Read by QxMD icon Read


Binh Tinh Tran, Hideki Hirayama
Growing III-V semiconductor materials on Si substrates for opto-electronic applications is challenging because their high lattice mismatch and different thermal expansion coefficients cause the epitaxial layers to have low quality. Here we report the growth of a high-quality AlN template on a micro-circle-patterned Si substrate by using NH3 pulsed-flow multilayer AlN growth and epitaxial lateral overgrowth techniques. Then, we fabricated and characterized a deep-ultraviolet light-emitting diode (UV-LED) device using this AlN/patterned Si...
September 22, 2017: Scientific Reports
Shoujun Zheng, Jinkyu So, Fucai Liu, Zheng Liu, Nikolay I Zheludev, Hong Jin Fan
Monolayer two-dimensional transitional metal dichalcogenides, such as MoS2, WS2 and WSe2, are direct band gap semiconductors with large exciton binding energy. They attract growing attentions for opto-electronic applications including solar cells, photo-detectors, light-emitting diodes and photo-transistors, capacitive energy storage, photodynamic cancer therapy and sensing on flexible platforms. While light-induced luminescence has been widely studied, luminescence induced by injection of free electrons could promise another important applications of these new materials...
September 21, 2017: Nano Letters
Kang Wang, Chaitra Jayadev, Muneeswar G Nittala, Swetha B Velaga, Chaithanya A Ramachandra, Malavika Bhaskaranand, Sandeep Bhat, Kaushal Solanki, SriniVas R Sadda
PURPOSE: We examined the sensitivity and specificity of an automated algorithm for detecting referral-warranted diabetic retinopathy (DR) on Optos ultrawidefield (UWF) pseudocolour images. METHODS: Patients with diabetes were recruited for UWF imaging. A total of 383 subjects (754 eyes) were enrolled. Nonproliferative DR graded to be moderate or higher on the 5-level International Clinical Diabetic Retinopathy (ICDR) severity scale was considered as grounds for referral...
September 19, 2017: Acta Ophthalmologica
Nicola B Quinn, Augusto Azuara-Blanco, Katie Graham, Ruth E Hogg, Ian S Young, Frank Kee
PURPOSE: Ultra-wide field (UWF) retinal imaging (Optomap, Optos plc, Dunfermline, UK) is a novel technique to image the peripheral fundus. The goal of this study was to explore the potential use of UWF imaging to detect glaucoma, and specifically to evaluate the reproducibility of measures of vertical cup-to-disc ratio (VCDR) using ultra-wide field (UWF), and the agreement between UWF and standard colour digital stereoscopy (CDS). METHODS: An observational study...
September 18, 2017: Ophthalmic Epidemiology
Linhan Lin, Jianli Zhang, Xiaolei Peng, Zilong Wu, Anna C H Coughlan, Zhangming Mao, Michael A Bevan, Yuebing Zheng
Colloidal matter exhibits unique collective behaviors beyond what occurs at single-nanoparticle and atomic scales. Treating colloidal particles as building blocks, researchers are exploiting new strategies to rationally organize colloidal particles into complex structures for new functions and devices. Despite tremendous progress in directed assembly and self-assembly, a truly versatile assembly technique without specific functionalization of the colloidal particles remains elusive. We develop a new strategy to assemble colloidal matter under a light-controlled temperature field, which can solve challenges in the existing assembly techniques...
September 2017: Science Advances
Alessandro Aliprandi, Tiago Moreira, Cosimo Anichini, Marc-Antoine Stoeckel, Matilde Eredia, Ugo Sassi, Matteo Bruna, Carlos Pinheiro, César A T Laia, Sara Bonacchi, Paolo Samorì
This study reports a novel green chemistry approach to assemble copper-nanowires/reduced-graphene-oxide hybrid coatings onto inorganic and organic supports. Such films are robust and combine sheet resistances (<30 Ω sq(-1) ) and transparencies in the visible region (transmittance > 70%) that are rivalling those of indium-tin oxide. These electrodes are suitable for flexible electronic applications as they show a sheet resistance change of <4% after 10 000 bending cycles at a bending radius of 1.0 cm, when supported on polyethylene terephthalate foils...
