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https://www.readbyqxmd.com/read/28821825/giant-modulation-of-the-electronic-band-gap-of-carbon-nanotubes-by-dielectric-screening
#1
Lee Aspitarte, Daniel R McCulley, Andrea Bertoni, Joshua O Island, Marvin Ostermann, Massimo Rontani, Gary A Steele, Ethan D Minot
Carbon nanotubes (CNTs) are a promising material for high-performance electronics beyond silicon. But unlike silicon, the nature of the transport band gap in CNTs is not fully understood. The transport gap in CNTs is predicted to be strongly driven by electron-electron (e-e) interactions and correlations, even at room temperature. Here, we use dielectric liquids to screen e-e interactions in individual suspended ultra-clean CNTs. Using multiple techniques, the transport gap is measured as dielectric screening is increased...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821765/the-protective-action-of-osmolytes-on-the-deleterious-effects-of-gamma-rays-and-atmospheric-pressure-plasma-on-protein-conformational-changes
#2
Pankaj Attri, Minsup Kim, Thapanut Sarinont, Eun Ha Choi, Hyunwoong Seo, Art E Cho, Kazunori Koga, Masaharu Shiratani
Both gamma rays and atmospheric pressure plasma are known to have anticancer properties. While their mechanism actions are still not clear, in some contexts they work in similar manner, while in other contexts they work differently. So to understand these relationships, we have studied Myoglobin protein after the treatment of gamma rays and dielectric barrier discharge (DBD) plasma, and analyzed the changes in thermodynamic properties and changes in the secondary structure of protein after both treatments. The thermodynamic properties were analyzed using chemical and thermal denaturation after both treatments...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821718/high-energy-storage-density-over-a-broad-temperature-range-in-sodium-bismuth-titanate-based-lead-free-ceramics
#3
Haibo Yang, Fei Yan, Ying Lin, Tong Wang, Fen Wang
A series of (1-x)Bi0.48La0.02Na0.48Li0.02Ti0.98Zr0.02O3-xNa0.73Bi0.09NbO3 ((1-x)LLBNTZ-xNBN) (x = 0-0.14) ceramics were designed and fabricated using the conventional solid-state sintering method. The phase structure, microstructure, dielectric, ferroelectric and energy storage properties of the ceramics were systematically investigated. The results indicate that the addition of Na0.73Bi0.09NbO3 (NBN) could decrease the remnant polarization (P r ) and improve the temperature stability of dielectric constant obviously...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820594/on-the-restrained-proton-indicator-in-combined-quantum-mechanics-molecular-mechanics-dynamics-simulations-of-proton-transfer-through-a-carbon-nanotube
#4
Adam W Duster, Hai Lin
Recently, a collective variable "proton indicator" was purposed for tracking an excess proton solvated in bulk water in molecular dynamics simulations. In this work, we demonstrate the feasibility of utilizing the position of this proton indicator as a reaction coordinate to model an excess proton migrating through a hydrophobic carbon nanotube in combined quantum-mechanics/molecular-mechanics simulations. Our results indicate that applying a harmonic restraint to the proton indicator in the bulk solvent near the nanotube pore entrance leads to the recruitment of water molecules into the pore...
