ISO/TS 21356-1:2021 ナノテクノロジー—グラフェンの構造特性—パート1：粉末および分散液からのグラフェン | ページ 6

3.1

graphene

graphene layer

single-layer graphene

monolayer graphene

single layer of carbon atoms with each atom bound to three neighbours in a honeycomb structure

Note 1 to entry: It is an important building block of many carbon nano-objects.

Note 2 to entry: As graphene is a single layer, it is also sometimes called monolayer graphene or single-layer graphene and abbreviated as 1LG to distinguish it from bilayer graphene (2LG) (3.3) and few-layer graphene (FLG) (3.4).

Note 3 to entry: Graphene has edges and can have defects and grain boundaries where the bonding is disrupted.

[SOURCE:ISO/TS 80004‑13:2017, 3.1.2.1]

3.2

graphite

allotropic form of the element carbon, consisting of graphene layers (3.1) stacked parallel to each other in a three-dimensional, crystalline, long-range order

Note 1 to entry: Adapted from the definition in the IUPAC Compendium of Chemical Terminology.

Note 2 to entry: There are two primary allotropic forms with different stacking arrangements: hexagonal and rhombohedral.

[SOURCE:ISO/TS 80004‑13:2017, 3.1.2.2]

3.3

bilayer graphene

2LG

two-dimensional material consisting of two well-defined stacked graphene layers (3.1)

Note 1 to entry: If the stacking registry is known, it can be specified separately, for example, as “Bernal stacked bilayer graphene”.

[SOURCE:ISO/TS 80004‑13:2017, 3.1.2.6]

3.4

few-layer graphene

FLG

two-dimensional material consisting of three to ten well-defined stacked graphene layers (3.1)

[SOURCE:ISO/TS 80004‑13:2017, 3.1.2.10]

3.5

graphene nanoplate

graphene nanoplatelet

GNP

nanoplate consisting of graphene layers (3.1)

Note 1 to entry: GNPs typically have thickness of between 1 nm to 3 nm and lateral dimensions ranging from approximately 100 nm to 100 μm.

[SOURCE:ISO/TS 80004‑13:2017, 3.1.2.11]

3.6

lateral size

flake size

<2D material> lateral dimensions of a 2D material flake

Note 1 to entry: If the flake is approximately circular then this is typically measured using an equivalent circular diameter or if not via x, y measurements along and perpendicular to the longest side.

[SOURCE:ISO/TS 80004‑13:2017, 3.4.1.15]

3.7

graphene oxide

GO

chemically modified graphene (3.1) prepared by oxidation and exfoliation of graphite (3.2) , causing extensive oxidative modification of the basal plane

Note 1 to entry: Graphene oxide is a single-layer material with a high oxygen content, typically characterized by C/O atomic ratios of approximately 2,0 depending on the method of synthesis.

[SOURCE:ISO/TS 80004‑13:2017, 3.1.2.13]

3.8

reduced graphene oxide

rGO

reduced oxygen content form of graphene oxide (3.7)

Note 1 to entry: This can be produced by chemical, thermal, microwave, photo-chemical, photo-thermal or microbial/bacterial methods or by exfoliating reduced graphite oxide.

Note 2 to entry: If graphene oxide was fully reduced, then graphene (3.1) would be the product. However, in practice, some oxygen containing functional groups will remain and not all sp³ bonds will return back to sp² configuration. Different reducing agents will lead to different carbon to oxygen ratios and different chemical compositions in reduced graphene oxide.

Note 3 to entry: It can take the form of several morphological variations such as platelets and worm-like structures.

[SOURCE:ISO/TS 80004‑13:2017, 3.1.2.14]