Facile green synthesis of ZnInS quantum dots: temporal evolution of their optical properties and cell viability against normal and cancerous cells

Zikalala, Nkosingiphile; Parani, Sundararajan; Tsolekile, Ncediwe; Oluwafemi, Oluwatobi S.

doi:10.1039/d0tc02098b

Cited by 25 publications

(14 citation statements)

References 32 publications

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“…This illustrates that a coordinate bond is formed between the metal cations present at the surface of QDs and the sulfur atom that comes from the thiol group (S−H) of MAA by losing a proton. 42,43 The weak IR vibrational peaks in the region of 500−600 cm −1 are attributed to the metal−sulfur bond vibrations (561 cm −1 ). 44 To further confirm the synthesis of MAA-functionalized CCS QDs, EDX, TEM, and HRTEM analyses are performed.…”

Section: Resultsmentioning

confidence: 99%

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary Cu_xCd_1–xS Quantum Dots

et al. 2022

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Quantum dots (QDs) are semiconducting nanocrystals that exhibit size- and composition-dependent optical and electronic properties. Recently, Cu-based II–VI ternary Cu x Cd 1– x S (CCS) QDs have emerged as a promising class of QDs as compared to their binary counterparts (CuS and CdS). Herein, a series of ternary CCS QDs are synthesized by changing the molar concentration of Cu 2+ ions only keeping the 1:1 ratio of the stoichiometric mixture of Cd 2+ and S 2– . These CCS QDs are attached to 2-phenylbenzimidazole-5-sulfonic acid (PBSA), an eminent UV-B filter widely used in many commercial sunscreen products to avoid skin erythema and DNA mutagenic photolesions. The photoinduced Förster resonance energy transfer (FRET) is investigated from PBSA to CCS QDs as a function of Cu concentration in CCS QDs using the steady-state photoluminescence and time-resolved photoluminescence measurements. A 2-fold increase in the magnitude of non-radiative energy transfer rate ( K T ( r ) ) is observed as the molar concentration of Cu in CCS QDs increases from 2 to 10 mM. Our findings suggest that in PBSA-CCS QD dyads, the FRET occurrence from PBSA to QDs is dictated by the dynamic mode of photoluminescence (PL) quenching. The bimolecular PL quenching rate constants ( k q ) estimated by Stern–Volmer’s plots for PBSA-CCS QD dyads are of the order of 10 10 M –1 s –1 , which signifies that in the PBSA-CCS QD dyad FRET system, the process of PL quenching is entirely diffusion-controlled.

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Section: Resultsmentioning

confidence: 99%

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary Cu_xCd_1–xS Quantum Dots

et al. 2022

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“…Nano-sized ZnInS materials have been envisioned to be a promising replacement of the toxic CdS. [55] Meng et al prepared NiS/Zn 3 In 2 S 6 (NiS/ZIS) hierarchical architecture by one-step hydrothermal method, which could catalyze HMF conversion into DFF with simultaneous hydrogen generation. The selectivity towards DFF production was as high as 94.1 % due to the suitable valence band edge potential (Figure 13a).…”

Section: Heterogeneous Photocatalystsmentioning

confidence: 99%

Recent Advances in Photocatalytic Oxidation of 5‐Hydroxymethylfurfural

2021

ChemPhotoChem

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Conversion of biomass-derived platform compounds into valueadded chemicals will reduced the current dependence on carbon resources from fossil reserves. In recent years, catalytic oxidation of 5-hydroxymethylfurfural (HMF) has received extensive attention due to the widespread application of 2,5diformylfuran (DFF) and 2,5-furandicarboxylic acid (FDCA). A photocatalyst system is a cost-effective way of O 2 utilization as a green chemical oxidant for HMF oxidation. Moreover, replacement of the kinetically sluggish water oxidation with HMF oxidation can promote hydrogen production during photo water splitting. This review provides a concise and up-to-date overview of photocatalyst systems for HMF oxidation, giving special attention to catalyst material design, product selectivity, mechanistic insight, and catalyst stability. The chemistry discussed in this review is an attempt to provide inspiration for researchers to develop efficient photocatalyst systems for solar biorefinery.

