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Photo sensitivity

Yuanjin Zhan, Jingjing Yan, Mei Wu, Longhua Guo, Zhenyu Lin, Bin Qiu, Guonan Chen, Kwok-Yin Wong
Hexagonal boron nitride nanosheets (BNNS), one kind of inorganic graphene analogue, exhibit high fluorescence quenching ability via the photo-induced electron transfer (PET) and different affinity toward single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA). As a proof of concept, the BNNS was first used as a sensing platform for the rapid detection of DNA and small molecules with high sensitivity and selectivity in this study. This strategy is versatile and quick fluorescence sensing of DNA and extensive DNA related analytes such as metal cations and small molecules...
November 1, 2017: Talanta
Jinhui Feng, Yueyun Li, Zengqiang Gao, Hui Lv, Xiaobo Zhang, Dawei Fan, Qin Wei
A label-free photoelectrochemical (PEC) platform with high visible-light activity for quantitative detection of the ochratoxin A (OTA) was developed by assembly of Ag2S nanoparticles (NPs) sensitized on titanium dioxide/red blood cell-like shape bismuth vanadate (TiO2/S-BiVO4) electrode via layer-by-layer (LBL) strategy. In this protocol, ascorbic acid was used as an efficient electron donor for scavenging photo-generated holes and inhibiting light driven electron-hole pair recombination. TiO2 has good photoelectric activity and large surface area...
July 13, 2017: Biosensors & Bioelectronics
Joel Thomas Kirner, Richard G Finke
A planar organic thin-film composed of a perylene diimide dye (N,N´-bis(phosphonomethyl)-3,4,9,10-perylenediimide, PMPDI) with photoelectrochemically deposited cobalt oxide (CoOx) catalyst was previously shown to photoelectrochemically oxidize water (DOI: 10.1021/am405598w). Herein, the same PMPDI dye is studied for the sensitization of different nanostructured metal oxide (nano-MOₓ) films in a dye-sensitized photoelectrochemical cell architecture. Dye adsorption kinetics and saturation decreases in the order TiO₂ > SnO₂ > WO₃...
July 20, 2017: ACS Applied Materials & Interfaces
Jonathan Yeow, Cyrille Boyer
The polymerization-induced self-assembly (PISA) process is a useful synthetic tool for the efficient synthesis of polymeric nanoparticles of different morphologies. Recently, studies on visible light initiated PISA processes have offered a number of key research opportunities that are not readily accessible using traditional thermally initiated systems. For example, visible light mediated PISA (Photo-PISA) enables a high degree of control over the dispersion polymerization process by manipulation of the wavelength and intensity of incident light...
July 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Tak-Wah Wong, Chien-Wei Cheng, Zong-Jhe Hsieh, Ji-Yuan Liang
The light sensitive compound riboflavin-5'-phosphate (or flavin mononucleotide, FMN) generates reactive oxygen species (ROS) upon photo-irradiation. FMN is required by all flavoproteins because it is a cofactor of biological blue-light receptors. The photochemical effects of FMN after irradiation by blue or violet light on the inactivation of Staphylococcus aureus strains, including a methicillin-resistant strain (MRSA), were investigated in this study. Upon blue- or violet-light photo-treatment, FMN was shown to inactivate S...
July 12, 2017: Journal of Photochemistry and Photobiology. B, Biology
Basant A Ali, Nageh K Allam
We report density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations on the widely used N3 dye (cis-[Ru(2,2'-bipyridine-4,4'-dicarboxylic acid)2(NCS)2] and its trans isomer with different π-spacers. The study compared the sensitization properties of the two isomers in terms of their electronic properties such as light harvesting efficiency (LHE), absorbed wavelength (λMax) and molecular orbital distribution. Also, charge transfer descriptors, such as the charge transfer distance (D(CT)), dipole moment (μ(CT)), and the amount of charge transferred (q(CT)) were investigated...
July 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Yuting Shi, Jin Wang, Shumin Li, Bo Yan, Hui Xu, Ke Zhang, Yukou Du
In this work, a sensitive and novel method for determining uric acid (UA) has been developed, in which the glassy carbon electrode (GCE) was modified with electrodeposition Au nanoparticles and used to monitor the concentration of UA with the assistant of visible light illumination. The morphology of the Au nanoparticles deposited on GCE surface were characterized by scanning electron microscope (SEM) and the nanoparticles were found to be well-dispersed spheres with the average diameter approaching 26.1 nm...
