Single wall carbon nanotubes (SWCNTs) are one of the most prominent nano-objects in
the burgeoning nanotechnology field. SWCNTs are a key component of nanotechnology and
suggested to have transformative potential in many sectors. ISO/TS 11251:2010 describes the
use of evolved gas analysis/gas chromatograph mass spectrometry (EGA/GCMS) to
characterize volatile components in single-wall carbon nanotubes (SWCNTs).
Evolved gas analysis is a technique that determines the nature and/or amount of volatile
products in a sample at a controlled temperature using its evolved gas signature. To determine
the volatile components, mass spectrometry is employed. In cases where many components are determined, gas chromatography is also applied to separate the gases for individual analysis.
The contents of the standard include:
Terms and definitions
Principle
Apparatus descriptions
Sample preparation
Measurement procedures for EGA/MS and EGA/GCMS
Qualitative and mass loss analysis
Precision, uncertainties and reporting
Informative case study annex
EGA/GCMS is able to qualitatively determine volatile components in SWCNTs and
quantitatively examine the total volatile mass percentage. This method cannot determine the
individual volatile components quantitatively as developing the calibration curves for multiple
analytes is not possible.
The case study annex gives examples of test procedures and results. Information on
sources of error is included. Figure 4 shows an example of an output spectrum.