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“…Zero-dimensional nanostructured materials exist in different groups, such as semiconductor quantum dots, carbon quantum dots and graphene quantum dots. These materials are characterized by optoelectronic properties such as broad excitation spectra, narrow bandwidth emission spectra, high resistance to photo-bleaching and good stability as well as biocompatibility [15,16].…”

Section: Quantum Dots In Sensing Applicationsmentioning

confidence: 99%

“…However, they have not been inves Ternary QDs exist in different groups, such as CdSeTe, CdZnSe, CuInX 2 (X = S, Se and Te) AgInX 2 (X = S, Se and Te), etc. However, current research is being focused on cadmium-free ternary QDs because of their low toxicity [16,26]. Ternary QDs can be synthesized in two ways, namely an organic route and an aqueous route (which can be further divided into two approaches: direct synthesis and ligand exchange).…”

Section: Carbon Quantum Dotsmentioning

confidence: 99%

“…Their optical properties are said to be dependent on the optimization of different parameters, including (i) the type of stabilizers, (ii) refluxing time, (iii) type or amount of dopants [29] and (iv) the type of synthetic method [30]. Apart from being environmentally friendly, these fluorescent probes exhibit two major outstanding properties: direct bandgaps and absorption coefficients as large as 10 −5 cm −1 [16,31]. However, these semiconductors suffer from surface defects, which are undesirable in sensing applications since they result in self-quenching.…”

Section: Carbon Quantum Dotsmentioning

confidence: 99%

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Synthetic Approaches, Modification Strategies and the Application of Quantum Dots in the Sensing of Priority Pollutants

Maluleke

Oluwafemi

2021

Applied Sciences

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Polycyclic aromatic hydrocarbons (PAHs) and nitro-aromatic compounds (NACs) are two classifications of environmental pollutants that have become a source of health concerns. As a result, there have been several efforts towards the development of analytical methods that are efficient and affordable that can sense these pollutants. In recent decades, a wide range of techniques has been developed for the detection of pollutants present in the environment. Among these different techniques, the use of semiconductor nanomaterials, also known as quantum dots, has continued to gain more attention in sensing because of the optical properties that make them useful in the identification and differentiation of pollutants in water bodies. Reported studies have shown great improvement in the sensing of these pollutants. This review article starts with an introduction on two types of organic pollutants, namely polycyclic aromatic hydrocarbons and nitro-aromatic explosives. This is then followed by different quantum dots used in sensing applications. Then, a detailed discussion on different groups of quantum dots, such as carbon-based quantum dots, binary and ternary quantum dots and quantum dot composites, and their application in the sensing of organic pollutants is presented. Different studies on the comparison of water-soluble quantum dots and organic-soluble quantum dots of a fluorescence sensing mechanism are reviewed. Then, different approaches on the improvement of their sensitivity and selectivity in addition to challenges associated with some of these approaches are also discussed. The review is concluded by looking at different mechanisms in the sensing of polycyclic aromatic hydrocarbons and nitro-aromatic compounds.

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Facile green synthesis of ZnInS quantum dots: temporal evolution of their optical properties and cell viability against normal and cancerous cells

Abstract: Green synthesis of Zn–In–S quantum dots and their fluorescence under an ultra violet lamp.

Cited by 25 publications

References 32 publications

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary Cu_xCd_1–xS Quantum Dots

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary Cu_xCd_1–xS Quantum Dots

Recent Advances in Photocatalytic Oxidation of 5‐Hydroxymethylfurfural

Synthetic Approaches, Modification Strategies and the Application of Quantum Dots in the Sensing of Priority Pollutants

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Facile green synthesis of ZnInS quantum dots: temporal evolution of their optical properties and cell viability against normal and cancerous cells

Abstract: Green synthesis of Zn–In–S quantum dots and their fluorescence under an ultra violet lamp.

Cited by 25 publications

References 32 publications

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary CuxCd1–xS Quantum Dots

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary CuxCd1–xS Quantum Dots

Recent Advances in Photocatalytic Oxidation of 5‐Hydroxymethylfurfural

Synthetic Approaches, Modification Strategies and the Application of Quantum Dots in the Sensing of Priority Pollutants

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Product

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Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary Cu_xCd_1–xS Quantum Dots

Cu-Enhanced Efficient Förster Resonance Energy Transfer in PBSA Sunscreen-Associated Ternary Cu_xCd_1–xS Quantum Dots