Microscopy
Scanning Electron Microscopy (SEM) Testing
SEM testing produces high-resolution surface images for studying morphology, particle shape, fractures, coatings, and microstructural features in solid samples.
RNDgrid coordinates SEM and FESEM analysis through qualified partner laboratories. The method scans a focused electron beam across a prepared specimen and records signals generated at the surface. The right preparation, accelerating voltage, magnification, detector, and optional EDX requirement should be agreed before testing so that images answer the research question rather than simply look detailed.
When this method is useful
- Powders, particles, catalysts, metals, ceramics, polymers, composites, coatings, and fracture surfaces
- Surface morphology, particle shape, agglomeration, porosity, cracks, interfaces, and failure analysis
- Researchers who may also need elemental screening by EDX at selected locations
What the report can include
- Micrographs at agreed magnifications with scale bars and instrument conditions
- Surface morphology observations and representative fields of view
- Optional point, area, line, or mapping EDX results when requested and technically suitable
Sample preparation and scoping
- Samples should be dry, stable under vacuum, and free from loose contamination unless a special environmental method is agreed.
- Non-conductive materials may require gold, platinum, or carbon coating; coating choice can affect later elemental analysis.
- Provide the feature size, magnification range, orientation, and number of areas required before quotation.
Limitations to consider
- SEM primarily shows surface or exposed cross-section morphology; it does not directly identify crystal phases.
- Poor preparation, charging, contamination, or unrepresentative sampling can create misleading features.
- EDX detection and quantification depend on element, matrix, geometry, standards, and operating conditions.
Capabilities, detection limits, accreditation scope, and turnaround vary by method and partner laboratory. Confirm the final scope in the quotation before sending samples.
Questions to answer before booking
- Do you need morphology only, or morphology plus elemental information?
- Is the sample conductive, vacuum-compatible, and safe to handle?
- Which feature size, areas, orientations, and magnification range matter?
Related methods
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