Efficient Hg and Ag ion detection with luminescent PbS quantum dots grown in poly vinyl alcohol and capped with mercaptoethanol

Pendyala, Naresh Babu; Rao, K. S. R. Koteswara

doi:10.1016/j.colsurfa.2009.01.013

Cited by 30 publications

(13 citation statements)

References 30 publications

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“…The PL quenching and enhancement of CdTe nanorods in the presence of different divalent ions can be due to the modification of surface states or the atoms and molecules located near the surface because of carrier transfer. If the carriers are transferred from the rods to the surrounding ions, the PL intensity decreases or else, if the carrier transfer is in the opposite direction, there is enhancement in PL intensity [25].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Luminescent CdTe Nanorods on Anodized Aluminum Oxide Template and Their Utility in Divalent Heavy Metal Ion Sensing

Gyanan¹,

Khatei²

2014

SNL

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A simple one-pot hydrothermal method to grow luminescent CdTe nanorods on porous anodized aluminum oxide (AAO) template is described. These CdTe nanorods on the AAO template were further applied as an optical probe to detect divalent heavy metal ions such as Hg, Pb, Mg and Zn, by examining its photoluminescence (PL) responses. The presence of Pb and Hg ions quenched the photoluminescence (PL) of the CdTe nanorods where as Zn and Mg ions enhanced it with the effect of red shift in the peak position respectively. These PL enhancements/quenching of the nanorods after exposing to the divalent ions were explained on the basis of the active surface related recombination, which depends on the direction of carrier transfer mechanism i.e. from nanorods to the surface adsorbed metal ions or vice-versa and is attributed to the alignment of bands thus formed. The luminescent CdTe nanorods grown on AAO template was found to be effective in sensing metal ions (Pb, Hg, Zn and Mg) up to a micro-molar concentration.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Luminescent CdTe Nanorods on Anodized Aluminum Oxide Template and Their Utility in Divalent Heavy Metal Ion Sensing

Gyanan¹,

Khatei²

2014

SNL

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“…PbS quantum dots capped with mercaptoethanol were synthesized in polyvinyl alcohol and used to investigate their photoluminescence response to various ions. 42 The enhancement in the PL intensity was observed with specific ions, namely Zn 2þ , Cd 2þ , Hg 2þ , and Ag þ . Among these four ions, the PL response to Hg 2þ even at submicromolar concentrations was quite high, compared to others.…”

Section: Quantum Dot As Passive Fluorescent Labelsmentioning

confidence: 94%

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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“…Organic compounds and polymers present in reaction mixture play an important stabilizing role by providing the preparation of nanoscale particles and preventing their growth and aggregation. The examples of such organic compounds are oleyamine, polyvinylacetate, polyvinylpyrrolidone (PVP), polyvinyl alcohol, and others.…”

Section: Introductionmentioning

confidence: 99%

“…Optical and luminescent properties of PbS QDs suspensions in different solvents and prepared by different methods has been investigated in literature . The main physical mechanisms which determine these properties of PbS QDs suspensions are related to quantum confinement effect and the processes of energy transfer.…”

Section: Introductionmentioning

confidence: 99%

Some features of luminescent properties of PbS suspensions, stabilized by high‐molecular polyvinylpyrrolidone

Багров

Белоусова²,

Evstropiev³

et al. 2015

Polymers for Advanced Techs

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The results of the investigations of optical and luminescent properties of PbS suspensions stabilized by highmolecular polyvinylpyrrolidone are described. Suspensions prepared by liquid colloidal method from sodium sulfide and lead nitrate demonstrate strong luminescence in near infrared spectral range at the excitation by visual light with different wavelengths. It was proposed that Förster resonant energy transfer plays the important role in luminescence properties of closed packed PbS particles. The model, which describes the observed luminescent properties of the suspensions PbS-stabilized high-molecular polymer, is proposed. The combination of very wide spectral range of excitation of the luminescence with rather narrow range of light radiation in near infrared spectral range determine wide perspectives of the materials in solar luminescent concentrators and photodetectors.

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Efficient Hg and Ag ion detection with luminescent PbS quantum dots grown in poly vinyl alcohol and capped with mercaptoethanol

Cited by 30 publications

References 30 publications

Synthesis of Luminescent CdTe Nanorods on Anodized Aluminum Oxide Template and Their Utility in Divalent Heavy Metal Ion Sensing

Synthesis of Luminescent CdTe Nanorods on Anodized Aluminum Oxide Template and Their Utility in Divalent Heavy Metal Ion Sensing

Analytical strategies based on quantum dots for heavy metal ions detection

Some features of luminescent properties of PbS suspensions, stabilized by high‐molecular polyvinylpyrrolidone

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