The world's first international standard for graph

2022-09-23
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The world's first international standard for graphene has been issued

according to npl (National Physical Laboratory of the UK), the world's first ISO graphene standard has been published. The standard was developed by the National Physical Laboratory (NPL) in the UK, which defines the terms used to describe many different forms of graphene and related 2D materials, and provides a basis and standard for the testing and verification of graphene. This standard will provide a consistent standard for the graphene industry and accelerate the commercial development of two-dimensional materials represented by graphene

the world's first ISO (International Organization for Standardization) graphene standard has been published. This standard will provide a consistent standard for the emerging global graphene industry and accelerate the commercial development of two-dimensional materials represented by graphene

the new international standard developed by the National Physical Laboratory (NPL) of the United Kingdom, and the door panel standard of the new project is changed from 52388f standard to tl52388h standard, which defines the terms used to describe many different forms of graphene and related 2D materials, and provides the basis and standard for the testing and verification of graphene. This will provide a clear basis for graphene related manufacturers, suppliers, non-governmental organizations, industrial alliances and academia, help unlock new applications of graphene, reduce manufacturing costs, and promote the development of industrial scale graphene materials for the next generation of computer chips and clothing smart sensors

due to the excellent properties and broad market prospects of graphene, the enthusiasm of academia and industry for graphene has been increasing. Hundreds of companies around the world have participated in the preparation or application of graphene, and graphene is forming a huge industry. However, although terms such as "epitaxial graphene", "graphene oxide" and "low-layer graphene" were widely used in the whole industry, there was no generally agreed definition of these terms before the publication of this new standard. Even in some cases, hundreds of layers of graphene are incorrectly labeled as "few layers of graphene". This will lead to companies that are developing new products that cannot fully understand the performance of commercially available graphene materials and choose the most suitable materials for their applications. The lack of standards is a key barrier to the commercialization of graphene products, affecting people's trust in graphene suppliers

recognizing the clear needs of the graphene industry, NPL, as part of the British nanotechnology Standardization Committee (NTI/1) of the British Standards Institute (BSI), launched the formulation of the graphene ISO standard in 2013. After a rigorous development process, involving 37 technical experts from different countries, the standard is now available, including 99 terms and definitions about 2D materials, material production, material properties and material attribute types, all of which can be obtained free of charge on the ISO browsing platform

Dr. poll Pollard of NPL and Dr. Charles Clifford jointly led the development of this standard, He commented: "graphene producers and end users have been worried for many years that inconsistent definitions and terms mean that the commercialization of these materials is slow and it is difficult to determine the differences between graphene and graphite products. This standard solves this obstacle and is the first step towards standardization in this emerging industry.

Standard Name:

iso/ts: 2017 (EN):

graphene and related two-dimensional (2D) materials

graphene and related two-dimensional materials

some terms related to graphene in the standard:

graphene:

graphene layer:

single-layer graphene:

definition: single-layer carbon atoms, each atom is combined with three adjacent carbon atoms in a honeycomb structure. (single layer of carbon atoms with each atom bound to three neighbours in a honeycomb structure)。

note 1: This is an important part of many carbon nano materials

note 2: because graphene is single-layer, it is sometimes called single-layer graphene, which is called 1lg for short, to distinguish it from double-layer graphene (2lg) and layered graphene (Flg)

build a humanized chemical plant with high efficiency, energy conservation, green environmental protection and comfortable environment

note 3: graphene has edges, and may have defects and grain boundaries where the bonds are damaged

double layer graphene:

a two-dimensional material composed of two clearly defined graphene layers

note 1: if the stacking method is known, it can be specified separately, such as "Bernal stacking double-layer graphene"

twisted double-layer graphene:

vortex double-layer graphene:

tblg

t2lg

a two-dimensional material composed of two well-defined graphene layers, which has a relative stacking angle, or relative rotation, and is not Bernal (hexagonal) or rhombic stacking

three-layer graphene:

a two-dimensional material composed of three clearly defined laminated graphene layers

note 1: if the stacking method is known, it can be specified separately, such as "twisted three-layer graphene"

few layer graphene:

two dimensional material composed of three to ten clearly defined laminated graphene layers

graphene nano sheet (plate):

nano sheet (sheet) composed of graphene layers

note 1: GNP usually has a thickness of 1nm to 3nm and about 100nm to 100 μ M

graphene oxide:

chemically modified graphene prepared by graphite oxidation and stripping

note 1: graphene oxide is a monolayer material with high oxygen content, which is typically characterized by a C/O atomic ratio of about 2.0, depending on the synthesis method

reduced graphene oxide:

reduced graphene oxide, reduced oxygen content

note 1: it can be prepared by reducing the 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 be retained, and not all SP3 bonds will return to the SP2 configuration. Different reductants will lead to different C/O ratios and different chemical compositions in the reduced graphene oxide

note 3: it can have different shapes, such as lamellar and vermicular structures

about ISO standards:

iso standards refer to the standards formulated by the 'International Organization for Standardization (ISO)'. The international organization for Standardization (ISO) is a worldwide federation of national standardization bodies with 140 member countries. According to the constitution of the organization, each country can only have one of the most representative standard Jinan experimental machine factory universal experimental machine function comprehensive standardization group as its members, and the former State Administration of quality and technical supervision participated in ISO activities in the name of CSBTS

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