ISO/TS 17466:2015
Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots
ISO/TS 17466:2015 provides guidelines for estimating the diameter and the number concentration of monodisperse cadmium chalcogenide (CdTe, CdSe, CdS) quantum dots (QDs) with a narrow size distribution in a colloidal dispersion using Ultraviolet-visible (UV-Vis) absorption spectroscopy.
The analysis of the spheroidal particle size is applicable to the diameter range of 3,5 nm to 9 nm for CdTe, 1 nm to 8 nm for CdSe, and 1 nm to 5,5 nm for CdS and is recommended for samples with narrow size distributions.
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Foreword
Introduction
1 Scope
2 Terms, definitions, and abbreviated terms
2.1 Terms and definitions
2.2 Abbreviated terms
3 Principle
3.1 General
3.2 UV-Vis absorption spectroscopy
3.3 Absorption peaks of quantum dots in the UV-Vis region
3.4 Relation between quantum dot diameter and optical absorption peak wavelength
3.5 Relation between quantum dot concentration and optical absorption peak intensities
3.5.1 Normalization of absorbance A for samples with wide size distributions
3.5.2 Derivation of extinction coefficient ε from particle size
4 Sample preparation
5 Measurement procedure
5.1 UV-Vis spectrometer
5.2 Optical measurement procedure
5.3 Recommended conditions
6 Data analysis and interpretation of results
6.1 Data analysis for approximation of QD size
6.2 Data analysis for characterization of QD concentration
7 Measurement uncertainty
8 Test report
Annex A (informative) Case study for determining the diameters of CdSe QDs from UV-Vis absorption spectra
Annex B (informative) Case study for determining the number concentrations of CdSe QDs in a dispersion
Bibliography
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Foreword
Introduction
1 Scope
2 Terms, definitions, and abbreviated terms
2.1 Terms and definitions
2.2 Abbreviated terms
3 Principle
3.1 General
3.2 UV-Vis absorption spectroscopy
3.3 Absorption peaks of quantum dots in the UV-Vis region
3.4 Relation between quantum dot diameter and optical absorption peak wavelength
3.5 Relation between quantum dot concentration and optical absorption peak intensities
3.5.1 Normalization of absorbance A for samples with wide size distributions
3.5.2 Derivation of extinction coefficient ε from particle size
4 Sample preparation
5 Measurement procedure
5.1 UV-Vis spectrometer
5.2 Optical measurement procedure
5.3 Recommended conditions
6 Data analysis and interpretation of results
6.1 Data analysis for approximation of QD size
6.2 Data analysis for characterization of QD concentration
7 Measurement uncertainty
8 Test report
Annex A (informative) Case study for determining the diameters of CdSe QDs from UV-Vis absorption spectra
Annex B (informative) Case study for determining the number concentrations of CdSe QDs in a dispersion
Bibliography