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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

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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