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QSH is a group of water soluble alloy CdSSe/ZnS or CdSe/ZnS core/shell quantum dots with amphiphilic polymer coating. Their reactive group is carboxylic acid. The zeta potential of QSH is from -30mV to -50mV. Their organic layers consist of a monolayer of oleic acid/octadecylamine and a monolayer of amphiphilic polymer. The thickness of the total organic layers is about 4 nm. The hydrodynamic size of the QDs is about 8-10 nm larger than their inorganic core size measured by TEM.
QSH is very stable in most buffer solutions in the pH range of 5-10 and can survive the autoclaving (121°C for 30 min) and lyophilization processes.
Catalog No.Quantum Yield1FWHM2Emission PeakAmount(Particle)Price($) 
QSH-450-04>50%<35 nm450 nm4 nmol229.00
QSH-450-20>50%<35 nm450 nm20 nmol849.00
QSH-490-04>50%<35 nm490 nm4 nmol229.00
QSH-490-20>50%<35 nm490 nm20 nmol849.00
QSH-525-04>50%<35 nm525 nm4 nmol229.00
QSH-525-20>50%<35 nm525 nm20 nmol849.00
QSH-540-04>50%<35 nm540 nm4 nmol229.00
QSH-540-20>50%<35 nm540 nm20 nmol849.00
QSH-580-04>50%<25 nm580 nm4 nmol229.00
QSH-580-20>50%<25 nm580 nm20 nmol849.00
QSH-600-04>50%<25 nm600 nm4 nmol229.00
QSH-600-20>50%<25 nm600 nm20 nm849.00
QSH-620-04>50%<25 nm620 nm4 nmol229.00
QSH-620-20>50%<25 nm620 nm20 nmol849.00
QSH-645-04>50%<35 nm645 nm4 nmol229.00
QSH-645-20>50%<35 nm645 nm20 nmol849.00
QSH-665-04>50%<35 nm665 nm4 nmol229.00
QSH-665-20>50%<35 nm665 nm20 nmol849.00
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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