Rapid Synthesis of Highly Luminescent CdTe Nanocrystals in the Aqueous Phase by Microwave Irradiation with Controllable Temperature.

Li, Liang; Hu, Qian; Ren, Jicun

doi:10.1002/chin.200515012

Cited by 32 publications

(48 citation statements)

References 1 publication

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“…Higher temperature leads to an increase in the crystallinity of QDs accompanied by an enhancement of QY [20]. On the other hand, a very high temperature may cause decomposition of the stabilizer [21], resultantly in a decrease in the QY. To obtain high quality QDs, the reaction temperature has to be optimized to realize an equilibrium of the attachment/detachment rate of the cadmium thiol complexes around the QDs surface [27].…”

Section: Effect Of Synthesis Parameters On the Qy Of Cdte Qdsmentioning

confidence: 99%

One-pot synthesis of highly luminescent CdTe quantum dots by microwave irradiation reduction and their Hg2+-sensitive properties

2009

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IntroductionQuantum dots (QDs), due to their variety of size-and shape-dependent optical and electrical properties [1,2], have been attracting extensive attention for numerous applications such as in biological labels, photovoltaic devices, and optoelectronic devices [3 5]. In particular, they are very attractive as QD-based optical sensors for detecting biomolecules, small molecules, and cations or anions due to their high fluorescence quantum yields, good photostability, and negligible photobleaching in comparison with dyes [6 10]. CdTe is an important semiconductor material and CdTe QDs show increasing promise due to their large exciton Bohr radius (7.3 nm) and narrow ABSTRACTA facile one-pot microwave irradiation reduction route has been developed for the synthesis of highly luminescent CdTe quantum dots using Na 2 TeO 3 as the Te source in an aqueous environment. The synthesis parameters of this simple and rapid approach, including the reaction temperature and time, the pH of the reaction solution and the molar ratio of the 3-mercaptopropionic acid (MPA) stabilizer to Cd 2+ , have considerable infl uence on the particle size and photoluminescence quantum yield of the CdTe quantum dots. The photoluminescence quantum yield of CdTe quantum dots prepared using relatively short reaction times (10 40 min) reached 40% 60% (emission peaks at 550 640 nm). Furthermore, the resulting products could be used as fl uorescent probes to detect Hg 2+ ions in aqueous media. The response was linearly proportional to the concentration of Hg 2+ ion in the range 8.0×10 9 mol/L to 2.0×10 6 mol/L with a detection limit of 2.7×10 9 mol/L.

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Section: Effect Of Synthesis Parameters On the Qy Of Cdte Qdsmentioning

confidence: 99%

One-pot synthesis of highly luminescent CdTe quantum dots by microwave irradiation reduction and their Hg2+-sensitive properties

2009

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“…[18]. Three negatively charged CdTe quantum dots samples with different sizes, whose photoluminescence emission maxima at 522nm, 597nm, and 650nm, were used in this study.…”

Section: Methodsmentioning

confidence: 99%

Forster Resonance Energy Transfer in a Hybrid System of CdTe Quantum dots-RhB

Wei¹,

Zhou²,

He³

et al. 2016

Proceedings of the International Symposium on Mechanical Engineering and Material Science

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Abstract. The forster resonance energy transfer (FRET) between different CdTe QDs and RhB were investigated by steady-state and femtosecond time-resolved photoluminescence spectra technique. Through the measurements on three different CdTe sample solutions, it was found that the FRET efficiency is proportional to the spectral overlap degree of CdTe QDs' emission and RhB's absorption. And the FRET efficiency was found to increase with the increase of the RhB's concentration, while the concentration increase to more than 4.5×10-5 mol/L, the transfer efficiency decreases. The FRET efficiency can reach to 32.6% when RhB concentration is 4.5×10-5 mol/L. With the wide use of FRET in biomolecular interaction analysis and cell physiology, the CdTe QDs-RhB hybrid systems could be a promising candidate for fluorescent probe and photodynamic therapy.

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“…Primers were synthesised from Sun Biotech company, and their sequences were presented in Table 1. All other reagents, including molecular weight markers DL2000 (2000, 1000, 750, 500, 250 and NaHTe solution in the presence of mercaptopropionic acid as a stabiliser according to the approach described by Li et al [42] and Zhang [43]. Emission spectra were recorded using a Varian Cary spectrometer, and absorption spectra were obtained by a Lambda 20 UV-visible spectrophotometer (PerkinElmer).…”

Section: Methodsmentioning

confidence: 99%

Quantum dots trigger hot-start effects for pfu-based polymerase chain reaction

Sang

Yang

Wang

et al. 2013

Journal of Experimental Nanoscience

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Hot-start (HS) effects were investigated in pfu-based polymerase chain reaction (PCR), when water-soluble CdTe quantum dots (QDs) were introduced in the PCR system. The HS effects were demonstrated by the higher amplicon yields and excellent suppression of non-specific amplification after pre-incubation of PCR mix with QDs between 35 C and 56 C. DNA targets were well amplified even after PCR mixture was pre-incubated 1 h at 50 C. Importantly, the effects of QDs nanoparticles could be reversed by increasing the pfu polymerase concentration, suggesting that there was an interaction between QDs and pfu DNA polymerase. Moreover, control experiment indicated that HS effect is not primarily due to the reduced pfu polymerase concentration resulted from the above interaction. Fluorescence correlation spectroscopy (FCS), a single molecule detection method, was used to investigate the possible mechanism of HS PCR with QDs. Preliminary FCS results suggested that CdTe QDs may directly interact with pfu DNA polymerase, rather than other components in the PCR system. Furthermore, results demonstrated that the interaction between QDs and pfu resulted in a reduction in pfu polymerase concentration. This study provided a good start to investigate potential implications of QDs in other key molecular biology techniques.

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Rapid Synthesis of Highly Luminescent CdTe Nanocrystals in the Aqueous Phase by Microwave Irradiation with Controllable Temperature.

Cited by 32 publications

References 1 publication

One-pot synthesis of highly luminescent CdTe quantum dots by microwave irradiation reduction and their Hg2+-sensitive properties

One-pot synthesis of highly luminescent CdTe quantum dots by microwave irradiation reduction and their Hg2+-sensitive properties

Forster Resonance Energy Transfer in a Hybrid System of CdTe Quantum dots-RhB

Quantum dots trigger hot-start effects for pfu-based polymerase chain reaction

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