SCM Nano Diamond

About SCM Nano Diamonds

Dia Material develops diamond particles with an average particle size of less than 100 nm (0.1 µ) as ultrafine (nano) diamonds.
As a domestic manufacturer, we pursue a stable supply of nanodiamonds while actively conducting joint research with various industries to develop new applications.

Diamond Properties

Hardness, low friction, high thermal conductivity, low thermal expansion, wide gap, stability, surface properties, etc.

Application development

Ultra-precision polishing, solid-state sliding, plating, heat sinks, CVD seed crystals, electron emission, UV blocking, catalysis, adsorption, medical, etc.

Physical properties of nanodiamonds

Polycrystalline type

100nm, FE-SEM x100,000 times

100nm, TEM x80,000 times

Manufacture

Synthesised from graphite by impact energy produced in an explosion (impact compression method, 40 GPa, 3000 °C x instant)

Production

USA, Japan (our company), China, etc.

Production

Sintered primary particles (5-20 nm)
Secondary particles can be classified in 50 nm intervals

Crystallinity

Cubic & hexagonal

Shape

Rounded corners, irregularly shaped

Specific surface area

>120m2/g(100nm)

Other

No cleavage,
Residual impurities inside the sintered body (<1%)

Monocrystalline type

100nm, FE-SEM x100,000 times

100nm, TEM x80,000 times

Manufacture

Synthesised from graphite using high-pressure, high-temperature equipment
(Static pressure method, 50,000 atmospheres, 1,200°C x approx. 10 min)

Production

All over the world

Particle size

Exists as single particles

Crystallinity

Cubic

Shape

Angular, irregular, many types

Specific Surface Area

330-40m2/g (100nm)

Other

Cleavage, low impurity content

X-ray diffraction chart of nanodiamonds

Various diamonds (grain size 100 nm) Powder X-ray diffraction results

Polycrystalline	Monocrystalline	UDD type
CUB/HEX	CUB	CUB
FWHM1.2-1.8	FWHM0.4-0.6	FWHM1.7-2.2
Particle size 10-20nm	-	Particle size 3-8nm

Polycrystalline

Monocrystalline

Examples of Raman spectroscopy
measurements of nanodiamonds

Crystallinity (1330 cm-1): single crystal ＞ UDD type ＞ polycrystalline

In cluster diamonds, a non-diamond carbon peak (sp2 carbon) is often identified around 1580 cm-1.

Polycrystalline type

Monocrystalline type

Handling of
nanodiamonds: classification

Polycrystalline type

100nm d50=0.0991μ, mv=0.1065μ, s.d. 0.0385

80nm d50=0.0828μ, mv=0.0874μ, s.d. 0.0338

50nm d50=0.0505μ, mv=0.0562μ, s.d. 0.023

Products for conventional applications are available in the abrasives market.
Samples are available for other applications and for sub 50nm applications.

Tested by MicrotracUPA

Monocrystalline type

100nm d50=0.1028μ, mv=0.1041μ, s.d. 0.0344

80nm d50=0.0815μ, mv=0.0852μ, s.d. 0.0244

50nm d50=0.0536μ, mv=0.0589μ, s.d. 0.0246

Products for conventional applications are available in the abrasives market.
Samples are available for other applications and for sub 50nm applications.

Tested by MicrotracUPA