Microfluidic Synthesis of Metal Nanoparticles

Microfluidic synthesis of metal nanoparticles harnesses the precise manipulation of fluids in channels with dimensions of tens to hundreds of micrometres to direct nucleation and growth under highly controlled conditions. Compared with conventional batch reactors, microfluidic platforms offer enhanced mass and heat transfer, uniform reagent mixing and reproducible residence times, yielding nanoparticles with narrow size distributions and tailored shapes. Two principal architectures prevail: continuous‐flow reactors, in which reagents are introduced into fixed microchannels to achieve steady‐state production, and droplet microreactors, which compartmentalise nano-synthesis in discrete droplets to eliminate axial dispersion and cross-contamination. Key advantages include rapid screening of reaction parameters, facile scale-out via numbering-up strategies and integration of in situ analysis for real-time process control. These systems have accelerated the development of plasmonic, catalytic and biocompatible metal nanoparticles for applications ranging from surface-enhanced spectroscopy and targeted drug delivery to heterogeneous catalysis and environmental sensing. By coupling microfabrication with automation and advanced sensor technologies, the field is moving towards standardised, on-demand production of high-quality nanomaterials with minimal reagent consumption and waste generation.

Research from Nature Portfolio

Recent studies have demonstrated the continuous synthesis of monodisperse branched gold nanoparticles within droplet reactors, where epitaxial growth inside microdroplets enabled automated control over branch number and size, achieving anisotropic structures with reproducibility comparable to bulk methods. Another development introduced an open-access, low-cost flow system capable of producing litre-scale gold and silver nanoparticle dispersions with consistent size distributions, stabilising flow conditions and reagent delivery to suppress fouling and ensure high colloidal quality. These innovations highlight scalable routes to plasmonic nanomaterials with tightly controlled optical properties and batch-to-batch consistency.

Microfluidic Synthesis of Metal Nanoparticles publication trend

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

Technical terms

Microfluidics: The science and technology of manipulating small volumes of fluids within networks of micro-scale channels to control chemical reactions and processes.

Laminar flow: A flow regime characterised by smooth, parallel streamlines and minimal mixing by turbulence, common in micro-scale channels.

Droplet microreactor: A microfluidic device that generates discrete fluid droplets as individual reaction vessels to confine reagents and isolate nanoparticle formation events.

Nucleation: The initial stage of nanoparticle formation in which a critical cluster of atoms or ions aggregates to form a stable seed for subsequent growth.

Residence time: The duration a reagent spends within the microreactor, influencing the extent of nucleation and growth and thus particle size.

Monodispersity: A measure of uniformity in nanoparticle size distribution, indicating high reproducibility and narrow size variation.

References

1. Droplet microfluidics for the highly controlled synthesis of branched gold nanoparticles. Scientific Reports (2018).
2. A low cost and open access system for rapid synthesis of large volumes of gold and silver nanoparticles. Scientific Reports (2021).
3. Continuous Electroformation of Gold Nanoparticles in Nanoliter Droplet Reactors. Angewandte Chemie International Edition (2022).
4. Dial‐A‐Particle: Precise Manufacturing of Plasmonic Nanoparticles Based on Early Growth Information—Redefining Automation for Slow Material Synthesis. Advanced Energy Materials (2021).
5. Nanomaterials as a Service (NaaS) concept: on-demand protocols for volume synthesis of nanomaterials. Nanoscale Horizons (2024).