Perovskite Quantum Dots Supplier - Alfa Chemistry

Mononuclear Water-soluble CdTe Quantum Dots (carboxy amino Modification)


Product Description

Alfa Chemistry can provide mononuclear water-soluble CdTe quantum dots (carboxy amino Modification) in the spectral emission range from 518 nm to 618 nm wavelengths. CdTe quantum dots, as a new nanomaterial, have unique fluorescence properties and are widely used in fluorescent probes, drug screening, medical imaging, targeted therapy and other life sciences.


Fluorescence Probes

Chen et al. reported a sensitive and selective fluorescence method for the detection of uranyl ions using mercaptopropionic acid functionalized CdTe quantum dots, which can quantitatively burst the fluorescence of the quantum dots through an electron transfer mechanism. The detection limit of this method is estimated to be 4 nM, which is lower than the maximum allowable level of 130 nM for uranyl in drinking water set by the U.S. Environmental Protection Agency. the selectivity of CdTe-MPA quantum dots functionalized with masking agent is better than that of CdS-MAA-TU quantum dots, which can effectively distinguish Pb(II), Hg(II), and Cu(II) ions. In addition, it reacts rapidly to uranyl ions and fluoresces stably within 1 min. the CdTe-MPA quantum dots also have excellent fluorescence stability and anti-bleaching properties. The fluorescence linear concentration range of their prepared probes is from 0 to 521 nM, which is sufficient to detect different concentrations of uranyl ions. At the same time, the probes were used in different real water samples for practical application evaluation, showing a promising future in environmental detection.

Fig.1 TEM images of CdTe-MPA QDs before (a) and after (b) reaction with uranyl ions. (Chen et al., 2018)Fig.1 TEM images of CdTe-MPA QDs before (a) and after (b) reaction with uranyl ions. (Chen et al., 2018)


Liu et al. demonstrated water-soluble cadmium telluride (CdTe) quantum dots (QDs) used as an anode interlayer in a solution-treated near-infrared (NIR) polymer photodetector (PD). Compared to poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), polymer PDs bound to CdTe QDs as an anode interlayer exhibit a 10-fold higher suppressed dark current density and similar photocurrent density, resulting in over 10-fold higher detection rates. In addition, the stability of the unencapsulated NIR polymer PDs was extended to 650 h after replacing PEDOT:PSS with CdTe QDs, which is more than 3 times longer than that of PEDOT:PSS as an anode interlayer.

Fig.2 Scheme of the polymer photodetector device architecture. (Liu et al., 2013)Fig.2 Scheme of the polymer photodetector device architecture. (Liu et al., 2013)

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  1. Chen X. , et al. Sensitive and selective fluorescence detection of aqueous uranyl ions using water-soluble CdTe quantum dots[J]. Journal of Radioanalytical & Nuclear Chemistry, 2018.
  2. Liu, X. , et al. Water-soluble CdTe quantum dots as an anode interlayer for solution-processed near infrared polymer photodetectors. Nanoscale, 2013, 5(24):12474-12479.
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