Nanopartz Gold Nanowires

Nanopartz™ has developed the industry standard in Gold Nanowires. These nanowires are 75 to 150nm in diameter, and range from 1 µm to 40 microns in length.  In the bare form, these nanowires are immersed in DI water with excess CTAB capping agent to minimize aggregation. As with all of Nanopartz products, they are highly monodisperse.


Part #  Diameter (nm) Length (nm) Aspect Ratio Peak SPR Wave (nm) Nanowires Vol (nm3) Nanowires /mL Wt. conc (ug/ml) Wt. % PPM Molarity (pM) SPR Molar Ext. (M-1cm-1)
A14-1000 75 1000 13 510 4.31E+06 6.02E+08 50 0.01% 50 1 4.98E+07
A14-2000 75 2000 27 510 8.72E+06 2.97E+08 50 0.01% 50 0.5 1.01E+08
A14-3000 75 3000 40 510 1.31E+07 1.97E+08 50 0.01% 50 0.33 1.52E+08
A14-4000 75 4000 53 510 1.76E+07 1.48E+08 50 0.01% 50 0.25 2.03E+08
A14-6000 75 6000 80 510 2.64E+07 9.83E+07 50 0.01% 50 0.16 3.05E+08
A14-7500 75 7500 100 510 3.30E+07 7.86E+07 50 0.01% 50 0.13 3.82E+08
A14-10000 75 10000 133 510 4.40E+07 5.89E+07 50 0.01% 50 0.1 5.10E+08
A14-40000 150 40000 267 510 7.06E+08 3.68E+06 50 0.01% 50 0.01 8.16E+09


Bare Gold Nanowires
Bare Gold Nanowires
Example part number for a 10000nm long nanowire, citrate capping agent, in water, at 25mL, with sterilization certificate, no endotoxin purification would be: A14-10000-CIT-DIH-1-25-CS
CTAB (Cetyltrimethylammonium bromide)
CIT (Citrate)
PEI (100K Polyethylenimine)
PAH (25K Polyallylamine hydrochloride)
PAA (10K Polyacrylic acid)
PVP (40K Polyvinylpyrrolidone)
BSA (Bovine Serum Albumin)
DIH (18MEG DD DI Water)
PBS (Phosphate Buffer Saline pH=7)
MES (pH=4.7)
SOBO (Sodium Borate pH=8.5)
TRIS (pH=7.2)
OD = Optical Density, 1 OD = 0.05mg/mL Au


Part #  Diameter (nm) Length (nm) Aspect Ratio Peak SPR Wave (nm) Nanowires Vol (nm3) Nanowires /mL Wt. conc (ug/ml) Wt. % PPM Molarity (pM) SPR Molar Ext. (M-1cm-1)
A14-1000 75 1000 13.3 510 4.31E+06 6.02E+08 35.0 0.0035% 35 0.703 4.98E+07
A14-2000 75 2000 26.7 510 8.72E+06 2.97E+08 35.0 0.0035% 35 0.347 1.01E+08
A14-3000 75 3000 40.0 510 1.31E+07 1.97E+08 35.0 0.0035% 35 0.230 1.52E+08
A14-4000 75 4000 53.3 510 1.76E+07 1.48E+08 35.0 0.0035% 35 0.172 2.03E+08
A14-6000 75 6000 80.0 510 2.64E+07 9.83E+07 35.0 0.0035% 35 0.115 3.05E+08
A14-7500 75 7500 100.0 510 3.30E+07 7.86E+07 35.0 0.0035% 35 0.092 3.82E+08
A14-10000 75 10000 133.3 510 4.40E+07 5.89E+07 35.0 0.0035% 35 0.069 5.10E+08
Diameter Tolerance
Length Tolerance +/-500nm
Shape monodispersity
>95% nanowires
Surface charge (zeta)
Residual Chemicals
Added Diameter


CTAB Structure


Hexadecyltrimethylammonium bromide (CTAB) (C16H33)N(CH3)3Br, cetyltrimethylammonium bromide. As any surfactant, it forms micelles in aqueous solutions. At 303 K (30 °C) it forms micelles with aggregation number 75-120 (depending on method of determination, usually average ~95) and degree of ionization α (fractional charge) 0.2–0.1 (from low to high concentration). The standard constant of Br- counterion binding to the micelle at 303 K (30 °C) is K° ≈ 400.



These Gold Nanowires are shipped in  DI water with excess CTAB capping agent to reduce knotting.

Custom Formulation

Sizes 500nm through 40 microns. Other sizes are special order.  Please contact us.


This product is sold in volumes from 5mL and 2000mL, 0.05mg/mL.


Standard sizes are in stock. Special order sizes are shipped in two weeks or less. All domestic shipments are sent Fed Ex Standard Overnight delivery, international Fed Ex Priority 2 day. No shipments on Fridays except for dried particles. Saturday shipping available for extra charge.

Shelf Life/Storage Temperature

This product is guaranteed for one year and should be stored at room temperature. Care must be taken to only use sterile glassware when working with this product.


This product is known to be cytotoxic. This product has been sterilized and is biological free.