August 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28820573/magnetically-aligned-co-c-mwcnts-composite-derived-from-mwcnts-interconnected-zeolitic-imidazolate-frameworks-for-lightweight-and-highly-efficient-electromagnetic-wave-absorber
#5
Yichao Yin, Xiaofang Liu, Xiaojun Wei, Ya Li, Xiaoyu Nie, Ronghai Yu, Jianglan Shui
Developing lightweight and highly efficient electromagnetic wave (EMW) absorbing materials is crucial but challenging for anti-electromagnetic irradiation and interference. Herein, we used MWCNTs as templates for growth of Co-based zeolitic imidazolate frameworks (ZIFs), and obtained Co-C/MWCNTs composite by post pyrolysis. The MWCNTs interconnected the ZIF-derived Co-C porous particles, constructing a conductive network for electron hopping and migration. Moreover, the Co-C/MWCNTs composite was aligned in paraffin matrix under an external magnetic field, which led to the stretch of MWCNTs along the magnetic field direction...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28820465/vertical-strip-fed-broadband-circularly-polarized-dielectric-resonator-antenna
#6
Amir Altaf, Jin-Woo Jung, Youngoo Yang, Kang-Yoon Lee, Keum Cheol Hwang
A vertical-strip-fed dielectric resonator antenna exhibiting broadband circular polarization characteristics is presented. A broad 3 dB axial ratio bandwidth (ARBW) is achieved by combining multiple orthogonal modes due to the use of a special-shaped dielectric resonator. The proposed antenna is fabricated to evaluate its actual performance capabilities. The antenna exhibits a measured 3 dB ARBW of 44.2% (3.35-5.25 GHz), lying within a -10 dB reflection bandwidth of 82.7% (2.44-5.88 GHz). The measured peak gain within 3 dB ARBW is found to be 5...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28820424/observation-of-self-polarization-in-the-bsa-protected-au20-clusters
#7
Deepak Kumar Swain, Alongbar Narzary, Anil Singh, Amreesh Chandra, T Nagasawa, S Yamamoto, Masaya Mitsuishi, S Rath
The bovine serum albumin (BSA) protected gold clusters (atomicity ~ 20), prepared using a wet chemical route, show a strong dipolar radiative transition with gap energy of 1.93 eV due to the high oscillator strength as confirmed from the emission studies. Self-arrangement of the clusters having fixed atomicity yields a low dispersive dielectric and electric self-polarization nature. The electrical hysteresis loop measurements returned a remanent polarization as 0.05 µC/cm2 which can be correlated with dipolar orientation (activation energy ~ 45...
August 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28820212/self-rectifying-bipolar-resistive-switching-memory-based-on-an-iron-oxide-and-graphene-oxide-hybrid
#8
Se-I Oh, Janardhanan R Rani, Sung-Min Hong, Jae-Hyung Jang
A resistive random access memory (RRAM) device with self-rectifying I-V characteristics was fabricated by inserting a silicon nitride (Si3N4) layer between the bottom electrode and solution-processed active material of an iron oxide-graphene oxide (FeOx-GO) hybrid. The fabricated Au/Ni/FeOx-GO/Si3N4/n(+)-Si memory device exhibited an excellent resistive switching ratio and a rectification ratio higher than 10(4). In the Au/Ni/FeOx-GO/Si3N4/n(+)-Si device, resistive switching occurs in both the FeOx-GO and Si3N4 layers separately, resulting in a highly uniform and stable switching performance...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820198/dark-excitons-and-tunable-optical-gap-in-graphene-nanodots
#9
Yingjie Zhang, Weidong Sheng, Yang Li
By using a configuration interaction approach with up to the fifth excitations taken into account, we study the excitonic effect in the optical absorption in graphene nanodots. While the many-electron states are either singlet or doublet in a triangular nanodot system, all the excited singlet states are found to be optically dark in the absorption. These dark excitons are shown to originate mainly from the geometric symmetry of the system and would remain inactive even when the electron-hole or sublattice symmetry is broken...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28819644/hfse2-and-zrse2-two-dimensional-semiconductors-with-native-high-%C3%AE%C2%BA-oxides
#10
Michal J Mleczko, Chaofan Zhang, Hye Ryoung Lee, Hsueh-Hui Kuo, Blanka Magyari-Köpe, Robert G Moore, Zhi-Xun Shen, Ian R Fisher, Yoshio Nishi, Eric Pop
