Elemental analysis is a cornerstone in materials science, enabling researchers and engineers to determine the composition of materials at a microscopic level. Energy Dispersive Spectroscopy (EDS) is a widely used technique that, when integrated with Scanning Electron Microscopy (SEM), provides detailed insights into the elemental makeup of samples. In this blog, we will guide you through the process of using an EDS system for elemental analysis. See the video below for a walkthrough of how it’s done.
Why Use EDS for Elemental Analysis?
EDS is an analytical technique that identifies and quantifies the elemental composition of materials by detecting characteristic X-rays emitted from a sample during electron beam interaction. This method is essential for several reasons:
- Material Characterization: Understanding the elemental composition aids in determining material properties, which is crucial for applications ranging from quality control in manufacturing to research and development in various industries.
- Contaminant Detection: EDS helps identify impurities or contaminants in materials, ensuring product integrity and performance.
- Failure Analysis: In cases of material failure, EDS can pinpoint elemental anomalies that may have contributed to the issue, facilitating corrective actions.
Industries such as aerospace, automotive, electronics, and pharmaceuticals rely on EDS for tasks like verifying alloy compositions, analyzing thin films, and studying corrosive properties of materials.
Step-by-Step Guide to Performing Elemental Analysis Using EDS
The following steps outline the process of conducting elemental analysis using EDS, as demonstrated in the video above:
- Sample Preparation and SEM Setup
- Sample Preparation: Ensure the sample surface is clean and conductive.
- SEM Configuration: Load the sample into the SEM chamber and establish appropriate imaging parameters.
- Utilize the BSE Detector for Atomic Number Contrast
- BSE Imaging: Activate the SEMTech Solutions BSE detector to capture images based on atomic number contrast, which will differentiate materials more readily. Elements with higher atomic numbers scatter more electrons, appearing brighter in the image. For example, gold (Au) with an atomic number of 79 will appear brighter than silver (Ag) with an atomic number of 47. We explored this process in our previous video: How to Use a BSE Detector with SEMView8000.
- Initiate the EDS System
- X-ray Generation: When the sample is bombarded with electrons from the primary beam, the element’s orbital shell electrons are knocked out of position, leaving behind a “hole,” at which point a higher energy orbital electron fills the vacancy. During this process, the higher orbital energy electron releases energy to form an X-ray.
- X-ray Detection: These emitted X-rays are collected by the SEMTech Solutions Silicon Drift Detector (SDD), which measures the signal using Energy Dispersive X-ray (EDX) software that resides on the same PC as the SEMView8000. The benefit of one PC is that only one keyboard and mouse are required to operate both the SEM and the EDS.
- Analyze Data with EDS Software
- Data Visualization: The chemical information can be visualized in several ways in the software, including elemental mapping and line scans. In this way, X-rays can be used to identify each element that exists in a sample.
- Qualitative and Quantitative Analysis: EDS can be used for both qualitative and quantitative analysis, enabling users to identify both the type of elements that are present as well as the percentage of each element’s concentration within the sample.
- Interpret Results
- Elemental Mapping: Assign specific colors to different elements to create a visual representation of their distribution within the sample. For instance, silver (Ag) can be assigned green, and gold (Au) can be assigned blue.
- Line Scans: Analyze the distribution of specific elements along a defined line to study compositional changes across a region.
The SEMView8000 Advantage
While the EDS process can be performed without the SEMView8000, integrating it into your workflow offers several benefits:
- Unified System Operation: Operating both the SEM and EDS software on the same Windows-based computer simplifies the workflow, reducing the need for multiple interfaces and streamlining data management.
- Modern Interface: The SEMView8000 utilizes a Windows 11 platform, providing an intuitive and user-friendly interface that enhances the overall user experience.
- Data Management: Easily save, share, and review both SEM and EDS data from one centralized system, improving efficiency and collaboration.
For those unfamiliar, our previous guide on using the BSE detector with the SEMView8000 provides a strong foundation for capturing high-contrast images to prepare for EDS analysis.
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Whether you’re optimizing an older SEM or considering a refurbished system, SEMTech Solutions offers expert guidance and innovative solutions. Reach out to us to learn more about integrating EDS with your workflow or upgrading your SEM with the SEMView8000.
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Frequently Asked Questions
What is SEM-EDS (and what does it stand for)?
SEM-EDS stands for Scanning Electron Microscopy + Energy Dispersive Spectroscopy. In practice, you use the SEM to image and target a specific microscopic region, then use EDS to identify and quantify the elements present by measuring characteristic X-rays emitted when the electron beam interacts with the sample. This combination is popular because it links where a feature is (the SEM image) with what it’s made of (the EDS spectrum, maps, or line scans). If you want a workflow that keeps imaging and analysis on one system, see SEMView8000.
What does EDS do in SEM?
EDS adds elemental composition to SEM imaging. Once you’ve located an area of interest in the SEM, EDS detects the X-rays generated by beam–sample interactions and uses them to determine which elements are present and (optionally) estimate the percentage concentration of each element. Most users rely on EDS for three common tasks: material characterization, contaminant/impurity detection, and failure analysis (for example, checking an alloy, finding unexpected elements, or investigating a corrosion feature). This page’s step-by-step section walks through that exact process.
How does EDS work in an SEM?
