Photoluminescence of CdS nanoparticles embedded in a starch matrix

Rodríguez-Fragoso, P.; Cruz, G. González de la; Tomás, S.A.; Mendoza-Álvarez, J.G.; Zelaya-Ángel, O.

doi:10.1016/j.jlumin.2010.02.008

Cited by 11 publications

(7 citation statements)

References 37 publications

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“…For CdS with TG, XRD pattern can be indexed as hexagonal wurtzite structure of CdS and they appear in good agreement with JCPDS data card No. 00-041-1049 with prominent peaks at scattering angles (2 θ ) of 24.9, 26.56, 28.27, 36.62, 43.96, 47.86, and 51.93, which could be indexed to scattering from the (100), (002), (101), (102), (110), (103), and (112) planes, respectively (Rodriguez-Fragoso et al 2010 ). From the above results, we can conclude that the change of the stabilizers affects the crystallinity and the mean size of the produced nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Time resolved and temperature dependence of the radiative properties of thiol-capped CdS nanoparticles films

et al. 2014

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In this work, we present the temperature-dependence and time-resolved photoluminescence (PL) of CdS nanoparticles capped independently with three different ligands thiophenol, thioglycerol, and l-cysteine over a broad temperature range from 10 to 300 K. The respective nanoparticles sizes in the three systems studied in this work are 1.5, 4, and 2 nm as determined from X-ray diffraction (XRD). From the analysis of AFM images, it was found that the lateral particle sizes of capped CdS nanoparticles are greater than those deduced from XRD or optical absorption measurements. The aim of this study is the investigation of the impact of the organic ligands on the radiative recombination dynamics in organically capped CdS nanoparticles. From the PL study and based on the temperature-dependence and time-resolved emission spectroscopy, we conclude that the emission of CdS QDs film originates from recombination of the delocalized carriers in the internal core states with a small contribution of the localized carriers at the interface. The PL decay reveals a biexponential behavior for the entire three samples at all temperatures. One of the two exponential components decays rapidly with a time τ1 in the range 0.5–0.8 ns, whereas the other decays much more slowly, with a time τ2 in the range 1–3 ns. The weak activation energy (32–37 meV) deduced from the temperature dependence of the PL intensity suggests the involvement of shallow traps. The analysis of the experimental results reveals a relatively narrow size distribution, an efficient surface passivation, and a satisfactory thermal stability of CdS nanocrystals.

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Section: Resultsmentioning

confidence: 99%

Time resolved and temperature dependence of the radiative properties of thiol-capped CdS nanoparticles films

et al. 2014

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“…31 Figure 2Ac shows only the emission from defect bands, and Figure 2Bf shows emission from the above-mentioned three bands. These results also support the formation of CdS nanoparticles in PS-b-P2VP micelles.…”

Section: Hierarchical Assembly Of Cds Nanoparticles H Yabu Et Almentioning

confidence: 99%

Hierarchical assembly of CdS nanoparticles in polymer particles with phase separation structures

Yabu

Endo

Koike

et al. 2011

Polym J

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The preparation of size-controlled CdS nanoparticles in block copolymer micelles and formation of composite particles of CdS nanoparticles and polymers are described in this paper. Uniformly sized CdS nanoparticles with different emission wavelengths were successfully synthesized. In addition, composite Janus particles, unidirectionally stacked lamellae particles and onion particles were formed by combining CdS nanoparticles and polymer blend or block copolymer systems. This approach provides a simple route for the preparation of functional organic/inorganic composite particles.

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“…The low intensity of ZnS/PVA peaks can be attributed to interaction of metal sulfides with PVA; metal sulfides decrease the degree of PVA crystallinity when incorporated in PVA polymer [53]. In the XRD pattern of the PVA/CdS composite, the characteristic peak of the PVA is noticeable with other peaks at 2 = 10.96 [55] and indicate the admixture of both phases. The particles sizes could not be calculated from using Debye-Scherer equation because the peaks overlap with the polymer peaks.…”

Section: Thermal Analysis Of Pvp and Nanocomposites Figures 4(a)-4(c)mentioning

confidence: 99%

Structural and Thermal Studies of ZnS and CdS Nanoparticles in Polymer Matrices

Osuntokun

Ajibade

2016

Journal of Nanomaterials

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We report the synthesis and structural studies of ZnS and CdS nanoparticles in polyvinylpyrrolidone (PVP), poly(vinyl alcohol) (PVA), and poly(methyl methacrylate) (PMMA) matrices. The metal sulfides/polymer nanocomposites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, electronic spectroscopy (UV-Vis), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The particle sizes as calculated from the absorption spectra were in agreement with the results obtained from TEM and XRD data. They showed metal sulfides nanoparticles in the polymers matrices with average crystallite sizes of 1.5–6.9 nm. The TGA results indicate that incorporation of the nanoparticles significantly altered the thermal properties of the respective polymers with ZnS/PVA and CdS/PVA nanocomposites displaying higher thermal stability than the other polymer nanocomposites.

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Photoluminescence of CdS nanoparticles embedded in a starch matrix

Cited by 11 publications

References 37 publications

Time resolved and temperature dependence of the radiative properties of thiol-capped CdS nanoparticles films

Time resolved and temperature dependence of the radiative properties of thiol-capped CdS nanoparticles films

Hierarchical assembly of CdS nanoparticles in polymer particles with phase separation structures

Structural and Thermal Studies of ZnS and CdS Nanoparticles in Polymer Matrices

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