Phase Transitions and Stabilization of the Organized Hybrid Langmuir-Blodgett Films of Alkanoic Acids/CdS and PbS Q-Particles

Konopny, L.; Berfeld, Maria; Popovitz‐Biro, Ronit; Weissbuch, Isabelle; Leiserowitz, Leslie; Lahav, Michal

doi:10.1002/1521-4095(200104)13:8<580::aid-adma580>3.0.co;2-7

Cited by 19 publications

(9 citation statements)

References 2 publications

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“…Nanocrystallites of semiconductors and conducting metals that display quantum‐size effects, referred to as quantum particles (Q‐particles), are attracting great interest owing to their unique optoelectronic properties 1–4. Recently, it was demonstrated that organization of the Q‐particles in periodic patterns can lead to cooperative properties not shown by the individual components of the composite 5–11. In recent years, different methodologies have been followed for the preparation of organized composites.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Composites of Monodisperse π-Conjugated Rodlike Organic Compounds and Semiconductor Quantum Particles

et al. 2002

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Composite materials of quantum particles (Q‐particles) arranged in layers within crystalline powders of π‐conjugated, rodlike dicarboxylic acids are reported. The synthesis of the composites, either as three‐dimensional crystals or as thin films at the air–water interface, comprises a two‐step process: 1) The preparation of the Cd salts 6 (Cd), 8 (Cd) or Pb salts 6 (Pb), 8 (Pb) of the oligo(p‐phenyleneethynylene)dicarboxylic acids 6 (H), 8 (H), in which the metal ions are arranged in ribbons and are separated by the long axis of the organic molecules, as demonstrated by X‐ray powder diffraction analysis of the solids and grazing incidence X‐ray diffraction analysis of the films on water. 2) Topotactic solid/gas reaction of these salts with H2S to convert the metal ions into Q‐particles of CdS or PbS embedded in the organic matrix that consists of the acids 6 (H) and 8 (H). These hybrid materials have been characterized by X‐ray photoelectron spectroscopy and transmission electron microscopy.

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Section: Introductionmentioning

confidence: 99%

Hybrid Composites of Monodisperse π-Conjugated Rodlike Organic Compounds and Semiconductor Quantum Particles

et al. 2002

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“…[1][2][3][4] In the past few years, significant progress has been made on these materials, and various approaches have been reported to synthesize inorganic-organic hybrid nanomaterials, such as micelle and microemulsion templates, 5 sol-gel process, 6 sonochemistry, microwave radiation, 7 biomimetic method, 8 LangmuirBlodgett (LB) method, 9 hydrothermal, 2 solvothermal 10 and others. As the representative of these materials, polymer/ metal chalcogenides nanocomposites have been extensively investigated because of their great potential in optoelectronic applications in the fields of light-emitting diodes (LEDs), solar cells, sensors and optical recording materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Optical Characteristics of PAM/HgS Nanocomposites

Qin¹,

Yang²,

Zhang³

et al. 2014

Bulletin of the Korean Chemical Society

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Polyacrylamide (PAM) -HgS nanocomposites were successfully prepared in polyacrylamide (PAM) matrix. From TEM and XRD characterizations, the synthesized HgS nanocrystals were chain-like spherical in shape with a diameter of about 40-60 nm and high crystalline quality. The quantum-confined effect of HgS nanocrystals was confirmed by UV-vis diffuse reflection spectra. The optical properties of products were investigated by using photoluminescence (PL) spectra, which showed that HgS nanocrystals exhibited good optical properties with maximum emission peak at about 640 and 650 nm at different reaction temperatures. The interaction of HgS nanocrystals with PAM was studied through FT-IR spectroscopy and TG analysis, which suggested that Hg 2+ could interact with functional groups of PAM. The experimental results indicated that PAM not only induced nucleation, but also inhibited further growth of HgS crystals and play an important role in the formation of PAM/HgS nanocomposites. In addition, the possible mechanism of HgS nanoparticles growth in PAM solution was also discussed.

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“…It has been reported that hybrid composite of sulfonated polystyrene (PS) matrix was prepared through in situ CdS nanoparticles growing;4 CdS nanoparticles were incorporated into polyacrylamide hydrogel by swelling and shrink cycles to obtain polymeric composite;5 CdS nanocomposite were fabricated on the different polymer matrix such as polyacrylamide,6 dendrimers,7 polymer micelles,8–10 and layer‐by‐layer polyelectrolyte 11. The organic‐inorganic hybrids Langmuir‐Blodgett films were prepared via topotactic gas‐solid reaction with H 2 S 12,13. At the same time, biomacromolecules have been utilized to fabricate CdS nanocomposites, such as the chaperonin proteins wrapping CdS as high thermal and chemical stability semiconductor nanocrystals,14 porous cellulose fibers also have been employed as an effective nanoreactor as well as particle stabilizer for in situ synthesis of metal nanoparticles from metal precursor solution 15,16.…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of CdS/Regenerated Cellulose Nanocomposites

Ruan

Huang

Zhang

2005

Macro Materials & Eng

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Summary: Novel inorganic‐organic hybrid materials composed of cadmium sulfide (CdS) semiconducting nanocrystals and regenerated cellulose (RC) were prepared by using in situ synthesizing method. Cellulose was dissolved in a 6 wt.‐% NaOH/4 wt.‐% urea/thiourea aqueous solution at low temperature followed by addition of cadmium chloride (CdCl2), resulting that the CdS nanocrystals were successfully grown in situ in the cellulose solution. Nanocomposite films containing homogeneous CdS nanoparticles were obtained by casting the resulting solution. Their structure and optical properties were characterized by X‐ray photoelectron spectroscopy, wide‐angle X‐ray diffraction, thermogravimetry analysis, dynamic mechanical analysis, atomic force microscopy, transmittance electronic microscope, UV‐vis spectroscopy, and photoluminescence spectroscopy. The experimental results confirmed that the CdS nanocrystalline existed in the composite films, and cellulose matrix provided a confined medium for CdS particle growth in uniform size. The CdS/RC composites showed narrow emission in photoluminescence spectra, and their optical absorbance in the UV range was higher than that of the cellulose film without CdS. This work provided a simple method to prepare cellulose functional materials in NaOH/urea aqueous solution.

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Phase Transitions and Stabilization of the Organized Hybrid Langmuir-Blodgett Films of Alkanoic Acids/CdS and PbS Q-Particles

Cited by 19 publications

References 2 publications

Hybrid Composites of Monodisperse π-Conjugated Rodlike Organic Compounds and Semiconductor Quantum Particles

Hybrid Composites of Monodisperse π-Conjugated Rodlike Organic Compounds and Semiconductor Quantum Particles

Synthesis and Optical Characteristics of PAM/HgS Nanocomposites

Structure and Properties of CdS/Regenerated Cellulose Nanocomposites

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