Silver nanoparticles combine strong plasmonic optical properties, high electrical conductivity, and size-dependent surface reactivity. Their properties can be tuned through particle size, shape, surface chemistry, and surrounding environment, making silver nanoparticles useful across sensing, spectroscopy, antimicrobial research, conductive materials, and optical engineering.
Spherical silver nanoparticles typically exhibit a strong localized surface plasmon resonance in the visible spectrum. Changes in particle size, morphology, aggregation state, or local refractive index can substantially alter their absorption and scattering behavior. Learn more about the physical properties and optical properties of silver nanoparticles.
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Explore silver nanospheres, nanocubes, silica-shelled particles, and other silver nanoparticle formats across a range of sizes and surface chemistries.
Silver Nanoparticle Applications
Silver nanoparticle applications take advantage of different combinations of surface reactivity, electrical conductivity, and interaction with light. Selecting the appropriate size, morphology, and surface chemistry depends on which of these properties is most important to the application.
Antimicrobial & Biomedical Research
Silver nanoparticles are widely studied for antimicrobial applications because silver can release biologically active Ag+ ions into the surrounding environment. Particle size, surface chemistry, aggregation state, and environmental conditions can influence dissolution and ion release, making well-characterized materials important for comparative antimicrobial and nanosafety research.
Silver nanoparticle behavior in biological systems also depends on factors such as concentration, exposure conditions, particle surface, and surrounding media. Application-specific safety should therefore be evaluated in the context of the intended use.
Conductive Materials & Electronics
Silver's high electrical conductivity makes silver nanoparticles useful in conductive inks, pastes, adhesives, composites, and printed or flexible electronic systems. Particle size, surface chemistry, dispersion quality, and processing conditions influence particle packing, sintering, and the resulting electrical properties of the finished material.
Silver nanoparticles can also be incorporated into coatings and composite materials when both nanoscale dimensions and electrical functionality are required.
Plasmonics & Optical Engineering
Silver nanoparticles strongly absorb and scatter light through localized surface plasmon resonance (LSPR). Particle size, shape, surrounding refractive index, and interactions between neighboring particles all influence the wavelength and intensity of the optical response.
These properties make silver nanoparticles useful in plasmonic sensing, optical coatings, color engineering, and surface-enhanced spectroscopy. Shapes with sharp features, including silver nanocubes, are particularly interesting for applications that rely on strong localized electromagnetic fields.
Why Choose nanoComposix Silver Nanoparticles?
Extensive Characterization Data
Silver nanoparticle products are supplied with batch-specific characterization data to help researchers understand the material they are using and compare performance over time. Depending on the particle platform, characterization may include transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta potential, UV-Visible spectroscopy, solution pH, and other relevant measurements.
Batch-specific Certificates of Analysis provide representative characterization data for the supplied material rather than relying only on nominal particle specifications.
Transparent Surface Chemistry & Formulation
Surface chemistry and formulation information are provided for nanoComposix silver nanoparticle products so researchers can account for these variables when designing experiments or integrating particles into downstream systems.
Surface options vary by particle platform and may include citrate, polyvinylpyrrolidone (PVP), silica-based coatings, and other chemistries. See the current silver nanoparticle portfolio for available combinations of particle size, morphology, surface chemistry, and formulation.
Flexible Concentration & Formulation Options
Silver nanoparticle concentration and formulation formats vary by particle size, surface chemistry, and intended application. Available formats can include aqueous dispersions, higher-concentration formulations, dried materials, and particles transferred into alternative solvents.
Selected silver nanosphere sizes are available at 1 mg/mL as low-endotoxin formulations that are passed through a 0.22 µm membrane filter in a controlled environment. These formats can be useful for research applications where higher concentration, low endotoxin, or reduced processing volume is important.
Always refer to the individual product page and batch-specific Certificate of Analysis for the formulation supplied with a specific material.
Colloidal Stability & Formulation Flexibility
Nanoparticle aggregation can significantly alter particle size, optical properties, surface accessibility, and downstream performance. nanoComposix silver nanoparticles are produced and processed as discrete particles with controlled size distributions and formulations designed to maintain colloidal stability.
Silver is also sensitive to its surrounding environment. Light, pH, ionic composition, sulfur-containing compounds, and other solution components can affect particle stability or silver dissolution, so appropriate handling and formulation are particularly important.
Learn more about silver nanoparticle physical properties and colloidal stability.
Technical Support & Custom Development
Our nanoparticle scientists can help with particle size, morphology, surface chemistry, formulation, optical properties, characterization, and integration into downstream applications. If an off-the-shelf material does not meet your requirements, custom nanoparticle development can be used to evaluate alternative particle designs and formulations.
Silver Nanoparticle Concentration & Optical Reference Data
The table below shows how particle size affects particle number concentration and optical response at two silver mass concentrations. At a fixed silver mass concentration, larger particles result in fewer particles per mL and a different optical response.
| Size | 0.02 mg/mL | 1 mg/mL | Peak λ |
|---|---|---|---|
| 10 nm | 3.6 × 1012 particles/mL Peak OD: 2.5 | 1.8 × 1014 particles/mL Peak OD: 125 | 395 nm |
| 20 nm | 4.5 × 1011 particles/mL Peak OD: 2.5 | 2.3 × 1013 particles/mL Peak OD: 125 | 400 nm |
| 30 nm | 1.3 × 1011 particles/mL Peak OD: 2.2 | 6.7 × 1012 particles/mL Peak OD: 110 | 400 nm |
| 40 nm | 5.7 × 1010 particles/mL Peak OD: 2.7 | 2.8 × 1012 particles/mL Peak OD: 135 | 410 nm |
| 50 nm | 2.9 × 1010 particles/mL Peak OD: 2.4 | 1.5 × 1012 particles/mL Peak OD: 120 | 420 nm |
| 60 nm | 1.7 × 1010 particles/mL Peak OD: 1.9 | 8.4 × 1011 particles/mL Peak OD: 95 | 435 nm |
| 75 nm | — | 4.7 × 1011 particles/mL Peak OD: 90 | 440 nm |
| 80 nm | 7.1 × 109 particles/mL Peak OD: 1.4 | 3.6 × 1011 particles/mL Peak OD: 70 | 460 nm |
| 100 nm | 3.6 × 109 particles/mL Peak OD: 0.9 | 1.8 × 1011 particles/mL Peak OD: 45 | 500 nm |
Reference concentrations: 0.02 mg/mL silver corresponds to approximately 0.185 mmol/L Ag and 0.002% silver by mass. 1 mg/mL corresponds to approximately 9.27 mmol/L Ag and 0.1% silver by mass.
Values are provided as technical reference data rather than a list of currently stocked product configurations. Actual optical properties depend on particle size distribution, morphology, surface chemistry, surrounding medium, and measurement conditions. Refer to the individual product page and batch-specific Certificate of Analysis for current configurations and measured values.
For more detail on the underlying size-, shape-, and surface-dependent behavior of silver nanoparticles, continue to Silver Nanoparticle Physical Properties and Silver Nanoparticle Optical Properties.
Explore more about silver nanoparticles