September 13, 2017: Advanced Materials
Lalla Btissam Drissi, Fatima Zahra Ramadan, Samir Lounis
The optical excitation spectra and excitonic resonances are investigated in systematically functionalized SiC with Fluorine and/or Chlorine utilizing density functional theory in combination with many-body perturbation theory. The latter is required for a realistic description of the energy band-gaps as well as for the theoretical realization of excitons. Structural, electronic and optical properties are scrutinized and show the high stability of the predicted two-dimensional materials. Their realization in laboratory is thus possible...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Ganapathi Bharathi, Devaraj Nataraj, Sellan Premkumar, Murugaiyan Sowmiya, Kittusamy Senthilkumar, T Daniel Thangadurai, Oleg Yu Khyzhun, Mukul Gupta, Deodatta Phase, Nirmalendu Patra, Shambhu Nath Jha, Dibyendu Bhattacharyya
Graphene has been studied intensively in opto-electronics, and its transport properties are well established. However, efforts to induce intrinsic optical properties are still in progress. Herein, we report the production of micron-sized sheets by interconnecting graphene quantum dots (GQDs), which are termed 'GQD solid sheets', with intrinsic absorption and emission properties. Since a GQD solid sheet is an interconnected QD system, it possesses the optical properties of GQDs. Metal atoms that interconnect the GQDs in the bottom-up hydrothermal growth process, induce the semiconducting behaviour in the GQD solid sheets...
September 7, 2017: Scientific Reports
Dariusz Mroczek, Krzysztof Maćkała, Adam Kawczynski, Edward Superlak, Paweł Chmura, Tomasz Seweryniak, Jan Chmura
BACKGROUND: This study aimed to investigate the effect of a 6-week plyometric exercise training program on the development of lower limb explosive power in terms of vertical jumping ability in university level volleyball players. The study involved 9 male volleyball players from the AWF Wroclaw University Sports Club, with a minimum of 5 years of training and competition experience. The program consisted of various bounds, hops, and jumps in vertical, horizontal, and mixed directions...
September 5, 2017: Journal of Sports Medicine and Physical Fitness
Bowen Li, Shuai Zu, Jiadong Zhou, Qiao Jiang, Bowen Du, Hangyong Shan, Yang Luo, Zheng Liu, Xing Zhu, Zheyu Fang
The manipulation of light in an integrated circuit is crucial for the developing of high speed electro-optic device. Recently, molybdenum disulfide (MoS2) monolayers generated broad interests for the opto-electronics because of its huge exciton binding energy, tunable optical emission, direct electronic bandgap structure, etc. Miniaturization and multi-functionality of the electro-optic device further requires the manipulation of light-matter interaction at single nanoparticle level. The strong exciton-plasmon interaction that generated between the MoS2 monolayers and metallic nanostructures, may be a possible solution for the compact electro-optic device at nanoscale...
September 1, 2017: ACS Nano
Sung Young Park, Sang-Ho Song, Brandon Palmateer, Akash Pal, Eric D Petersen, Gabrielle P Shall, Ryan M Welchko, Keiji Ibata, Atsushi Miyawaki, George J Augustine, Ute Hochgeschwender
Previous work has demonstrated that fusion of a luciferase to an opsin, to create a luminescent opsin or luminopsin, provides a genetically encoded means of manipulating neuronal activity via both chemogenetic and optogenetic approaches. Here we have expanded and refined the versatility of luminopsin tools by fusing an alternative luciferase variant with high light emission, Gaussia luciferase mutant GLucM23, to depolarizing and hyperpolarizing channelrhodopsins with increased light sensitivity. The combination of GLucM23 with Volvox channelrhodopsin-1 produced LMO4, while combining GLucM23 with the anion channelrhodopsin iChloC yielded iLMO4...
September 1, 2017: Journal of Neuroscience Research
Marie François, Emily Qualls-Creekmore, Hans-Rudolf Berthoud, Heike Münzberg, Sangho Yu
There is renewed interest in leveraging the thermogenic capacity of brown adipose tissue (BAT) and browning of white adipose tissue (WAT) to improve energy balance and prevent obesity. In addition to these effects on energy expenditure, both BAT and WAT secrete large numbers of hormones and cytokines that play important roles in maintaining metabolic health. Both BAT and WAT are densely innervated by the sympathetic nervous system (SNS) and this innervation is crucial for BAT thermogenesis and WAT browning, making it a potentially interesting target for manipulating energy balance and treatment of obesity and metabolic disease...
August 30, 2017: Physiology & Behavior
Eric S Muckley, Christopher B Jacobs, Keith Vidal, Nickolay V Lavrik, Bobby G Sumpter, Ilia N Ivanov
Aqueous solubility of copper phthalocyanine-3,4',4″,4″'-tetrasulfonic acid tetrasodium salt (CuPcTs) enables fabrication of flexible electronic devices by low cost inkjet printing. We (1) investigate water adsorption kinetics on CuPcTs for better understanding the effects of relative humidity (RH) on hydrophilic phthalocyanines, and (2) assess CuPcTs as a humidity-sensing material. Reaction models show that H2O undergoes 2-site adsorption which can be represented by a pair of sequentially-occurring pseudo-first order reactions...
