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Takafumi Nakagaki, Miyuki Tamura, Kenta Kobashi, Ryota Koyama, Hisayo Fukushima, Tomoko Ohashi, Masashi Idogawa, Kazuhiro Ogi, Hiroyoshi Hiratsuka, Takashi Tokino, Yasushi Sasaki
Somatic mutation analysis is a standard practice in the study of human cancers to identify mutations that cause therapeutic sensitization and resistance. We performed comprehensive genomic analyses that used PCR target enrichment and next-generation sequencing on Ion Proton semiconductor sequencers. Forty-seven oral squamous cell carcinoma (OSCC) samples and their corresponding noncancerous tissues were used for multiplex PCR amplification to obtain targeted coverage of the entire coding regions of 409 cancer-related genes (covered regions: 95...
July 15, 2017: Oncotarget
Dominik Irber, Jakob Seidl, Damon James Carrad, Jonathan Becker, Nari Jeon, Bernhard Loitsch, Julia Winnerl, Sonja Matich, Markus Döblinger, Yang Tang, Stefanie Morkötter, Gerhard Abstreiter, Jonathan J Finley, M Grayson, Lincoln Lauhon, Gregor Koblmueller
Modulation-doped III-V semiconductor nanowire (NW) heterostructures have recently emerged as promising candidates to host high-mobility electron channels for future high-frequency, low-energy transistor technologies. The one-dimensional geometry of NWs also makes them attractive for studying quantum confinement effects. Here, we report correlated investigations into the discrete electronic sub-band structure of confined electrons in the channel of Si delta-doped GaAs/AlAs core-superlattice NW heterostructures and the associated signatures in low-temperature transport...
July 21, 2017: Nano Letters
Jens Kügel, Markus Leisegang, Markus Böhme, Andreas Krönlein, Aimee Sixta, Matthias Bode
Molecular electronics where single molecules perform basic functionalities of digital circuits is a fascinating concept that one day may augment or even replace nowadays semiconductor technologies. The tautomerization of molecules, i.e., the bistable functional position of hydrogen protons within an organic frame, has recently been intensively discussed as a potential avenue towards nano-scale switches. It has been shown that tautomerization can be triggered locally or non-locally, i.e. by a scanning tunneling microscope (STM) tip positioned directly above or in close vicinity to the molecule...
July 21, 2017: Nano Letters
Yalong Jiao, Fengxian Ma, Chunmei Zhang, John Bell, Stefano Sanvito, Aijun Du
Spin-polarized materials with Dirac features have sparked great scientific interest due to their potential applications in spintronics. But such a type of structure is very rare and none has been fabricated. Here, we investigate the already experimentally synthesized manganese fluoride (MnF_{3}) as a novel spin-polarized Dirac material by using first-principles calculations. MnF_{3} exhibits multiple Dirac cones in one spin orientation, while it behaves like a large gap semiconductor in the other spin channel...
July 7, 2017: Physical Review Letters
R Stockill, M J Stanley, L Huthmacher, E Clarke, M Hugues, A J Miller, C Matthiesen, C Le Gall, M Atatüre
Quantum entanglement between distant qubits is an important feature of quantum networks. Distribution of entanglement over long distances can be enabled through coherently interfacing qubit pairs via photonic channels. Here, we report the realization of optically generated quantum entanglement between electron spin qubits confined in two distant semiconductor quantum dots. The protocol relies on spin-photon entanglement in the trionic Λ system and quantum erasure of the Raman-photon path information. The measurement of a single Raman photon is used to project the spin qubits into a joint quantum state with an interferometrically stabilized and tunable relative phase...
July 7, 2017: Physical Review Letters
Naihua Miao, Bin Xu, Nicholas C Bristowe, Jian Zhou, Zhimei Sun
Atomically thin two-dimensional (2D) materials have received considerable research interest due to their extraordinary properties and promising applications. Here we predict the mono-layered indium triphosphide (InP3) as a new semiconducting 2D material with a range of favourable functional properties by means of ab initio calculations. The 2D InP3 crystal shows high stability and promise of experimental synthesis. It possesses an indirect band-gap of 1.14 eV and a high electron mobility of 1919 cm(2)V(-1)s(-1), which can be strongly manipulated with applied strain...