December 2017: Nanoscale Research Letters
Shu Zhang, Yunfei Tian, Hongling Yin, Yubin Su, Li Wu, Xiandeng Hou, Chengbin Zheng
Currently, no applicable analyzers are available to accomplish online and continuous monitoring of organic pollution, which is one of the most important factors contributing to water shortages around the world, particularly in developing countries. In this work, a sensitive, miniaturized, inexpensive, on-line and continuous non-purgeable organic carbon (NPOC) analysis system was developed for the continuous monitoring of such organic pollution. This system consists of a specially designed and high efficiency UV photo-oxidation vapor generation (HE-POVG) reactor and a miniaturized, low power (7 W) point discharge microplasma optical emission spectrometer (PD-OES)...
July 14, 2017: Environmental Science & Technology
Kishan S Italiya, Saurabh Sharma, Ishit Kothari, Deepak Chitkara, Anupama Mittal
Lisofylline (LSF) is an anti-inflammatory and immunomodulatory agent with proven activity in serious infections associated with cancer chemotherapy, hyperoxia-induced acute lung injury, autoimmune disorders including type-1 diabetes (T1DM) and islet rejection after islet transplantation. It is also an active metabolite of another anti-inflammatory agent, Pentoxifylline (PTX). LSF bears immense therapeutic potential in multiple pharmacological activities and hence appropriate and accurate quantification of LSF is very important...
June 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Ligang Wang, Yuan Huang, Aashir Waleed, Ke Wu, Cong Lin, Zhengxu Wang, Guanhaojie Zheng, Zhiyong Fan, Junliang Sun, Huanping Zhou, Lingdong Sun, Chun-Hua Yan
Among the various building blocks beyond polycrystalline thin films, perovskite wires have attracted extensive attention for potential applications including nano-lasers, wave-guides, field effect transistors, and more. In this work, millimeter-scale lead iodine-based perovskite wires employing various A-site substitutions, namely, Cs, methylammonium (MA), and formamidinium (FA), have been synthesized via a new type solution method with nearly 100% yield. All three millimeter-scale perovskite wires (MPWs) compositions exhibit relatively high quality, and CsPbI3 is proven to be monocrystalline along its entire length...
July 13, 2017: ACS Applied Materials & Interfaces
Wen-Zhuo Zhu, Gui-Peng Yang, Hong-Hai Zhang
Chromophoric dissolved organic matter (CDOM), carbohydrates, and amino acids were analyzed to investigate the photochemistry of total dissolved (<0.22μm) organic matter (DOM), high-molecular-weight (HMW, 1kDa-0.22μm) DOM and low-molecular-weight (LMW, <1kDa) DOM at stations in the Yangtze River and its coastal area, and in the Western Pacific Ocean. Results revealed that the humic-like and tryptophan-like CDOM fluorescent components in riverine, coastal, and oceanic surface waters were photodegraded during irradiation...
July 7, 2017: Science of the Total Environment
Chao Zheng, Guojun Liu, Heng Hu
Past antismudge NP-GLIDE coatings that bear nano-pools of a grafted liquid ingredient for dewetting enablement are cured thermally at high temperatures, which are undesirable for application on heat-sensitive substrates. Reported herein is the development of a UV-curable NP-GLIDE coating. Of the various formulations that have been tested, robust coatings were obtained from only one recipe consisting of a photo-initiator, a trifunctional monomer, and a graft copolymer that bears pendent double bonds and a poly(dimethyl siloxane) (PDMS) side chain as the antismudge agent...
July 10, 2017: ACS Applied Materials & Interfaces
Jacqueline Manina Cole, Martin Blood-Forsythe, Tze-Chia Lin, Philip Pattison, Yun Gong, Alvaro Vázquez-Mayagoitia, Paul G Waddell, Lei Zhang, Nagatoshi Koumura, Shogo Mori
Donor--Acceptor dyes containing thiophenyl -conjugated units and cyanoacrylate acceptor groups are among the best-performing organic chromophores used in dye-sensitized solar cell (DSC) applications. Yet, the molecular origins of their high photovoltaic output have remained unclear until now. This synchrotron-based X-ray diffraction study eluci-dates these origins for the high-performance thiophenylcy-anoacrylate-based dye, MK-2 (7.7% DSC device efficiency), and its molecular building block, MK-44. The crystal struc-tures of MK-2 and MK-44 are both determined, while a high-resolution charge-density mapping of the smaller mole-cule was also possible, enabling the nature of its bonding to be detailed...
