GB/T 39978-2021 in English

VALID

Nanotechnology—Resistivity of carbon nanotube powder—Four probe method

Issued on:2021-05-21
Implemented on:2021-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $220.00
$214.00

Standard No:	GB/T 39978-2021
Document status:	VALID
Title in English:	Nanotechnology—Resistivity of carbon nanotube powder—Four probe method
Title in Chinese:	纳米技术碳纳米管粉体电阻率四探针法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2021-05-21
Implemented on:	2021-12-01
ICS Classification:	59.100.20-Carbon materials
Chinese Classification:	G13-Oxide and elementary substance
Professional Classification:	GB-National Standard
Related Keywords:	probe method introduction technical background probe spacing outer probe middle probe carbon nanotube
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《GB/T 39978-2021纳米技术碳纳米管粉体电阻率四探针法》由TC279（全国纳米技术标准化技术委员会）归口，TC279SC1（全国纳米技术标准化技术委员会纳米材料分会）执行，主管部门为中国科学院。

Introduction

Technical background and significance of standards

With the widespread application of nanomaterials in new energy, electronic devices and other fields, the electrical properties of carbon nanotube powders have become a key quality control indicator. The release of GB/T39978-2021 fills the gap in the standardization of nanopowder resistivity test methods in my country. Its technical features include:

For the first time, the applicable conditions of the four-probe resistivity tester in nanopowder testing are clarified
Innovatively proposes a thick block test theory with a thickness greater than 4 times the probe spacing
Establish a complete standardized process from sampling to data analysis

Detailed explanation of the core test principles

The standard adopts the modified thick block model formula: ρ=2πlU/I×1000, and its theoretical basis is:

When the probe spacing l=1mm, the test current I is injected into the sample through the outer probe, and the potential difference U is measured at the middle probe. By controlling the molding pressure (10-20MPa) of the powder tablet press, the density of the sample is ensured and the influence of contact resistance is eliminated.

Test mode	Applicable conditions	Correction coefficient	Error source
Thick block mode	Thickness>4l	2π	Edge effect
Thin layer mode	Thickness≤4l	π/ln2	Substrate effect

Analysis of key operating specifications

1. Sampling preparation requirements

The standard strictly stipulates the sampling process:

Use Rotate the sampler and mix for 10-15 times at 15-30r/min.

Dry at 105℃ for 2h to eliminate the influence of moisture.

The mold diameter needs to be ≥11 times the probe spacing (usually 13mm).

2. Instrument parameter control

A laboratory found that when the test current was improperly selected, it would lead to the following:

Excessive current causes Joule heating effect.

Excessive current reduces the signal-to-noise ratio.

The range should be selected according to standard Table 2, such as a resistivity of 100mΩ·cm corresponds to a current of 1mA.

Implementation suggestions and common problems

Key points of quality control

Regularly calibrate the micrometer screw to ensure thickness measurement accuracy ≥0.01mm

Clean the probe with anhydrous ethanol before each batch of tests

RSD＞5% requires re-sampling

Technical evolution direction

Compared with the 2015 version of the ISO standard, the innovations of this standard are:

Add uncertainty analysis clauses (Chapter 9.2)

Refine the calculation formula for the number of sampling containers (Table 1)

Clear the technical requirement that the mechanical drift rate of the probe is ≤0.3%

More samples: JJG 21-2008 DL/T 5154-2012 GB 50021-2001(2009)

Sample only — not a preview of GB/T 39978-2021

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