July 21, 2017: Journal of the American Chemical Society
Hongwei Huang, Shuchen Tu, Chao Zeng, Tierui Zhang, A H Reshak, Yihe Zhang
We report that both efficient photo- and piezoelectric- induced molecular oxygen activation are achieved via macroscopic polarization enhancement on a noncentrosymmetric piezoelectric semiconductor BiOIO3. The replacement of V5+ ions for I5+ in IO3 polyhedra gives rise to strengthened macroscopic polarization of BiOIO3, which facilitates the charge separation in the photocatalytic and piezoelectric-catalytic process, and renders largely promoted photo- and piezoelectric induced reactive oxygen species (ROS) evolution, such as superoxide radicals (*O2-) and hydroxyl radicals (*OH)...
July 21, 2017: Angewandte Chemie
Yuqiao Fu, Siu-Pang Ng, Guangyu Qiu, Tak-Fu Hung, Chi-Man Lawrence Wu, Chun-Sing Lee
Plasmonic enhanced dye-sensitized solar cells (DSSCs) with metallic nanostructures suffer from corrosion problems, especially with the presence of the iodine/triiodide redox couple in the electrolyte. Herein, we introduce an alternative approach by compensating the corrosion with a modified liquid electrolyte. In contrast to the existing method of surface preservation for plasmonic nanostructures, the redox-controlled electrolyte (RCE) contains iodoaurate intermediates, i.e. gold(i) diiodide (AuI2(-)) and gold(iii) tetraiodide (AuI4(-)) with optimal concentrations, such that these intermediates are readily reduced to gold nanoparticles during the operation of DSSCs...
July 21, 2017: Nanoscale
Shunfeng Wang, Junyong Wang, Weijie Zhao, Francesco Giustiniano, Leiqiang Chu, Ivan Verzhbitskiy, Justin Zhou Yong, Goki Eda
We report on efficient carrier-to-exciton conversion and planer electroluminescence from tunnel diodes based on a metal-insulator-semiconductor van der Waals heterostack consisting of few-layer graphene (FLG), hexagonal boron nitride (hBN), and monolayer tungsten disulfide (WS2). These devices exhibit excitonic electroluminescence with extremely low threshold current density of a few pA∙μm-2, which is several orders of magnitude lower compared to the previously reported values for the best planar EL devices...
July 21, 2017: Nano Letters
Giuseppe Calogero, Ilaria Citro, Gaetano Di Marco, Stefano Caramori, Laura Casarin, Carlo Alberto Bignozzi, João Avó, A Jorge Parola, Fernando Pina
We present here a complete study on four synthetic environmentally friendly flavylium salts employed as sensitizers for dye-sensitized solar cells (DSSCs). The effect of several donor groups on the molecular structure of flavylium ions was investigated by combining electrochemical, spectroscopic and computational means. The computational investigation indicated that these molecules can interact strongly with the TiO2 surface by a single OH group of the dihydroxybenzene moiety, and can efficiently inject electrons into the TiO2 following the excitation of their lowest singlet states exhibiting charge transfer (CT) character...
July 21, 2017: Photochemical & Photobiological Sciences
Kyriaki Manoli, Preethi Seshadri, Mandeep Singh, Cinzia Di Franco, Angelo Nacci, Gerardo Palazzo, Luisa Torsi
Electrical double layer (EDL) thin film transistors (TFTs) are an interesting class of transistors that use an electrolyte as the gating medium. Recently it has been demonstrated that pure organic solvents can also be used as gating media for TFTs without the addition of exogenous electrolytes. Here we present a systematic study of the performances of TFTs based on two different semiconductors (P3HT and ZnO) gated through nine different solvents either pure or loaded with NaCl. The nature of the solvent impacts the transfer characteristics of the TFT through a change in the gating capacitance while the threshold voltage remains unaffected...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
Murat Sivis, Marco Taucer, Giulio Vampa, Kyle Johnston, André Staudte, Andrei Yu Naumov, D M Villeneuve, Claus Ropers, P B Corkum
The advent of high-harmonic generation in gases 30 years ago set the foundation for attosecond science and facilitated ultrafast spectroscopy in atoms, molecules, and solids. We explore high-harmonic generation in the solid state by means of nanostructured and ion-implanted semiconductors. We use wavelength-selective microscopic imaging to map enhanced harmonic emission and show that the generation medium and the driving field can be locally tailored in solids by modifying the chemical composition and morphology...
July 21, 2017: Science
S Obregón, M A Ruíz-Gómez, D B Hernández-Uresti
In the present work, the Bi2W2O9 photocatalyst has been prepared by an easy and prompt co-precipitation route. From the structural characterization, we have stated that the formation of the Bi2W2O9 is accompanied by a small amount of the Bi2WO6 oxide, which gradually decreases by increasing the calcination temperature. The conduction and valence band edges of the Bi2W2O9 semiconductor were experimentally estimated for the first time using the X-ray photoelectron (XPS) and diffuse reflectance (DRS) spectroscopies...
