Hot injection versus room temperature synthesis of CdSe quantum dots: A differential spectroscopic and bioanalyte sensing efficacy evaluation

Mir, Irshad Ahmad; Das, Kishan; Rawat, Kamla; Bohidar, H. B.

doi:10.1016/j.colsurfa.2016.01.002

Cited by 44 publications

(24 citation statements)

References 39 publications

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“…Synthesis of CdSe The details of synthesis CdSe quantum dot (QD) at room temperature has been discussed elsewhere [13]. In the procedure of CdSe quantum dots synthesis, we prepared Cd stock solution and reacted it with NaHSe solution at room temperature (20°C).…”

Section: Synthesismentioning

confidence: 99%

A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

Mir

Singh

Rawat

2017

Water Conserv Sci Eng

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Herein, we report on the demonstration of enhanced photocatalytic reduction of methylene blue (MB) dye using a physical mixture (w/w ratio: 50:1-9) of TiO 2 nanoparticles (size ≈ 20 ± 1 nm) and CdSe nanocrystals (size ≈ 3.0 ± 0.2 nm). It was found that at the highest content of the nanocrystals (9 mg) in the physical mixture, 67% reduction in the dye concentration could be achieved in a period of 60 min to prepare a physical mixture. Nanocatalyst characterization was accomplished using XRD, SEM, FTIR, UV-visible and Raman spectroscopy. The results showed that the prepared nanocatalyst could remove MB dye from waste water under the presence, as well as in the absence of UV-irradiation, while pristine TiO 2 nanoparticles or the CdSe nanocrystals did not possess sufficient photocatalytic activity in the absence of UV-radiation. It is concluded that presence of CdSe nanocrystals at a mass concentration of less than 5% can be used for the remediation of water polluted with industrial dyes.

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Section: Synthesismentioning

confidence: 99%

A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

Mir

Singh

Rawat

2017

Water Conserv Sci Eng

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“…Transmission electron microscopy (TEM) images (150,000X) were obtained on a JEOL 2100F TEM operating at a voltage of 200 kV. For more details see refs 33 – 35 . The zeta potential measurement was carried out on an electrophoresis instrument (ZC-2000, Microtec, Japan) 33 , 34 .…”

Section: Experimental Methodsmentioning

confidence: 99%

Bandgap Tunable AgInS based Quantum Dots for High Contrast Cell Imaging with Enhanced Photodynamic and Antifungal Applications

Mir

Radhakrishanan

Rawat

et al. 2018

Sci Rep

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Herein, we report a facile microwave-assisted synthesis of cadmium-free water-soluble silver indium sulfide (AgInS2 or AIS) and AgInS@ZnS (or AIS@ZnS) core-shell quantum dots (QDs) using glutathione (GSH) as stabilizer. The core and core-shell nanocrystals exhibit tunable bandgap ranging of 2.3–3.1 and 2.4–3.5 eV, mean particle size of 2.5 and 3.25 nm, quantum yield of 26% and 49%, and fluorescence lifetimes of 326 and 438 ns, respectively. The core-shell QDs exhibit color-tunable emission in the visible region (500 to 600 nm), where the tunability was achieved by varying the molar ratio of Ag:In in the precursors. In vitro evaluation of antifungal activity of these water/ buffer stable QDs against the fungal pathogen, Candida albicans demonstrated that these were not toxic to the fungal cells upto a concentration of 100 µg/ml for 16 hours of incubation. Confocal imaging and spectrofluorometric studies showed enhanced fluorescence inside the microbial cells suggesting that AIS@ZnS particles had the capability to easily penetrate the cells. The increased generation of reactive oxygen species was evaluated for the core-shell QDs (photosensitizers) by using 9, 10-anthracenediyl-bis(methylene)dimalonic acid (ABMDMA) as singlet oxygen (1O2) scavenger molecule. These QDs have the potential for use as high contrast cell imaging, photodynamic and antifungal agents.

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“…The mixture was heated at 350 • C and shaken vigorously for 90 min. The selenium precursor (TOPSe) was prepared mixing 26 mg of selenium powder and 3 mL of TOP and it was shaken vigorously at 200 • C for 2 h. The CdSe nanoparticles solution was produced by injecting 1 mL of the selenium precursor at room temperature into the cadmium precursor whose temperature was 350 • C. After this addition, temperature of the mixture decreased to 280 • C quenching the nucleation and inducing the growth of the CdSe nuclei [29]. To monitor the growth of the nanoparticles, 2 mL aliquots of the solution were extracted at different reaction times.…”

Section: Synthesis Of Cdse Nanoparticlesmentioning

confidence: 99%

“…The method works properly when the temperature of the organic solvent mixture is approximately 350 • C, and thus high boiling point solvents are required. To avoid the oxidation of the reagents and/or nanoparticles, the reaction is usually conducted in a vacuum or in an inert atmosphere [29]. When the temperature of the solvent mixture is not as high, obtaining good results requires high pressures in the synthesis atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of CdSe nanoparticles synthesized by hot injection in air

Corea

2018

Rev. Mex. Fís.

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The hot injection technique is used to produce CdSe nanoparticles with quantum dot properties. Several reports have considered an inert atmosphere (nitrogen) as necessary for a successful synthesis, which complicates the experimental set-up. In this work, CdSe nanoparticles were synthesized by hot injection in air instead of in nitrogen, simplifying the experimental set-up. To avoid undesirable interactions with oxygen, well-defined concentrations of the organic species were used during the synthesis, but air still influenced the growth rate of the particles. To establish a comparison, the same experimental methodology was applied in nitrogen and in air. The nanoparticles synthesized in air showed a higher growth rate than those synthesized in nitrogen at the same reaction times. Additionally, similar optical behaviors and band gaps were observed in both cases, showing that an inert atmosphere is not necessary for the synthesis of quantum dots made of CdSe nanoparticles.

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Hot injection versus room temperature synthesis of CdSe quantum dots: A differential spectroscopic and bioanalyte sensing efficacy evaluation

Cited by 44 publications

References 39 publications

A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

Bandgap Tunable AgInS based Quantum Dots for High Contrast Cell Imaging with Enhanced Photodynamic and Antifungal Applications

Optical properties of CdSe nanoparticles synthesized by hot injection in air

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