Microwave-Assisted Synthesis of Water-Dispersed CdTe Nanocrystals with High Luminescent Efficiency and Narrow Size Distribution

Abstract

Water-dispersed nanocrystals with high photoluminescence quantum yield (PLQY) and narrow size distribution are desirable for a variety of bioapplications. In this report, we present a facile method assisted by microwave irradiation for rapidly synthesizing high-quality CdTe nanocrystals in aqueous phase. The PLQY of CdTe nanocrystals prepared in very short time (15 min) reaches as high as 82%, and the fwhm value is merely 27 nm meanwhile. Moreover, the PLQY is increased to a remarkable 98% after further amelioration through the illumination method. The key synthesis parameters (molar ratio of reagents, pH values, reaction temperature, and time) are fully discussed, and the optimum conditions are illuminated in this paper. In addition, the mechanism about microwave irradiation improving the quality of nanocrystals is discussed as well.

Water-soluble multicolored fluorescent CdTe quantum dots: Synthesis and application for fingerprint developing

“…However, QYs of CdTe QDs can be improved through choosing appropriate ligand molecules, such as thioglycolic acid (TGA) and mercaptopropionic acid (MPA), and by optimizing other reaction conditions such as the concentration ratio between capping ligands and cadmium ions. Recently, several methods for synthesizing aqueous CdTe QDs, such as illumination [18], microwave irradiation [19], ultrasound [20] and hydrothermal route [13] have also been developed. Although these techniques are efficient, they are relatively complicated and additional high-cost instruments are required.…”

Dual-labelled immunoassay with goldmag nanoparticles and quantum dots for quantification of casein in milk

“…Moreover, due to gold nanoparticles on the surface of GMNP, the process of coupling antibody on the surface of GMNP was simple and convenient. Meanwhile, CdTe quantum dots (QDs) (semiconductor nanocrystals) exhibit several unique optical properties such as high fluorescence intensity, narrow emission line, wide stimulation spectral line, continuously adjustable emission wavelength along with particle size and resistance to photobleaching (He et al, 2007;Wang et al, 2016;Zhang, Long, & Zheng, 2016), which can be exploited in optoelectronics, biomedicine and food safety detection. In this paper, GMNP bound to the monoclonal antibody (McAb) was used as capture probe, while CdTe QDs labelled with the polyclonal antibody (PcAb) was employed as detection probe.…”

Investigation of the Photoluminescence Properties and Nonlinear Optical Responses of CdTe/CdS Core/Shell Quantum Dots

“…The molar ratio between the Cd:TGA:Te was 1:2.4:0.5. [11,12] Prepared solution was heated at 100 • C in silicon oil bath. After synthesis of CdTe core, CdTe QDs were separated from solution by adding methanol and 3 times centrifugation in 5000 RPM for 5 min, the precipitated QDs were dispersed in 3 mL of D.I.…”