August 30, 2017: Scientific Reports
Packiyaraj Perumal, Chelladurai Karuppiah, Wei-Cheng Liao, Yi-Rou Liou, Yu-Ming Liao, Yang-Fang Chen
Integrating different dimentional materials on vertically stacked p-n hetero-junctions have facinated a considerable scrunity and can open up excellent feasibility with various functionalities in opto-electronic devices. Here, we demonstrate that vertically stacked p-GaN/SiO2/n-MoS2/Graphene heterostructures enable to exhibit prominent dual opto-electronic characteristics, including efficient photo-detection and light emission, which represents the emergence of a new class of devices. The photoresponsivity was found to achieve as high as ~10...
August 30, 2017: Scientific Reports
Zuocheng Zhang, Likai Li, Jason Horng, Nai Zhou Wang, Fangyuan Yang, Yijun Yu, Yu Zhang, Guorui Chen, Kenji Watanabe, Takashi Taniguchi, Xian Hui Chen, Feng Wang, Yuanbo Zhang
Energy bandgap largely determines the optical and electronic properties of a semiconductor. Variable bandgap therefore makes versatile functionality possible in a single material. In layered material black phosphorus, the bandgap can be modulated by the number of layers; as a result, few-layer black phosphorus has discrete bandgap values that are relevant for optoelectronic applications in the spectral range from red, in monolayer, to mid-infrared in the bulk limit. Here, we further demonstrate continuous bandgap modulation by mechanical strain applied through flexible substrates...
September 11, 2017: Nano Letters
Giovanni M Vanacore, Jianbo Hu, Wenxi Liang, Sergio Bietti, Stefano Sanguinetti, Fabrizio Carbone, Ahmed H Zewail
Understanding the dynamics of atomic vibrations confined in quasi-zero dimensional systems is crucial from both a fundamental point-of-view and a technological perspective. Using ultrafast electron diffraction, we monitored the lattice dynamics of GaAs quantum dots-grown by Droplet Epitaxy on AlGaAs-with sub-picosecond and sub-picometer resolutions. An ultrafast laser pulse nearly resonantly excites a confined exciton, which efficiently couples to high-energy acoustic phonons through the deformation potential mechanism...
July 2017: Structural Dynamics (Melville, N.Y.)
Lei Zhang, Songlin Li, Marco A Squillaci, Xiaolan Zhong, Yifan Yao, Emanuele Orgiu, Paolo Samorì
The use of biomimetic approaches toward the production of nonsolid yet functional architectures holds potential for the emergence of novel device concepts. Gels, in particular those obtained via self-assembly of π-conjugated molecules, are dynamic materials possessing unique (opto)electronic properties. Their adaptive nature imparts unprecedented responsivity to various stimuli. Hitherto, a viable device platform to electrically probe in situ a sol-gel transition is still lacking. Here we describe the fabrication of a sub-micrometer electrodic cavity, which enables low-voltage electrical operation of π-gels...
September 5, 2017: Journal of the American Chemical Society
Ana María Porcel-Gálvez, Rocío Romero-Castillo, Elena Fernández-García, Sergio Barrientos-Trigo
PURPOSE: The aim of this study is to evaluate the psychometric properties of INTEGRARE, an instrument based on Nursing Outcome Classification. METHOD: A multicenter, cross-sectional, methodological design was used. FINDINGS: The study included 3,835 patients. Internal consistency α = 0.86. Confirmatory factor analysis demonstrated the unidimensionality of the scale, indicating a good model fit (CMIN/DF = 4; GFI, CFI, NFI, IFI = 0.999; RMSEA = 0...
August 21, 2017: International Journal of Nursing Knowledge
Céline A S Burel, Ahmed Alsayed, Ludivine Malassis, Christopher B Murray, Bertrand Donnio, Rémi Dreyfus
Efficiently detecting mechanical deformations within materials is critical in a wide range of devices, from micro-electromechanical systems to larger structures in the aerospace industry. This communication reports the fabrication of new mechanochromic micrometer-size capsules enabling the detection of strains. These microcapsules are synthesized using an emulsification approach. They are made of densely packed gold nanoparticles embedded in a spherical silica crust. Billions of these composite spherical microcapsules are fabricated in a single batch...
August 21, 2017: Small
Intu Sharma, B R Mehta
Integration of a layered two-dimensional (2D) material with non-2D material provides a platform where one can modulate and achieve properties desired for various next-generation electronic and opto-electronic applications. Here, we investigate ZnTe nanoparticles/MoS2 hetero-interfaces with thickness of MoS2 varying from a few to multilayers. High resolution transmission electron microscopy has been used to observe crystalline behaviour of ZnTe nanoparticles while numbers of layers of MoS2 are investigated using Raman measurements...
August 23, 2017: Nanotechnology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"