In-situ synthesis of luminescent CdS quantum dots embedded in phosphate glass

Santos, Giulia Alves dos; Capelo, Renato Grigolon; Liu, Chao; Manzani, Danilo

doi:10.1016/j.jnoncrysol.2022.121599

Cited by 7 publications

(2 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to conventional organic fluorophores, QDs, specifically glutathione-stabilized CdTe-QDs, exhibit advantageous properties, including tunable emissions, photostability and high brightness [ 16 , 17 ]. These unique properties make different types of quantum dots highly desirable for certain biological applications and provide new possibilities for biological imaging and protein conjugations to detect polysaccharides [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Physico-Chemical Properties of CdTe/Glutathione Quantum Dots Obtained by Microwave Irradiation for Use in Monoclonal Antibody and Biomarker Testing

Ruiz-Robles,

Solís-Pomar,

Travieso Aguilar

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

In this report, we present the results on the physicochemical characterization of cadmium telluride quantum dots (QDs) stabilized with glutathione and prepared by optimizing the synthesis conditions. An excellent control of emissions and the composition of the nanocrystal surface for its potential application in monoclonal antibody and biomarker testing was achieved. Two samples (QDYellow, QDOrange, corresponding to their emission colors) were analyzed by dynamic light scattering (DLS), and their hydrodynamic sizes were 6.7 nm and 19.4 nm, respectively. Optical characterization by UV-vis absorbance spectroscopy showed excitonic peaks at 517 nm and 554 nm. Photoluminescence spectroscopy indicated that the samples have a maximum intensity emission at 570 and 606 nm, respectively, within the visible range from yellow to orange. Infrared spectroscopy showed vibrational modes corresponding to the functional groups OH-C-H, C-N, C=C, C-O, C-OH, and COOH, which allows for the formation of functionalized QDs for the manufacture of biomarkers. In addition, the hydrodynamic radius, zeta potential, and approximate molecular weight were determined by dynamic light scattering (DLS), electrophoretic light scattering (ELS), and static light scattering (SLS) techniques. Size dispersion and the structure of nanoparticles was obtained by Transmission Electron Microscopy (TEM) and by X-ray diffraction. In the same way, we calculated the concentration of Cd2+ ions expressed in mg/L by using the Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-OES). In addition to the characterization of the nanoparticles, the labeling of murine myeloid cells was carried out with both samples of quantum dots, where it was demonstrated that quantum dots can diffuse into these cells and connect mostly with the cell nucleus.

show abstract

Section: Introductionmentioning

confidence: 99%

Physico-Chemical Properties of CdTe/Glutathione Quantum Dots Obtained by Microwave Irradiation for Use in Monoclonal Antibody and Biomarker Testing

Ruiz-Robles,

Solís-Pomar,

Travieso Aguilar

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…In addition, one has also to consider the chemical incompatibility between the resin and the nanofillers, as the nanofillers tend to hinder the monomer cross-linking; therefore, they are mostly expelled from the polymeric network due to spinodal demixing, meaning that a high nanofiller concentration is required to ensure their presence in the devices and this is a quite expensive process, as most of the fillers are wasted away during the polymerization process and development . In the case of QDs and their tendency to cluster, − the sample may present a carpet of QD aggregates surrounding the polymeric object, jeopardizing any application at the nanoscale, since the background containing QD aggregates shows strong light emission that could be higher than the photoluminescence of the desired single-photon source …”

Section: Introductionmentioning

confidence: 99%

Quantum Dot Transfer from the Organic Phase to Acrylic Monomers for the Controlled Integration of Single-Photon Sources by Photopolymerization

Issa

Ritacco

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

This paper reports on a new strategy for obtaining homogeneous dispersion of grafted quantum dots (QDs) in a photopolymer matrix and their use for the integration of single-photon sources by two-photon polymerization (TPP) with nanoscale precision. The method is based on phase transfer of QDs from organic solvents to an acrylic matrix. The detailed protocol is described, and the corresponding mechanism is investigated and revealed. The phase transfer is done by ligand exchange through the introduction of mono-2-(methacryloyloxy) ethyl succinate (MES) that replaces oleic acid (OA). Infrared (IR) measurements show the replacement of OA on the QD surface by MES after ligand exchange. This allows QDs to move from the hexane phase to the pentaerythritol triacrylate (PETA) phase. The QDs that are homogeneously dispersed in the photopolymer without any clusterization do not show any significant broadening in their photoluminescence spectra even after more than 3 years. The ability of the hybrid photopolymer to create micro- and nanostructures by two-photon polymerization is demonstrated. The homogeneity of emission from 2D and 3D microstructures is confirmed by confocal photoluminescence microscopy. The fabrication and integration of a single-photon source in a spatially controlled manner by TPP is achieved and confirmed by auto-correlation measurements.

show abstract

Effect of surface defects on photoluminescence properties of CdSe quantum dots in glasses

Jiang

Manzani

et al. 2023

Applied Surface Science

View full text Add to dashboard Cite

In-situ synthesis of luminescent CdS quantum dots embedded in phosphate glass

Cited by 7 publications

References 38 publications

Physico-Chemical Properties of CdTe/Glutathione Quantum Dots Obtained by Microwave Irradiation for Use in Monoclonal Antibody and Biomarker Testing

Physico-Chemical Properties of CdTe/Glutathione Quantum Dots Obtained by Microwave Irradiation for Use in Monoclonal Antibody and Biomarker Testing

Quantum Dot Transfer from the Organic Phase to Acrylic Monomers for the Controlled Integration of Single-Photon Sources by Photopolymerization

Effect of surface defects on photoluminescence properties of CdSe quantum dots in glasses

Contact Info

Product

Resources

About