Perovskite Quantum Dots Supplier - Alfa Chemistry

Water-phase CdTe (carboxyl) Quantum Dots

Water-phase CdTe (carboxyl) Quantum Dots


Product Introduction

Alfa Chemistry offers high quality water-phase CdTe (carboxyl) quantum dots encapsulated by carboxyl groups, which makes them soluble in water, resulting in aqueous solutions. Alfa Chemistry offers customers suitable water-phase CdTe (carboxyl) quantum dots in wavelengths from 520nm - 800nm. If you need a quantum dot that is not on our list, please feel free to contact us and we can customize the relevant product to meet your requirements.


Fluorescent Nanosensor Detection

In this work, Pooja et al. investigated the possibility of using COOH-functionalized CdTe quantum dots (QDs) as fluorescent nanosensors for the detection of some environmentally harmful metal ions (Cr3+, Pb2+, Cu2+, Zn2+ and Co2+) in the aqueous phase. COOH-CdTe QDs were prepared in aqueous media and characterized by UV-Vis, photoluminescence and FTIR spectroscopy for characterization. The optical response of CdTe nanosensors was observed to be time- and temperature-dependent. A strong "off" fluorescence response of CdTe was observed in the presence of all metal ions (Xn+). CdTe showed its effective sensing ability for Pb2+, Cr3+ and Cu2+ ions, as evidenced by the validation of its low limit of detection (LOD). Furthermore, the strong presence of F-F0/F0 proves that CdTe QDs have better sensing ability for Cr3+, Pb2+ and Cu2+ ions, far better than the industrially available fluorescent sensors.

Fig.1 Sensitive detection schematic of functionalized CdTe fluorescence nanosensor. (Pooja et al., 2020)Fig.1 Sensitive detection schematic of functionalized CdTe fluorescence nanosensor. (Pooja et al., 2020)

Fluorescent Probes

CdTe quantum dots were modified by N-acetyl-L-cysteine (NALC) as novel fluorescent probes and were successfully used for the determination of L-penicillamine. The fluorescence of CdTe QDs decreased significantly in the presence of copper ions (Cu2+) due to the binding of Cu2+ to NALC on the surface of CdTe QDs, but the fluorescence of the modified CdTe QDs was effectively recovered immediately after the addition of L-PA. The experimental results showed that the pH value of the buffer solution and the concentration of Cu2+ affected the fluorescence intensity after the addition of L-PA. In this work, a new, simple and rapid method for the determination of L-PA has been established, and its potential has been demonstrated in human serum samples and environmental samples with satisfactory results.

Fig.2 TEM image of the NALC-CdTe QDs. (Huang et al., 2018)Fig.2 TEM image of the NALC-CdTe QDs. (Huang et al., 2018)

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  1. Pooja, and P. Chowdhury . Functionalized CdTe Fluorescence Nanosensor for the Sensitive Detection of Water Borne Environmentally Hazardous Metal Ions[J]. Optical Materials, 2020.
  2. Huang, Y. , et al. Novel competitive-displacement fluorescent assay for L-Penicillamine based on reaction between target and N-acetyl-L-cysteine-capped CdTe quantum dots for copper ion[J]. Analytical Methods, 2018:10.1039.C8AY00515J.
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