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https://www.readbyqxmd.com/read/29345248/photo-assisted-hysteresis-of-electronic-transport-for-zno-nanowire-transistors
#1
Qianqian Du, Jiandong Ye, Zhonghua Xu, Shunming Zhu, Kun Tang, Shulin Gu, Youdou Zheng
Recently, ZnO nanowire field effect transistors (FETs) have received renewed interest due to their extraordinary low dimensionality and high sensitivity to external chemical environment and illumination conditions. These prominent properties have the promising potential in the nanoscale chemical and photo-sensors. In this article, we have fabricated ZnO nanowire FETs and have found hysteresis behaviors in their transfer characteristics. The mechanism and dynamics of the hysteresis phenomena have been investigated in detail by varying the sweeping rate and range of the gate bias with and without light irradiation...
January 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29341604/ce3-doping-to-modulate-photoluminescence-kinetics-for-efficient-cspbbr3-nanocrystals-based-light-emitting-diodes
#2
Jisong Yao, Jing Ge, Bo-Ning Han, Kun-Hua Wang, Hong-Bin Yao, Hao-Lei Yu, Jian-Hai Li, Bai-Sheng Zhu, Jizhong Song, Chen Chen, Qun Zhang, Haibo Zeng, Yi Luo, Shu-Hong Yu
Inorganic perovskite CsPbBr3 nanocrystals (NCs) are emerging, highly attractive light emitters with high color purity and good thermal stability for light-emitting diodes (LEDs). Their high photo/electroluminescence efficiencies are very important for fabricating efficient LEDs. Here, we propose a novel strategy to enhance the photo/electroluminescence efficiency of CsPbBr3 NCs through doping of heterovalent Ce3+ ions via a facile hot-injection method. The Ce3+ cation was chosen as the dopant for CsPbBr3 NCs by virtue of its similar ion radius and formation of higher energy level of conduction band with bromine in comparison with the Pb2+ cation to maintain the integrity of perovskite structure without introducing additional trap states...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29340391/graphene-on-116-faceted-monocrystalline-anatase-nanosheet-array-for-ultraviolet-detection
#3
Yu Liu, Honglei Cai, Fangfang Wang, Jianlin Wang, Qiuping Huang, Zhengping Fu, Yalin Lu
A structure composed of a nanosheet array may trap photons, which could be used to enhance the optical response via resonances; this may be highly useful in ultraviolet (UV) detection, photocatalysis, solar cells, etc. Moreover, anatase nanosheets exposed with the active {001}, {111}, and {116} facets are promising in applications such as Li-ion battery, photocatalysis, and electrochemistry. Therefore, in this study, the {116} faceted single-crystalline anatase nanosheet array with the sheet spacing in the range of several hundred nanometers was directly grown on the transparent conductive substrates...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340303/highly-mobile-charge-transfer-excitons-in-two-dimensional-ws2-tetracene-heterostructures
#4
Tong Zhu, Long Yuan, Yan Zhao, Mingwei Zhou, Yan Wan, Jianguo Mei, Libai Huang
Charge-transfer (CT) excitons at heterointerfaces play a critical role in light to electricity conversion using organic and nanostructured materials. However, how CT excitons migrate at these interfaces is poorly understood. We investigate the formation and transport of CT excitons in two-dimensional WS2/tetracene van der Waals heterostructures. Electron and hole transfer occurs on the time scale of a few picoseconds, and emission of interlayer CT excitons with a binding energy of ~0.3 eV has been observed...
January 2018: Science Advances
https://www.readbyqxmd.com/read/29338711/blood-parasite-infections-in-a-wild-population-of-ravens-corvus-corax-in-bulgaria
#5
Peter Shurulinkov, Lachezar Spasov, Georgi Stoyanov, Nayden Chakarov
BACKGROUND: Blood parasites have been studied intensely in many families of avian hosts, but corvids, a particularly cosmopolitan family, remain underexplored. Haemosporidian parasites of the common raven (Corvus corax) have not been studied, although it is the largest, most adaptable, and widespread corvid. Genetic sequence data from parasites of ravens can enhance the understanding of speciation patterns and specificity of haemosporidian parasites in corvids, and shed light how these hosts cope with parasite pressure...
