Nanoparticle Characterization Techniques in Material Sciences

Nanoparticle characterisation underpins advances across catalysis, electronics, biomedicine and environmental science by revealing size, shape, surface chemistry, structure and composition at the nanoscale. Techniques span from high-resolution imaging methods such as transmission electron microscopy and atomic force microscopy, to ensemble and single-particle light-scattering approaches including dynamic light scattering and nanoparticle tracking analysis. Spectroscopic and diffraction methods (for example, X-ray diffraction, Fourier transform infrared spectroscopy and UV-visible absorption) provide insight into crystal phases, chemical bonds and optical properties, while fractionation techniques such as field-flow fractionation coupled with multi-angle light scattering afford detailed size distributions. Each method possesses strengths and limitations—detection limits, sensitivity to polydispersity, sample preparation artefacts and environmental compatibility vary substantially. As nanoparticle systems grow more complex, combinatorial characterisation strategies are increasingly adopted to ensure reproducibility and metrological rigour. Standardised protocols and reference materials bolster comparability between laboratories and support regulatory compliance. Emerging approaches, notably interferometric tracking and in situ liquid-cell imaging, extend capabilities to quantify concentration, refractive index and colloidal state in real time, even in biological or multiphase environments. The confluence of innovative instrumentation, advanced data analysis and cross-disciplinary collaboration continues to drive a deeper understanding of nanomaterial performance and safety, guiding the design of next-generation functional materials.

Research from Nature Portfolio

Recent studies have addressed preparation-induced artefacts in electron microscopy by introducing macromolecular additives that preserve the native colloidal state during drying. This protocol prevents aggregation and shape distortion, enabling automated, quantitative image analysis for highly polydisperse and anisotropic populations. The approach enhances accuracy in size and dimensionality classification, aligning nanoparticle measurement with regulatory standards and facilitating reproducible interlaboratory comparisons.

Research from all publishers

Advances in interferometric nanoparticle tracking analysis now allow simultaneous measurement of particle size, refractive index and subpopulation concentrations without external calibration. By counting trajectories crossing a focal plane, the technique quantifies concentration in polydisperse suspensions, demonstrating compatibility with biological samples and viral preparations.

A comprehensive review has systematically classified a wide array of characterisation techniques by principle—optical, scattering, microscopy, spectroscopy and diffraction—detailing their operational mechanisms, advantages, limitations and suitable applications. Emphasis is placed on combinatorial workflows to overcome single-method shortcomings and to ensure reproducible, reliable data across diverse nanomaterials.

A recent perspective on light-scattering technologies evaluates dynamic light scattering and nanoparticle tracking analysis in liquid suspensions, analysing factors that influence measurement uncertainty. It also surveys complementary non-light-scattering methods and provides guidance for selecting the most appropriate technique to meet accuracy demands and regulatory requirements.

Nanoparticle Characterization Techniques in Material Sciences publication trend

The graph below shows the total number of articles in nanoparticle characterization techniques in material sciences across all publications each year (not limited to Nature Index journals).

Technical terms

Dynamic light scattering (DLS): technique measuring fluctuations in scattered light intensity to derive hydrodynamic size distributions of particles in suspension.

Nanoparticle tracking analysis (NTA): optical method that follows individual Brownian motion trajectories to determine particle size and concentration.

Interferometric nanoparticle tracking analysis (iNTA): enhanced NTA variant employing interferometry to measure particle size, refractive index and subpopulation concentrations without calibration.

Transmission electron microscopy (TEM): imaging method transmitting electrons through specimens to resolve morphology and structure at nanometre scale.

Zeta potential: electrokinetic potential at the slipping plane of dispersed particles, indicative of surface charge and colloidal stability.

References

1. Measuring Concentration of Nanoparticles in Polydisperse Mixtures Using Interferometric Nanoparticle Tracking Analysis. ACS Nano (2024).
2. Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties. Nanoscale (2018).
3. Characterisation of particles in solution – a perspective on light scattering and comparative technologies. Science and Technology of Advanced Materials (2018).
4. Avoiding drying-artifacts in transmission electron microscopy: Characterizing the size and colloidal state of nanoparticles. Scientific Reports (2015).