A simple chemical etching strategy to generate “ion-imprinted” sites on the surface of quantum dots for selective fluorescence turn-on detecting of metal ions

Wu, Peng; Yan, Xiu‐Ping

doi:10.1039/c0cc01762k

Cited by 72 publications

(49 citation statements)

References 30 publications

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“…A triexponential luminescence decay ( Figure S2) and a decrease of luminescence lifetime with increasing Se(IV) were observed ( Table S1), indicating that the mechanism involved in the luminescence quenching is dynamic, and this agrees with previous works. 22,47 On the basis of the above discussions and the previous works, 22,45 we assumed that the binding between Cd in Cd−thiol complex and Se in H 2 Se on the surface of CdTe QDs might cause the increase of surface defects thus facilitate the nonradiative e − /h + recombination in the QD surface, which would eventually result in the fluorescence quenching of the CdTe QDs. Effect of HG Conditions.…”

Section: ■ Results and Discussionmentioning

confidence: 90%

“…The structures of these clusters are shown in Figure 3, similar to previous studies. 43,44 The configurations and adsorption energies are also summarized in Figure 3 Previous studies reported 45,46 that a Cd−thiol complex surface layer was created as a shell around the CdTe QDs core to occupy the surface sites and to passivate the QDs. In addition, the binding force of Cd−Se bond was much greater than that of Cd-thiol.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…It was reported that QDs usually exhibit size quantization effect, resulting in a red shift of the corresponding fluorescence emission spectral peak with increasing their size. 45 In addition, the size may affect the QDs distribution on the paper and influence the sensitivity of the proposed method. Therefore, the effect of the CdTe QDs size on the QDs distribution and sensitivity was investigated by using the CdTe QDs with particle size in the range of 2−4 nm.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Hydride Generation for Headspace Solid-Phase Extraction with CdTe Quantum Dots Immobilized on Paper for Sensitive Visual Detection of Selenium

Huang

Zhu

et al. 2015

Anal. Chem.

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Section: ■ Results and Discussionmentioning

confidence: 90%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Hydride Generation for Headspace Solid-Phase Extraction with CdTe Quantum Dots Immobilized on Paper for Sensitive Visual Detection of Selenium

Huang

Zhu

et al. 2015

Anal. Chem.

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“…An alternative approach to design uorescent sensors is based on the chemical etching effect, which originates from an etching reagent generating specic recognition sites on the surface of NPs for the selective turn-on detection of an absorber in the detection system. 35 This method can achieve enhanced sensitivity compared to other methods. However, CdTe NPs-based uorescent sensors using dithizone as the etching reagent for the simple detection of cadmium ion by turning the uorescence on have not been developed.…”

mentioning

confidence: 99%

Dithizone-etched CdTe nanoparticles-based fluorescence sensor for the off–on detection of cadmium ion in aqueous media

Liao

Ding

et al. 2017

RSC Adv.

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In the present study, a new fluorescence probe based on dithizone-etched CdTe nanoparticles was designed for the sensitive and selective detection of cadmium ions in environmental samples via a reversible off-on fluorescence mode. At first, the initial bright fluorescence of L-cysteine-capped CdTe NPs could be effectively quenched in the presence of dithizone (DZ) due to the chemical etching effect, which results from the breaking of Cd-thiol layers by DZ, thus leading to a decrease in the NPs surface passivation. Then, upon the addition of Cd 2+ , the weak fluorescence of the CdTe NPs-DZ system gradually recovered, owing to the occurrence of Cd-thiol passivation layers on the surface of the NPs.Under optimal conditions, a good linear relationship was obtained in the range from 0.4 mM to 15.4 mM for Cd 2+ , with a detection limit of 0.13 mM. In addition, this CdTe NPs-based nanosensor presents remarkable selectivity for Cd 2+ over other metal ions and was successfully applied for the detection of Cd 2+ in real water samples with satisfactory results, demonstrating its potential application for the determination of Cd 2+ in the environment.

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“…62 The observation of fluorescence enhancement is less frequent, and in these cases the mechanism ascribed for the observed increase in quantum yield is the passivation of trap states or defects on the surface of the QDs. 63,64 In any case, the changes induced by the direct interaction between the metal ions and the QD's surface, unmodified or functionalized with a given ligand, have allowed the sensitive detection of several toxic metal ions.…”

Section: Quantum Dot As Passive Fluorescent Labelsmentioning

confidence: 99%

Analytical strategies based on quantum dots for heavy metal ions detection

Vázquez‐González

Carrillo‐Carrión

2014

J. Biomed. Opt

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Abstract. Heavy metal contamination is one of the major concerns to human health because these substances are toxic and retained by the ecological system. Therefore, in recent years, there has been a pressing need for fast and reliable methods for the analysis of heavy metal ions in environmental and biological samples. Quantum dots (QDs) have facilitated the development of sensitive sensors over the past decade, due to their unique photophysical properties, versatile surface chemistry and ligand binding ability, and the possibility of the encapsulation in different materials or attachment to different functional materials, while retaining their native luminescence property. This paper comments on different sensing strategies with QD for the most toxic heavy metal ions (i.e., cadmium, Cd 2þ ; mercury, Hg 2þ ; and lead, Pb 2þ ). Finally, the challenges and outlook for the QD-based sensors for heavy metals ions are discussed.

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A simple chemical etching strategy to generate “ion-imprinted” sites on the surface of quantum dots for selective fluorescence turn-on detecting of metal ions

Abstract: A simple general chemical etching strategy is developed to generate "ion-imprinted" sites on the surface of QDs for subsequent selective signal turn-on detection of metal ions.

Cited by 72 publications

References 30 publications

Hydride Generation for Headspace Solid-Phase Extraction with CdTe Quantum Dots Immobilized on Paper for Sensitive Visual Detection of Selenium

Hydride Generation for Headspace Solid-Phase Extraction with CdTe Quantum Dots Immobilized on Paper for Sensitive Visual Detection of Selenium

Dithizone-etched CdTe nanoparticles-based fluorescence sensor for the off–on detection of cadmium ion in aqueous media

Analytical strategies based on quantum dots for heavy metal ions detection

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