Light emitting CdS quantum dots in PMMA: Synthesis and optical studies

Khanna, Pawan K.; Singh, Narendra Pratap

doi:10.1016/j.jlumin.2007.02.037

Cited by 117 publications

(61 citation statements)

References 38 publications

(53 reference statements)

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“…The general features of these QD RT optical characteristics compare well with previous results in the field of high quality NCs [14,17,18]. Nevertheless, the still relatively large width of these transitions will be certainly obtained after improving size dispersion of our samples.…”

Section: Results and Discussion A Typical Tem Image Is Shown Insupporting

confidence: 86%

Physical and chemical cross analyses of II‐VI semiconductor nanomaterials

Dalmasso¹,

Arl²,

Frégnaux³

et al. 2010

Phys. Status Solidi (c)

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CdS quantum dots (QDs) are synthesized by the single source precursor thermal method. Compared with previous reports, a temperature ramp allows faster elaboration of smaller nanocrystals (NCs) with efficient room temperature (RT) visible emission. A cross‐disciplinary study between chemical analyses and physical techniques provides consistent data for these small NCs. Joint mass spectrometry, transmission electron microscopy and optical spectrometry techniques give a consistent picture about purity and stability of precursors, average size and size dispersion of the NCs, as well as their optical spectral response in correlation with their size via quantum confinement effects. RT photoluminescence spectroscopy reveals the great potential of such QDs and their tunable response wavelength in the visible spectrum. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Results and Discussion A Typical Tem Image Is Shown Insupporting

confidence: 86%

Physical and chemical cross analyses of II‐VI semiconductor nanomaterials

Dalmasso¹,

Arl²,

Frégnaux³

et al. 2010

Phys. Status Solidi (c)

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“…In the graph, initial weight loss at about 150°C is considered due to vaporization of volatiles such as trapped solvent from PMMA. The secondstage weight loss at about 430°C may be due to decomposition of PMMA itself [19]. The observations indicate that the presence of CdS nanorods in PMMA leads to slow decomposition of the polymer as against the sharp degradation of PMMA alone (Fig.…”

Section: Thermal Analysismentioning

confidence: 89%

Fabrication of bistable switching device using CdS nanorods embedded in PMMA (polymethylmethacrylate) nanocomposite

Ganesh

Elamaran²,

Navaneethan

et al. 2015

J Mater Sci: Mater Electron

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An organic bistable memory device was fabricated using CdS NR's/PMMA (polymethylmethacrylate) nanocomposite sandwiched between ITO and Al thin film. XRD analysis confirmed that CdS NR's reveals wurtzite hexagonal phase. FESEM and TEM images showed the monodispersed rod-like morphology. The nanorods were uniformly dispersed in the PMMA (polymethylmethacrylate) layer. EDX spectrum confirms that the product consists of only Cd and S elements. No other impurities were found. UVvisible absorption of CdS NR's showed a slight blue shift. The photoluminescence spectra of CdS NR's spectra showed surface defects which may be due to sulfur vacancies in surface of nanorods. The CdS NR's polymer nanocomposite showed better thermal stability. The current-voltage (C-V) measurement of ITO/CdS NR's/Al showed a clockwise hysteresis with flatband shift voltage in C-V curve for the device.

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“…6À9 Following this approach, material scientists have sought to develop novel composites using many polymer/nanoparticle composite systems. 10À15 Some examples are ZnO/ PMMA, 16,17 ZnO/poly(hydroxyethyl methacrylate), 18 Al 2 O 3 / polycarbonate, 19 TiO 2 /poly(vinyl alcohol), 20 CdS/PS, 10 CdS/ PMMA, 21 ZrO 2 /PMMA, 22 CdTe/PS, 23 and BaTiO 3 /polyimide. 24 However, the refractive indices (RIs) of polymers and inorganic particles are usually different.…”

Section: ' Introductionmentioning

confidence: 99%

Toward Transparent Nanocomposites Based on Polystyrene Matrix and PMMA-Grafted CeO₂ Nanoparticles

Parlak

Demir

2011

ACS Appl. Mater. Interfaces

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The association of transparent polymer and nanosized pigment particles offers attractive optical materials for various potential and existing applications. However, the particles embedded into polymers scatter light due to refractive index (RI) mismatch and reduce transparency of the resulting composite material. In this study, optical composites based on polystyrene (PS) matrix and poly(methyl methacrylate) (PMMA)-grafted CeO2 hybrid particles were prepared. CeO2 nanoparticles with an average diameter of 18 ± 8 nm were precipitated by treating Ce(NO3)·6H2O with urea in the presence of a polymerizable surfactant, 3-methacyloxypropyltrimethoxy silane. PMMA chains were grafted on the surface of the nanoparticles upon free radical in situ solution polymerization. While blending of unmodified CeO2 particles with PS resulted in opaque films, the transparency of the composite films was remarkably enhanced when prepared by PMMA-grafted CeO2 hybrid particles, particularly those having a PMMA thickness of 9 nm. The improvement in transparency is presumably due to the reduction in RI mismatch between CeO2 particles and the PS matrix when using PMMA chains at the interface.

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Light emitting CdS quantum dots in PMMA: Synthesis and optical studies

Cited by 117 publications

References 38 publications

Physical and chemical cross analyses of II‐VI semiconductor nanomaterials

Physical and chemical cross analyses of II‐VI semiconductor nanomaterials

Fabrication of bistable switching device using CdS nanorods embedded in PMMA (polymethylmethacrylate) nanocomposite

Toward Transparent Nanocomposites Based on Polystyrene Matrix and PMMA-Grafted CeO₂ Nanoparticles

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Light emitting CdS quantum dots in PMMA: Synthesis and optical studies

Cited by 117 publications

References 38 publications

Physical and chemical cross analyses of II‐VI semiconductor nanomaterials

Physical and chemical cross analyses of II‐VI semiconductor nanomaterials

Fabrication of bistable switching device using CdS nanorods embedded in PMMA (polymethylmethacrylate) nanocomposite

Toward Transparent Nanocomposites Based on Polystyrene Matrix and PMMA-Grafted CeO2 Nanoparticles

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Product

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Toward Transparent Nanocomposites Based on Polystyrene Matrix and PMMA-Grafted CeO₂ Nanoparticles