January 16, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29334656/activated-protein-c-suppresses-osteoclast-differentiation-via-endothelial-protein-c-receptor-protease-activated-receptor-1-sphingosine-1-phosphate-receptor-and-apolipoprotein-e-receptor-2
#6
Kakunoshin Yoshida, Nobuyuki Akita, Takayuki Okamoto, Kunihiro Asanuma, Atsumasa Uchida, Akihiro Sudo, Motomu Shimaoka, Koji Suzuki, Tatsuya Hayashi
INTRODUCTION: Bone remodeling relies on a delicate balance between formation and resorption of bone tissues, processes in which bone-forming osteoblasts and bone-resorbing osteoclasts play central roles. Recently, we reported that anticoagulant activated protein C (APC) promotes osteoblast proliferation, but the role of the blood coagulation system in bone remodeling remains unclear. In this study, to further elucidate the relationship between bone remodeling and blood coagulation, we investigated the effect of APC on osteoclast differentiation...
January 3, 2018: Thrombosis Research
https://www.readbyqxmd.com/read/29328189/massive-ordering-and-alignment-of-cylindrical-micro-objects-by-photovoltaic-optoelectronic-tweezers
#7
Iris Elvira, Juan F Muñoz-Martínez, Álvaro Barroso, Cornelia Denz, José B Ramiro, Angel García-Cabañes, Fernando Agulló-López, Mercedes Carrascosa
Optical tools for manipulation and trapping of micro- and nano-objects are a fundamental issue for many applications in nano- and biotechnology. This work reports on the use of one such method, known as photovoltaic optoelectronics tweezers, to orientate and organize cylindrical microcrystals, specifically elongated zeolite L, on the surface of Fe-doped LiNbO3 crystal plates. Patterns of aligned zeolites have been achieved through the forces and torques generated by the bulk photovoltaic effect. The alignment patterns with zeolites parallel or perpendicular to the substrate surface are highly dependent on the features of light distribution and crystal configuration...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328097/temperature-dependence-of-brewster-s-angle
#8
Wei Guo
In this work, a dielectric at a finite temperature is modeled as an ensemble of identical atoms moving randomly around where they are trapped. Light reflection from the dielectric is then discussed in terms of atomic radiation. Specific calculation demonstrates that because of the atoms' thermal motion, Brewster's angle is, in principle, temperature-dependent, and the dependence is weak in the low-temperature limit. What is also found is that the Brewster's angle is nothing but a result of destructive superposition of electromagnetic radiation from the atoms...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29327454/ultrafast-all-optical-switching-of-germanium-based-flexible-metaphotonic-devices
#9
Wen Xiang Lim, Manukumara Manjappa, Yogesh Kumar Srivastava, Longqing Cong, Abhishek Kumar, Kevin F MacDonald, Ranjan Singh
Incorporating semiconductors as active media into metamaterials offers opportunities for a wide range of dynamically switchable/tunable, technologically relevant optical functionalities enabled by strong, resonant light-matter interactions within the semiconductor. Here, a germanium-thin-film-based flexible metaphotonic device for ultrafast optical switching of terahertz radiation is experimentally demonstrated. A resonant transmission modulation depth of 90% is achieved, with an ultrafast full recovery time of 17 ps...
January 12, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29327385/ultrathin-semiconductor-superabsorbers-from-the-visible-to-the-near-infrared
#10
Pau Molet, Juan Luis Garcia-Pomar, Cristiano Matricardi, Miquel Garriga, Maria Isabel Alonso, Agustín Mihi
The design of ultrathin semiconducting materials that achieve broadband absorption is a long-sought-after goal of crucial importance for optoelectronic applications. To date, attempts to tackle this problem consisted either of the use of strong-but narrowband-or broader-but moderate-light-trapping mechanisms. Here, a strategy that achieves broadband optimal absorption in arbitrarily thin semiconductor materials for all energies above their bandgap is presented. This stems from the strong interplay between Brewster modes, sustained by judiciously nanostructured thin semiconductors on metal films, and photonic crystal modes...
