GR3372 Highly Oriented Pyrolytic Graphite (HOPG)

Catalog No.	GR3372
Compositions	C
Density	2.255 - 2.265 g/cm3
Grade	ZYA, ZYB, ZYD, ZYH
Minimum Size [mm]	12x12
Nominal Thickness [mm]	2, 4, 6, 8

Highly Oriented Pyrolytic Graphite (HOPG) is the material produced by the application of uniaxial pressure on deposited pyrocarbon at very high temperatures. Stanford Advanced Materials (SAM) has rich experience in manufacturing and supplying high-quality Optical Products.

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Description

Specification

Highly Oriented Pyrolytic Graphite (HOPG) Description

HOPG - Highly Oriented Pyrolytic Graphite is the material produced by the application of uniaxial pressure on deposited pyrocarbon at very high temperatures (sometimes more than 3000℃). Depending on deformation, temperature, and annealing time one can get material with different mosaic spreads, amounts of defects, and granular structures (average size of the grains and crystallites). The most suitable HOPG for STM/AFM applications should have large grains and crystallites, a uniform surface with minimal steps (parts of broken carbon planes), and should allow easily cleaving of very thin layers, such that the surface of the sample can be refreshed many times for investigations.

Highly Oriented Pyrolytic Graphite (HOPG) Specifications

Physical Properties
Spacing of Reflecting Planes (002):	3.355 - 3.359 Å
Density:	2.255 - 2.265 gem-3
Thermal Conductivity	16 - 20 Watt/cm K
Parallell (002):	ca. 0.8 Watt/cm K
Perpendicular (002):
Thermal Expansion	Slightly negative
Parallell (002):	20 x 10-6 / K
Perpendicular (002):
Electrical Resistivity	3.5 - 4.5 x 10-5Ohm cm
Parallell (002):	0.15 - 0.25 Ohm cm
Perpendicular (002):

Mosaic spread is the half maximum height peak width of the Cu-Ka

Grade	Mosaic Spread	Nominal thickness [mm]**	*Minimum size [mm]**	*Maximum size [mm]**
ZYA	0.4° ± 0.1°	2	12 x 12	50 x 50
ZYB	0.8° ± 0.2°	2	12 x 12	50 x 75
ZYD	1.2° ± 0.2°	2, 4	12 x 12	50 x 75
ZYH	3.5° ± 1.5°	2, 4, 6, 8	12 x 12	75 x 75
* other sizes or specific mosaic spread on request
** Tolerance ± 0/-1 mm
Standard radii for singly-bent plates: 115, 225, 250, 510, 790, and 1.300 mm.

Standard size for bent monochromators (mm):
12 x 12, 20, 25, 40	20 x 20, 25, 40, 50
15 x 15, 25, 40, 50	25 x 25, 40, 50, 75
Thickness for bent plates 2 + 0/-1 mm.

Highly Oriented Pyrolytic Graphite (HOPG) Applications

Scanning Tunneling Microscope-Calibration and Substrate

Graphite Monochromator

X-ray diffraction

Neutron scattering and diffraction

Highly Oriented Pyrolytic Graphite (HOPG) Packaging

Our Highly Oriented Pyrolytic Graphite (HOPG) is carefully handled during storage and transportation to preserve the quality of our product in its original condition.