The success of silicon as a dominant semiconductor technology has been enabled by its moderate band gap (1.1 eV), permitting low-voltage operation at reduced leakage current, and the existence of SiO2 as a high-quality "native" insulator. In contrast, other mainstream semiconductors lack stable oxides and must rely on deposited insulators, presenting numerous compatibility challenges. We demonstrate that layered two-dimensional (2D) semiconductors HfSe2 and ZrSe2 have band gaps of 0.9 to 1.2 eV (bulk to monolayer) and technologically desirable "high-κ" native dielectrics HfO2 and ZrO2, respectively...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28819192/scalable-fabrication-of-the-graphitic-substrates-for-graphene-enhanced-raman-spectroscopy
#11
Tommi Kaplas, Antti Matikainen, Tarmo Nuutinen, Sari Suvanto, Pasi Vahimaa, Yuri Svirko
We propose direct synthesis of ultra-thin graphitic films on a dielectric substrate using sacrificial Ni catalyst layer, which significantly increases the crystallinity of the photoresist pyrolyzed at the temperature of 800 °C and above. A considerable amount of multilayer graphene in the photoresist film pyrolyzed in the presence of the Ni catalyst gives rise to an enhancement of the Raman signal of dye Sudan III molecules deposited on the substrate. We demonstrate comparable enhancement of the Raman signal from Sudan III molecules deposited on the fabricated graphitic substrate and those deposited on graphene, which was conventionally transferred to the silica substrate...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819129/dielectric-properties-of-y-and-nb-co-doped-tio2-ceramics
#12
Xianwei Wang, Bihui Zhang, Linhai Xu, Xiaoer Wang, Yanchun Hu, Gaohang Shen, Lingyun Sun
In this work, the (Y0.5Nb0.5)xTi1-xO2 (x = 0.001, 0.01, 0.02, 0.04, 0.06 and 0.1) ceramics (as called YNTO) were fabricated by synthesized through a standard solid-state reaction. As revealed by the X-ray diffraction (XRD) spectra, the YNTOs exhibit tetragonal rutile structure. Meanwhile, the grain size of YNTO ceramics increased and then decreased with the increase of x value, and the largest value reached when x = 0.02. All the YNTO samples display colossal permittivity (~10(2)-10(5)) over a wide temperature and frequency range...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819119/the-synergistic-effects-of-the-micro-and-nano-particles-in-micro-nano-composites-on-enhancing-the-resistance-to-electrical-tree-degradation
#13
Wenxuan Wang, Ying Yang
A new method of increasing the durability and reliability of polymer dielectrics has been proposed by designing a composite structure of the micro and nano particles. The synergistic effects of the micro particles and nano particles are found to enhance the resistance to electrical tree and extend the lifetime of polymer dielectrics for insulations. Epoxy loaded with the micro and nano SiO2 particles at different concentrations are prepared as micro-nano composites. The micro particles show the blocking effects on the electrical tree channel and the interfaces of the nano particles lead to the inhibiting effects on the tree inception and propagation...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819103/mass-production-of-polymer-nano-wires-filled-with-metal-nano-particles
#14
Nino Lomadze, Alexey Kopyshev, Matias Bargheer, Markus Wollgarten, Svetlana Santer
Despite the ongoing progress in nanotechnology and its applications, the development of strategies for connecting nano-scale systems to micro- or macroscale elements is hampered by the lack of structural components that have both, nano- and macroscale dimensions. The production of nano-scale wires with macroscale length is one of the most interesting challenges here. There are a lot of strategies to fabricate long nanoscopic stripes made of metals, polymers or ceramics but none is suitable for mass production of ordered and dense arrangements of wires at large numbers...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28817289/how-to-drive-a-flashing-electron-ratchet-to-maximize-current
#15
Ofer Kedem, Bryan Lau, Emily A Weiss
Biological systems utilize a combination of asymmetry, noise, and chemical energy to produce motion in the highly damped environment of the cell with molecular motors, many of which are "ratchets", non-equilibrium devices for producing directed transport using non-directional perturbations, without a net bias. The underlying ratchet principle has been implemented in man-made micro- and nano-devices, to transport charged particles by oscillating an electric potential with repeating asymmetric features. In this experimental study, the ratcheting of electrons in an organic semiconductor is optimized by tuning the temporal modulation of the oscillating potential, applied using nanostructured electrodes...
