Scanning Electron Microscopy Techniques in Nanometrology

Scanning electron microscopy (SEM) has become an indispensable tool in nanometrology by combining high-resolution imaging with surface-sensitive contrast mechanisms. Utilising interactions between a focused electron beam and specimen, SEM can resolve features down to a few nanometres and produce quantitative measurements of topography, composition and dimensions. Advances in detector technology, vacuum systems and beam control now enable in situ measurements under variable temperatures and pressures, while integration with focused ion beam (FIB) milling allows three-dimensional reconstructions of complex nanostructures. Key challenges remain in achieving traceable calibration, minimising beam-induced artefacts and improving throughput for industrial metrology. Recent improvements in machine-learning image analysis and automated stage control have enhanced precision, facilitating routine characterisation of semiconductor devices, nanocomposites and two-dimensional materials. The global significance of SEM-based nanometrology lies in its ability to underpin quality control for emerging technologies and to drive discoveries in materials science, electronics and life sciences.

Research from Nature Portfolio

Recent studies have demonstrated the integration of machine-learning algorithms with secondary electron imaging to automate defect detection and dimensional measurements at sub-10-nanometre scales. By training convolutional neural networks on high-contrast SEM datasets, researchers achieved measurement uncertainties below 1 nm, offering a pathway to rapid, real-time feedback in semiconductor fabrication.

Another investigation explored in situ heating within an environmental SEM to monitor thermal expansion and phase transitions of metallic nanowires. Precise stage calibration and drift correction enabled quantification of dimensional changes with nanometre accuracy up to 800 °C, revealing new insights into size-dependent melting dynamics.

A third contribution combined electron backscatter diffraction with high-resolution SEM imaging to map crystallographic orientations in polycrystalline thin films. By correlating orientation maps with grain boundary morphology, the work provided a metrological framework for tailoring electrical and mechanical properties in flexible electronics.

Research from all publishers

A study in a leading journal introduced a multi-modal approach coupling SEM with energy-dispersive X-ray spectroscopy for element-specific thickness measurements of layered two-dimensional materials. This method achieved thickness resolution better than 0.5 nm by calibrating X-ray yield against reference standards and correcting for beam broadening effects.

Work from an international consortium developed a novel FIB-SEM slice-and-view protocol for three-dimensional nanometrology of porous catalysts. Through automated image registration and volume reconstruction, pore size distributions and connectivity were quantified with voxel dimensions under 5 nm, informing design principles for energy-conversion applications.

Foundational research addressed metrological traceability in SEM by proposing a new calibration routine based on nanoparticle size standards. Using a combination of transmission electron microscopy and SEM measurements of gold spheres, the approach established a rigorous uncertainty budget and promoted cross-laboratory consistency.

Scanning Electron Microscopy Techniques in Nanometrology publication trend

The graph below shows the total number of articles in scanning electron microscopy techniques in nanometrology across all publications each year (not limited to Nature Index journals).

Technical terms

Secondary electrons: Low-energy electrons emitted from the specimen surface that provide high-resolution topographic contrast.

Backscattered electrons: High-energy electrons reflected from atomic nuclei, used to distinguish compositional or crystallographic variations.

Nanometrology: The science of measurement at the nanoscale, encompassing dimensional, compositional and structural characterisation.

Field emission gun (FEG): An electron source that produces a highly coherent and stable beam, improving resolution and reducing aberrations.

Focused ion beam (FIB): A technique that uses a concentrated ion beam to mill or deposit material, enabling 3D imaging and sample preparation.

Traceable calibration: A measurement procedure linked through an unbroken chain of comparisons to recognised standards, ensuring accuracy and reproducibility.