The Experts below are selected from a list of 39138 Experts worldwide ranked by ideXlab platform
Albert G Nasibulin - One of the best experts on this subject based on the ideXlab platform.
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machine learning for tailoring optoelectronic properties of single walled Carbon Nanotube films
Journal of Physical Chemistry Letters, 2019Co-Authors: Eldar M Khabushev, Dmitry V Krasnikov, Orysia T Zaremba, Alexey P Tsapenko, Anastasia E Goldt, Albert G NasibulinAbstract:A machine learning technique, namely, support vector regression, is implemented to enhance Single-Walled Carbon Nanotube (SWCNT) thin-film performance for transparent and conducting applications. W...
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hybrid Carbon source for single walled Carbon Nanotube synthesis by aerosol cvd method
Carbon, 2014Co-Authors: Ilya V Anoshkin, Albert G Nasibulin, Hua Jiang, Ying Tian, Bilu Liu, Esko I KauppinenAbstract:Abstract The conductivity enhancement of Single-Walled Carbon Nanotube (SWCNT) films was achieved by increasing the bundle length in an aerosol CVD synthesis method with the help of two Carbon sources. Carbon monoxide provides Carbon at temperatures below 900 °C, while ethylene takes over at higher temperatures. The significant decrease in the sheet resistance at the 90% transmittance was observed from 3500 to 7500 Ω/sq. for pure CO system via 1909 and 1709 Ω/sq. for CO–H2 system to 291 and 358 Ω/sq. in the presence of C2H4 at 900 and 1100 °C, respectively. Doping the film with a gold chloride solution in acetonitrile allowed us to create the transparent conductive films with the sheet resistance as low as 73 Ω/sq. at a transmittance of 90%.
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multifunctional free standing single walled Carbon Nanotube films
ACS Nano, 2011Co-Authors: Albert G Nasibulin, Antti Kaskela, Virginia Ruiz, Kimmo Mustonen, Anton S Anisimov, S Kivisto, Simas Rackauskas, Marina Y Timmermans, Marko Pudas, Brad AitchisonAbstract:We report a simple and rapid method to prepare multifunctional free-standing Single-Walled Carbon Nanotube (SWCNT) films with variable thicknesses ranging from a submonolayer to a few micrometers having outstanding properties for a broad range of exceptionally performing devices. We have fabricated state-of-the-art key components from the same single component multifunctional SWCNT material for several high-impact application areas: high efficiency nanoparticle filters with a figure of merit of 147 Pa−1, transparent and conductive electrodes with a sheet resistance of 84 Ω/◻ and a transmittance of 90%, electrochemical sensors with extremely low detection limits below 100 nM, and polymer-free saturable absorbers for ultrafast femtosecond lasers. Furthermore, the films are demonstrated as the main components in gas flowmeters, gas heaters, and transparent thermoacoustic loudspeakers.
G Gruner - One of the best experts on this subject based on the ideXlab platform.
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microwave shielding of transparent and conducting single walled Carbon Nanotube films
Applied Physics Letters, 2007Co-Authors: Steven M Anlage, G GrunerAbstract:The authors measured the transport properties of Single-Walled Carbon Nanotube (SWCNT) films in the microwave frequency range from 10MHzto30GHz by using the Corbino reflection technique from temperatures of 20–400K. Based on the real and imaginary parts of the microwave conductivity, they calculated the shielding effectiveness for various film thicknesses. Shielding effectiveness of 43dB at 10MHz and 28dB at 10GHz are found for films with 90% optical transmittance, which suggests that SWCNT films are promising as a type of transparent microwave shielding material. By combining their data with those from the literature, the conductivity of SWCNT films was established in a broad frequency range from dc to visible.
