Charge Carrier Transport in Poly(<i>N</i>-vinylcarbazole):CdS Quantum Dot Hybrid Nanocomposite

Choudhury, Kaushik Roy; Samoć, Marek; Patra, and Amitava; Prasad, Paras N.

doi:10.1021/jp0360671

Cited by 91 publications

(59 citation statements)

References 46 publications

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“…9 Further, it is expected that poly-NVCz can be used to realize a hologram memory material because of the high refractive index (>1.68) of its monomer. 10 As mentioned above, it is essential to control the molecular orientation and arrangement at the monomolecular level in order to drive the functionality of these organic molecular devices in an efficient manner.…”

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confidence: 99%

Morphological Transition from Nanosheet to Nanosphere in Ternary Comb Copolymers with Carbazole Rings

Kaneko¹,

Fujimori²

2012

Chemistry Letters

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The transition behavior of ternary comb copolymers containing carbazole rings from a monolayer on a water surface to a single particle layer has been investigated by surface pressurearea isotherms and atomic force microscopy. It has been found that these copolymers form a monolayer in the lowsurface-pressure region and a single particle layer in the highsurface-pressure region.Organized molecular films 1 fabricated using functional polymers with precisely controlled structures can be developed as candidates for biomimetic models 2 and molecular electronic devices, 3 which have attracted considerable interest in fundamental science, as well as for their potential applications. Generally, it is well known that crystalline polymers form hierarchical structures from lamellae on the nanometer scale to spherulite on the mesoscopic scale. 4 Crystals in these crystalline polymers are generally formed by the folding of the main chain, although there are two types of structural characteristics for side-chain crystalline ternary comb polymers. It is known that ternary comb polymers, which have long n-alkyl side chains with crystallization ability attached to an amorphous main chain, are packed into a layer structure along the c axis and subcell of the side chains in the ab plane.5 This "subcell" structure 6 of the side chain is formed as a two-dimensional lattice, and the "layer structure" along the c axis often reflects the long spacing between the main chains in the accumulated double-layer structures. With regard to the industrial application of these ternary comb polymers, poly(octadecyl)-based materials that utilize cocrystallization with another hydrocarbon to incorporate the material into the same crystalline lattice have found numerous applications such as pour-point depressants for lubricating oils or fuels, rheological modifiers, additives for petroleum products, and smart gels. 7On the other hand, in recent years, many researchers have attempted to utilize poly(N-vinylcarbazole) (poly-NVCz) as organic light-emitting diodes, organic transistors, and host compounds for organic electroluminescence 8 because it is well known that poly-NVCz exhibits properties identical to those of organic semiconductors.9 Further, it is expected that poly-NVCz can be used to realize a hologram memory material because of the high refractive index (>1.68) of its monomer. 10As mentioned above, it is essential to control the molecular orientation and arrangement at the monomolecular level in order to drive the functionality of these organic molecular devices in an efficient manner. However, in many cases, it is difficult to control the molecular arrangement and homopolymer packing because poly-NVCz itself easily forms an amorphous polymer. 11In a previous study, we investigated the control of solid-state structures and the formation of organized films for newly synthesized comb copolymers containing hydrogenated and fluorinated side chains.12 These comb polymers form a sidechain crystal in the bulk state via van der Waals interactions b...

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confidence: 99%

Morphological Transition from Nanosheet to Nanosphere in Ternary Comb Copolymers with Carbazole Rings

Kaneko¹,

Fujimori²

2012

Chemistry Letters

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“…The corrosion protection offered by selfassembled films of carbazole on copper (Cu) in NaCl solution were recently studied [16]. Exploring the literature confirms that the incorporation of various nanoparticles into PVK matrix enhances properties like antimicrobial [17], charge carrier transport [18], super capacitance [19], photoconductivity [20], optical [21], electrical conductance [22], thermal stability [23] and electrochemical [24]. It is evident from the literature that few investigations were carried out in the past to validate the corrosion protection offered by the PVK nano composite films on steels.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Anticorrosive Properties of Novel PVK-ZrO<sub>2 </sub>Nano Composite Coatings on Steel-Substrate

Elangovan

Pugalmani

Arthanari

et al. 2018

e-J. Surf. Sci. Nanotech.

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A novel nanocomposite coating containing poly (N -vinyl carbazole) (PVK) and zirconia (ZrO2) nanoparticles was synthesized using chronoamperometry. The effect of ZrO2 nano particles into the PVK matrix and its mechanical, corrosion protection ability on 316L SS substrates were studied. The incorporation of the nanoparticles was endorsed by attenuated total reflectance infrared spectroscopy (ATR-IR) and EDAX analysis. The spheroidal morphology and core-shell structure were revealed with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The thermal studies exhibited the stability of coating. The anticorrosion performance of PVK-ZrO2 nanocomposite coatings in 3.5 weight (wt.)% NaCl medium was performed with potentiodynamic polarization technique and electrochemical impedance spectroscopy (EIS) studies. The corrosion rate of PVK-ZrO2 nanocomposite coated 316L SS was found to be 0.58 times lower than uncoated 316L SS and a significant decrease in corrosion potential was realized from −0.211 VSCE for uncoated 316L SS to 0.112 VSCE for PVK-ZrO2 nanocomposite coated 316L SS substrates. The results of this study clearly ascertain that the PVK-ZrO2 nanocomposite has an outstanding potential to protect 316L SS against corrosion in a 3.5 wt.% NaCl environment.

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“…8 Further, it is expected that poly-NVCz can be used to realize a hologram memory material because of the high refractive index (greater than 1.68) of its monomer.…”

Section: Introductionmentioning

confidence: 99%

Elucidation of Internal Fine Structure of "Polymer Nanosphere" in the Interfacial Particle Film

Kikkawa

Kaneko

Fujimori

2014

Trans. Mat. Res. Soc. Japan

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Transition behavior from a monolayer on the water surface to a single particle layer of a ternary comb copolymer with highly hydrophobic carbazole units and both hydrogenated and fluorinated side-chains have been investigated by surface pressure−area (π−A) isotherm and atomic force microscopic (AFM) observation. Moreover, we fabricated a polymer nanosphere multilayered organization consisting of such polymer nanoparticles by the Langmuir-Blodgett (LB) technique, and estimated the particle arrangement by performing out-of-plane X-ray diffraction (XRD) analysis. This polymer monolayer is able to form the polymer nanosheet with amorphous layers. The multiparticle layered organization of polymer nanosphere is fabricated from the single particle layer by the LB technique. These layer structures have highly regular arrangement along the c-axis. Further, we investigated molecular arrangement inside of polymer particles by performing in-plane XRD analysis and fluorescence spectroscopy. This copolymer formed side-chain crystals inside the particles. Fluorocarbon chains had a short spacing of 5.0 Å for the two-dimensional side-chain lattice whereas hydrocarbon chains formed sub-cell at short spacing of 4.2 Å. In addition, aggregated structure of carbazole rings is formed by π-π interaction.

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Charge Carrier Transport in Poly(N-vinylcarbazole):CdS Quantum Dot Hybrid Nanocomposite

Cited by 91 publications

References 46 publications

Morphological Transition from Nanosheet to Nanosphere in Ternary Comb Copolymers with Carbazole Rings

Morphological Transition from Nanosheet to Nanosphere in Ternary Comb Copolymers with Carbazole Rings

Synthesis and Anticorrosive Properties of Novel PVK-ZrO<sub>2 </sub>Nano Composite Coatings on Steel-Substrate

Elucidation of Internal Fine Structure of "Polymer Nanosphere" in the Interfacial Particle Film

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