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Semiconductors

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https://www.readbyqxmd.com/read/27925730/intrinsic-ferromagnetism-in-the-diluted-magnetic-semiconductor-co-tio_-2
#1
H Saadaoui, X Luo, Z Salman, X Y Cui, N N Bao, P Bao, R K Zheng, L T Tseng, Y H Du, T Prokscha, A Suter, T Liu, Y R Wang, S Li, J Ding, S P Ringer, E Morenzoni, J B Yi
Here we present a study of magnetism in Co_{0.05}Ti_{0.95}O_{2-δ} anatase films grown by pulsed laser deposition under a variety of oxygen partial pressures and deposition rates. Energy-dispersive spectrometry and transmission electron microscopy analyses indicate that a high deposition rate leads to a homogeneous microstructure, while a very low rate or postannealing results in cobalt clustering. Depth resolved low-energy muon spin rotation experiments show that films grown at a low oxygen partial pressure (≈10^{-6}  torr) with a uniform structure are fully magnetic, indicating intrinsic ferromagnetism...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925365/regenerative-electroless-etching-of-silicon
#2
Kurt W Kolasinski, Nathan J Gimbar, Haibo Yu, Mark Aindow, Ermei Mäkilä, Jarno Salonen
Regenerative electroless etching (ReEtching), described herein for the first time, is a method of producing nanostructured semiconductors in which an oxidant (Ox1 ) is used as a catalytic agent to facilitate the reaction between a semiconductor and a second oxidant (Ox2 ) that would be unreactive in the primary reaction. Ox2 is used to regenerate Ox1 , which is capable of initiating etching by injecting holes into the semiconductor valence band. Therefore, the extent of reaction is controlled by the amount of Ox2 added, and the rate of reaction is controlled by the injection rate of Ox2 ...
December 7, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27924939/subwavelength-insb-based-slot-wavguides-for-thz-transport-concept-and-practical-implementations
#3
Youqiao Ma, Jun Zhou, Jaromír Pištora, Mohamed Eldlio, Nghia Nguyen-Huu, Hiroshi Maeda, Qiang Wu, Michael Cada
Seeking better surface plasmon polariton (SPP) waveguides is of critical importance to construct the frequency-agile terahertz (THz) front-end circuits. We propose and investigate here a new class of semiconductor-based slot plasmonic waveguides for subwavelength THz transport. Optimizations of the key geometrical parameters demonstrate its better guiding properties for simultaneous realization of long propagation lengths (up to several millimeters) and ultra-tight mode confinement (~λ(2)/530) in the THz spectral range...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924708/has-dry-cold-weather-an-impact-on-the-skin-condition-of-cleanroom-workers
#4
Wobbeke Weistenhöfer, Wolfgang Uter, Hans Drexler
In previous epidemiological studies irritant skin changes were reported significantly more frequently under dry/cold ambient air conditions. The aim of this study was to assess whether a similar effect might be observed in cleanroom workers, occupationally exposed to strictly controlled ambient conditions. This investigation examined 690 employees of a semiconductor production company in Germany, one half in winter (n = 358) and the other half in spring (n = 332). In both waves, both cleanroom workers, who used occlusive gloves predominantly during the entire shift, and employees in the administration, serving as the control group, were included...
2016: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/27924315/control-of-selective-ion-transfer-across-liquid-liquid-interfaces-a-rectifying-heterojunction-based-on-immiscible-electrolytes
#5
Guillermo Iván Guerrero-García, Francisco J Solis, Kalyan Raidongia, Andrew Robert Koltonow, Jiaxing Huang, Mónica Olvera de la Cruz
The current rectification displayed by solid-state p-n semiconductor diodes relies on the abundance of electrons and holes near the interface between the p-n junction. In analogy to this electronic device, we propose here the construction of a purely ionic liquid-state electric rectifying heterojunction displaying an excess of monovalent cations and anions near the interface between two immiscible solvents with different dielectric properties. This system does not need any physical membrane or material barrier to show preferential ion transfer but relies on the ionic solvation energy between the two immiscible solvents...
