Gold Nanostars 90 nm, surface: PVP, chitosan, LSPR peak 1000-1050nm, branches 20-40 nm

Overview

NanoBrand Gold Nanostars 90 nm are anisotropic gold nanoparticles with an average 90 nm diameter and branched spikes of about 20–40 nm, engineered for strong plasmonic enhancement in the NIR region. Their LSPR peak is tuned within 1000–1050 nm, making them ideal for SERS, bioimaging and NIR‑excited photothermal Life Science applications. The nanostars are supplied reactant‑free in high‑purity water with PVP or chitosan surface coatings, ensuring colloidal stability and convenient interfaces for further functionalization. 

Key specifications

Average diameter: 90 nm.
Branch length: 20–40 nm (anisotropic spikes).
LSPR peak position: 1000–1050 nm (near‑infrared).
Surface coating options: PVP, chitosan. 

Learn Why did we Chose not to Sell them Bare.

Matrix: reactant‑free Milli‑Q water (18.2 MΩ·cm). 

Find out Why should Stabilizing agents be Avoided.

Each lot is supplied with a Certificate of Analysis including TEM images, UV‑Vis spectra, PdI, hydrodynamic diameter and zeta‑potential.

Consult a typical CoA for Gold Nanostars LSPR 1000-1050, PVP and CoA for Gold Nanostars LSPR 1000-1050, Chitosan.

Controlled Geometry and Reproducible Optics

For each lot, average diameter and branch length are quantified from TEM, and an equivalent spherical diameter is calculated (Dequiv ≈ Dcore + ½ Lbr) to support accurate mass and concentration estimates. This control of nanostar geometry delivers consistent optical properties and reproducible LSPR peak positions from batch to batch, supporting robust assay development and comparative studies.

Advantages for Life Science Applications

NanoBrand Gold Nanostars are supplied as reactant‑free dispersions in water, avoiding stabilizers that may interfere with bioconjugation, SERS readout or imaging contrast. Narrow size and morphology distribution, lot‑to‑lot reproducibility and Green‑chemistry‑inspired synthesis make these nanostars well suited for diagnostics, biosensing, lateral flow assays and other biomedical applications. See Biocompatible Nano-Gold for application details.

Custom LSPR Peak and Morphology

By tuning nanostar geometry, we can position the LSPR peak anywhere between 600–1100 nm to match common laser lines and imaging windows. On request, we supply nanostars with customized morphology, LSPR peak, concentration and surface coating for specific assay, imaging, photothermal or theranostic protocols. To learn more, discover What are Gold Nanostars “hot spots” and why do they matter.

CTAB‑free, Reactant‑free Dispersion

Our nanostars are formulated as reactant‑free dispersions in Milli‑Q water (18.2 MΩ·cm) with long‑term stability, without added CTAB, CTAC, Tweens, PBS or proprietary stabilizers that can interfere with biology or assay readouts. In contrast, many alternative products are supplied in surfactant‑rich buffers that complicate conjugation or increase background. Find out Why should Stabilizing agents be Avoided.

Reproducibility and Eco‑friendly Synthesis

Precise lot‑to‑lot reproducibility of nanoparticle size, LSPR peak, surface charge and concentration is essential for regulated biomedical, diagnostic and pharmaceutical workflows. Stable nanostars lots reduce batch‑to‑batch variability in lateral flow assays, biosensors and imaging agents. NanoBrand gold nanostars are produced using Green Chemistry‑inspired synthesis that minimizes harsh reagents and reduces environmental impact, supporting laboratories that prioritize sustainable nanomaterials.

NanoBrand Gold Nanostars (sharp, anisotropic spikes on a central core) are distinct from gold nanourchins, which have a rounded, raspberry‑like morphology. Nanostars are preferred when narrow, tunable NIR resonances and intense tip hot spots are required, while nanourchins suit broadband, rough‑surface SERS and large‑area substrates. For more details, read What to Choose: Gold Nanostars or Gold Nanourchins.

Storage, Stability and Related Products

Store gold nanostars at 4–25 °C, protected from light, and DO NOT FREEZE. Gently mix before use; storage toward the lower end of the range generally improves shelf life. During storage, the LSPR peak may shift slightly within the specified window (for example, 900–950 nm), usually toward shorter wavelengths; for longer storage, measuring the UV–Vis spectrum before critical experiments is recommended.

NanoBrand does not guarantee suitability for any particular application; customers must confirm that the product is appropriate and permitted for the intended use. Please consult our Terms of Service and follow institutional safety guidelines when handling nanomaterials. Customized morphologies, LSPR peak positions, concentrations and surface coatings (including alternative polymers or biofunctional shells) are available on request.

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