GB/T 24370-2021 PDF English
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Nanotechnologies - Characterization of cadmium chalcogenide colloidal quantum dot - UV-Vis absorption spectroscopy
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| GB/T 24370-2009 | English | 540 |
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Characterization of CdSe quantum dot nanocrystals-UV-Vis absorption spectroscopy
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GB/T 24370-2021: Nanotechnologies - Characterization of cadmium chalcogenide colloidal quantum dot - UV-Vis absorption spectroscopy
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.50
CCS G 30
Replacing GB/T 24370-2009
Nanotechnologies - Characterization of Cadmium
Chalcogenide Colloidal Quantum Dot - UV-Vis Absorption
Spectroscopy
(ISO/TS 17466.2015, Use of UV-Vis absorption spectroscopy in the characterization
of cadmium chalcogenide colloidal quantum dots, MOD)
Issued on. DECEMBER 31, 2021
Implemented on. JULY 1, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 6
1 Scope... 7
2 Normative References... 7
3 Terms and Definitions... 7
4 Abbreviations and Symbols... 8
5 Principle... 9
6 Sample Preparation... 12
7 Test Procedures... 12
8 Data Analysis and Result Expression... 13
9 Measurement Uncertainty... 13
10 Test Report... 14
Appendix A (informative) Example of Determining the Diameter of CdSe Quantum
Dots using UV-Vis Absorption Spectrum... 15
Appendix B (informative) Example of Determining Particle Concentration of CdSe
Quantum Dots in Dispersion Liquid... 23
Bibliography... 27
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 24370-2009 Characterization of CdSe
Quantum Dot Nanocrystals - UV-Vis Absorption Spectroscopy. In comparison with GB/T
24370-2009, apart from structural adjustments and editorial modifications, the main technical
changes are as follows.
---The scope of application is expanded. from CdSe quantum dots to cadmium
chalcogenide (CdTe, CdSe and CdS) quantum dots, and the diameter range of
applicable CdSe quantum dots is clarified (see Chapter 1; Chapter 1 of Version 2009);
---CdTe, CdSe and CdS are added throughout the text;
---The term and definition of “quantum confinement” is added (see 3.2);
---Abbreviations and Symbols is added (see Chapter 4);
---The values of coefficients A, B, C, D and E in the relational expression between the
diameter of CdSe quantum dots and the first excitonic absorption peak are corrected
(see 5.4; 4.3 of Version 2009);
---The relational expression between the diameter of CdTe and CdS quantum dots and the
first excitonic absorption peak is added (see 5.4);
---The content of absorbance correction for samples with wide size distribution is added
(see 5.5.2);
---The content of Measurement Uncertainty in Chapter 9 is added;
---The content of Appendix A is modified from “UV-visible absorption spectral line
analysis of cadmium selenide quantum dot nanocrystals” into “example of determining
the diameter of CdSe quantum dots using UV-Vis absorption spectrum”;
---The content of Appendix B is modified from “synthesis of cadmium selenide quantum
dot nanocrystals by high-temperature oil phase pyrolysis method” into “example of
determining the particle concentration of CdSe quantum dots in dispersion liquid”;
---Appendix C - Test Report in Version 2009 is deleted.
This document modifies and adopts ISO/TS 17466.2015 Use of UV-Vis Absorption
Spectroscopy in the Characterization of Cadmium Chalcogenide Colloidal Quantum Dots. The
type of the document is adjusted from ISO technical specifications to a national standard of
China.
The Chapter Normative References is added to this document.
In comparison with ISO/TS 17466.2015, this document makes the following structural
adjustments.
---Terms, Definitions and Abbreviated Terms in Chapter 3 (TRANSLATOR’S NOTE. it
should be Chapter 2) of ISO/TS 17466.2015 is modified into Chapter 3 Terms and
Definitions, and Chapter 4 Abbreviations and Symbols;
---“General Rule” is added to 3.5 of ISO/TS 17466.2015 (see 5.5.1);
---The first sentence of Chapter 6 in ISO/TS 17466.2015 is moved to “Estimation of
Quantum Dot Size” (see 8.1).
