Synthesis and Characterization of Noble Metal Nanostructures

Recent decades have seen the emergence of noble metal nanostructures as pivotal materials owing to their unique optical, catalytic and biomedical properties arising from size- and shape-dependent plasmonic resonances. Synthesis methodologies span chemical wet routes—such as citrate reduction and polyol processes—physical approaches like vapour deposition, and advanced continuous-flow or microfluidic reactors. Control over nucleation and growth is achieved by tuning reagent concentrations, temperature, pH and choice of capping ligands. Autonomous experimentation platforms now integrate Bayesian optimisation with real-time UV–visible spectroscopy to navigate complex synthetic parameter spaces efficiently. Characterisation techniques include transmission electron microscopy for morphology, dynamic light scattering for hydrodynamic size, UV–visible spectroscopy to probe localised surface plasmon resonance, X-ray diffraction for crystallinity and surface-sensitive methods like Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy for ligand binding. Computational frameworks combining population balance modelling with computational fluid dynamics provide predictive insights into mixing-induced effects on particle size distributions. Tailored noble metal nanostructures are central to global applications in catalysis, sensing, biomedicine, photonics and energy harvesting. Continued advances in surface functionalisation and stabilisation have enhanced biocompatibility and facilitated scalable manufacturing, underscoring the broad significance of robust synthetic and analytical protocols.

Research from Nature Portfolio

Recent studies have leveraged ligand topology to enhance nanoparticle stability. One work demonstrated that cyclic poly(ethylene glycol) physisorbs onto gold nanoparticle surfaces with greater affinity than linear or thiolated analogues, maintaining colloidal dispersibility through freeze–thaw cycles, lyophilisation and heating. This strategy yielded nanoparticles with prolonged blood circulation and improved tumour accumulation in vivo, illustrating how polymeric architecture can modulate both physicochemical stability and biological performance.

Synthesis and Characterization of Noble Metal Nanostructures publication trend

The graph below shows the total number of articles in synthesis and characterization of noble metal nanostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Noble metal nanostructures: Nano-scale materials composed of metals such as gold, silver, platinum or palladium, exhibiting unique electronic and optical properties.

Localised surface plasmon resonance (LSPR): Collective oscillation of conduction electrons at the surface of metal nanoparticles when excited by light, producing characteristic absorption and scattering peaks.

Physisorption: Reversible adsorption of molecules onto a surface via weak van der Waals forces, often employed for non-covalent ligand binding.

Population balance modelling (PBM): Mathematical framework describing the distribution and evolution of particle populations based on nucleation, growth, aggregation and breakage kinetics.

Microfluidic reactor: Device with microscale channels enabling precise control of fluid flow, heat and mass transfer for continuous nanoparticle synthesis.

References

1. Bespoke Metal Nanoparticle Synthesis at Room Temperature and Discovery of Chemical Knowledge on Nanoparticle Growth via Autonomous Experimentations. Advanced Functional Materials (2024).
2. Silver nanoparticles synthesis in microfluidic and well-mixed reactors: A combined experimental and PBM-CFD study. Chemical Engineering Journal (2023).
3. Enhanced dispersion stability of gold nanoparticles by the physisorption of cyclic poly(ethylene glycol). Nature Communications (2020).