This standard specifies the method for the characterization of multiwall carbon nanotubes dispersed in aqueous solutions by using extinction spectroscopy.The correlation between the extinction spectrum and the surface oxidation state and length of carbon nanotubes can be obtained based on the specturm analysis.This standard is applicable to multiwall carbon nanotubes in aqueous solutions.
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This part of GB/T 24369 gives guidelines for the characterization of gold nanorods (GNRs) using optical absorption spectroscopy.The aim of this document is to provide an analytical tool to determine the mean aspect ratio and concentration of GNRs.
The calculation of mean aspect ratio in this standard is applicable to the cylindrical GNRs with mean aspect ratios between 2 to 5 and rod diameters smaller than 30 nm.
This standard is also referred to the characterizations of other noble metal nanostructures using UV-Vis-NIR absorption spectrophotometry.
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