This product is manufactured using our audited ISO 9000 quality control system. Every order comes with a Certificate of Analysis. We use NIST traceable:

UV-VIS (Agilent 8453) for extinction and concentration measurements

NIR (Cary 500) for NIR extinction and concentration measurements

DLS (Malvern Nano ZS) for zeta potential measurement

ICP-MS (Varian 820-MS) for gold mass measurements

TEM (Phillips CM-100 100KV) for sizing

The manufacturing method for these microparticles are based on our proprietary methods. This invention allows for the manufacturing of highly monodisperse gold microparticles.Gold Nanowires are highly advantageous in nanoelectronics, transparent electrodes, and as nanosensors.

All of these "bare" particles are capped with ligands that are easily replaced with thiol and charge chemistries.


  • Highly stable, minimal to no aggregation
  • Available in aspect ratios up to 100
  • Long shelf life times
  • High conductivity, readily transparent
  • Easily conjugated
  • High corrosion resistance
  • Long wire lengths for nanoelectronics, nanoantennas
  • Applications in tribological additives
  • Light conduction for digital computers
  • Thermally conductive
  • Electronically conductive
  • Photonically conductive


I want to use these nanowires in my sensor application - how do I go about doing that?

You are going to want to conjugate this nanowires to a ligand. We highly recommend our conjugating services for this.

What is the SPR for this product?

There is no Surface Plasmon Resonance for this particle as the diameter and length are too large, so these are not recommended for dark field microscopy. However, they are large enough to reflect light and are very advantageous for bright field microscopy.

I want to use this product in polymers for transparent electrodes. Can I use them as is?

Yes. We highly recommend purchasing them without CTAB, rather with citrate or another ligand as the CTAB can interfere with optical and sensor applications.

"We explored several nanoparticle manufacturers because we were unable to reproduce literature results for our application.  One manufacturer recommended Nanopartz because of our desire for a narrow distribution of particle sizes.  Nanopartz technical support helped us work through our application problems and suggested custom polymers that readily worked where others had failed.  This really impressed us.  They always provide quick delivery and helpful advice.  We would highly recommend Nanopartz."                                                                                  

Tony Mega, Revalesio Corporation


Controllable Growth of Gold Nanowires for Photonics Applications

D Ganta, EB Dale… - Nanoscience and …, 2013 -
... As seen in Figure 1, one Fig. 1. Block diagram of the apparatus used for nanowire assembly. ... 2)
or more. Commercially available chemically grown NWs from Nanopartz have ARs from 150
to 200. ... Controllable Growth of Gold Nanowires for Photonics Applications Ganta et al. ...


Damping of the acoustic vibrations of a suspended gold nanowire in air and water environments

TA Major, A Crut, B Gao, SS Lo, N Del Fatti… - Physical Chemistry …, 2013 -
... nanowires used in the transient absorption experiments were obtained from a commercial source
(Nanopartz). ... to the PMMA layer, and the silicon detached from the gold nanowires/PMMA film
by ... The gold nanowire/PMMA film was then transferred to a glass coverslip containing ...


Spatially localized enhancement of evanescent coupling to whispering-gallery modes at 1550 nm due to surface plasmon resonances of Au nanowires

EB Dale, D Ganta, DJ Yu, BN Flanders… - Selected Topics in …, 2011 -
... The initial growth so- lution contained gold nanorods (purchased from Nanopartz) of an ... Fig. 3.
(a) Simple schematic of the setup in which diode-laser light is evanes- cently coupled from a
tapered fiber to the WGMs of a microsphere on which Au nanowires have been ...


Differential interference contrast microscopy imaging of micrometer-long plasmonicnanowires

JW Ha, K Chen, N Fang - Chem. Commun., 2013 -
... Au nanowires used here were purchased from Nanopartz (A14-2000, Loveland, CO). Fig. ... provides
a fundamental understanding of the optical response of Au nanowires for future ... polarization- and
wavelength- sensitive DIC images and intensities of 2 μm-long gold nanowires...


Study of modal properties in gold nanowire with ZnO cladding by using the finite element method

K Namassivayane, H Tanvir, A Quadir… - Applied …, 2011 -
... used, and this can vary from being as small as 25 nm (commercially available from Nanopartz)
to a ... Chiu, HM Chen, RS Liu, and DP Tsai, “Plasmonic optical properties of a single gold
nano-rod ... XAJ Wang and Q. Li, “Size-dependent electronic structures of ZnO nanowires,” Appl. ...


[PDF] Optics and spectroscopy of gold nanowires

P Vasanthakumar - 2014 -
... The macroscopic transmission properties of these samples are discussed. We have
also used the isolated gold nanowires in the SERS experiments. They are chemically
grown commercial nanowires purchased from Nanopartz...



R Fernandes, T James, MC Zuniga, N Li, S Ngan…



Y Krichevets, O Terniak - Journal" Scientific Israel-Technological Advantages, 2011


Modeling the Behavior of Gold Nanoparticles and Semiconductor Nanowires for Utilization in Nanodevice Applications

AW Makepeace - 2013 -
SEMICONDUCTOR ... Polarization index for various round nanowires………….55 45.
Local electric field of a round InP nanowire under 800nm excitation ...


Nanoindentation of gold nanorods with an atomic force microscope

B Reischl, A Kuronen, K Nordlund - Materials Research Express, 2014 -
... The simulated gold nanorods were modelled at scale 1:2 after commercial samples from
Nanopartz (Bare Gold Nanorodz, item nrs. ... the nanorods are still of the same order, which agrees
with the findings of Wu et al, who found that the Youngʼs modulus of gold nanowires of 40 ...