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electrowetting devices with transparent single walled Carbon Nanotube electrodes
Applied Physics Letters, 2007Co-Authors: G Gruner, Jian Gong, Changjin Cj Kim, Bjoern HornbostelAbstract:Microfluidic devices based on the electrowetting principle, more specifically electrowetting on dielectric, were fabricated using transparent Single-Walled Carbon Nanotube films as electrodes. The films were spray coated on glass and polyethylene terephalate substrates. The transmittance and sheet resistance remain unchanged after patterning the films using typical photolithography and plasma etching. Operation of water droplets over the patterned Nanotube electrodes was demonstrated, and the performance was found to be comparable to that over the usual metal electrodes. The requirement of transparent electrodes is estimated for displays based on electrowetting machanism, and Nanotube films indicate promise for such a type of devices.
Fabian Rotermund - One of the best experts on this subject based on the ideXlab platform.
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single walled Carbon Nanotube saturable absorber assisted high power mode locking of a ti sapphire laser
Optics Express, 2011Co-Authors: In Hyung Baek, Sun Young Choi, Hwang Woon Lee, Won Bae Cho, Valentin Petrov, Antonio Agnesi, Valdas Pasiskevicius, Dongil Yeom, Kihong Kim, Fabian RotermundAbstract:We report on passive mode-locking of a Ti:sapphire laser employing a Single-Walled Carbon Nanotube saturable absorber (SWCNT-SA) specially designed and fabricated for wavelengths near 800 nm. Mode-locked pulses as short as 62 fs were generated at a repetition rate of 99.4 MHz. We achieved output powers from the SWCNT-SA mode-locked laser as high as 600 mW with a slope efficiency of 26%. The characteristics of SWCNT-SA-assisted mode-locking were compared with those of Kerr-lens mode-locking without SWCNT-SA.
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mode locked self starting cr forsterite laser using a single walled Carbon Nanotube saturable absorber
Optics Letters, 2008Co-Authors: Won Bae Cho, Sun Young Choi, Valentin Petrov, Jong Hyuk Yim, Soonil Lee, Uwe Griebner, Fabian RotermundAbstract:We report what we believe to be the first passive mode-locking of Cr:forsterite laser using a Single-Walled Carbon Nanotube saturable absorber (SWCNT-SA). The dispersion-compensated Cr:forsterite laser in a self-starting configuration produces nearly Fourier transform-limited pulses as short as 120 fs near 1.25 μm. The maximum average output power of 202 mW obtained with a 5% output coupler at a repetition rate of 79.1 MHz represents, to the best of our knowledge, the highest power level ever reported for SWCNT-SA mode locking of solid-state lasers.
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passive mode locking of yb kluw using a single walled Carbon Nanotube saturable absorber
Optics Letters, 2008Co-Authors: Andreas Schmidt, Won Bae Cho, Fabian Rotermund, S Rivier, G Steinmeyer, Jong Hyuk Yim, Soonil Lee, M C Pujol, Xavier Mateos, Magdalena AguiloAbstract:Mode locking of an Yb-doped bulk laser in the 1 μm spectral range using a Single-Walled Carbon Nanotube saturable absorber (SWCNT-SA) is demonstrated for the first time, to our knowledge. Passive mode locking of an Yb:KLuW laser resulted in nearly transform-limited pulses as short as 115 fs at 1048 nm. In addition, the nonlinear response of the SWCNT-SA was measured, yielding a modulation depth of 0.25% and a relaxation time of 750 fs.
Jun Chen - One of the best experts on this subject based on the ideXlab platform.
