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QSA is a group of water soluble alloy CdSSe/ZnS or CdSe/ZnS core/shell quantum dots with amphiphilic polymer and PEG coating. The reactive group is amine. The zeta potential of QSA is from -20mV to +10mV. The organic layers consist of a monolayer of oleic acid/octadecylamine, a monolayer of amphiphilic polymer and a monolayer of PEG. The thickness of the total organic layers is about 6 nm. The hydrodynamic size of the QDs is about 12-14 nm larger than their inorganic core size measured by TEM.
QSA is very stable in most buffer solutions in the pH range of 5-10 and can survive autoclaving process (121°C for 30 min). The amine density of QSA is low due to the long PEG chain.
Catalog No.Quantum Yield1FWHM2Emission PeakAmount(Particle)Price($) 
QSA-450-02>50%<35 nm450 nm2 nmol299.00
QSA-450-10>50%<35 nm450 nm10 nm899.00
QSA-490-02>50%<35 nm490 nm2 nmol299.00
QSA-490-10>50%<35 nm490 nm10 nmol899.00
QSA-525-02>50%<35 nm525 nm2 nmol299.00
QSA-525-10>50%<35 nm525 nm10 nmol899.00
QSA-540-02>50%<35 nm540 nm2 nmol299.00
QSA-540-10>50%<35 nm540 nm10 nmol899.00
QSA-580-02>50%<25 nm580 nm 2 nmol299.00
QSA-580-10>50%<25 nm580 nm10 nm899.00
QSA-600-02>50%<25 nm600 nm2 nmol299.00
QSA-600-10>50%<25 nm600 nm10 nmol899.00
QSA-620-02>50%<25 nm620 nm2 nmol299.00
QSA-620-10>50%<25 nm620 nm10 nmol899.00
QSA-645-02>50%<35 nm645 nm2 nmol299.00
QSA-645-10>50%<35 nm645 nm10 nmol899.00
QSA-665-02>50%<35 nm665 nm2 nmol299.00
QSA-665-10>50%<35 nm665 nm10 nmol899.00
1. Quantum Yield: measured using an integrating sphere.
2. FWHM: Full Width of Half Maximum

1. L. Yang, H. Mao, Y. A. Wang, Z. Cao, X. Peng, X. Wang, H. Duan, C. Ni, Q. Yuan, G. Adams, M. Q. Smith, W. C. Wood, X. Gao, S. Nie. Single Chain Epidermal Growth Factor Receptor Antibody Conjugated Nanoparticles for in vivo Tumor Targeting and Imaging. Small, 2009, 5, 235-243.
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