Synthesis and optical properties of CdS/PVA nanocomposites

Khanna, Pawan K.; Gokhale, R.; Subbarao, V.V.V.S.; Singh, Narendra Pratap; Jun, Ki‐Won; Das, B. K.

doi:10.1016/j.matchemphys.2005.05.006

Cited by 76 publications

(27 citation statements)

References 48 publications

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“…Recently, several methods have been developed to cap the surfaces of the nanoparticles with organic or inorganic groups, so that the nanoparticles not only are stable against agglomeration but also improve some optical properties of the nanoparticles. Some particular passivators used as PVA (Khanna et al 2005), PAN (Meng et al 2000), PVP (Wang et al 2005a, b), and PAA (Xiao et al 2001) have been investigated. In this research work, polyvinyl pyrrolidone (PVP) is used as a capping agent for synthesis of the Co-doped CdS nanoparticles by chemical method.…”

Section: Introductionmentioning

confidence: 99%

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

2014

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Co 2? (1-5 and 10 %)-doped cadmium sulfide nanoparticles were synthesized by the chemical precipitation method using polyvinyl pyrrolidone (PVP) as a surfactant. The X-ray diffraction results showed that Co ions were successfully incorporated into the CdS lattice and the transmission electron microscopy results revealed that the synthesized particles were aligned as rod-like structures. The absorption spectra of all the prepared samples (undoped and doped) were significantly blue shifted (472-504 nm) from the bulk CdS (512 nm). However, the absorption spectra of the doped samples were red shifted (408-504 nm) with respect to the doping concentrations (1-5 and 10 %). Furthermore, a dramatic blue shift absorption is observed at 472 nm for PVP-capped CdS:Co 2? (4 %) nanoparticles. In the photoluminescence study, two emission peaks were dominated in the green region at 529 and 545 nm corresponding the CdS:Co 2? nanoparticles. By correlating optical and EPR spectral data, the site symmetry of Co 2? ion in the host lattice was determined as both octahedral and tetrahedral. The presence of functional groups in the synthesized nanoparticles was identified by Fourier transform infrared spectroscopy. The thermal stability of the Co ions in CdS nanoparticles was studied by TG-DTA. In addition, an electrochemical property of the undoped and doped samples was studied by cyclic voltammetry for electrode applications.

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Section: Introductionmentioning

confidence: 99%

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

2014

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“…Figure 3b shows that the PL band of the nanocomposite is almost unchanged by the UV illumination. Taking into account that the emission of CdS/PVA nanocomposite is related to the NPs [14,15], from the comparison of Figure 3a,b, one can conclude that UV light causes drastic alterations in the defect subsystem of pure composite but does not change NPs. In what follows, we will discuss possible mechanisms of NP participation in polymer protection and illustrate them by the schemes in Figure 4.…”

Section: Resultsmentioning

confidence: 91%

Enhancement of polymer endurance to UV light by incorporation of semiconductor nanoparticles

Rudko¹,

Kovalchuk²,

Fediv³

et al. 2016

Nano Online

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Improvement of polyvinyl alcohol stability against ultraviolet (UV) illumination is achieved by introducing cadmium sulfide (CdS) nanoparticles into the polymeric matrix. Enhancement of stability is analyzed by optical characterization methods. UV protection is achieved by diminishing the probability of photo-activated formation of defects in polymer. The sources of polymer protection are the lowering of the efficiency of polymer excitation via partial absorption of incident light by the embedded nanoparticles as well as the de-excitation of the macromolecules that have already absorbed UV quanta via energy drain to nanoparticles. Within the nanoparticles, the energy is either dissipated by conversion to the thermal energy or reemitted as visible-range photoluminescence quanta.

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“…The low-energy band was interpreted in two ways. The radiative transitions in this spectral range were either ascribed to some deep traps formed by the surface defects in doped CdS NPs [12,[14][15][16] or to intra3d transition of Mn 2+ ions incorporated in CdS crystals [14,17,18]. We assume that both types of radiative centers contribute to the low-energy band observed in our samples [18].…”

Section: Photoluminescence Studiesmentioning

confidence: 88%

“…Similar bands were previously observed in doped colloidal CdS NPs grown by somewhat different growing procedures. The highenergy band lies in the spectral range of the near band edge luminescence and is usually ascribed to shallow traps [12,13]. The low-energy band was interpreted in two ways.…”

Section: Photoluminescence Studiesmentioning

confidence: 99%

Analysis of conditions for synthesis of CdS:Mn nanoparticles

Kovalchuk¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. The detailed analysis of the synthesis of CdS:Mn nanoparticles in polyvinyl alcohol polymeric matrix is presented and the ranges of optimal growth parameters are determined. The estimated values of parameters were used to produce solutions of CdS:Mn nanoparticles and corresponding solid composites. The sizes of nanoparticles and structure of composite films were characterized by electron microscopy methods, optical properties were probed using photoluminescence methods.

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Synthesis and optical properties of CdS/PVA nanocomposites

Cited by 76 publications

References 48 publications

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

Enhancement of polymer endurance to UV light by incorporation of semiconductor nanoparticles

Analysis of conditions for synthesis of CdS:Mn nanoparticles

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