November 23, 2016: ACS Central Science
https://www.readbyqxmd.com/read/27920898/quantum-dots-dna-bioconjugates-synthesis-to-applications
#6
REVIEW
Anusuya Banerjee, Thomas Pons, Nicolas Lequeux, Benoit Dubertret
Semiconductor nanoparticles particularly quantum dots (QDs) are interesting alternatives to organic fluorophores for a range of applications such as biosensing, imaging and therapeutics. Addition of a programmable scaffold such as DNA to QDs further expands the scope and applicability of these hybrid nanomaterials in biology. In this review, the most important stages of preparation of QD-DNA conjugates for specific applications in biology are discussed. Special emphasis is laid on (i) the most successful strategies to disperse QDs in aqueous media, (ii) the range of different conjugation with detailed discussion about specific merits and demerits in each case, and (iii) typical applications of these conjugates in the context of biology...
December 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27919517/centrifugal-partition-chromatography-a-preparative-tool-for-isolation-and-purification-of-xylindein-from-chlorociboria-aeruginosa
#7
Anukul Boonloed, Genevieve L Weber, Kelly M Ramzy, Veronica R Dias, Vincent T Remcho
A centrifugal partition chromatography (CPC) method was developed for the preparative-scale isolation and purification of xylindein from the wood-staining fungi, Chlorociboria aeruginosa. Xylindein, a blue-green pigment naturally secreted from the hyphae and fruiting bodies of the fungus, has great value in the decorative wood industry and textile coloration. Xylindein has great potential for use as a fluorescent labeling agent as well as in organic semiconductor applications. However, a primary limitation of xylindein is its poor solubility in most common HPLC solvents...
November 18, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27918651/rational-design-of-high-performance-wide-bandgap-%C3%A2-2-ev-polymer-semiconductors-as-electron-donors-in-organic-photovoltaics-exhibiting-high-open-circuit-voltages-%C3%A2-1-v
#8
Christos L Chochos, Athanasios Katsouras, Nicola Gasparini, Chrysanthos Koulogiannis, Tayebeh Ameri, Christoph J Brabec, Apostolos Avgeropoulos
Systematic optimization of the chemical structure of wide-bandgap (≈2.0 eV) "donor-acceptor" copolymers consisting of indacenodithiophene or indacenodithieno[3,2-b]thiophene as the electron-rich unit and thieno[3,4-c]pyrrole-4,6-dione as the electron-deficient moiety in terms of alkyl side chain engineering and distance of the electron-rich and electron-deficient monomers within the repeat unit of the polymer chain results in high-performance electron donor materials for organic photovoltaics. Specifically, preliminary results demonstrate extremely high open circuit voltages (V oc s) of ≈1...
December 5, 2016: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/27918568/solution-based-electrical-doping-of-semiconducting-polymer-films-over-a-limited-depth
#9
Vladimir A Kolesov, Canek Fuentes-Hernandez, Wen-Fang Chou, Naoya Aizawa, Felipe A Larrain, Ming Wang, Alberto Perrotta, Sangmoo Choi, Samuel Graham, Guillermo C Bazan, Thuc-Quyen Nguyen, Seth R Marder, Bernard Kippelen
Solution-based electrical doping protocols may allow more versatility in the design of organic electronic devices; yet, controlling the diffusion of dopants in organic semiconductors and their stability has proven challenging. Here we present a solution-based approach for electrical p-doping of films of donor conjugated organic semiconductors and their blends with acceptors over a limited depth with a decay constant of 10-20 nm by post-process immersion into a polyoxometalate solution (phosphomolybdic acid, PMA) in nitromethane...
December 5, 2016: Nature Materials
https://www.readbyqxmd.com/read/27918294/synthesis-and-characterization-of-a-cadmium-ii-organic-supramolecular-coordination-compound-based-on-the-multifunctional-2-amino-5-sulfobenzoic-acid-ligand
#10
Gan Yin Yuan, Lei Zhang, Meng Jie Wang, Kou Lin Zhang
Much attention has been paid by chemists to the construction of supramolecular coordination compounds based on the multifunctional ligand 5-sulfosalicylic acid (H3SSA) due to the structural and biological interest of these compounds. However, no coordination compounds have been reported for the multifunctional amino-substituted sulfobenzoate ligand 2-amino-5-sulfobenzoic acid (H2asba). We expected that H2asba could be a suitable building block for the assembly of supramolecular networks due to its interesting structural characteristics...
