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Light trap

Jianyu Gong, Chung-Seop Lee, Eun-Ju Kim, Jae-Hwan Kim, Woojin Lee, Yoon-Seok Chang
In this study, we synthesized a novel perovskite nanomaterial consisting of AgBiO3 nanoparticles (NPs) via an ion-exchange method for remediation of polluted environments. The AgBiO3 NPs could self-produce significant amounts of reactive oxygen species (ROS) without light illumination or any other additional oxidant due to the controllable release of lattice oxygen from the crystalline AgBiO3, resulting in the formation of ROS somehow. The self-produced 1O2, O2•- and •OH were confirmed by electron spin resonance spectroscopy using a spin trap technique...
August 14, 2017: ACS Applied Materials & Interfaces
Fangxiao Wang, Yanglin Chen, Rongshu Zhu, Jianmin Sun
Magnetic visible-light-driven photocatalyst, porous C/ZnFe2O4 (denoted as C/ZFO-CE) was fabricated via a CO2-mediated ethanol route. CO2-mediated ethanol route largely mitigated the solvent strength and facilitated the homogenous deposition of ZnFe2O4 (ZFO) through the coordination of metallic cation with CO3(2-) and HCO3(-) anions, which were hydrolyzed from CO2 and H2O, thereby avoiding additional precipitant. Moreover, the HCO3(-), CO3(2-) and NO3(-) in the system acted as templates for the formation of porous C avoiding the additional organic mesoporous templates, thus reducing the synthesis cost...
August 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Bin Wang, Jun Di, Gaopeng Liu, Sheng Yin, Jiexiang Xia, Qi Zhang, Huaming Li
Sustainable mesoporous graphitic carbon nitride (mpg-C3N4) modified PbBiO2Br porous microsphere (mpg-C3N4/PbBiO2Br) had been successfully synthesized via solvothermal process. Multiple techniques were applied to explore the structure, morphology, optical and electronic properties of the as-prepared photocatalysts. It could be found that the mpg-C3N4 was uniformly distributed on the surface of the PbBiO2Br porous microsphere. Compared with the pure PbBiO2Br, the mpg-C3N4/PbBiO2Br exhibited superior photocatalytic activity for the degradation of organic pollutants under visible light irradiation...
July 27, 2017: Journal of Colloid and Interface Science
E A Lukina, E Suturina, E Reijerse, W Lubitz, L V Kulik
Light-induced processes in composites of semiconducting polymers and fullerene derivatives have been widely studied due to their usage as active layers of organic solar cells. However the process of charge separation under light illumination - the key process of an organic solar cell is not well understood yet. Here we report a Q-band pulse electron paramagnetic resonance study of composites of the fullerene derivative PC60BM ([6,6]-phenyl-C61-butyric acid methyl ester) with different p-type semiconducting polymers regioregular and regiorandom P3HT (poly(3-hexylthiophene-2,5-diyl), MEH-PPV (poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]), PCDTBT (poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)]), PTB7 (poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}))), resulting in a detailed description of the in-phase laser flash-induced electron spin echo (ESE) signal...
August 10, 2017: Physical Chemistry Chemical Physics: PCCP
Daniel Prochowicz, Pankaj Yadav, Michael Saliba, Marcin Saski, Shaik M Zakeeruddin, Janusz Lewiński, Michael Grätzel
Organo-lead halide perovskites have emerged as promising light harvesting materials for solar cells. The ability to prepare high quality films with a low concentration of defects is essential for obtaining high device performance. Here, we advance the procedure for the fabrication of efficient perovskite solar cells (PSCs) based on mechanochemically synthesized MAPbI3. The use of mechano-perovskite for the thin film formation provides a high degree of control of the stoichiometry and allows for the growth of relatively large crystalline grains...
August 16, 2017: ACS Applied Materials & Interfaces
Gede W P Adhyaksa, Eric Johlin, Erik C Garnett
Tandem photovoltaics, combining absorber layers with two distinct band gap energies into a single device, provide a practical solution to reduce thermalization losses in solar energy conversion. Traditionally, tandem devices have been assembled using two-terminal (2-T) or four-terminal (4-T) configurations; the 2-T limits the tandem performance due to the series connection requiring current matching, while the standard 4-T configuration requires at least three transparent electrical contacts, which reduce the total collected power due to unavoidable parasitic absorption...
August 16, 2017: Nano Letters
Milad Jourshabani, Zahra Shariatinia, Alireza Badiei
Porous CeO2/sulfur-doped g-C3N4 (CeO2/CNS) composites were synthesized by one-pot thermal condensation of thiourea and cerium nitrate as starting materials. The obtained CeO2(x)/CNS composites (x=8.4, 9.5 and 10.4wt%) with different CeO2 contents were characterized by the XRD, FT-IR, XPS, TEM, BET, DRS and PL analyses. The TEM images displayed a nonporous and platelet-like morphology for pure CNS but a nanoporous structure with numerous uniform pore sizes of ∼40nm for the CeO2(9.5)/CNS composite. The XRD phase structures and TEM morphologies confirmed that structural evolution trend and stacking degree of CNS were disrupted in precense of the CeO2 nanoparticles...
