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GB/T 47182-2026Microbeam analysis - Analytical electron microscopy - Method for determining the shell thickness of core-shell particles (English PDF)

微束分析　分析电子显微术　核壳颗粒壳壁厚度的测量方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

February 27, 2026

Implementation date

September 1, 2026

Scope

GB/T 47182-2026 is the English-translated version of 微束分析　分析电子显微术　核壳颗粒壳壁厚度的测量方法.

GB/T 47182-2026 is the Chinese standard "Microbeam analysis - Analytical electron microscopy - Method for determining the shell thickness of core-shell particles".

Its scope clause reads: This document describes the acquisition of nanoscale core-shell materials using transmission electron microscopy/scanning transmission electron microscopy (TEM/STEM).

A method for projecting patterns and measuring their shell thickness (10nm~100nm). This document applies to digital images of micro/nano particles recorded by TEM/STEM and those equipped with energy-dispersive X-ray spectrometers (EDS) or electronic spectrometers.

The elemental distribution map recorded by the energy loss sub-elemental spectrometer (EELS) is used to measure the shell thickness. It is applicable to measuring particle core diameters ranging from 10 nm.

1µm. This document does not apply to particles with horizontally projected shapes where the Z-direction is greater than the X-direction or Y-direction, or particles with complex geometric horizontally projected shapes.

Particles, such as sea urchin-like nanoparticles. Note. The main reason is that when the measured shell thickness fluctuates by more than 20% of the minimum cross-sectional diameter, the uncertainty of this document will increase significantly. Its clauses include terms and definitions.

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Document preview — GB/T 47182-2026

National Standard of the People's Republic of China

ICS: 71.040.50

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
Introduction
1.Scope
2 Normative References
3.Terms and Definitions
4.Abbreviations
5.Sample Preparation
5.1 Preparation Method
5.2 Requirements for Specimens
6.Instruments and Equipment
6.1 Equipment Requirements
6.2 Equipment Calibration
7.Measurement of shell thickness
7.1 Acquisition of Digital Images
7.2 ROI Settings
7.3 Obtaining the Mean Intensity Curve
7.4 Determining the Measurement Location
7.5 Methods of expressing shell thickness
8 Uncertainty
Appendix A (Informative) Example 10 of Measuring the Shell Wall Thickness of Nanocore-Shell Particles
Appendix B (Informative) Example 19 of measuring shell thickness using elemental surface distribution maps
References

1 Scope

This document describes the acquisition of nanoscale core-shell materials using transmission electron microscopy/scanning transmission electron microscopy (TEM/STEM).

A method for projecting patterns and measuring their shell thickness (10nm~100nm).

This document applies to digital images of micro/nano particles recorded by TEM/STEM and those equipped with energy-dispersive X-ray spectrometers (EDS) or electronic spectrometers.

1µm.

This document does not apply to particles with horizontally projected shapes where the Z-direction is greater than the X-direction or Y-direction, or particles with complex geometric horizontally projected shapes.

Particles, such as sea urchin-like nanoparticles.

Note. The main reason is that when the measured shell thickness fluctuates by more than 20% of the minimum cross-sectional diameter, the uncertainty of this document will increase significantly.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 27418 Evaluation and Expression of Measurement Uncertainty

GB/T 34002 Method for calibrating image magnification using periodic structure standard materials in microbeam analysis transmission electron microscopy

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Core-shell material

Materials whose basic structure is formed by one material forming a micro- or nano-hollow shell or by encapsulating another nanomaterial inside.

Note. Hollow shell refers to a structure with a certain wall thickness and an internal cavity.

3.2

The geometric shape projected onto a horizontal plane after the electron beam penetrates the sample vertically.

3.3 Contrast

The difference in signal strength between two arbitrary selected points (P1, P2) of interest on the image, expressed as the maximum signal strength obtained under specific operating conditions.

The intensity of the signal is normalized.

Note. Contrast is expressed by formula (1).

C =|S2-S1|/Smax(0< C < 1) (1)

In the formula.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.

Referenced standards

Normative references

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