July 10, 2017: ACS Applied Materials & Interfaces
Zhen Wang, Min Cao, Lei Yang, Donghua Liu, Dacheng Wei
As a recently developed detection technique, photoelectrochemical (PEC) measurement has received extensive attention. However, owing to the lack of a comprehensive approach to engineer the photo-generated carriers, the performance is still limited. As an example, a significant use of PEC measurement might be in understanding the roles of glutathione in physiological and pathological processes. Here, we developed a new approach for engineering the photo-generated carriers with the aid of the synergic effect of self-doping, surface plasmon resonance, electrical field amplification effect, etc...
July 24, 2017: Analyst
Lalminthang Kipgen, Matthias Bernien, Fabian Nickel, Holger Naggert, Andrew J Britton, Lucas M Arruda, Enrico Schierle, Eugen Weschke, Felix Tuczek, Wolfgang Kuch
For probing the nature of spin-state switching in spin-crossover molecules adsorbed on surfaces, x-ray absorption spectroscopy has emerged as a powerful tool due to its high sensitivity and element selectivity in tracing even subtle electronic, magnetic, or chemical changes. However, the x rays itself can induce a spin transition and might have unwanted influence while investigating the effect of other stimuli such as temperature or light, or of the surface, on the spin switching behavior. Herein, we present the spin switching of an Fe(II) complex adsorbed on a highly oriented pyrolytic graphite surface with particular emphasis on the x-ray-induced switching...
July 7, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Lei Meng, Quan Zhu, Jian-Hang Yin, Na Xu
A simple luminescence sensor, based on polyethyleneimine protected silver nanoclusters (AgNCs@PEI) is successfully fabricated via one-pot reduction method. The obtained AgNCs@PEI are characterized by high-resolution transmission electron microscopy (HR-TEM), Dynamic light scattering (DLS), transient and steady-state fluorescence, and UV-vis spectroscopy. The NCs show large Stocks-shift (∼130nm), high tolerability to extreme pH and high ionic strengths, and excellent photo-stability under UV irradiation, laying the basement for the practical applications...
June 29, 2017: Journal of Photochemistry and Photobiology. B, Biology
Emel Önal, Sevinc Zehra Topal, Ismail Fidan, Savaş Berber, Fabienne Dumoulin, Catherine Hirel
A systematic structure-photoproperties relationship study of the interactions of porphyrin-fullerene dyads with molecular oxygen was conducted on a set of three porphyrin-fullerene dyads, as this approach of related applications - oxygen sensitivity and photo-induced singlet oxygen generation - of such dyads remained to be endeavoured. To promote energy transfers between the porphyrin and fullerene units and limit undesired charge separation, a particular attention was devoted to the choice of the solvents for the photoproperties determination...
June 30, 2017: Journal of Fluorescence
Can Xu, Wei Bing, Faming Wang, Jinsong Ren, Xiaogang Qu
A versatile method for photoregulation of chemical reactions was developed through a combination of near-infrared (NIR) and ultraviolet (UV) light sensitive materials. This regulatory effect was achieved through photoresponsive modulation of reaction temperature and pH values, two prominent factors influencing reaction kinetics. Photothermal nanomaterial graphene oxide (GO) and photobase reagent malachite green carbinol base (MGCB) were selected for temperature and pH regulation, respectively. Using nanocatalyst- and enzyme-mediated chemical reactions as model systems, we demonstrated the feasibility and high efficiency of this method...
July 3, 2017: ACS Nano
A Sciortino, A Madonia, M Gazzetto, L Sciortino, E J Rohwer, T Feurer, F M Gelardi, M Cannas, A Cannizzo, F Messina
Fluorescent carbon nanodots are a novel family of carbon-based nanoscale materials endowed with an outstanding combination of properties that make them very appealing for applications in nanosensing, photonics, solar energy harvesting and photocatalysis. One of the remarkable properties of carbon dots is their strong sensitivity to the local environment, especially to metal ions in solution. These interactions provide a testing ground for their marked photochemical properties, highlighted by many studies, and frequently driven by charge transfer events...
June 29, 2017: Nanoscale
Fabrizio Sordello, Manuel Ghibaudo, Claudio Minero
We report the electrosynthesis of a water oxidation catalyst based on Ag oxides (AgCat). The deposited AgCat is composed of mixed valence crystalline Ag oxides with the presence of particle aggregates whose size is ∼1 μm. This catalyst, coupled with TiO2 and hematite, and under photoelectrochemical conditions, substantially increases photocurrents in a wide range of applied potentials compared with bare and Co-Pi-modified photocatalysts. AgCat can sustain current densities comparable with other water oxidation catalysts...
July 19, 2017: ACS Applied Materials & Interfaces
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