January 12, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29325101/fauna-ecological-characteristics-and-checklist-of-the-mosquitoes-in-mazandaran-province-northern-iran
#11
Seyed Hassan Nikookar, Mahmoud Fazeli-Dinan, Shahyad Azari-Hamidian, Seyed Nouraddin Mousavi Nasab, Mohsen Aarabi, Seyyed Payman Ziapour, Ahmadali Enayati, Janet Hemingway
Mosquitoes are important vectors of human and animal diseases. This study updates current knowledge on fauna, dominance, and distribution of mosquitoes in Mazandaran Province, Northern Iran, to inform disease control effort. Larval collections, using standard dippers or droppers, and adult collections, using total catches, shelter pits, CDC light traps, and human landing catches, were performed monthly in 30 villages across 16 counties, from May to December 2014. Ovitraps, baited with hay infusion as oviposition attractants or stimulants for Aedes (Stegomyia) mosquitoes, were installed in each village and inspected weekly for eggs...
January 6, 2018: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29324270/agcl-ag3po4-a-stable-ag-based-nanocomposite-photocatalyst-with-enhanced-photocatalytic-activity-for-the-degradation-of-parabens
#12
Jianhao Guo, Huixian Shi, Xiaobo Huang, Huifang Shi, Zhongfu An
An AgCl/Ag3PO4 composite has been successfully fabricated by a simple desorption-precipitation method. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV/Vis), and photoluminescence (PL) have been used to study the structural and physicochemical characteristics of the AgCl/Ag3PO4 composite. The photocatalytic activity of the AgCl/Ag3PO4 composite has been tested by the degradation of parabens under visible-light irradiation...
January 4, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29322056/field-evaluation-of-outdoor-ultra-low-volume-ulv-applications-against-phlebotomine-sand-flies-diptera-psychodidae-in-al-rabta-north-west-of-libya
#13
Mostafa Ramahdan Dokhan, Mohamed Amin Kenawy, Taher Shaibi, Badereddin Bashir Annajar
Background: Al Rabta is a rural area in the North-West of Libya that represents an important focus of zoonotic cutaneous leishmaniasis. This study aimed to evaluate the effect of Ultra Low Volume (ULV) applications in controlling sand flies and its impact on leishmaniasis transmission in this area. Methods: Two neighboring villages were selected: Al Rabta West (RW) as cypermethrin treated village and Al Rabta East (RE) as check one. The ULV was evaluated through 3 spraying cycles during Apr, Jun and Sep 2013...
September 2017: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/29320684/label-free-imaging-and-bending-analysis-of-microtubules-by-rocs-microscopy-and-optical-trapping
#14
Matthias D Koch, Alexander Rohrbach
Mechanical manipulation of single cytoskeleton filaments and their monitoring over long times is difficult because of fluorescence bleaching or phototoxic protein degradation. The integration of label-free microscopy techniques, capable of imaging freely diffusing, weak scatterers such as microtubules (MTs) in real-time, and independent of their orientation, with optical trapping and tracking systems, would allow many new applications. Here, we show that rotating-coherent-scattering microscopy (ROCS) in dark-field mode can also provide strong contrast for structures far from the coverslip such as arrangements of isolated MTs and networks...
January 9, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29320544/diversity-patterns-leishmania-dna-detection-and-bloodmeal-identification-of-phlebotominae-sand-flies-in-villages-in-northern-colombia
#15
Camila González, Cielo León, Andrea Paz, Marla López, Gisell Molina, Diana Toro, Mario Ortiz, Juan Manuel Cordovez, María Claudia Atencia, Germán Aguilera, Catalina Tovar
Leishmaniases are neglected tropical diseases exhibiting complex transmission cycles due to the number of parasite species circulating, sand fly species acting as vectors and infected mammals, including humans, which are defined in the New World as accidental hosts. However, current transmission scenarios are changing, and the disease is no longer exclusively related to forested areas but urban transmission foci occur, involving some species of domestic animals as suspected reservoirs. The aim of this study was to determine the transmission cycles in urban environments by evaluating sand fly diversity, detection of Leishmania DNA, and bloodmeal sources through intra and peridomestic collections...
