Novel conducting nanocomposites: synthesis of triphenylene-covered gold nanoparticles and their insertion into a columnar matrix

Kumar, Sandeep; Pal, Santanu Kumar; Kumar, P. Suresh; Lakshminarayanan, V.

doi:10.1039/b701380a

Cited by 121 publications

(67 citation statements)

References 33 publications

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“…Randomly distributed GNPs ( Figure 6) can form charge transfer complexes when sandwiched between discotic cores, thus enhancing the conductivity of the system. 44 Similar behavior has been observed when triphenylene-based discotics were doped with the electron-deficient trinitrofluorenone molecule. 24 Holt et al 45 observed a similar enhancement (10 6 ) in electrical conductivity in the hexagonal columnar phase of a triphenylene-based DLC upon doping with 1% methylbenzene thiol-covered GNPs.…”

Section: Gnps In Discotic Lcssupporting

confidence: 56%

“…44 Thus, the reduction of gold salt in the presence of thiol-functionalized triphenylene derivative yields discotic-decorated GNPs (Figure 4). In the virgin state, these discoticdecorated GNPs were found to be non-mesomorphic, but they could Remarkably, DC electrical conductivity measurements under ambient conditions show an enhancement of conductivity by six orders of magnitude ( Figure 5) upon doping just 1% of GNPs into DLCs.…”

Section: Gnps In Discotic Lcsmentioning

confidence: 99%

“…44 Shen et al 46 prepared triphenylene-protected GNPs with different spacer lengths and systematically investigated the self-assembled 1-D stripes and hexagonal close packed or disordered organization of GNPs as a function of the size of GNPs, alkyl chain lengths, interparticle p-p interaction and solvent hydrophilicity (Figure 7).…”

Section: Gnps In Discotic Lcsmentioning

confidence: 99%

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Discotic liquid crystal-nanoparticle hybrid systems

Kumar

2014

NPG Asia Mater

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Discotic liquid crystals (DLCs) are nanomaterials with sizes ranging from 2 to 6 nm, and they are emerging as one-dimensional organic semiconducting materials. Recently, hybridization of these materials with various metallic and semiconducting nanoparticles (NPs) to alter and improve their properties has been realized. This article provides an overview of the developments in the field of newly immersed discotic nanoscience, a sub-field of liquid crystal (LC) nanoscience. As this field is also of great interest to readers without an LCs background, a brief introduction of the LC field is given first, with special emphasis on DLCs. This is followed by various DLC-NP hybrid systems. Finally, an outlook into the future of this newly emerging, fascinating and exciting field of discotic nanoscience research is provided.

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Section: Gnps In Discotic Lcssupporting

confidence: 56%

Section: Gnps In Discotic Lcsmentioning

confidence: 99%

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Discotic liquid crystal-nanoparticle hybrid systems

Kumar

2014

NPG Asia Mater

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“…57 In another innovative approach, we realized that the conductivity of DLCs can be enhanced by several orders of magnitude by dispersing a very small amount of metallic, semiconducting or carbon nanoparticles. [58][59][60][61][62][63][64][65][66][67] Since the discovery of DLCs, there has been tremendous interest in utilizing these materials as one-dimensional semiconductors. Conducting and photoconducting properties of DLCs have been studied extensively.…”

Section: Liquid Crystals In Photovoltaics M Kumar and S Kumarmentioning

confidence: 99%

Liquid crystals in photovoltaics: a new generation of organic photovoltaics

Kumar

2016

Polym J

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140

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This article presents an overview of the developments in the field of organic photovoltaics (PVs) with liquid crystals (LCs). A brief introduction to the PV and LC fields is given first, followed by application of various LCs in organic PVs. Details of LCs used in bilayer solar cells, bulk heterojunction solar cells and dye-sensitized solar cells have been given. All the liquid crystalline materials used in PVs are structured and the efficiency of solar cells is tabulated. Finally, an outlook into the future of this newly emerging, fascinating and exciting field of self-organizing supramolecular LC PV research is provided. Polymer Journal (2017) 49, 85-111; doi:10.1038/pj.2016.109; published online 9 November 2016 INTRODUCTIONFor the sustainable growth of the global economy, availability of cheap energy is essential. Our energy demand is increasing continuously to improve our lifestyle. At present, fossil energy sources are the primary sources for most of the world's current energy requirements and only a little is provided by hydropower, nuclear energy and biomass. The exponential growth of carbon dioxide level in the atmosphere owing to the burning of fossil fuels is leading to the threat of a universal climate change. Moreover, there will be limited availability of conventional energy sources in the long term. Future energy demand cannot be met with conventional sources of energy. Nuclear energy sources are one of the promising energy sources, but owing to their associated hazardousness and cost effectiveness, these energy sources does not appear to be socially acceptable universally. Moreover, nuclear fuel is also limited to tackle gigantic demand of energy. Despite several efforts, the problem of energy provision around the world remains unsolved, and there is a great need of finding alternative clean energy sources. To solve the energy crisis of the globe, exploitation of solar energy is undoubtedly the best answer. It is the most abundant inexhaustible source of regenerative energy. It is known since the evolution of life on the Earth that Mother Nature generates chemical energy from solar energy via photosynthesis. The supply of energy by Sun on Earth in an hour is more than that we use in a year. Therefore, only a fraction of solar energy is required to overcome our all energy requirements, if it can be converted to electric energy efficiently. The device that is developed to convert solar energy into electrical energy is known as photovoltaic (PV) solar cell.During the past 60 years, PV energy has been used as a promising candidate for energy devices because it is abundant, inexhaustible, cheap, straight to production ability and pollution-free that does not raise the green-house gases. The PV effect involves the generation of a photocurrent and photovoltage on absorption of light photons in a semiconductor. The three-step process, which is an

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“…The PR grating with a period of about 410 nm was fabricated on glass substrate with a 200-nm layer of indium tin oxide (ITO), where the ITO layer also acts as a waveguide. Chemically synthesized gold nanoparticles [15,16] with a diameter ranging from 5 to 10 nm, which were suspended in xylene with a concentration of 100 mg/mL, were then spin-coated onto the top surface of the grating. In the spin-coating process, a 30-μL colloidal solution of gold was spin-coated at a speed of 2000 rpm.…”

Section: Fabrication and Characterization Of The Plasmonic Gold Nanowmentioning

confidence: 99%

Ultrafast Optical Heating Induced Polarization-Dependent Optical Switching in Gold Nanowires

Wang¹,

Fang²

2017

Applied Sciences

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Excitation using femtosecond laser pulses induced ultrafast heating of discontinuous gold nanowires, resulting in transient thermal expansion of the gold nanostructures that constitute the nanowires. The cross-plasmon resulting from the closely arranged gold nanostructures along the nanowires was modified by the change in the small gaps due to the thermal effect. This led to the spectral shift of the cross-plasmon resonance and laid the photophysical basis for the optical switching. A femtosecond pump-probe scheme was used to investigate the ultrafast optical switching dynamics. The most efficient optical switching effect was observed when the pump and probe laser pulses were polarized perpendicular and parallel to the discontinuous gold nanowires, respectively.

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Novel conducting nanocomposites: synthesis of triphenylene-covered gold nanoparticles and their insertion into a columnar matrix

Cited by 121 publications

References 33 publications

Discotic liquid crystal-nanoparticle hybrid systems

Discotic liquid crystal-nanoparticle hybrid systems

Liquid crystals in photovoltaics: a new generation of organic photovoltaics

Ultrafast Optical Heating Induced Polarization-Dependent Optical Switching in Gold Nanowires

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