GB/T 24370-2021 in English

VALID

Nanotechnologies—Characterization of cadmium chalcogenide colloidal quantum dot—UV-Vis absorption spectroscopy

Issued on:2021-12-31
Implemented on:2022-07-01
File Format:PDF
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Standard No:	GB/T 24370-2021
Document status:	VALID
Title in English:	Nanotechnologies—Characterization of cadmium chalcogenide colloidal quantum dot—UV-Vis absorption spectroscopy
Title in Chinese:	纳米技术镉硫族化物胶体量子点表征紫外-可见吸收光谱法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2021-12-31
Implemented on:	2022-07-01
Superseding:	GB/T 24370-2009 Characterization of CdSe quantum dot nanocrystals - UV - Vis absorption spectroscopy
ICS Classification:	71.040.50-Physicochemical methods of analysis
Chinese Classification:	G30-Synthetic materials in general
Professional Classification:	GB-National Standard
Related Keywords:	cadmium chalcogenide colloidal quantum cadmium chalcogenide colloidal quantum dots quantum dot particle size determination uv-vis absorption spectroscopy uv-vis absorption spectroscopy introduction analysis
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Quantum dot characterization methods Specific methods for measuring UV absorption Silver nitrate standard UV absorption spectrum Quantum dot size distribution characterization method Characterization methods of silicon quantum dots

《GB/T 24370-2021纳米技术镉硫族化物胶体量子点表征紫外-可见吸收光谱法》由TC279（全国纳米技术标准化技术委员会）归口，主管部门为中国科学院。

Introduction

Analysis of the core content of the standard

As an important standard in the field of nanotechnology, GB/T24370-2021 systematically standardizes the technical method of using UV-Vis absorption spectroscopy to characterize cadmium chalcogenide colloidal quantum dots. Compared with the 2009 version, three major technical upgrades have been achieved:

Expansion of the scope of application: from a single CdSe to three types of quantum dots, CdTe/CdSe/CdS
Improvement of model accuracy: updating the coefficients of the particle size-absorption peak relationship equation, and adding CdTe/CdS calculation model
Improvement of the process: adding chapters on the correction method for wide distribution samples and the evaluation of measurement uncertainty

Key technologies for quantum dot particle size determination

The core innovation of the standard lies in the establishment of a quantitative relationship model between particle size and absorption peak:

Quantum dot type	Applicable particle size range (nm)	Relationship characteristics
CdTe	3.5-9	Cubic polynomial (Formula 1)
CdSe	1-8	Quadratic polynomial (Formula 2)
CdS	1-5.5	Cubic polynomial (Formula 3)

Note in actual application: A wavelength measurement error of 1nm will result in a particle size deviation of approximately 0.02nm. It is recommended to use a standard filter to calibrate the spectrometer.

Comparison of particle concentration determination methods

The standard provides two concentration determination paths:

Direct calculation method: Calculated by Beer-Lambert formula combined with particle size-related extinction coefficient
Correction method: HWHM normalization is used for wide distribution samples (Formula 5)

Appendix B verification shows that the deviation between the UV-Vis method and ICP-MS results is in the range of 5-15%. The main sources of uncertainty are:

Intrinsic error of the model formula (up to 50%)
Non-ideal monodispersity of quantum dots
Instrument calibration accuracy

Recommendations for the implementation of the standard

To ensure the quality of the test, it is recommended that:

1. Sample preparation: Use matching surface ligands (such as TOPO, HDA, etc.) to maintain absorbance A<1

2. Instrument settings: Recommended parameter combination - wavelength range 250-750nm, step size 0.5/1nm, slit 1/2nm

3. Result report: The "UV-Vis absorption peak equivalent" attribute and standard basis must be indicated

This standard is particularly suitable for quantum dot synthesis process optimization and product quality control scenarios, providing key characterization basis for applications such as biomarkers and optoelectronic displays.

More samples: GB 50021-2001(2009) NB/T 47013.2-2015 QC/T 942-2021

Sample only — not a preview of GB/T 24370-2021

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