Photoluminescence properties of thermally stable highly crystalline CdS nanoparticles

Dhage, Sanjay R.; Colorado, Henry A.; Hahn, H. Thomas

doi:10.1590/s1516-14392013005000020

Cited by 26 publications

(11 citation statements)

References 22 publications

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“…The (111), (220), and (311) reflection planes can be observed in the SAED pattern of the CdS nanocrystals. 28 These results are typical of a very fine-grained material and indicate the crystalline nature of the as-synthesized samples. These results suggest that the PEG branches acted as a very effective stabilizer for preparation of a stable colloidal solution consisting of well-dispersed, monodispersed CdS nanocrystals.…”

Section: High-resolution Transmission Electron Microscopy Measurementsmentioning

confidence: 68%

Preparation, Characterization, and Size Control of Chemically Synthesized CdS Nanoparticles Capped with Poly(ethylene glycol)

Seoudi

Allehyani

Said

et al. 2015

Journal of Elec Materi

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We prepared cadmium sulfide (CdS) nanoparticles of a specific size via chemical precipitation at room temperature and characterized them using high-resolution transmission electron microscopy, x-ray powder diffraction, ultraviolet-visible spectroscopy, and Fourier-transform infrared (FTIR) measurements. The results showed that the samples were grown with a cubic phase; the particle size could be changed from 2 nm to 4 nm by varying the molar ratios of the precursors (cadmium chloride and sodium sulfide) in the presence of poly(ethylene glycol) (PEG) as an effective capping agent. The optical bandgap of the synthesized nanoparticles was calculated and ranged from 2.73 eV to 2.92 eV depending on the particle size. A large blue-shift from the bulk bandgap (2.42 eV) was observed owing to the quantum size effect. Surface passivation and adsorption of PEG on the CdS nanoparticles was explained on the basis of FTIR measurements; two bands were observed at 476 cm À1 and 622 cm À1 , corresponding to cadmium and sulfide stretching vibrations. We conclude that particle size can be controlled by varying the molar ratios of the precursors. Owing to the PEG encapsulation, the as-prepared samples were extremely stable over time.

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Section: High-resolution Transmission Electron Microscopy Measurementsmentioning

confidence: 68%

Preparation, Characterization, and Size Control of Chemically Synthesized CdS Nanoparticles Capped with Poly(ethylene glycol)

Seoudi

Allehyani

Said

et al. 2015

Journal of Elec Materi

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“…Interaction of the particle surface with an environment and interaction between individual nanoparticles themselves could also affect their optical characteristics. Latter can occur through electronic or resonance energy transfer [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

Biosynthesis of luminescent CdS quantum dots using plant hairy root culture

et al. 2014

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CdS nanoparticles have a great potential for application in chemical research, bioscience and medicine. The aim of this study was to develop an efficient and environmentally-friendly method of plant-based biosynthesis of CdS quantum dots using hairy root culture of Linaria maroccana L. By incubating Linaria root extract with inorganic cadmium sulfate and sodium sulfide we synthesized stable luminescent CdS nanocrystals with absorption peaks for UV-visible spectrometry at 362 nm, 398 nm and 464 nm, and luminescent peaks at 425, 462, 500 nm. Transmission electron microscopy of produced quantum dots revealed their spherical shape with a size predominantly from 5 to 7 nm. Electron diffraction pattern confirmed the wurtzite crystalline structure of synthesized cadmium sulfide quantum dots. These results describe the first successful attempt of quantum dots synthesis using plant extract.PACS81.07.Ta; 81.16.-c; 81.16.Rf

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“…The second band at 492-495 nm (2.51 eV) could be assigned to the band gap transition (edge to edge) of CdS nanoparticles. The third one at 522-529 nm (2.36 eV) should be associated with the band gap transition of bulk CdS [21,22]. The emission band at 538 to 550 nm (2.28 eV) should be electron transition from energy levels of surface states or bulk defects to the valence band of CdS.…”

Section: Cds Crystal Size and Emissionmentioning

confidence: 99%

Microwave Synthesized Monodisperse CdS Spheres of Different Size and Color for Solar Cell Applications

Rodríguez-Castañeda

Moreno-Romero

Martínez-Alonso

et al. 2015

Journal of Nanomaterials

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Monodisperse CdS spheres of size of 40 to 140 nm were obtained by microwave heating from basic solutions. It is observed that larger CdS spheres were formed at lower solution pH (8.4–8.8) and smaller ones at higher solution pH (10.8–11.3). The color of CdS products changed with solution pH and reaction temperature; those synthesized at lower pH and temperature were of green-yellow color, whereas those formed at higher pH and temperature were of orange-yellow color. A good photovoltage was observed in CdS:poly(3-hexylthiophene) solar cells with spherical CdS particles. This is due to the good dispersion of CdS nanoparticles in P3HT solution that led to a large interface area between the organic and inorganic semiconductors. Higher photocurrent density was obtained in green-yellow CdS particles of lower defect density. The efficient microwave chemistry accelerated the hydrolysis of thiourea in pH lower than 9 and produced monodisperse spherical CdS nanoparticles suitable for solar cell applications.

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Photoluminescence properties of thermally stable highly crystalline CdS nanoparticles

Cited by 26 publications

References 22 publications

Preparation, Characterization, and Size Control of Chemically Synthesized CdS Nanoparticles Capped with Poly(ethylene glycol)

Preparation, Characterization, and Size Control of Chemically Synthesized CdS Nanoparticles Capped with Poly(ethylene glycol)

Biosynthesis of luminescent CdS quantum dots using plant hairy root culture

Microwave Synthesized Monodisperse CdS Spheres of Different Size and Color for Solar Cell Applications

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