Studying the interaction between CdTe quantum dots and Nile blue by absorption, fluorescence and resonance Rayleigh scattering spectra

Peng, Juanjuan; Liu, Shaopu; Wang, Lei; He, Yonghong

doi:10.1016/j.saa.2010.02.021

Cited by 19 publications

(9 citation statements)

References 33 publications

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“…10). 22 Upon photoexcitation of a QD, the electrons from the valence band are excited to the conduction band. The excited electron and the oppositely charged "hole" attract one another.…”

Section: Characterization Of the Synthesized Gsh-capped Cdte Qdsmentioning

confidence: 99%

Detection of DNA using an “off-on” switch of a regenerating biosensor based on an electron transfer mechanism from glutathione-capped CdTe quantum dots to nile blue

Shen

Liu

Kong

et al. 2014

Analyst

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Although various strategies have been reported for double-stranded DNA (DNA) detection, development of a time-saving, specific, and regeneratable fluorescence sensing platform still remains a desired goal. In this study, we proposed a new DNA detection method that relies on an "off-on" switch of a regenerated fluorescence biosensor based on an electron transfer mechanism from glutathione (GSH)-capped CdTe quantum dots (QDs) to nile blue (NB). Initially, the high fluorescence of GSH-capped CdTe QDs could be effectively quenched by NB due to the binding of NB to the GSH on the surface of the QDs and the electron transfer from the photoexcited GSH-capped CdTe QDs to NB. Then, the high affinity of DNA to NB enabled the NB to be dissociated from the surface of GSH-capped CdTe QDs to form a more stable complex with DNA and suppress the electron transfer process between GSH-capped CdTe QDs and NB, thereby restoring the fluorescence of NB surface modified GSH-capped CdTe QDs (QDs-NB). In addition, we have testified the regenerability of the proposed DNA senor. The corresponding result shows that this DNA sensor is stable for two reuses. This fluorescence "off-on" signal was sensitive to the concentration of DNA in the range from 0.0092 to 25.0 μg mL(-1) with a good correlation coefficient of 0.9989, and the detection limit (3σ/S) was 2.78 ng mL(-1). To further investigate for perfect analysis performance, the developed biosensor was applied for the determination of DNA in human fresh serum samples with satisfactory results.

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“…10). 22 Upon photoexcitation of a QD, the electrons from the valence band are excited to the conduction band. The excited electron and the oppositely charged "hole" attract one another.…”

Section: Characterization Of the Synthesized Gsh-capped Cdte Qdsmentioning

confidence: 99%

Detection of DNA using an “off-on” switch of a regenerating biosensor based on an electron transfer mechanism from glutathione-capped CdTe quantum dots to nile blue

Shen

Liu

Kong

et al. 2014

Analyst

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“…1 The metal chalcogenides such as ZnS, CdS, CdSe, CdTe, PbSe and PbTe, have been extensively studied and their variable direct band gap and resultant tuneable photoluminescence has led to numerous applications including photodynamic therapy, imaging and sensing applications. [2][3][4][5][6][7][8][9][10][11] Of particular interest is the use of quantum dots as acceptor/donor components for the conversion of light energy into electricity in a photovoltaic device. [12][13][14][15][16] A significant obstacle to the development of high-performance photovoltaic cells is the effective separation of photogenerated electron-hole pairs and the transfer of the electrons to the electrode.…”

Section: Introductionmentioning

confidence: 99%

Photophysical studies of CdTe quantum dots in the presence of a zinc cationic porphyrin

et al. 2012

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The photophysical properties of 2.3 nm thioglycolic acid (TGA) coated CdTe quantum dots (QDs) prepared by a reflux method have been studied in the presence of a cationic meso-tetrakis(4-N-methylpyridyl) zinc porphyrin (ZnTMPyP4). Addition of the CdTe QDs to porphyrin in H 2 O results in a marked red-shift and hypochromism in the porphyrin absorption spectrum, indicative of a non-covalent binding interaction with the QD surface. Low equivalents of the quantum dot were required for complete quenching of the porphyrin fluorescence revealing that one quantum dot 10 may quench more than one porphyrin. Similarly addition of porphyrin to the quantum dot provided evidence for very efficient quenching of the CdTe photoluminescence, suggesting the formation of CdTe-porphyrin aggregates. Definitive evidence for such aggregates was gathered using small angle X-ray spectroscopy (SAXS). Ultrafast transient absorption data are consistent with very rapid photoinduced electron transfer (1.3 ps) and the resultant formation of a long-lived porphyrin species.

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“…Based on the strategy, we have investigated the PET reactions of mesotetrakis (4-sulfonatophenyl) porphyrin and eosin with anthraquinone dyes [31,32]. Similar to the above, the interaction studies between thioglycolic acid (TGA) capped CdTe QDs and dyes such as methylene blue and nile blue have also been reported [33,34]. Very recently we have investigated the PET reactions between QDs and porphyrins [35].…”

Section: Introductionmentioning

confidence: 91%

Photoinduced interaction between MPA capped CdTe QDs and certain anthraquinone dyes

Jagadeeswari

Jhonsi

Kathiravan

et al. 2011

Journal of Luminescence

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Studying the interaction between CdTe quantum dots and Nile blue by absorption, fluorescence and resonance Rayleigh scattering spectra

Cited by 19 publications

References 33 publications

Detection of DNA using an “off-on” switch of a regenerating biosensor based on an electron transfer mechanism from glutathione-capped CdTe quantum dots to nile blue

Detection of DNA using an “off-on” switch of a regenerating biosensor based on an electron transfer mechanism from glutathione-capped CdTe quantum dots to nile blue

Photophysical studies of CdTe quantum dots in the presence of a zinc cationic porphyrin

Photoinduced interaction between MPA capped CdTe QDs and certain anthraquinone dyes

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