EDS works by measuring the energy and intensity of X-rays emitted from the sample during electron-beam interaction. The beam can eject an inner-shell electron, leaving a vacancy (“hole”). When a higher-energy electron drops down to fill that vacancy, the atom releases energy as a characteristic X-ray. The EDS detector collects those X-rays and software converts them into a spectrum (peaks linked to elements) and, if you choose, elemental maps or line scans. For more context on the SEM side of the interaction, see how a scanning electron microscope works.
What is the basic principle of EDS, and how is it different from XPS?
The basic principle of EDS is characteristic X-ray emission: atoms emit X-rays with element-specific energies when the SEM beam causes electron-shell transitions. XPS (X-ray Photoelectron Spectroscopy) is different: it uses X-rays (not an electron beam) to eject electrons and measures their binding energies, which is especially useful for surface chemistry and chemical states. If your question is “what elements are present in this micro-area, and roughly how much,” SEM-EDS is often the go-to. If your question is “what’s the surface chemical state (oxidation, bonding) within the top few nanometers,” XPS is typically the better fit.
How do you perform elemental analysis with EDS step by step?
A practical SEM-EDS workflow looks like this: (1) prepare the sample so the surface is clean and stable in the SEM (often meaning it’s conductive or treated to reduce charging), then load it and set imaging conditions; (2) use imaging, often BSE contrast, to find regions where composition likely changes; (3) start EDS acquisition so the detector collects X-rays and the software builds a spectrum; (4) visualize chemistry using elemental maps and/or line scans; and (5) interpret results by validating the elements identified and checking whether the percentages and spatial distribution make sense for the material. This mirrors the “Step-by-Step Guide” already on the page.
Why use a BSE detector before (or with) EDS?
Backscattered electron (BSE) imaging is a fast way to spot atomic-number contrast before you run EDS. Higher-Z materials scatter more electrons back toward the detector and appear brighter, so BSE can help you quickly locate inclusions, plating layers, or mixed-material regions worth analyzing. Once you’ve identified those bright/dark regions in BSE, EDS can confirm which elements are driving the contrast and whether the composition varies across boundaries. If you’re upgrading contrast capability, see upgrade your SEM with a single crystal BSE detector.
How do elemental mapping and line scans work in EDS?
Elemental mapping shows where elements are distributed across an area: the software assigns colors to selected elements and builds a map that overlays your SEM image so you can see spatial patterns (e.g., a coating vs. substrate). Line scans measure how composition changes along a defined line, useful for studying diffusion zones, interfaces, or contamination gradients across a boundary. In both cases, the signal comes from X-rays collected while the beam scans, so stable imaging conditions and good sample grounding help produce clearer, more reliable maps/lines.
Can SEM-EDS be qualitative and quantitative?
Yes, EDS can be used qualitatively to identify which elements are present, and quantitatively to estimate the percentage concentration of each element in a region. Qualitative results are often the first pass (confirming peaks match expected elements), then quantitative routines apply corrections and report approximate concentrations. In day-to-day lab use, “quant” is most reliable when the sample is well-prepared, the acquisition is optimized, and the analysis settings are consistent, especially if you’re comparing results across multiple parts or lots.
What pieces of data can SEM-EDS produce about a sample?
SEM-EDS can generate several complementary outputs, depending on what you run. From the SEM side, you typically save images (often SE for topography and BSE for compositional contrast) that show exactly where you analyzed. From the EDS side, you can capture an EDS spectrum (peaks used to identify elements), plus point/area results that report estimated composition (commonly wt% and/or at%) for a selected region. For spatial chemistry, SEM-EDS can also produce elemental maps (where elements are located across an area) and line scans (how composition changes across a boundary). Most reports also include key acquisition context (like kV, working distance, and acquisition time) so results are traceable.
How do you explain or interpret SEM-EDS results?
Start by matching the result to the question you’re trying to answer: “Which elements are present?”, “Where are they located?”, or “How do concentrations change across a feature?” Then sanity-check the output in three ways: (1) confirm peaks align with realistic elements for your material system, (2) compare maps/line scans to what you see in imaging (especially BSE contrast), and (3) confirm that reported percentages are plausible for the region you analyzed. When interpretation is time-sensitive (for example, failure analysis), many teams save the SEM image, spectrum, and map overlays together so reviewers can trace conclusions back to the exact analyzed location.
What sample preparation is needed for SEM-EDS?
At minimum, SEM-EDS needs a sample that is clean, stable, and compatible with SEM vacuum and charging limits. This page specifically highlights keeping the surface clean and conductive so you can image and analyze without charging artifacts that can distort images and degrade X-ray data quality. In many workflows, the goal is simple: secure mounting, good electrical grounding, and a surface that won’t drift, outgas, or charge during acquisition. For mounting consumables used in SEM prep, see carbon tape.
Can a chemical analytical laboratory run SEM-EDS if I don’t have the equipment?
Yes, many organizations use a chemical/materials analytical laboratory when they need SEM-EDS results without maintaining in-house equipment, staffing, or calibration routines. Labs can run SEM imaging plus EDS spectra, maps, and line scans for common needs like material ID, contamination checks, and failure analysis support. If you’re looking for a lab option, see SEM Analytical Service Laboratory (STS Analytical Testing Laboratory), which lists SEM/EDS capabilities and typical service use-cases