July 29, 2017: Journal of Colloid and Interface Science
Narendra Singh, Jai Prakash, Mrinmoy Misra, Ashutosh Sharma, Raju Kumar Gupta
There is a growing interest in multifunctional nanomaterials for the detection as well as degradation of organic contaminants in the water. In this work, we report on the development of dual functional TiO2 nanofibers (TNF) with different tantalum (Ta) doping (1-10 mol%) by a simple electrospinning technique. As-prepared TNF show mesoporous dominant structure, which are favourable for photocatalytic activity due to the presence of catalytic spots. Ta doping decreases the crystalline size within TiO2 matrix due to the incorporation of Ta5+ ions and restricts the phase transformation from anatase to rutile...
August 4, 2017: ACS Applied Materials & Interfaces
Wen-Jeng Ho, Jian-Cheng Lin, Jheng-Jie Liu, Chien-Wu Yeh, Hong-Jhang Syu, Ching-Fuh Lin
In this study, we sought to improve the light trapping of textured silicon solar cells using the plasmonic light scattering of indium nanoparticles (In NPs) of various dimensions. The light trapping modes of textured-silicon surfaces with and without In NPs were investigated at an angle of incidence (AOI) ranging from 0° to 75°. The optical reflectance, external quantum efficiency (EQE), and photovoltaic performance were first characterized under an AOI of 0°. We then compared the EQE and photovoltaic current density-voltage (J-V) as a function of AOI in textured silicon solar cells with and without In NPs...
July 1, 2017: Materials
Oren Lotan, Jonathan Bar-David, Cameron L C Smith, Sharon Yagur-Kroll, Shimshon Belkin, Anders Kristensen, Uriel Levy
We experimentally demonstrate the interrogation of an individual Escherichia coli cell using a nanoscale plasmonic V-groove waveguide. Several different configurations were studied. The first involved the excitation of the cell in a liquid environment because it flows on top of the waveguide nanocoupler, while the obtained fluorescence is coupled into the waveguide and collected at the other nanocoupler. The other two configurations involved the positioning of the bacterium within the nanoscale waveguide and its excitation in a dry environment either directly from the top or through waveguide modes...
August 8, 2017: Nano Letters
Soumya Radhakrishnan, Joel Mieres Perez, Murthy S Gudipati, Wolfram Sander
The benzhydryl radical is generated in high yields by flash vacuum thermolysis of 1,1,2,2-tetraphenylethane with subsequent trapping of the product in argon or amorphous water at 3 - 4 K. Photoionization of the radical with various UV light and electron sources produces the benzhy-dryl cation which was identified by IR and UV-vis spectroscopy. In solid argon, the formation of the benzhydryl cation is irreversible, whereas in amorphous water ice the electron transfer is reversible, and irradiation into the major absorption band at 443 nm of the cation leads back to the radical by electron attachment...
August 3, 2017: Journal of Physical Chemistry. A
Michal Magott, Olaf Stefanczyk, Barbara Sieklucka, Dawid Pinkowicz
Huge increase of the magnetization upon 436 nm irradiation is recorded for two coordination chains based on tetravalent octacyanidometallates (WIV and MoIV), while no change is observed for the NbIV-analogue. The photomagnetic behavior based solely on [WIV(CN)8]4- is demonstrated for the first time. The observed behaviour is attributed to the Light-Induced Excited Spin State Trapping (LIESST) at the octacyanidometallate and to the resulting magnetic exchange ON/OFF photo-switching between the MnII and the photo-induced high-spin (S = 1) WIV or MoIV...
August 2, 2017: Angewandte Chemie
Luis Paulo Costa Carvalho, Emanuelle de Sousa Farias, Luiz Herman Soares Gil, Felipe Arley Costa Pessoa, Jansen Fernandes Medeiros
BACKGROUND: Culicoides biting midges are small insects that are proven vectors of pathogens that cause disease in animals and humans. There are 1,368 species of Culicoides in the world, including 149 species in Brazil and 122 species in the Brazilian Amazon Basin. This study documents specimens that were collected between 2013 and 2015 in the municipalities of Alvorada d'Oeste, Buritis, Cacoal, Costa Marques, Espigão d'Oeste, Guajará-Mirim, Pimenta Bueno, Porto Velho and São Francisco Guaporé...
