Organic light emitting diodes fabricated with single wall carbon nanotubes dispersed in a hole conducting buffer: the role of carbon nanotubes in a hole conducting polymer

Woo, Hyung-Suk; Czerw, R.; Webster, S.; Carroll, D. L.; Park, J.W; Lee, J.H

doi:10.1016/s0379-6779(00)00439-2

Cited by 157 publications

(42 citation statements)

References 14 publications

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“…The cyclic voltammogram of ZnO-PANI exhibited a pair of reversible redox peaks at 0.14 and 0.7 V. The peak centered at 0.14 V is attributed to oxidation of the emeraldine form of PANI, whereas the peak at 0.7 V is due to the pernigraniline form of PANI (otherwise known as protonation of PANI). 31 However, the peak at À0.5 V can be attributed to the oxidation of ZnO in the acidic medium. Interestingly, from Figure 7b, it is obvious that the ZnO-PANI nanocomposite exhibited distinct redox peaks of ZnO (at À0.5 V) and PANI (at 0.14 and 0.7 V) because of the incorporation of PANI into ZnO.…”

Section: Properties Of Zno-pani Films F Alvi Et Almentioning

confidence: 99%

Evaluating the chemio-physio properties of novel zinc oxide–polyaniline nanocomposite polymer films

Alvi

Ram

Gómez

et al. 2010

Polym J

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Recently, polymer matrix-based nanocomposites have become a prominent area of research and development in optics, as well as in optoelectronic, biomedical, electrical and electronic applications. Organic polymer-based electronic devices have the potential to be lower in cost and more flexible in the manner in which they are manufactured. However, they need significant improvement in both efficiency and long-term stability. Therefore, we made an attempt to synthesize zinc oxide (ZnO)-polyaniline (PANI) using chemical and emulsion polymerization techniques. The properties of ZnO-PANI films were then systematically characterized with several physical techniques. Electrochemical investigations revealed that the individual redox properties of ZnO and PANI can be maintained in a nanocomposite ZnO-PANI system. Furthermore, our results indicated that ZnO-PANI films can exhibit a wide redox potential window. Moreover, we observed the formation of a single-layer nano-Schottky junction in ZnO-PANI films, and interesting positive temperature coefficient properties in ZnO-PANI-embedded polystyrene films. Polymer Journal ( INTRODUCTIONIn recent years, there has been considerable interest among researchers to develop novel inorganic _ organic hybrid materials with compositions modulated on the nanoscale because of their many potential applications in display technologies, microelectronics, catalysis, sensors and molecular electronics. 1 The fabrication of nanocomposite films by wet chemical techniques has been proven to be a more simple and inexpensive strategy than technologically demanding physical methods. 2 Recently, Ram et al. [3][4][5][6][7][8] developed metal oxide and conducting polymer nanocomposite films of TiO 2 -PANI, TiO 2 -polypyrrole, SnO 2 -polyhexylthiophene, TiO 2 -poly (thiopheneaniline) nanocomposite, Mn-Ferrite-PANI and MWCNT-poly (o-anisidine) using wet chemical methods and used them extensively in gas sensing and molecular electronics applications. PANI is one of the most widely studied materials because of its unique electrochemical, chemical and physical properties. In addition, PANI exhibits high electrical conductivity and good environmental stability in both doped and pristine (undoped) states. 9-11 The electronic, optical, photo-electrochemical, photoconductive, photovoltaic, thermal and sensing, for example, gas sensing and biosensing, properties of PANI could be improved by incorporating PANI with polystyrene latex, multiwalled carbon nanotubes, single-walled nanotubes, montmorillonite, graphite, MCM-41, TiO 2 and SnO 2 micro and nanoparticles. 9-18 PANI composites have also been shown to possess a variety of unique mechanical, electrical and structural properties because of synergistic effect from intimate mixing

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Section: Properties Of Zno-pani Films F Alvi Et Almentioning

confidence: 99%

Evaluating the chemio-physio properties of novel zinc oxide–polyaniline nanocomposite polymer films

Alvi

Ram

Gómez

et al. 2010

Polym J

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“…The doping alters the electronic structures of the CNTs by charge transfer. This effect, therefore, influences the optoelectronic properties of the SWCNTs [108] because the band gap of the CNT is reduced to form the metallic CNTs with a high catalytic activity [109] (Figure 5). The pyridine-like N structures of the N-CNTs are found responsible for the metallic behavior and express the prominent features near the Fermi level.…”

Section: Electrochemical Modificationmentioning

confidence: 99%

“…The pyridine-like N structures of the N-CNTs are found responsible for the metallic behavior and express the prominent features near the Fermi level. These electronrich structures behave as the n-type nanotubes and are the good examples for the real molecular heterojunction devices [109]. The specific capacitance of the nitrogendoped CNT electrode is also higher than that of the pure CNT electrode after cycling [112] because, as an electrode material for the electrochemical capacitors, the nitrogen functional groups contribute to the pseudo-Faradic capacitance [113].…”

Section: Electrochemical Modificationmentioning

confidence: 99%

Synthesis and electrochemical applications of nitrogen-doped carbon nanomaterials

Majeed¹,

Zhao²,

Zhang³

et al. 2013

Nanotechnology Reviews

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Abstract:Nitrogen doping is an effective way to tailor the properties of the shaped carbon materials, including the nanotubes, nanocups, nanofibers, as well as the nanorods, and render their potential use for various applications. The common bonding configurations obtained on the N insertion is the pyridinic N and pyrrolic N, which impart the characteristic properties to these carbon materials. This review will focus on the nitrogen-doped carbon materials, the doping effect on the electrochemistry of the doped nanomaterials, and the various synthetic methods to introduce N into the carbon network. The potential applications of the N-doped materials are also reviewed on the basis of the experimental and theoretical studies in electrochemistry.

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“…In order to reach high EL efficiencies in optoelectronic devices, efficient injection of both carrier types is required, as well as their balanced recombination. [6,7] Due to these requirements, the fabrication of truly efficient devices often requires the use of elaborately designed materials and complicated device structures. These structures are often comprised of multiple layers that mediate charge injection, charge blocking, and charge-transport in the device.…”

mentioning

confidence: 99%

“…This, in turn, may cause either a blue-or redshift, depending on the energy level of the specific dye. [5,6,12,25] It should be noted that the concentration of MWNTs and their distribution in the films must be carefully optimized. A low concentration will result in an inefficient charge injection, whereas high MWNT concentrations are expected to lead to PL and EL quenching accompanied by percolation.…”

mentioning

confidence: 99%

Controlled Electroluminescence from Films Composed of Mixed Bio‐Composites and Nanotubes

et al. 2013

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Good things come in threes: A new type of light emitting bio-composites allowing for the nanometric separation of the active components is demonstrated. A protein with large host-guest capacities is used for the encapsulation of a water-soluble composite dye in a nano-sized shell, which efficiently reduces Förster resonance energy transfer and related mechanisms. Blending of this bio-composite with multi-walled nanotubes increases the charge injection efficiency, in the electro-luminescent device.

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Organic light emitting diodes fabricated with single wall carbon nanotubes dispersed in a hole conducting buffer: the role of carbon nanotubes in a hole conducting polymer

Cited by 157 publications

References 14 publications

Evaluating the chemio-physio properties of novel zinc oxide–polyaniline nanocomposite polymer films

Evaluating the chemio-physio properties of novel zinc oxide–polyaniline nanocomposite polymer films

Synthesis and electrochemical applications of nitrogen-doped carbon nanomaterials

Controlled Electroluminescence from Films Composed of Mixed Bio‐Composites and Nanotubes

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