Boron Nitride Nanotubes – BNNT

Multi-Walled Powder

Boron Nitride Nanotubes – BNNT


BNNT presents similar thermal conducting and mechanical properties compared to CNT, while its thermal/chemical stabilities, biocompatibility, electric insulating, and thermal neutron absorbing properties are much higher than those of CNT. Due to these superior properties, BNNT is currently under exploration in many areas of IT, space/nuclear, bio-medical, and energy.

Product Specifications
Attribute Measurement
BNNT Content > 50 % by Mass
Elemental B (free) < 1 %
Residual Content <24% h-BN and BNH derivatives
Tube Length ≤ 200 µm
Average Nanotube diameter 50 – 100 nm
Surface area (BET) > 30 m2/g
Color Gray
Electrical Conductivity Large band gap insulator ~5.5 eV
Optical proprieties Can be made transparent in visible and infrared regions
Thermal Stability Stable in highly oxidizing (or corrosive) environments, e.g. ~900 °C in air.
Neutron absorption 767 barns (boron, ninth highest)
Synthesis Proprietary
Elemental Properties

Physical Properties

PURITY ~80% >90%
BET Surface Area >32.90 m2/g ~50 m2/g
Molecular Cross-Sectional Area 0.1620 nm
Diameter 30-50 nm 30-50nm
Length ~9 ㎛ >10 ㎛
Characteristic CNT BNNT
Electrical properties Metallic or semiconducting Always semiconducting
(>5 eV wide band gap)
Thermal oxidation resistance Stable up to 300-400℃ in air Stable up to 800℃ in air
Thermal neutron absorption (b = 10-24 m2) 0.0035b B ~760b / N ~1.9b
Thermal conductivity 60 ~ 40,000 W/mK ~3,000 W/mK (Cu ~400 W/mK)
Mechanical properties (Young’s modulus) 1.33 TPa 1.18 TPa
Coefficient of Thermal Expansion ~1 x 10-6 ~1 x 10-6
Color black White (grey if impurity exists)
Product Applications

The primary usage for BNNT is to have the material serve as a Thermal Conductor. The thermal conductivity of a material can be multiplied by the incorporation of BNNT within composite materials. Along with this, BNNT-MWs can also provide Electrical Insulation to materials utilized for information technology devices.

Electrical Insulating Thermal Conducting Material for IT Devices

In a Thermal Conductivity Comparison of 50wt% h-BN dispersed epoxy composite and 0.5wt% BNNT/49.5 wt% h-BN dispersed epoxy composite, Thermal conductivity (1.3 W/mK) was be enhanced as much as 3 times (3.4 W/mK) with only 0.5 wt% BNNT-MW (0.5 wt%). Additionally, this material at a BNNT density of 2.0 g/cm3 could provide a thermal conductivity of 10 W/mK. Furthermore, the Electric Breakdown Voltage for these prepared composites was 26.3 kV/mm.

Electric Measurement
I (µA) R (ohm) P (W)
240 290.82 1.68E-05
BNNT Dimension
Diameter (m) Length (m) Area (m2) k(W/mK)
2E-07 9E-06 1.256E-13 585.6


Kilogram and metric ton price quotes available by request. Additional discounts also available for large volume orders.

For further details, reach out to our Sales Manager at or call +1 450.434.6266.

Large volume discounts available for large quantities. Please contact us for more information.