December 1, 2016: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/27918125/conductance-switch-of-a-bromoplumbate-bistable-semiconductor-by-electron-transfer-thermochromism
#11
Cai Sun, Ming-Sheng Wang, Pei-Xin Li, Guo-Cong Guo
Electron-transfer (redox) thermochromism was successfully used for switching the conductance of semiconductors, by introducing a thermally active organic component into an inorganic semiconducting framework. A moisture-resistant semiconductor {(MV)2 [Pb7 Br18 ]}n (MV(2+) =methyl viologen cation) has been prepared through an in situ synthetic method for MV(2+) . It features a rare 3D haloplumbate open framework and unprecedented electron-transfer thermochromic behavior in haloplumbates. The electrical conductivity of this compound dropped significantly after coloration and restored after decoloration, which was satisfactorily explained by valence band XPS and theoretical data...
December 5, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27918021/photo-catalyzed-surface-hydrolysis-of-iridium-iii-ions-on-semiconductors-a-facile-method-for-the-preparation-of-semiconductor-irox-composite-photoanodes-toward-oxygen-evolution-reaction
#12
Qingyong Wu, Di Xu, Ning Xue, Tengyi Liu, Min Xiang, Peng Diao
We previously reported that the hydrolysis of Ir(3+) in homogeneous solution could be triggered by irradiation with light whose energy was larger than a threshold value. In this work, we demonstrated that, by introducing Fe2O3 particles into solution, the incident light energy-restriction for the photo-catalyzed hydrolysis could be broken and the hydrolysis occurred at the Fe2O3/solution interface. The photo-generated holes on the Fe2O3 surface played a key role in oxidizing Ir(iii) to Ir(iv) species and triggered the deposition of IrOx...
December 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27917885/vortex-laser-based-on-iii-v-semiconductor-metasurface-direct-generation-of-coherent-laguerre-gauss-modes-carrying-controlled-orbital-angular-momentum
#13
Mohamed S Seghilani, Mikhael Myara, Mohamed Sellahi, Luc Legratiet, Isabelle Sagnes, Grégoire Beaudoin, Philippe Lalanne, Arnaud Garnache
The generation of a coherent state, supporting a large photon number, with controlled orbital-angular-momentum L = ħl (of charge l per photon) presents both fundamental and technological challenges: we demonstrate a surface-emitting laser, based on III-V semiconductor technology with an integrated metasurface, generating vortex-like coherent state in the Laguerre-Gauss basis. We use a first order phase perturbation to lift orbital degeneracy of wavefunctions, by introducing a weak anisotropy called here "orbital birefringence", based on a dielectric metasurface...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27916911/a-multipurpose-cmos-platform-for-nanosensing
#14
Alberto Bonanno, Alessandro Sanginario, Simone L Marasso, Beatrice Miccoli, Katarzyna Bejtka, Simone Benetto, Danilo Demarchi
This paper presents a customizable sensing system based on functionalized nanowires (NWs) assembled onto complementary metal oxide semiconductor (CMOS) technology. The Micro-for-Nano (M4N) chip integrates on top of the electronics an array of aluminum microelectrodes covered with gold by means of a customized electroless plating process. The NW assembly process is driven by an array of on-chip dielectrophoresis (DEP) generators, enabling a custom layout of different nanosensors on the same microelectrode array...
November 30, 2016: Sensors
https://www.readbyqxmd.com/read/27916848/water-will-be-the-coal-of-the-future-the-untamed-dream-of-jules-verne-for-a-solar-fuel
#15
REVIEW
Vladimir K Ryabchuk, Vyacheslav N Kuznetsov, Alexei V Emeline, Yurii M Artem'ev, Galina V Kataeva, Satoshi Horikoshi, Nick Serpone
This article evokes the futuristic visions of two giants, one a writer, Jules Verne, who foresaw water as the coal of the future, and the other a scientist, Giacomo Ciamician, who foresaw the utilization of solar energy as an energy source with which to drive photochemical and photocatalytic reactions for the betterment of mankind. Specifically, we examine briefly the early work of the 1960s and 1970s on the photosplitting of free water and water adsorbed on solid supports, based mostly on metal oxides, from which both hydrogen and oxygen evolve in the expected stoichiometric ratio of 2 to 1...
