Chinese Standard: 'GB/T 24370-2009'
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Characterization of CdSe quantum dot nanocrystals-UV-Vis absorption spectroscopy
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GB/T 24370-2009
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| GB/T 24370-2009 | Chinese | 16 |
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| Standard ID | GB/T 24370-2009 (GB/T24370-2009) | | Description (Translated English) | Characterization of CdSe quantum dot nanocrystals-UV-Vis absorption spectroscopy | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G30 | | Classification of International Standard | 71.040.50 | | Word Count Estimation | 15,113 | | Date of Issue | 2009-09-30 | | Date of Implementation | 2009-12-01 | | Drafting Organization | National Center for Nanoscience | | Administrative Organization | Nanotechnology National Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2009 No.10 (Total No.150) | | Summary | This standard specifies the cadmium selenide (CdSe) quantum dot nanocrystals UV-visible absorption spectroscopy characterization methods. This standard applies to the surfactant molecules-dispersion octyl phosphine oxide is three (TOPO, Trioctylphosphine) coated CdSe quantum dot nanocrystals formed in n-hexane. Dispersions other surfactant molecules coated CdSe quantum dot nanocrystals in a variety of non-polar reagent formed, synthesized in aqueous systems blessing selenide quantum dots and other semiconductor nanocrystal quantum dots composed of nano- crystal UV-visible absorption spectroscopy to characterize it may refer to this standard. | GB/T 24370-2009
Characterization of CdSe quantum dot nanocrystals-UV-Vis absorption spectroscopy
ICS 71.040.50
G30
National Standards of People's Republic of China
CdSe quantum dot nanocrystals Characterization
UV - visible absorption spectroscopy method
Posted 2009-09-30
2009-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
The Standard Appendix A, Appendix B and Appendix C are informative appendices.
This standard was proposed by the Chinese Academy of Sciences.
This standard by the National Standardization Technical Committee of nano technology (SAC/TC279) centralized.
This standard is drafted by. National Center for Nanoscience.
Participated in the drafting of this standard. Beijing Technology and Business University, Wuhan University, Wuhan Jia sources of quantum dot technology development company.
The main drafters of this standard. Ge Canton Road, forbearance Liu Xiao, Ji Tian Hao, Pang Diovan, Zhu Xiaobo, Gao Jie, Zhao Rui.
introduction
Semiconductor nanocrystals (also called quantum dots, semiconductor quantum dot) is made of a semiconductor material (such as CdSe, CdTe, etc. Ⅱ ~ Ⅵ family or InP,
Ⅲ ~ Ⅴ InAs and other compounds) composed of 1nm ~ 100nm in size between the nano-materials, wherein selenide (of CdSe) Cadmium nano crystals
Has excellent size and shape controllability, is the most studied, most have a class representative. Semiconductor nanocrystals due to existence of the quantum size effect
In the exhibit size-dependent optical and electrical properties of. Compared with conventional organic dye molecule fluorescence probe, the spectra of semiconductor nanocrystals
Nature has obvious advantages. excitation wave length and width and continuous distribution, emitting very narrow wavelength range, making it possible to observe simultaneously multiple wavelengths; luminous
High strength, better photochemical stability, very beneficial for a long time on the dynamic of multi-cellular life phenomena were observed. Based on the above properties
Quality semiconductor nanocrystals in drug screening, biomarkers, cell tracking, flow microfluidic chip immunoassay, rapid diagnosis of sensitization, etc.
It began to be widely used.
UV - visible absorption spectroscopy (UV-Visabsorptionspectroscopy) is the use of the material elements of the UV - visible light absorption
Commonly used laboratory method for spectral analysis of the structure and composition of the material content of the analysis measurement can be practical and convenient way of semiconductor nano
The optical properties of the crystals were characterized, and the structure of the information obtained. UV - visible absorption spectra were when subjected to spectral measurement, characterized suck
Closing peak and molar absorption coefficient and particle size have a direct correlation. In the known semiconductor nanocrystals per mole of the absorption coefficient ([epsilon]) of
Under the premise of the Lambert - Beer law (A = εCL) can be simply and accurately calculate the molar concentration of quantum dot nanocrystals dispersion.
CdSe quantum dot nanocrystals Characterization
UV - visible absorption spectroscopy method
1 Scope
This standard specifies the cadmium selenide (CdSe) quantum dot nanocrystals UV - visible absorption spectroscopy characterization methods.
This standard applies to the amount of cadmium selenide by the surfactant molecules --- n trioctyl phosphine oxide (TOPO, Trioctylphosphine) coated
Dispersion of nanocrystals quantum dots formed in n-hexane. Other surfactant molecules coated cadmium selenide quantum dot nanocrystals in various non
Polar dispersion agent formed in the aqueous system synthesis of CdSe quantum dot nanocrystals and other semiconductor quantum dots Carolina
UV meters crystals - visible absorption spectra can also be characterized by reference to this standard.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 9721-2006 Chemicals General molecular absorption spectrophotometry (UV and visible part)
GB/T 19267.2-2003 criminal and chemical examination of trace evidence in Part 2. UV - visible absorption spectroscopy
GB/T 19619-2004 nanomaterials term
JJG178-2007 ultraviolet, visible, near-infrared spectrophotometer test procedures
3 Terms and Definitions
GB/T 19619-2004 and established the following terms and definitions apply to this standard.
3.1
At room temperature quantum size effect of nanocrystals.
NOTE. quantum size effect as defined in GB/T 19619-2004 3.3.3.
3.2
Semiconductor UV - visible absorption by the electron from the valence band to the conduction band transitions peaks generated spectrum.
Note 1. The absorption peaks as defined in GB/T 9721-2006 3.1.
Note 2. For semiconductor nanocrystals absorption band edge may also be referred to as first exciton absorption peak.
4 principle of the method
4.1 UV - visible absorption spectroscopy
By incident light intensity (I) of the sample prior to its initial incident intensity (I0 is) the ratio I/I0 as sample transmittance (T), typically one hundred
Fractional representation. By the Lambert - Beer law (Lambert-Beer'sLaw), absorbance (A) can be expressed as -lg (T). Specific compound
Was, when its outer electron valence electron or selective absorption of UV - visible light (200nm ~ 760nm) energy from the ground state to achieve
Excited state, when the low energy level to a high energy level transition, will produce characteristic absorption, the absorption rate of the sample can be obtained with a corresponding wavelength curve, called purple
Outside - visible absorption spectrum. UV - visible absorption spectroscopy is often used to characterize the compounds of analytical methods and quantitative analysis.
4.2 UV quantum dot semiconductor nanocrystals - visible absorption spectrum
Ultraviolet semiconductor quantum dot nanocrystals - visible absorption from the nanocrystals electrons from the valence band to the conduction band transitions, namely interband absorption
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