July 8, 2017: Journal of Colloid and Interface Science
Zhicong Luo, Ming-Dou Ker, Tzu-Yi Yang, Wan-Hsueh Cheng
A new digitally dynamic power supply technique for 16-channel 12-V-tolerant stimulator is proposed and realized in a 0.18-μm 1.8-V/3.3-V CMOS process. The proposed stimulator uses four stacked transistors as the pull-down switch and pull-up switch to withstand 4 times the nominal supply voltage (4 × V DD). With the dc input voltage of 3.3 V, the regulated three-stage charge pump, which is capable of providing 11.3-V voltage at 3-mA loading current, achieves dc conversion efficiency of up to 69% with 400-pF integrated capacitance...
July 18, 2017: IEEE Transactions on Biomedical Circuits and Systems
Henry Auer, Holger Kohlmann
The hydrogenation of Zintl phases enables the formation of new structural entities with main group element-hydrogen bonds in the solid state. The hydrogenation of SrSi, BaSi and BaGe yields the hydrides SrSiH5/3-x, BaSiH5/3-x and BaGeH5/3-x, whose crystal structures were solved by a combination of X-ray, neutron and electron diffraction. Layers of connected HSr4 (HBa4) tetrahedra containing hydride ions alternate with layers of infinite single- and double-chain polyanions, where hydrogen atoms are covalently bound to silicon and germanium...
July 20, 2017: Angewandte Chemie
Puqing Jiang, Xin Qian, Xiaokun Gu, Ronggui Yang
Transition metal dichalcogenides (TMDs) are a group of layered 2D semiconductors that have shown many intriguing electrical and optical properties. However, the thermal transport properties in TMDs are not well understood due to the challenges in characterizing anisotropic thermal conductivity. Here, a variable-spot-size time-domain thermoreflectance approach is developed to simultaneously measure both the in-plane and the through-plane thermal conductivity of four kinds of layered TMDs (MoS2 , WS2 , MoSe2 , and WSe2 ) over a wide temperature range, 80-300 K...
July 20, 2017: Advanced Materials
Ashley Weiland, Jian-Han Zhang, Daniel J Clark, Jacilynn A Brant, Charles W Sinagra, Yong Soo Kim, Joon I Jang, Jennifer A Aitken
Correction for 'Infrared nonlinear optical properties of lithium-containing diamond-like semiconductors Li2ZnGeSe4 and Li2ZnSnSe4' by Jian-Han Zhang et al., Dalton Trans., 2015, 44, 11212-11222.
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
R Hu, Z H Zhang, Z Q Fan
New one-dimensional (1D) crystals, 1D quantum-dot arrays(1D QDAs), are proposed and constructed by an ordered arrangement of zigzag-edged triangular h-BN nanoflakes. Their geometrical stability is confirmed by the calculated binding energy, phonon dispersion and molecular dynamics simulation. These 1D QDAs demonstrate different quantum confinement effects on electronic and half-metallic properties due to different linking modes. For example, in the nonmagnetic state, different 1D QDAs are predicted to be semiconductors or metals remarkably depending on their linking manner, whereas in the ferromagnetic state, they are found to be all prominent half-metals but with greatly different gaps from ∼0...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
Pisek Kultavewuti, Eric Y Zhu, Xingxing Xing, Li Qian, Vincenzo Pusino, Marc Sorel, J Stewart Aitchison
Photonic-based qubits and integrated photonic circuits have enabled demonstrations of quantum information processing (QIP) that promises to transform the way in which we compute and communicate. To that end, sources of polarization-entangled photon pair states are an important enabling technology. However, such states are difficult to prepare in an integrated photonic circuit. Scalable semiconductor sources typically rely on nonlinear optical effects where polarization mode dispersion (PMD) degrades entanglement...
July 19, 2017: Scientific Reports
Tiening Jin, Leigang Li, Bruce Zhang, Hao-Yu Greg Lin, Haiyan Wang, Pao Tai Lin
Chip-scale chemical detection is demonstrated by using mid-Infrared (mid-IR) photonic circuits consisting of amorphous silicon (a-Si) waveguides on an epitaxial barium titanate (BaTiO3, BTO) thin film. The highly c-axis oriented BTO film was grown by the pulsed laser deposition (PLD) method and it exhibits a broad transparent window from λ = 2.5 μm up to 7 μm. The waveguide structure was fabricated by the complementary metal-oxide-semiconductor (CMOS) process and a sharp fundamental waveguide mode has been observed...
July 19, 2017: Scientific Reports
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