November 29, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27915977/a-review-on-recent-patents-and-applications-of-inorganic-material-binding-peptides
#16
Veeranjaneyulu Thota, Carole C Perry
Over the past decade, significant progress has been made in the identification of novel material binding peptides having affinity to a wide range of target materials and their use in nanobiotechnological innovations. These material binding peptides (MBPs), also known as solid/ substance binding peptides (SBPs) can be isolated using combinatorial display technologies such as phage display (PD), surface display (cell, bacterial, yeast, mRNA) exhibit material specific selectivity and affinity towards a range of inorganic and organic nanomaterial surfaces including metals, metal oxides, minerals, semiconductors and biomolecules...
December 1, 2016: Recent Patents on Nanotechnology
https://www.readbyqxmd.com/read/27915209/development-of-neural-population-activity-towards-self-organized-criticality
#17
Yuichiro Yada, Takeshi Mita, Akihiro Sanada, Ryuichi Yano, Ryohei Kanzaki, Douglas J Bakkum, Andreas Hierlemann, Hirokazu Takahashi
Self-organized criticality (SoC), a spontaneous dynamic state established and maintained in networks of moderate complexity, is a universal characteristic of neural systems. Such systems produce cascades of spontaneous activity that are typically characterized by power-law distributions and rich, stable spatiotemporal patterns (i.e., neuronal avalanches). Since the dynamics of the critical state confer advantages in information processing within neuronal networks, it is of great interest to determine how criticality emerges during development...
November 30, 2016: Neuroscience
https://www.readbyqxmd.com/read/27914582/photochemistry-of-nanoporous-carbons-perspectives-in-energy-conversion-and-environmental-remediation
#18
REVIEW
Alicia Gomis-Berenguer, Leticia F Velasco, Inmaculada Velo-Gala, Conchi O Ania
The interest in the use of nanoporous carbon materials in applications related to energy conversion and storage, either as catalysts or additives, has grown over recent decades in various disciplines. Since the early studies reporting the benefits of the use of nanoporous carbons as inert supports of semiconductors and as electron acceptors that enhance the splitting of the photogenerated excitons, many researchers have investigated the key role of carbon matrices coupled to all types of photoactive materials...
November 16, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27914369/dna-tetrahedral-scaffolds-based-platform-for-the-construction-of-electrochemiluminescence-biosensor
#19
Qiu-Mei Feng, Zhen Zhou, Mei-Xing Li, Wei Zhao, Jing-Juan Xu, Hong-Yuan Chen
Proximal metallic nanoparticles (NPs) could quench the electrochemiluminescence (ECL) emission of semiconductor quantum dots (QDs) due to Förster energy transfer (FRET), but at a certain distance, the coupling of light-emission with surface plasmon resonance (SPR) result in enhanced ECL. Thus, the modification strategies and distances control between QDs and metallic NPs are critical for the ECL intensity of QDs. In this strategy, a SPR enhanced ECL sensor based on DNA tetrahedral scaffolds modified platform was reported for the detection of telomerase activity...
November 27, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27914341/single-crystalline-titanium-dioxide-hollow-tetragonal-nanocones-with-large-exposed-101-facets-for-excellent-photocatalysis
#20
Zhengcui Wu, Yejing Xue, Zexian Zou, Xia Wang, Feng Gao
Crystal facet engineering and surface modification of semiconductor have become important strategies to improve photocatalytic activity by optimizing surface charge carrier separation/transfer and extending solar spectrum utilization. In this work, we report anatase single-crystalline TiO2 hollow tetragonal nanocones with large exposed (101) facets by a facile liquid-phase interfacial synthetic strategy, using the hydrolysis of tetrabutyltitanate with adscititious water in the organic solvent of cyclohexane and a capping agent of 1, 6-hexanediamine...
November 23, 2016: Journal of Colloid and Interface Science
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