Gemini™ 750NM


Re-dispersing Surfactants

The unique surfactant technology that underpins the production of the SONA gold nanorods (GNR’s) has some significant advantages over GNR’s prepared using the cetyltrimethylammonium bromide, or CTAB synthesis method. SONA’S surfactant technologies lead to remarkably stable gold nanorods; however, in some cases, when your GNR sample is subjected to temperatures well below room temperature for extended periods of time (as would be typical of their recommended storage conditions), precipitated surfactant will be visible in the solution. This does not impact the amount of GNR’s suspended in solution, nor is it a sign of an irreversible aggregation process by which GNR’s are destroyed, as is often the case with other CTAB prepared GNR’s. To homogenize the solutions, the following procedure is recommended – place the GNR containing vial in a warm water bath (30-35°C) for approximately 15 minutes. Remove the vial from the bath, gently swirl the solution inside, and visually examine the contents for remaining precipitated surfactant. If precipitated surfactant is still visible, repeat the process until the solution clears.

LSPR – Longitudinal Surface Plasmon Resonance.
TSPR – Transverse Surface Plasmon Resonance.

Product Specs



Nanorod length (nm) 10 – 15
Nanorod width (nm) 25 – 31
Aspect ratio (TEM) 3.4 - 3.7
Optical density (cm-1) 1.0 – 1.2
LSPR Maximum (nm) 740 – 760
LSPR/TSPR Ratio > 1.75
Zeta Potential (mV) 30 – 40
pH 5.5 – 7.5
Colour Garnet
Particle Concentration > 30 μg /mL
Solvent Stabilized with amphiphilic agents in conductivity grade water (18.0 MΩ cm–1)