2018: PloS One
https://www.readbyqxmd.com/read/29318675/toward-an-aqueous-solar-battery-direct-electrochemical-storage-of-solar-energy-in-carbon-nitrides
#16
Filip Podjaski, Julia Kröger, Bettina V Lotsch
Graphitic carbon nitrides have emerged as an earth-abundant family of polymeric materials for solar energy conversion. Herein, a 2D cyanamide-functionalized polyheptazine imide (NCN-PHI) is reported, which for the first time enables the synergistic coupling of two key functions of energy conversion within one single material: light harvesting and electrical energy storage. Photo-electrochemical measurements in aqueous electrolytes reveal the underlying mechanism of this "solar battery" material: the charge storage in NCN-PHI is based on the photoreduction of the carbon nitride backbone and charge compensation is realized by adsorption of alkali metal ions within the NCN-PHI layers and at the solution interface...
January 10, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29317875/diagnostic-accuracy-of-loop-mediated-isothermal-amplification-assay-as-a-field-molecular-tool-for-rapid-mass-screening-of-old-world-leishmania-infections-in-sand-flies-and-in-vitro-culture
#17
Mehdi Ghodrati, Adel Spotin, Teimour Hazratian, Mahmoud Mahami-Oskouei, Ali Bordbar, Sahar Ebrahimi, Shirzad Fallahi, Parviz Parvizi
Background: We employed a highly sensitive loop-mediated isothermal amplification (LAMP) by targeting 18S rRNA gene to identify the rapid mass screening of Leishmania infections in captured sand flies of southwest Iran and In vitro culture. Methods: One hundred fifty sand flies were collected from 11 sites adjacent to Iraqi's borders in southern parts of Khuzestan Province by using sticky sheets of paper and CDC miniature light traps during late May 2014 to Nov 2015...
October 2017: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/29316967/ecological-distribution-and-population-dynamics-of-rift-valley-fever-virus-mosquito-vectors-diptera-culicidae-in-senegal
#18
Biram Biteye, Assane G Fall, Mamadou Ciss, Momar T Seck, Andrea Apolloni, Moussa Fall, Annelise Tran, Geoffrey Gimonneau
BACKGROUND: Many zoonotic infectious diseases have emerged and re-emerged over the last two decades. There has been a significant increase in vector-borne diseases due to climate variations that lead to environmental changes favoring the development and adaptation of vectors. This study was carried out to improve knowledge of the ecology of mosquito vectors involved in the transmission of Rift Valley fever virus (RVFV) in Senegal. METHODS: An entomological survey was conducted in three Senegalese agro-systems, Senegal River Delta (SRD), Senegal River Valley (SRV) and Ferlo, during the rainy season (July to November) of 2014 and 2015...
January 9, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29316534/noble-metal-sandwich-like-tio2-pt-c3n4-hollow-spheres-enhance-photocatalytic-performance
#19
Jiabai Cai, Xueqing Wu, Yuehai Li, Ye Lin, Hui Yang, Shunxing Li
The goal of this work was to assess the performance of Pt nanoparticles (NPs) as co-catalysts on the photocatalytic activity of TiO2@Pt@C3N4 hollow spheres, which was tested by photodegrading rhodamine B and methyl blue under visible light irradiation. TiO2@Pt@C3N4 composites were fabricated by using modified polystyrene balls as templates, hydrothermal reactions, and calcination. Under simulated sunlight irradiation, photocatalytic activity was in the following of TiO2@Pt@C3N4 > TiO2@C3N4 > C3N4 > P25...
January 4, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29316393/reversible-and-efficient-light-induced-molecular-switching-on-an-insulator-surface
#20
Simon Jaekel, Antje Richter, Robert Lindner, Ralf Bechstein, Christophe Nacci, Stefan Hecht, Angelika Kuhnle, Leonhard Grill
Prototypical molecular switches such as azobenzenes exhibit two states, i.e. trans and cis, with different characteristic physical properties. In recent years various derivatives were investigated on metallic surfaces. However, bulk insulators as supporting substrate reveal important advantages since they allow electronic decoupling from the environment, which is key to control the switching properties. Here, we report on the light-induced isomerization of an azobenzene derivative on a bulk insulator surface, in this case calcite (101 ̅4), studied by atomic force microscopy with submolecular resolution...
January 9, 2018: ACS Nano
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