The technical differences between this document and ISO/TS 17466.2015, and the causes for
these differences are as follows.
---The definition of “quantum confinement” is modified, and NOTE 2 is added, so as to
adapt to the specific conditions of China;
---The last paragraphs of “5.4” and “5.5” are deleted, so as to avoid duplication with
Chapter 10 Test Report.
This document makes the following editorial modifications.
---The title of the document is modified into Nanotechnologies - Characterization of
Cadmium Chalcogenide Colloidal Quantum Dot - UV-Vis Absorption Spectroscopy;
---The sequence of the sample preparation part in Chapter 6 is adjusted;
---The abbreviation HRTEM is added, and FWHM, which is not quoted in the text, is
deleted;
---The coefficient forms following Formula (1), Formula (2) and Formula (3) are modified;
---For the convenience of application, the form of Formula (4) is modified;
---The informative references GB/T 32269-2015 and ISO 13322-1.2004 are incorporated
into Bibliography.
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by Chinese Academy of Sciences.
This document shall be under the jurisdiction of National Technical Committee 279 on
Nanotechnology of Standardization Administration of China (SAC/TC 279).
The drafting organization of this document. National Center for Nanoscience and Technology;
Beijing CEAULIGHT Technology Co., Ltd.; Wuhan Jiayuan Quantumdots Co., Ltd.; Nankai
University; Beijing Beida Jubang Science & Technology Co., Ltd.; Beijing Institute of
Technology; Najing Technology Co., Ltd.; Techcomp Laboratory Equipment (Shanghai) Co.,
Ltd.; Shanghai Jiao Tong University; Shenzhen Sungening Biological Co., Ltd.; Inner Mongolia
Xinyu Rare Earth Functional Materials Co., Ltd.
The main drafters of this document. Ge Guanglu, Zhang Donghui, Cai Chunshui, Wang Xinwei,
Pang Daiwen, Zhu Dongliang, Guo Haiqing, Zhong Haizheng, Kang Yongyin, Zhao Zhiqiang,
Zhang Hairong, Wang Ruibin, Huang Shenghong, Ji Daiyu, Liu Renxiao, Zhang Xuan.
The issuing of the previous versions.
---Firstly issued in 2009;
---This is the first revision.
1 Scope
This Standard provides a method for evaluating the diameter and particle concentration of
monodisperse cadmium chalcogenide (CdTe, CdSe and CdS) colloidal quantum dots using UV-
Vis absorption spectroscopy.
2 Normative References
This document does not have normative references.
3 Terms and Definitions
The following terms and definitions are applicable to this Standard.
Light absorption generated when electrons in quantum dots transition from the ground state to
the first excitonic excited state.
4 Abbreviations and Symbols
The following abbreviations are applicable to this document.
5 Principle
Figure 1 is a typical UV-Vis absorption spectrum of CdSe colloidal quantum dots. The peak at
545 nm is the first excitonic absorption peak of quantum dots, which is the absorption peak
with the lowest energy (longest wavelength). It is generated by electrons transitioning from the
valance band to the conduction band after absorbing photons.
6 Sample Preparation
The sample for the determination of the absorption spectrum shall be a uniform and stable
quantum dot dispersion liquid.
In order to guarantee the applicability of the Beer-Lambert Law, a dilute dispersion liquid with
an absorbance (A) of the first excitonic absorption peak less than 1 shall be used for testing.
7 Test Procedures
Refer to the instrument’s instruction manual and follow standard procedures for measuring
absorption spectra. Place the sample to be measured in a quartz cuvette, place the pure solvent
of dispersed quantum dots in another identical quartz cuvette as a reference for background
subtraction. At room temperature and normal pressure, carry out the test.
8 Data Analysis and Result Expression
Record the wavelength and absorbance at the maximum absorption point of the first excitonic
absorption peak. Within the applicable size range of the formula, utilize the Formula in 5.4 and
the recorded wavelength at the first excitonic absorption peak to calculate the average diameter
d.
9 Measurement Uncertainty
In accordance with the universal method described in Bibliography [9] or an equivalent
document, evaluate the obtained measurement uncertainty of quantum dot diameter and particle
concentration, which shall include the sources listed below.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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