Stable magneto-fluorescent gadolinium-doped AgInS2 core quantum dots (QDs) with enhanced photoluminescence properties

May, Bambesiwe M.; Fakayode, Olayemi J.; Bambo, Mokae F.; Sidwaba, Unathi; Nxumalo, Edward N.; Mishra, Ajay Kumar

doi:10.1016/j.matlet.2021.130776

Cited by 6 publications

(8 citation statements)

References 10 publications

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“…The Gd-doped AgInS 2 QDs were synthesized with a 7:16 TGA: sodium citrate mole ratio suggesting that the surface functionality is dominated by carboxylate groups from citrate molecules and a few from the TGA molecules hence the materials are referred to as “citrate-capped Gd-doped AgInS 2 QDs”. At such high Gd loading the carboxylate groups on the AIS QD surface coordinate with Gd 3+ ions and passivates the surfaces, filling the defect sites and thus the stable fluorescence properties [ 16 ]. The elemental analysis ( Table 1 ) of the Gd-AIS QDs showed an obvious increase in the Gd concentration at increased Gd mole ratios while the slight decreases in Ag and In were attributed to possible cation-exchange occurring during the Gd doping when Gd diffuses into the AgInS 2 QDs lattice.…”

Section: Resultsmentioning

confidence: 99%

“…Gd-doped AIS QDs were prepared following our previous report [ 16 ]. Typically, 0.0453 g of Gd 2 O 3 (0.1248 mmol) was dissolved in 300 μL HCl under mild heat and made up to 10 mL with deionized water.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the preparation of the nanocomposites involved several steps for the synthesis and conjugation of the multiple components. Recently, we reported a one-pot synthesis of stable magneto-fluorescent citrate-capped Gd-doped AgInS 2 QDs at high Gd loading (up to 20 Gd mol ratio) with enhanced photoluminescence characteristics [ 16 ]. In this work, citrate-capped Gd-doped AgInS 2 (AIS) QDs were synthesized up to a Gd mole ratio of 30.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fluorescence sensing and adsorption kinetics of Gd-doped AgInS2 I-III-VI quantum dots – A case study of Ag+ ions interactions

May

Fakayode

Bambo

et al. 2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluorescence sensing and adsorption kinetics of Gd-doped AgInS2 I-III-VI quantum dots – A case study of Ag+ ions interactions

May

Fakayode

Bambo

et al. 2023

Heliyon

Self Cite

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“…Quantum dots (QDs) doped with gadolinium paramagnetic ions have been identified as promising materials for fluorescence and magnetic-field-driven aquatic applications. Some intensely fluorescent Gd-doped AgInS2 QDs were supposedly synthesized at Gd molar ratios of 18–20 [ 156 ]. The new materials showed improved PL characteristics at greater Gd loadings than state-of-the-art materials, which showed poor PL features at higher Gd loadings.…”

Section: Magento-fluorescent Nanobioprobe For Mrimentioning

confidence: 99%

Bioimaging Probes Based on Magneto-Fluorescent Nanoparticles

Ganguly

Margel

2023

Pharmaceutics

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Novel nanomaterials are of interest in biology, medicine, and imaging applications. Multimodal fluorescent-magnetic nanoparticles demand special attention because they have the potential to be employed as diagnostic and medication-delivery tools, which, in turn, might make it easier to diagnose and treat cancer, as well as a wide variety of other disorders. The most recent advancements in the development of magneto-fluorescent nanocomposites and their applications in the biomedical field are the primary focus of this review. We describe the most current developments in synthetic methodologies and methods for the fabrication of magneto-fluorescent nanocomposites. The primary applications of multimodal magneto-fluorescent nanoparticles in biomedicine, including biological imaging, cancer treatment, and drug administration, are covered in this article, and an overview of the future possibilities for these technologies is provided.

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“…The photoluminescence properties of QDs can be tuned accurately with sharp emission depending on their composition and size [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Furthermore, single QDs have a high surface-to-volume ratio catering to a significant number of surface trap states, which then act as de-excitation (non-radiative) centers for photo-generated charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals

et al. 2022

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Recently, quantum-dot-based core/shell structures have gained significance due to their optical, optoelectronic, and magnetic attributes. Controlling the fluorescence lifetime of QDs shells is imperative for various applications, including light-emitting diodes and single-photon sources. In this work, novel Cu-doped CdS/ZnS shell structures were developed to enhance the photoluminescence properties. The objective was to materialize the Cu-doped CdS/ZnS shells by the adaptation of a two-stage high-temperature doping technique. The developed nanostructures were examined with relevant characterization techniques such as transmission electron microscopy (TEM) and ultraviolet–visible (UV–vis) emission/absorption spectroscopy. Studying fluorescence, we witnessed a sharp emission peak at a wavelength of 440 nm and another emission peak at a wavelength of 620 nm, related to the fabricated Cu-doped CdS/ZnS core/shell QDs. Our experimental results revealed that Cu-doped ZnS shells adopted the crystal structure of CdS due to its larger bandgap. Consequently, this minimized lattice mismatch and offered better passivation to any surface defects, resulting in increased photoluminescence. Our developed core/shells are highly appropriate for the development of efficient light-emitting diodes.

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Stable magneto-fluorescent gadolinium-doped AgInS2 core quantum dots (QDs) with enhanced photoluminescence properties

Cited by 6 publications

References 10 publications

Fluorescence sensing and adsorption kinetics of Gd-doped AgInS2 I-III-VI quantum dots – A case study of Ag+ ions interactions

Fluorescence sensing and adsorption kinetics of Gd-doped AgInS2 I-III-VI quantum dots – A case study of Ag+ ions interactions

Bioimaging Probes Based on Magneto-Fluorescent Nanoparticles

Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals

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