August 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28817144/resonant-silicon-nanoparticles-for-enhancement-of-light-absorption-and-photoluminescence-from-hybrid-perovskite-films-and-metasurfaces
#16
E Tiguntseva, A Chebykin, A Ishteev, R Haroldson, B Balachandran, E Ushakova, F Komissarenko, H Wang, V Milichko, A Tsypkin, D Zuev, W Hu, S Makarov, A Zakhidov
Recently, hybrid halide perovskites have emerged as one of the most promising types of materials for thin-film photovoltaic and light-emitting devices because of their low-cost and potential for high efficiency. Further boosting their performance without detrimentally increasing the complexity of the architecture is critically important for commercialization. Despite a number of plasmonic nanoparticle based designs having been proposed for solar cell improvement, inherent optical losses of the nanoparticles reduce photoluminescence from perovskites...
August 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28816178/plasmon-modes-of-bilayer-molybdenum-disulfide-a-density-functional-study
#17
Zahra Torbatian, Reza Asgari
We explore the collective electronic excitations of bilayer molybdenum disulfide (MoS2 ) using the density functional theory together with the random phase approximation. The many-body dielectric function and electron energy-loss spectra are calculated using an ab initio based model involving material-realistic physical properties. The electron energy-loss function of bilayer MoS2 system is found to be sensitive to either electron or hole doping and it is owing to the fact that the Kohn-Sham band dispersions are not symmetric for energies above and below the zero Fermi level...
August 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28816043/electronic-muscles-and-skins-a-review-of-soft-sensors-and-actuators
#18
Dustin Chen, Qibing Pei
This article reviews several classes of compliant materials that can be utilized to fabricate electronic muscles and skins. Different classes of materials range from compliant conductors, semiconductors, to dielectrics, all of which play a vital and cohesive role in the development of next generation electronics. This paper covers recent advances in the development of new materials, as well as the engineering of well-characterized materials for the repurposing in applications of flexible and stretchable electronics...
August 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28815232/blue-shifting-tuning-of-the-selective-reflection-of-polymer-stabilized-cholesteric-liquid-crystals
#19
Kyung Min Lee, Vincent P Tondiglia, Nicholas P Godman, Claire M Middleton, Timothy J White
We report on electrically-induced, large magnitude (>300 nm), and reversible tuning of the selective reflection in polymer stabilized cholesteric liquid crystals (PSCLCs) prepared from negative dielectric anisotropy nematic liquid crystal hosts. The electrically-induced blue shift in the selective reflection of the PSCLCs is distinguished from our prior reports of bandwidth broadening and red-shifting tuning of the selective reflection in PSCLCs. The dominant factor in delineating the electro-optic response of the PSCLCs detailed here are the preparation conditions...
August 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28814735/self-assembly-of-ternary-hollow-microspheres-with-strong-wideband-microwave-absorption-and-controllable-microwave-absorption-properties
#20
Qiang Zeng, Ping Chen, Qi Yu, Hai-Rong Chu, Xu-Hai Xiong, Dong-Wei Xu, Qi Wang
In this study, we report a simple and efficient two-step method consisting of water-in-oil (W/O) emulsion technique and subsequent annealing process for synthesizing the hollow reduced graphene oxide microspheres embedded with Co nanoparticles (Air@rGO€Co). The microspheres showed good electromagnetic properties because of the coexistence of magnetic loss and dielectric loss to microwaves. The minimum reflection loss (RLmin) value of S1.5 reaches -68.1 dB at 13.8 GHz with a thickness of 2.2 mm, and the absorption bandwidth (lower than -10 dB) is 7...
August 16, 2017: Scientific Reports
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