量子点，又可称为纳米晶，是一种由II－VI族或III－V族元素组成的纳米颗粒。量子点的粒径一般介于1～10 nm之间，由于电子和空穴被量子限域，连续的能带结构变成具有分子特性的分立能级结构，受激后可以发射荧光。量子点具有吸收光谱宽、发射光谱窄而对称、生物相容性好、荧光寿命长等优点，在太阳能电池、发光器件和生物标记等领域具有广泛的应用前景。
百灵威与美国著名工厂STREM合作，引进的新产品量子点，不仅是一种新型纳米材料，还是一种理想的荧光探针。
CdSe/CdS/ZnS
Strem offers the following Quantum Dots
Core: CdSe
Core/Shell: CdSe/CdS
Core/Shell/Shell: CdSe/CdS/ZnS
The CdSe core is highly uniform with a narrow particle size distribution (±10%). The CdS shell is less than 1nm and stabilizes the core. The second shell of ZnS provides additional stability and is 1-2 nm thick.
Product characteristics:
High Quantum Yield- Longer term stability
- Scalability (produced via continuous flow)
- High batch-to-batch reproducibility (TEM available for each lot)
- Emission range 500-650nm
- Homogeneous dispersions in different non-polar solvents possible
- Flexibility for ink or composite preparation
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Structure
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Ligand Capping Agent
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Stability of Dispersions
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Quantum Yield
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Emission Range
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CdSe
core |
Oleylamine
|
6 months
|
> 10%
|
500-625 nm
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CdSe/CdS
core/shell |
Oleylamine
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> 6 months
|
> 30%
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550-625 nm
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CdSe/CdS/ZnS
core/shell/shell |
Hexadecylamine
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> 12 months
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> 30-40%
|
525-650 nm
|
uantum dots manufactured by and registered trademarks owned by Center for Applied Nanotechnology (CAN).
Sold in collaboration with CAN for research purposes.
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Peak Emmission
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Particle Size (diameter)
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Strem Catalog No. (in hexane)+
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Quantum Yield
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CdSe
core |
|||
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500 nm
|
2.7 nm
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48-1005
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> 10%
|
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525 nm
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2.8 nm
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48-1011
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> 10%
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550 nm
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3.5 nm
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48-1017
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> 10%
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575 nm
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3.9 nm
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48-1023
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> 10%
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600 nm
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4.7 nm
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48-1030
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> 10%
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625 nm
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5.3 nm
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48-1035
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> 10%
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Kit: 500-625 nm
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96-0800
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> 10%
|
|
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Kit contains 5ml of each of the above 6 products. Ligand capping agent oleylamine. Stable in dispersions 6 months.
|
|||
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CdSe/CdS
core/shell
|
|||
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550 nm
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3.7 nm
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48-1040
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> 30%
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575 nm
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4.1 nm
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48-1046
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> 30%
|
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600 nm
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4.9 nm
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48-1052
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> 30%
|
|
625 nm
|
5.6 nm
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48-1057
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> 30%
|
|
Kit: 500-625 nm
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96-0810
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> 30%
|
|
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Kit contains 1ml of each of the above 4 products. Ligand capping agent oleylamine. Stable in dispersions >6 months.
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|||
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CdSe/CdS/ZnS
core/shell/shell
|
|||
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525 nm
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2.7 nm
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48-1061
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> 40%
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550 nm
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4.6 nm
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48-1063
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> 40%
|
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575 nm
|
5.1 nm
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48-1070
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> 40%
|
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600 nm
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6.0 nm
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48-1075
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> 40%
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|
625 nm
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6.6 nm
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48-1080
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> 30%
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650 nm
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8.5 nm
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48-1086
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> 30%
|
|
Kit: 525-650 nm
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96-0820
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> 30 - 40%
|
|
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Kit contains 1ml of each of the above 5 products. Ligand capping agent hexadecylamine. Stable in dispersions >12 months.
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|||
All sizes determined by TEM except for 650nm CdSe/CdS/ZnS which is calculated.
+ Available at nanoparticle concentration of 50μmol per liter.
Store cold in dark under inert atmosphere
Typical spectra for CdSe core quantum dots.
