Synthesis and characterization of CdS nanocrystals stabilized in polyvinyl alcohol–sodium polyphosphate

Ferrer, Juan Carlos; Salinas-Castillo, Alfonso; Alonso, José L.; Ávila, Susana Fernández de; Mallavia, Ricardo

doi:10.1016/j.matlet.2008.12.007

Cited by 22 publications

(16 citation statements)

References 15 publications

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“…Figure 2 shows a high resolution image of an ensemble of NPs within the polymer matrix. This type of agglomeration has been previously reported in NPs hosted in polymers [18][19][20]. PbS crystals have an average diameter of 5 nm approximately and show good crystal quality.…”

Section: Optical Characterization Of Diluted Solutionssupporting

confidence: 76%

Facile Preparation of Optically Tailored Hybrid Nanocomposite

Ávila

Ferrer

Alonso

et al. 2014

Journal of Nanomaterials

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Lead sulfide nanoparticles (PbS NPs) have been synthesized directly in poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) semiconducting polymer by a simple low temperature method. Hybrid solutions with different concentrations of PbS with respect to the polymer have been prepared and characterized first in solution and then as thin film nanocomposites deposited on quartz substrates by spin coating. Quenching of photoluminescence emission is observed both in solutions and thin films when the ratio of PbS NPs increases with respect to the polymer, suggesting the occurrence of Dexter energy transfer from the polymer to the PbS NPs. Optical absorption is markedly increased for hybrid solutions compared to pure polymer. In thin nanocomposite films an enhancement of absorbance is observed with increasing PbS NPs concentration, which is more pronounced below 400 nm. The reported results could lead to the development of a method for tailoring the optical response of devices based on PbS NP-polymer nanocomposite by controlling the PbS NP concentration inside the polymer matrix.

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Section: Optical Characterization Of Diluted Solutionssupporting

confidence: 76%

Facile Preparation of Optically Tailored Hybrid Nanocomposite

Ávila

Ferrer

Alonso

et al. 2014

Journal of Nanomaterials

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“…The fact that the size is similar for the samples with higher PbS concentrations suggests that the addition of further sulfur and lead precursors is followed by the formation of a higher number of quantum dots instead of increasing their size. This type of agglomeration has been previously reported in nanoparticles hosted in polymers such as PVA [15] and polyacrylamide [16]. A likely explanation is that several polymer chains could be bridged by connecting to the same nanoparticle, as long as neighbor nanoparticles could share a polymer chain.…”

Section: Transmission Electron Microscopysupporting

confidence: 70%

Synthesis and characterization of PbS nanocrystals in MDMO-PPV semiconducting polymer for photovoltaic applications

Ferrer

Salinas-Castillo

Mallavia

et al. 2009

2009 Spanish Conference on Electron Devices

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We report on a simple method to synthesize PbS quantum dots directly in poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene] conducting polymer. Optical absorption, photoluminescence and transmission electron microscopy measurements have been performed in order to characterize the colloidal suspension with different proportions of PbS nanocrystals. Results show that as the PbS amount rises, the optical density of the compound increases slightly and the luminescence is partially quenched. Microscopy results show that increasing the amount of quantum dot precursors is followed by a higher density of nanocrystals, although the particle size remains nearly unchanged.

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“…Polyvinyl alcohol (PVA) is a water soluble polyhydroxy polymer frequently used as a colloid stabilizer [7]. Due to superior optical and mechanical properties of PVA films, like emulsifying, optical transparency, good adhesive properties, and formation of good oxygen resistant films, makes it a good choice for the fabrication of optical devices [8].…”

Section: Introductionmentioning

confidence: 99%

Optical and structural investigation of synthesized PVA/PbS nanocomposites

Abdullah

Tahir

Kadir

2015

J Mater Sci: Mater Electron

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Polymer nanocomposite based on polyvinyl alcohol (PVA) and lead sulfide (PbS) in the average radius of (1.88-2.23) nm, have been synthesized using the chemical reduction rote and solution casting technique for different concentrations of PbS. The characterization of the polymer nanocomposite films were carried out using UVvisible spectroscopy, SEM, and XRD. The effect of various concentration of PbS NP on the optical properties of the composite has been studied to understand the optimum conditions for the synthesis process. The nanocomposite film shows high UV and visible light absorptions in the wavelength range of (200-500) nm, which correspond to the characteristics of the PbS NPs. The significant decreasing trend of the direct allowed band gap of the nanocomposite was observed upon increasing the Pb source concentration, from (6.27 eV) for pure PVA to (2.34 eV) for 0.04 M PbS concentration, which is much higher than the energy gap of bulk PbS value (0.41 eV). The calculated values of the static refractive index of Cauchy dispersion model were in the range of (1.09-1.20).X-ray diffraction analysis confirmed the cubic nanocrystalline PbS phase formation.

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Synthesis and characterization of CdS nanocrystals stabilized in polyvinyl alcohol–sodium polyphosphate

Cited by 22 publications

References 15 publications

Facile Preparation of Optically Tailored Hybrid Nanocomposite

Facile Preparation of Optically Tailored Hybrid Nanocomposite

Synthesis and characterization of PbS nanocrystals in MDMO-PPV semiconducting polymer for photovoltaic applications

Optical and structural investigation of synthesized PVA/PbS nanocomposites

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