2017: Biodiversity Data Journal
Estela González, Maribel Jiménez, Sonia Hernández, Inés Martín-Martín, Ricardo Molina
BACKGROUND: An unusual increase of human leishmaniasis cases due to Leishmania infantum is occurring in an urban area of southwestern Madrid, Spain, since 2010. Entomological surveys have shown that Phlebotomus perniciosus is the only potential vector. Direct xenodiagnosis in hares (Lepus granatensis) and rabbits (Oryctolagus cuniculus) collected in the focus area proved that they can transmit parasites to colonized P. perniciosus. Isolates were characterized as L. infantum. The aim of the present work was to conduct a comprehensive study of sand flies in the outbreak area, with special emphasis on P...
August 1, 2017: Parasites & Vectors
Bo Lu, Dajun Wang
We present a four-pass acousto-optic modulator (AOM) system for providing the repumping light for laser cooling of sodium atoms. With only one 400 MHz AOM, we achieve a tunable laser frequency shift around 1.6 GHz with total efficiency up to 30%. This setup provides an alternative over conventional methods to generate a sodium repumping light using more expensive high frequency AOMs or electro-optical modulators (EOMs) in the GHz domain. This compact and reliable setup can be easily adapted to other frequencies and may find applications in laser spectroscopy, laser cooling and trapping, and coherent manipulation of atomic quantum states...
July 2017: Review of Scientific Instruments
Chun Che Lin, Yi-Ting Tsai, Hannah E Johnston, Mu-Huai Fang, Fengjiao Yu, Wuzong Zhou, Pamela Whitfield, Ye Li, Jing Wang, Ru-Shi Liu, J Paul Attfield
Optimizing properties of phosphors for use in white-light-emitting diodes (WLEDs) is an important materials challenge. Most phosphors have a low level of lattice disorder due to mismatch between the host and activator cations. Here we show that deliberate introduction of high levels of cation disorder leads to significant improvements in quantum efficiency, stability to thermal quenching, and emission lifetime in Sr1.98-x(Ca0.55Ba0.45)xSi5N8:Eu0.02 (x = 0-1.5) phosphors. Replacing Sr by a (Ca0.55Ba0.45) mixture with the same average radius increases cation size variance, resulting in photoluminescence emission increases of 20-26% for the x = 1...
August 16, 2017: Journal of the American Chemical Society
Csongor I Gedeon, Norbert Flórián, Péter Liszli, Beáta Hambek-Oláh, Oxána Bánszegi, Judit Schellenberger, Miklós Dombos
Methods to estimate density of soil-dwelling arthropods efficiently, accurately and continuously are critical for investigating soil biological activity and evaluating soil management practices. Soil-dwelling arthropods are currently monitored manually. This method is invasive, and time- and labor-consuming. Here we describe an infrared opto-electronic sensor for detection of soil microarthropods in the size range of 0.4-10 mm. The sensor is built in a novel microarthropod trap designed for field conditions...
August 1, 2017: Sensors
Lorenzo Caranzi, Giuseppina Pace, Mauro Sassi, Luca Beverina, Mario Caironi
Organic materials are suitable for light sensing devices showing unique features such as low cost, large area and flexibility. Moreover, transparent photodetectors are interesting for smart interfaces, windows and display-integrated electronics. The ease of depositing ultra-thin organic films with simple techniques enables low light absorbing active layers, resulting in the realization of transparent devices. Here, we demonstrate a strategy to obtain high efficiency organic photodetectors and phototransistors based on transparent active layers with a visible transmittance higher than 90 %...
July 28, 2017: ACS Applied Materials & Interfaces
Morgane Vacher, Pooria Farahani, Alessio Valentini, Luis Manuel Frutos, Hans O Karlsson, Ignacio Fernández Galván, Roland Lindh
Chemiluminescence is the emission of light as a result of a non-adiabatic chemical reaction. The present work is concerned with understanding the yield of chemiluminescence, in particular how it dramatically increases upon methylation of 1,2-dioxetane. Both ground-state and non-adiabatic dynamics (including singlet excited states) of the decomposition reaction of various methyl-substituted dioxetanes have been simulated. Methyl-substitution leads to a significant increase in the dissociation half-life. The rotation around the O-C-C-O dihedral angle is slowed down and thus, the molecular system stays longer in the "entropic trap" region...
July 27, 2017: Journal of Physical Chemistry Letters
F A Noguera, M A Ortega-Huerta, S Zaragoza-Caballero, E González-Soriano, E Ramírez-García
Cerambycidae have an important ecological role in initiating the degradation process of dead wood, but few studies have evaluated Cerambycidae community attributes in relation to ecosystem phenology. We surveyed the cerambicid fauna of the tropical dry forest in Huatulco, Oaxaca, Mexico, and explored the relationship of Cerambycidae species richness and abundance with phenological changes in vegetation. We applied three collecting methods of light traps, direct collection, and Malaise traps to survey Cerambycidae throughout 2005...
July 26, 2017: Neotropical Entomology
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