HC Plastics News: According to NPL (National Physics Laboratory) official website news, the world's first ISO graphene standard has been published. Developed by the National Physical Laboratory (NPL), the standard defines terms used to describe many different forms of graphene and related 2D materials, providing the basis and criteria for testing and verification of graphene. This standard will provide a consistent standard for the graphene industry and accelerate the commercial development of 2D materials represented by graphene.
The world's first ISO (International Organization for Standardization) graphene standard has been published. The standard will provide a consistent standard for the emerging global graphene industry and accelerate the commercial development of 2D materials represented by graphene.
A new international standard developed by the National Physical Laboratory (NPL) of the United Kingdom defines terms used to describe many different forms of graphene and related 2D materials, providing a basis and standard for testing and verification of graphene. This will provide a clear basis for graphene-related manufacturers, suppliers, NGOs, industry alliances and academia to help unlock new applications for graphene, reduce manufacturing costs, and drive the development of next-generation computer chips. Industrial scale graphene materials for garment smart sensors.
Due to the excellent properties and broad market prospects of graphene, the enthusiasm for graphene in academic and industrial circles has been increasing. There are hundreds of companies around the world involved in the preparation or application of graphene. Graphene is forming a huge industry. . However, although terms such as "epitaxial graphene", "graphene oxide" and "small layer graphene" have been widely used throughout the industry, these terms are not generally accepted until the publication of this new standard. definition. Even in some cases, hundreds of layers of graphene are incorrectly labeled as "small layer graphene." This can result in companies that are developing new products that do not fully understand the performance of commercially available graphene materials and select the materials that best suit their application. The absence of standards is a key barrier to the commercialization of graphene products, affecting the trust of graphene suppliers.
Recognizing the clear need of the graphene industry, NPL initiated the development of the graphene ISO standard in 2013 as part of the British Standards Institute (BSI) UK Nanotechnology Standardization Committee (NTI/1). After a rigorous development process involving 37 technical experts from different countries, the standard is now available online and contains 99 terms and definitions for 2D materials, material production, material properties and material property types, all of which can be Obtained free of charge in the ISO online browsing platform.
Dr. PollPollard of NPL and Dr. Charles Clifford jointly led the development of the standard. He commented: “Graphite producers and end users have been worried for years. Inconsistent definitions and terminology mean that the commercialization of these materials is slow and difficult to determine graphite. The difference between olefin and graphite products. This standard solves this obstacle and is the first step towards standardization in the emerging industry of graphene.
standard name:
ISO/TS80004-13:2017(en):
Grapheneandrelatedtwo-dimensional(2D)materials
Graphene and related two-dimensional materials
Some of the terms related to graphene in the standard:
Graphene:
Graphene layer:
Single layer graphene:
Definition: A single layer of carbon atoms, each atom bonded to an adjacent three carbon atoms in a honeycomb structure. (singlelayerofcarbonatomswitheachatomboundtothreeneighboursinahoneycombstructure).
Note 1: This is an important part of many carbon nanomaterials.
Note 2: Since graphene is a single layer, it is sometimes called single-layer graphene, abbreviated as 1LG, to distinguish it from double-layer graphene (2LG) and layered graphene (FLG).
Note 3: Graphene has edges and may have defects and grain boundaries where the bond is broken.
Double layer graphene:
2LG
A two-dimensional material consisting of two layers of graphene layers that have been clearly defined.
Note 1: If the stacking method is known, it can be specified separately, for example “Bernal stacked double-layer grapheneâ€.
Twisted bilayer graphene:
Eddy bilayer graphene:
tBLG
t2LG
A two-dimensional material consisting of two well-defined graphene layers with relative stacking angles, or relative rotations, non-Bernal or hexagonal stacks.
Three layers of graphene:
3LG
A two-dimensional material consisting of three well-defined stacked graphene layers.
Note 1: If the stacking method is known, it can be specified separately, such as “twisted three-layer grapheneâ€.
Less layer of graphene:
FLG
A two-dimensional material consisting of three to ten well-defined stacked graphene layers
Graphene nanosheets (plates):
GNP
Nanoplate (sheet) composed of graphene layer
Note 1: GNP typically has a thickness of 1 nm to 3 nm and a lateral dimension of about 100 nm to 100 μm.
Graphene oxide:
GO
Chemically modified graphene prepared by graphite oxidation and stripping.
Note 1: Graphene oxide is a single-layer material with a high oxygen content, which is typically characterized by a C/O atomic ratio of about 2.0, depending on the synthesis method.
Reduction of graphene oxide:
RGO
Reduced treatment of graphene oxide to reduce oxygen content
Note 1: It can be prepared by reducing the heavy oxygen content of graphene oxide by chemical, thermal, microwave, photochemical, photothermal or microbial/bacterial methods.
Note 2: If graphene oxide is completely reduced, it becomes a graphene product. However, in practice, some oxygen-containing functional groups will remain and not all sp3 bonds will return to the sp2 configuration. Different reducing agents will result in different carbon to oxygen ratios and different chemical compositions in the reduced graphene oxide.
Note 3: There may be different forms, such as sheet and worm-like structures.
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