Product Description
CdSe/CdS core-shell quantum rods are elongated quantum dots composed of nanoscale cadmium selenide and cadmium sulfide with excellent optoelectronic properties such as tunable emission wavelengths, high extinction coefficients, polarized emission, enhanced quantum yields, and brightness an order of magnitude higher. Alfa Chemistry offers CdSe/CdS core-shell quantum rods in wavelengths from 530 nm to 620 nm, or we can customize the right product for your project.
Applications
Lasers
Colloidal semiconductor quantum rods have demonstrated many favorable properties as light emitters, such as high quantum yields, tunable emission wavelengths, and polarized emission. reduction. They also fabricated the devices by depositing small droplets of the quantum rod solution onto a flat substrate. The evaporation kinetics of the droplets are governed by the coffee-stain effect, which leads to the formation of well-defined micron-scale stripes. These stripes consist of densely packed, laterally aligned quantum rods and provide optical feedback from abrupt changes in refractive index originating at the stripe boundaries. MargheritaZavelani-Rossi et al. used optical gain and coffee-stain-mediated self-assembly to show that novel micro lasers can be fabricated by depositing droplets of quantum rod solution on a flat substrate alone.
Fig. 1 (a) A representative TEM image of CdSe/CdS core/shell QRs. (b) A simplified sketch illustrating the band alignments and electronic levels within a CdSe/CdS core/shell QR. ( MargheritaZavelani-Rossi, 2010)
Biosensing
Wang et al. introduced an ultra-efficient cap exchange scheme and extended this efficient cap exchange method to commercially hydrophobic CdSe/CdS core/shell quantum rods (QR) with DHLA-based ligands. Similar to previous conventional CdSe/ZnS quantum dots, stable QR aqueous dispersions can be easily prepared at low molar ratios. The fluorescence of QR can be slowly restored upon exposure to ambient room light and by exposure to intense light in the near-UV to visible region of the spectrum (with light wavelengths of 350-450 nm being optimal). In addition, fluorescence regeneration of QR is easily functionalized with Affimers (small antibody mimetic proteins) for FRET-based ratiometric biosensing or biotin for targeted imaging of cancer cells.
Fig.2 The scheme showing the Affimer-SUMO protein binding induced FRET mechanism. (Wang, 2020)
Our products are constantly updated. If the product you need is not in our catalog, please feel free to contact us , we provide relevant custom services.
References
- MargheritaZavelani-Rossi, et al. Lasing in self-assembled microcavities of cdse /cds core/shell colloidal quantum rods. Nanoscale 2.6(2010):931-935.
- Wang Weili, et al. Photon induced quantum yield regeneration of cap-exchanged CdSe/CdS quantum rods for ratiometric biosensing and cellular imaging. Nanoscale, 2020, 12(16).
* It should be noted that our service is only used for research, not for clinical use.
