OPTICAL PROPERTIES OF CHEMICALLY PREPARED <font>CdS</font> QUANTUM DOTS IN POLYVINYL ALCOHOL

Barman, Jayanta; Borah, Jnanraj; Sarma, Kamal

doi:10.1142/s0217979209049917

Cited by 15 publications

(9 citation statements)

References 17 publications

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“…It was found that the Stokes shifts of PVA and PVA–ZnS composites are 151 and 185.5–196 nm, respectively. Similar larger Stokes shift of the PVA and PVA-based materials were observed and explained in ref (33). Furthermore, looking at the PL spectra, it can be seen that the intensity increases for all composite samples compared to PVA (Figure 4).…”

Section: Results and Discussionsupporting

confidence: 88%

Simple Fabrication of PVA–ZnS Composite Films with Superior Photocatalytic Performance: Enhanced Luminescence Property, Morphology, and Thermal Stability

et al. 2019

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Poly(vinyl alcohol) (PVA)–ZnS composite films were prepared by varying the composition of PVA ranging from 1–5 wt % through a simple solvent casting method. The photocatalytic enactment of the composites was evaluated along with the investigations of their photoluminescence (PL), optical transparency, morphology, and thermal properties. The firm interaction between the ZnS and PVA was confirmed by Fourier transform infrared, UV–vis, and PL spectroscopies. PVA–ZnS composites showed enhanced luminescence property than PVA. The composites exhibited very good optical transparency regardless of the amount of PVA addition. The thermogravimetric analysis data indeed exhibited better thermal stability of the composites. The glass transition temperature ( T g ), melting temperature ( T m ), enthalpy of melting (Δ H m ), and crystallinity were evaluated for such composites. The composites demonstrated morphological variations depending on the amount of PVA addition, although the particle size of ZnS remained similar in the nanometer range (50–120 nm) for all composite samples. The prepared composite films exhibited superior photocatalytic performance in the degradation of methylene blue compared with the bare ZnS and PVA. This study may give a new insight into the fabrication of PVA–ZnS photocatalysts for the treatment of organic pollutants.

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Section: Results and Discussionsupporting

confidence: 88%

Simple Fabrication of PVA–ZnS Composite Films with Superior Photocatalytic Performance: Enhanced Luminescence Property, Morphology, and Thermal Stability

et al. 2019

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“…Factors such as control of film thickness and deposition rate by varying the solution pH, temperature and reagent concentration are allied with the ability of CBD to coat large areas in a reproducible and low cost process. Another advantage of CBD method with respect to other methods is that the films can be deposited on different kinds, shapes and sizes of substrates (Kale and Lokhande 2005;Barman et al 2008).…”

Section: Study Of CD (1−x)mentioning

confidence: 99%

Effect of copper doping on structural, optical and electrical properties of Cd0·8Zn0·2S films prepared by chemical bath deposition

2014

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Cd 0•8 Zn 0•2 S:Cu films of 1•3-6•1 mole percentage of copper have been grown on mica substrate by using chemical bath deposition technique. The films have been characterized by using XRD, SEM and UV spectrophotometer. X-ray diffraction studies have shown that the films are polycrystalline. The average crystallite size as measured from XRD data is in the range of 125-130 nm. The activation energies of Cd 0•8 Zn 0•2 S:Cu films, as observed from d.c. conductivity studies in the temperature range (77-300 K) studied, decreased with the increase in Cu concentration. The optical absorption studies have revealed that the energy gap increases gradually with an increase in Cu concentration, whereas conductivity studies have shown an anomalous increase in conductivity in films of 3•8 mole percentage of Cu. SEM pictures have revealed the presence of defects with spherical structure having fibre network. The variation of electrical conductivity is explained based on the defects present and by adopting tunneling mechanism.

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“…The shifting of peak position to higher diffraction angle due to strain was confirmed by calibrating the XRD prior to each observation using standard silicon sample. 11,12 The size of the nanocrystal was determined using Scherer formula 13…”

Section: Tem Observationmentioning

confidence: 99%

EFFECT OF pH ON ZnS NANOCRYSTALLINE THIN FILM EMBEDDED IN A POLYVINYL ALCOHOL MATRIX

Borah

Barman

Sarma

2010

Int. J. Mod. Phys. B

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Polyvinyl alcohol (PVA) has been used as a matrix to synthesize ZnS/PVA nanocomposite film on glass substrate by chemical method. Transmission electron microscopy (TEM), X-ray diffraction (XRD), Scanning electron microscopy (SEM) has been used for structural, morphological and compositional characterization. Optical properties have been studied by UV-Visible spectrophotometry and photoluminescence (PL) spectroscopy. Changing pH value from 4.8 to 0.8 decreases the particle size and correspondingly increases the band gap. The PL emission intensity also increases by decreasing the pH values.

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OPTICAL PROPERTIES OF CHEMICALLY PREPARED CdS QUANTUM DOTS IN POLYVINYL ALCOHOL

Cited by 15 publications

References 17 publications

Simple Fabrication of PVA–ZnS Composite Films with Superior Photocatalytic Performance: Enhanced Luminescence Property, Morphology, and Thermal Stability

Simple Fabrication of PVA–ZnS Composite Films with Superior Photocatalytic Performance: Enhanced Luminescence Property, Morphology, and Thermal Stability

Effect of copper doping on structural, optical and electrical properties of Cd0·8Zn0·2S films prepared by chemical bath deposition

EFFECT OF pH ON ZnS NANOCRYSTALLINE THIN FILM EMBEDDED IN A POLYVINYL ALCOHOL MATRIX

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