Overview
IEC TS 62607-6-14:2020 is a Technical Specification in the IEC “Nanomanufacturing – Key control characteristics” series that defines a standardized Raman spectroscopy method to determine the defect level of graphene-based powders. The defect level is quantified by the intensity ratio ID+D′ / I2D (the combined D and D′ band intensity divided by the 2D band intensity) from a recorded Raman spectrum. The method is intended for graphene in powder form (including reduced graphene oxide (rGO), bilayer, trilayer and few‑layer graphene) and the measured defect level is to be listed as a key control characteristic in the blank detail specification IEC 62565-3-1 for graphene powder.
Key topics and requirements
- Measurement principle: Raman spectroscopy is used because it is sensitive to structural defects and boundary states in graphene; specific Raman bands (D, D′ and 2D) are used to derive the defect metric.
- Defect metric: Primary metric is the intensity ratio ID+D′ / I2D; this ratio is the basis for classifying defect level in powder samples.
- Scope of applicability: Applicable to graphene in powder physical form (graphene powder and graphene-based materials such as rGO and few-layer graphene).
- Sample preparation and measurement protocol: The document specifies sample preparation, description of equipment, ambient conditions for measurement, calibration procedures, and a detailed measurement protocol.
- Quality assurance: Guidance on measurement accuracy, sources of measurement uncertainty, sampling plans (including multi-point sampling), and data analysis/interpretation are included.
- Reporting: Required test-report elements (product/sample identification, test conditions, measurement-specific information and test results) and recommended report formats are given.
Applications and users
- Primary use cases: Quality control, lot classification, product specification and acceptance testing for graphene powder manufacturers and suppliers.
- Downstream users: Materials selection and procurement by electronics, composites, energy storage, and coating industries that require controlled graphene quality.
- Laboratories and R&D: Analytical labs, QC engineers, and materials scientists deploying standardized Raman methods for reproducible defect quantification and inter-lab comparisons.
Related standards
- IEC 62565-3-1 - referenced as the blank detail specification where the defect level measured by this method will be recorded.
- IEC TS 62607 series - this part (6-14) forms one item within the broader IEC TS 62607 “Nanomanufacturing – Key control characteristics” collection of standards for nanomaterials.
Keywords: graphene defect level, Raman spectroscopy, ID+D′/I2D ratio, graphene powder, reduced graphene oxide (rGO), IEC TS 62607-6-14, quality control, key control characteristic.