Formation of monodispersed PVP-capped ZnS and CdS nanocrystals under microwave irradiation

He, Rong; Qian, Xuefeng; Yin, Jie; Xi, Hong-An; Bian, Li-juan; Zhu, Zhiwei

doi:10.1016/s0927-7757(03)00072-4

Cited by 98 publications

(47 citation statements)

References 19 publications

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“…The presence of PVP limits aggregation [12,17] and gives the wool-like appearance that is observed in the picture. This result is consistent with other results of polymer capped nanoparticles as reported in the literature [18]. To investigate the chemical composition of CdS sample, the elemental analysis of samples was performed using Energy-dispersive X-ray spectroscopy.…”

Section: Morphological and Textural Analysessupporting

confidence: 91%

Photocatalytic Reduction of Aqueous Cr(VI) with CdS under Visible Light Irradiation: Effect of Particle Size

Makama

Salmiaton

Saion

et al. 2016

Bull. Chem. React. Eng. Catal.

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Stringent environmental standards have made the removal of Cr(VI) from water an important problem for environmental scientist and engineering. Heterogeneous photocatalysis using suspended photocatalyst is an interesting technique to consider for this application. In this work, the influence of particle size of suspended CdS on the photocatalytic reduction of aqueous Cr(VI) ion was investigated. The efficiency of Cr(VI) reduction was monitored through UV-visible analysis. The experimental results showed that the nanoparticle size has a dramatic effect on the adsorption and reduction of Cr(VI). As surface area increased from 44.2±0.6 to 98.7±0.5 m 2 /g due to particle size reduction, the rate of Cr(VI) reduction nearly doubled in the first 20 min of visible light irradiation. The results evidenced the inverse relationship between the apparent reduction rate constant and the CdS particle size. Conversely, the half-life (t1/2) period of the photocatalytic reduction has a direct relationship with CdS particle sizes.

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Section: Morphological and Textural Analysessupporting

confidence: 91%

Photocatalytic Reduction of Aqueous Cr(VI) with CdS under Visible Light Irradiation: Effect of Particle Size

Makama

Salmiaton

Saion

et al. 2016

Bull. Chem. React. Eng. Catal.

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“…From the position of the absorption edge, the average particle size can be determined by using the well-established relation between particle size and absorption onset. 14,15 The absorption edge (λ e ) is converted into the corresponding particle size by using Henglein's empirical curve that relates the absorption edge (λ e ) to the diameter (2R) of the particles.…”

Section: Resultsmentioning

confidence: 99%

Aggregated CdS Quantum Dots: Host of Biomolecular Ligands

Narayanan

Pal

2006

J. Phys. Chem. B

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In this contribution, we have studied structural and photophysical properties of aggregated CdS quantum dots (QDs) capped with 2-mercaptoethanol in aqueous medium. The hydrodynamic diameter of the nanostructures in aqueous solution was found to be ∼160 nm with the dynamic light scattering (DLS) technique, which is in close agreement with atomic force microscopy (AFM) studies (diameter ∼150 nm). However, the UVvis absorption spectroscopy, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM) studies confirm the average particle size (QD) in the nanoaggregate to be 4.0 ( 0.5 nm. The steady-state and time-resolved photoluminescence studies on the QDs further confirm preservation of electronic band structure of the QDs in the nanoaggregate. To study the nature of the nanoaggregate we have used small fluorescent probes, which are widely used as biomolecular ligands (2,6-p-toluidinonaphthalene sulfonate (TNS) and Oxazine 1), and found the pores of the aggregate to be hydrophobic in nature. The significantly large spectral overlap of the host quantum dots (donor) with that of the guest fluorescent probe Oxazine 1 (acceptor) allows us to carry out Förster resonance energy transfer (FRET) studies to estimate average donor-acceptor distance in the nanostructure, found to be ∼25 Å. The quantum dot aggregate and the characterization techniques reported here could have implications in the future application of the QD-nanoaggregate as host of small ligand molecules of biological interest.

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“…The band gap energy of NPs is dependent on particle size and lattice structure; to understand the transitions between the electronic states requires a quantum theory treatment. From the position of the absorption edge, the average particle size can be determined using Henglein's empirical relation between particle size and the absorption wavelength [30,31]. …”

Section: Uv-visible Absorption Analysismentioning

confidence: 99%

One-pot sonochemical synthesis of CdS nanoparticles: photocatalytic and electrical properties

et al. 2015

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CdS nanoparticles (NPs) are synthesized by sonochemical method using tryptophan as a capping agent. The synthesis process is of one step, using biocompatible capping agent, which is nontoxic. The synthesized NPs are characterized by UV-Vis absorption, fluorescence, FTIR, XRD, TGA, DLS, SEM and TEM. The size of NPs is below 10 nm, as observed from XRD and TEM characterizations. Photocatalytic degradation of methyl orange (MO) dye by the CdS NPs as photocatalysts under sunlight irradiation has been studied. The kinetics of catalysis of synthesized CdS NPs with MO dye follows pseudo-firstorder kinetics with reasonable apparent rate constants. A variation of dielectric constant as a function of frequencies of an alternating electric field has been observed with the prepared tryptophan-capped CdS NPs deposited at different concentrations. The electric conductivity of CdS NPs is found to increases with the concentration of tryptophan.

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Formation of monodispersed PVP-capped ZnS and CdS nanocrystals under microwave irradiation

Cited by 98 publications

References 19 publications

Photocatalytic Reduction of Aqueous Cr(VI) with CdS under Visible Light Irradiation: Effect of Particle Size

Photocatalytic Reduction of Aqueous Cr(VI) with CdS under Visible Light Irradiation: Effect of Particle Size

Aggregated CdS Quantum Dots: Host of Biomolecular Ligands

One-pot sonochemical synthesis of CdS nanoparticles: photocatalytic and electrical properties

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