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compact designed supercapacitors using free standing single walled Carbon Nanotube films
Energy and Environmental Science, 2011Co-Authors: Zhiqiang Niu, Yan Ren, Jun Chen, Haibo Dong, Weiya Zhou, Guoxing Feng, D X Zhao, Sishen XieAbstract:We reported the realization of assembling compact-designed supercapacitors using large-scaled free-standing and flexible Single-Walled Carbon Nanotube (SWCNT) films as both anode and cathode. A prototype of the processing procedures was developed to obtain the uniform spreading of the SWCNT films onto the separators serving as both electrodes and charge collectors without metallic current collectors, leading to a simplified and lightweight architecture. The area of SWCNT film on a separator can be scaled up and its thickness can be extended. High energy and power densities (43.7 Wh kg−1 and 197.3 kW kg−1, respectively) were achieved from the prepared SWCNT film-based compact-designed supercapacitors with small equivalent series resistance. The specific capacitance of this kind of compact-designed SWCNT film supercapacitor is about 35 F g−1. These results clearly show the potential application of free-standing SWCNT film in compact-designed supercapacitor with enhanced performance and significantly improved energy and power densities.
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single walled Carbon Nanotube reinforced copper composite coatings prepared by electrodeposition under ultrasonic field
Materials Letters, 2008Co-Authors: C. S. He, J. N. Deng, Y.l. Yang, Jun Chen, Y. D. WangAbstract:Single-Walled Carbon Nanotube-reinforced Cu composite coatings prepared by electrochemical deposition under ultrasonic field exhibit smaller crystallite size and higher lattice micro-strain compared with a pure Cu coating. The as-deposited coatings retain a good electrical conductivity comparable to pure copper and simultaneously show a significant enhancement in mechanical properties. This indicates that the present electrochemical deposition technique can be used for preparing the Carbon Nanotube-reinforced metals with enhanced mechanical and functional properties.
Beckry Abdelmagid - One of the best experts on this subject based on the ideXlab platform.
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thermal behavior of single walled Carbon Nanotube polymer matrix composites
Composites Part A-applied Science and Manufacturing, 2006Co-Authors: Yunsheng Xu, Beckry AbdelmagidAbstract:Abstract Single-Walled Carbon Nanotube (SWNT)–poly(vinylidene fluoride) (PVDF) composites were fabricated by dispersion of SWNT in an aqueous surfactant solution, followed by mixing with PVDF powder, filtration and hot pressing. The thermal properties of the composites at various SWNT volume fraction up to 49% were investigated. The coefficient of thermal expansion (CTE) was decreased with increase of the SWNT content. The thermal conductivity increased with temperature in the temperature range from 25 to 150 °C. The thermal conductivity was enhanced, but not up to the level required by heat sink applications. The melting point was not affected significantly by the addition of SWNT, but the degree of crystallinity was increased and the decomposition temperature of the matrix was decreased. The large number of junctions among SWNT largely offsets the benefit of the high thermal conductivity of SWNT. In addition, the impurity and defects in SWNT are believed to limit the thermal conductivity of the composites. Lastly, the reduced thermal stability of the composite compared to the matrix might result from the presence of the metal catalyst contained in the SWNT.
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thermal behavior of single walled Carbon Nanotube polymer matrix composites
Composites Part A-applied Science and Manufacturing, 2006Co-Authors: Gunawidjaja Ray, Beckry AbdelmagidAbstract:Abstract Single-Walled Carbon Nanotube (SWNT)–poly(vinylidene fluoride) (PVDF) composites were fabricated by dispersion of SWNT in an aqueous surfactant solution, followed by mixing with PVDF powder, filtration and hot pressing. The thermal properties of the composites at various SWNT volume fraction up to 49% were investigated. The coefficient of thermal expansion (CTE) was decreased with increase of the SWNT content. The thermal conductivity increased with temperature in the temperature range from 25 to 150 °C. The thermal conductivity was enhanced, but not up to the level required by heat sink applications. The melting point was not affected significantly by the addition of SWNT, but the degree of crystallinity was increased and the decomposition temperature of the matrix was decreased. The large number of junctions among SWNT largely offsets the benefit of the high thermal conductivity of SWNT. In addition, the impurity and defects in SWNT are believed to limit the thermal conductivity of the composites. Lastly, the reduced thermal stability of the composite compared to the matrix might result from the presence of the metal catalyst contained in the SWNT.
