation Monthly November 2024


For quality engineers without extensive microscopy experience, the ideal SEM will have an easy-to-use interface, including intuitive software and controls, as well as the option to automate sample alignment. Purchasing decisions should not be limited to the physical aspects of the SEM. For those who are not yet confident in operating microscopes, it is a good idea to look for a provider that offers training opportunities to help make the most of the SEM.


To further maximise the use of the instrument, it is beneficial to choose a manufacturer that makes micro- scope service and maintenance a priority. While some components can be replaced in house, it’s best to contact a specialist engineer for complex parts. There- fore, before buying an SEM, it is essential to research how and when the solutions provider will offer assis- tance, and how long this will last. Thermo Fisher Scientific is dedicated to producing analytical scanning electron microscopes that are suited for industry specific needs, offering a wide range of versatile tools from desktop SEM to floor models. For example, Thermo Fisher’sloor standing SEM range includes the Axia ChemiSEM, which uses unique algorithms to facilitate the


collection of SEM and EDS signals simultaneously. With a resolution of 3.0 nm @ 30 kV (SE), the Axia ChemiSEM is enhanced by SmartAlign automation technology for sample alignment, allowing for faster, simpler sample characterisation. As electron microscopy experts, Thermo Fisher also offers reliable, on-demand training tailored to customer and application needs, ensuring easy adoption of its solutions. In addition, Thermo Fish- er’s NanoPorts — electron microscopy centres of excellence located across the globe — provide live demonstrations and advice on the right solution for individual applications prior to purchase. For the manufacturing industry to continuously drive material innovation and product quality, adopting scanning electron microscopy makes sense. However, knowing what to look for in an SEM solution is not always so straightforward. Thoroughly consid- ering microscopy requirements before selecting an SEM allows manufacturers to find a solution that works for them and their quality control process.


Thermo Fisher Scientific www.thermofisher.com


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