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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


References:
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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