Analytical strategies based on quantum dots for heavy metal ions detection

Vázquez‐González, Margarita; Carrillo‐Carrión, Carolina

doi:10.1117/1.jbo.19.10.101503

Cited by 81 publications

(37 citation statements)

References 88 publications

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“…Well-dispersed semiconductor nanocrystals called quantum dots have been revolutionary in the development of fluorescent probes for metal ion sensing [175] and imaging [176-178] due to their unique optical properties including broad absorption, size- and component-tunable emission, as well as high photo- and chemical stability and high quantum yield [179-182] in comparison to traditional organic dyes. The synthesis, surface modification, characterization, and application of QDs in sensing and imaging have been well summarized previously [183].…”

Section: Semiconductor Nanoparticle-based Fluorescent Nanoprobes Fmentioning

confidence: 99%

Fluorescent nanoprobes for sensing and imaging of metal ions: Recent advances and future perspectives

et al. 2016

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Summary Recent advances in nanoscale science and technology have generated nanomaterials with unique optical properties. Over the past decade, numerous fluorescent nanoprobes have been developed for highly sensitive and selective sensing and imaging of metal ions, both in vitro and in vivo. In this review, we provide an overview of the recent development of the design and optical properties of the different classes of fluorescent nanoprobes based on noble metal nanomaterials, upconversion nanoparticles, semiconductor quantum dots, and carbon-based nanomaterials. We further detail their application in the detection and quantification of metal ions for environmental monitoring, food safety, medical diagnostics, as well as their use in biomedical imaging in living cells and animals.

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Section: Semiconductor Nanoparticle-based Fluorescent Nanoprobes Fmentioning

confidence: 99%

Fluorescent nanoprobes for sensing and imaging of metal ions: Recent advances and future perspectives

et al. 2016

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“…Fluorescent AuNPs could be utilized in sensors for the purpose of heavy metal detection, controlling the growth of pathogens, imaging, etc. [23][24][25][26][27][28]. Some methods have already been developed to prepare fluorescent AuNPs, such as reduction of gold precursor with NaBH 4 in the presence of 11-mercaptoundecanoic acid in toxic organic solvent, reduction of gold precursor with biomolecules like bovine serum albumin (BSA) and etching pre-synthesized AuNPs with hyperbranched and multivalent polymers [23,29,30].…”

Section: Structurementioning

confidence: 99%

Size-controlled preparation of fluorescent gold nanoparticles using pamoic acid

et al. 2015

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We previously showed that pamoic acid (PA) could be utilized as a reducing and capping reagent for preparing monodispersed gold nanoparticles (AuNPs) with diameters of 10.8 nm. Here, we show that the size of these PA-capped AuNPs can be varied in a controlled manner by changing the pH used in the preparation process. By changing the added amount of NaOH in the PA solution before mixing with HAuCl 4 , several types of AuNPs were prepared at different pH values. The absorption spectra showed a red shift of the characteristic peak of the AuNPs with decreasing pH, indicating the formation of larger AuNPs. The TEM results confirmed this relationship between AuNP size and pH, and the zeta potentials indicated that the AuNPs capped with PA were more stable than the AuNPs prepared by citrate reduction method. Furthermore, the PA-capped AuNPs showed much higher fluorescence intensities than those of citrate-capped AuNPs, which is due to the fluorescence of PA. The sizes of PA-capped spherical AuNPs could also be controlled by a seed-mediated growth approach. However, the original PAcapped AuNPs, with diameters of 10.8 nm, exhibited the highest fluorescence intensities among the various types of PA-capped AuNPs that were grown. In addition to conferring fluorescence properties to the AuNPs, the capping by PA also provided the nanoparticles with carboxylate groups.

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“…An ideal sensor should provide good sensitivity, high selectivity towards the target analyte, mathematical relationship of signal output to the amount of analyte, fast response time, good signal-to-noise ratio and longterm stability [7]. A variety of sensors have been developed, and these include DNAzymes sensors, optical sensors, electrochemical, colorimetric and fluorescent sensors [1][2][3][4][5][6][7][8][9][10] just to mention a few. This chapter aims to introduce the reader to the use of quantum dots (QDs) as metal ion sensors.…”

Section: Introductionmentioning

confidence: 99%

Mn-Doped ZnSe Quantum Dots as Fluorimetric Mercury Sensor

Parani¹,

Tsolekile²,

May³

et al. 2018

Nonmagnetic and Magnetic Quantum Dots

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Quantum dots (QDs), because of their exciting optical properties, have been explored as alternative fluorescent sensors to conventional organic fluorophores which are routinely employed for the detection of various analytes via fluorometry. QD probes can detect toxic metal ions, anions, organic molecules with good selectivity and sensitivity. This chapter investigates the synthesis of Mn-doped ZnSe QDs using nucleation-doping strategy. The as-synthesized QDs were characterized by various analytical tools such as ultravioletvisible (UV-vis) absorption, photoluminescence (PL) spectroscopy, X-ray diffractometry (XRD) and transmission electron microscopy (TEM). It was found that Mn doping of QDs significantly increases the PL intensity. The PL of the resulting QDs was examined in the presence of different metal ions to check its selective response. Among the various metal . Thus, the present Mn-doped ZnSe QDs represent a simple, non-toxic fluorescent probe for the qualitative and quantitative detection of mercury ions in aqueous samples.

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Analytical strategies based on quantum dots for heavy metal ions detection

Cited by 81 publications

References 88 publications

Fluorescent nanoprobes for sensing and imaging of metal ions: Recent advances and future perspectives

Fluorescent nanoprobes for sensing and imaging of metal ions: Recent advances and future perspectives

Size-controlled preparation of fluorescent gold nanoparticles using pamoic acid

Mn-Doped ZnSe Quantum Dots as Fluorimetric Mercury Sensor

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