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PubMed Journals Articles About "Plasmonic Switching Reaction Pathway Visible Light Irradiation Varies" RSS

21:32 EDT 24th June 2019 | BioPortfolio

Plasmonic Switching Reaction Pathway Visible Light Irradiation Varies PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Plasmonic Switching Reaction Pathway Visible Light Irradiation Varies articles that have been published worldwide.

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Showing "Plasmonic Switching Reaction Pathway Visible Light Irradiation Varies" PubMed Articles 1–25 of 20,000+

Plasmonic Switching of Reaction Pathway: Visible-Light Irradiation Varies Reactant Concentration at the Solid-Solution Interface of a Gold-Cobalt Catalyst.

Product selectivity of alkyne hydroamination over catalyst Au2Co alloy nanoparticles (NPs) can be made switchable by a light-on, light-off process, yielding imine (cross-coupling product of aniline and alkyne) under visible-light irradiation, but 1,4-diphenylbutadiyne in the dark. The low-flux light irradiation concentrates aniline on the catalyst, accelerating the catalytic cross-coupling by several orders even at a very low overall aniline concentration (1.0×10-3 mol/L). A tentative mechanism is that Au2...


Developing boron nitride-pyromellitic dianhydride composite for removal of aromatic pollutants from wastewater via adsorption and photodegradation.

A series of boron nitride-pyromellitic dianhydride composites have been successfully synthesized by calcinating the mixtures of boron nitride (BN) and pyromellitic dianhydride (PA) at 350 °C, in which the composite (BNPA2) has the largest adsorption quantity (65.1 mg/g) for rhodamine B (RhB) and the best photo-removal efficiency for RhB under visible light irradiation. H NMR characterizations for BN, PA and BNPA2 suggest that this composite is formed via the reaction between the OH groups in BN and PA....

Lewis acid activated CO reduction over a Ni modified Ni-Ge hydroxide driven by visible-infrared light.

Improvement of light harvesting and reaction kinetics is of great importance for achieving efficient solar-driven CO2 reduction. Here, a Ni modified low-crystalline Ni-Ge containing hydroxide with Lewis acid sites was synthesized in highly reductive NaBH4 solution and exhibited 9.3 μmol gcat.-1 h-1 CO and 3.5 μmol gcat.-1 h-1 CH4 generation rates under visible light irradiation, and even achieved a 3.8 μmol gcat.-1 h-1 CO evolution under infrared light irradiation. The wide-spectrum light harvesting resu...


Synthesis of β-Sulfonyl Amides through a Multicomponent Reaction with the Insertion of Sulfur Dioxide under Visible Light Irradiation.

A multicomponent reaction of styrenes, aryldiazonium tetrafluoroborates, sulfur dioxide, nitriles, and water in the presence of a photocatalyst at room temperature is performed. This vicinal aminosulfonylation of styrenes with the insertion of sulfur dioxide under visible light irradiation proceeds efficiently with excellent chemoselectivity, giving rise to the corresponding β-sulfonyl amides in moderate to good yields.

A single-crystalline silver plasmonic circuit for visible quantum emitters.

Plasmonic waveguides are key elements in nanophotonic devices serving as optical interconnects between nanoscale light sources and detectors. Multimode operation in plasmonic two-wire transmission lines promises important degrees of freedom for near-field manipulation and information encoding. However, highly confined plasmon propagation in gold nanostructures is typically limited to the near-infrared region due to ohmic losses, excluding all visible quantum emitters from plasmonic circuitry. Here, we repor...

Construction of a high-performance photocatalytic fuel cell (PFC) based on plasmonic silver modified Cr-BiOCl nanosheets for simultaneous electricity production and pollutant removal.

The development of high-performance photocatalytic fuel cells (PFCs) is seriously hampered by poor light utilization rates and low charge carrier transfer efficiency. Herein, we have experimentally obtained plasmonic Ag modified Cr-BiOCl (Cr-BOC/Ag) with high visible light photocatalytic activity and provided direct evidence for the substantially enhanced catalytic activity in metal-semiconductor photocatalysts. The experimental results revealed that the Cr doping and Ag modification could not only extend t...

Dynamic Plasmonic Pixels.

Information display utilizing plasmonic color generation has recently emerged as an alternative paradigm to traditional printing and display technologies. However, many implementations so far have either presented static pixels with a single display state or rely on relatively slow switching mechanisms such as chemical transformations or liquid crystal transitions. Here, we demonstrate spatial, spectral, and temporal control of light using dynamic plasmonic pixels that function through the electric field in...

Visible-Light-Driven Selective Alkenyl C-P Bond Cleavage of Allenylphosphine Oxides.

An efficient method for highly selective alkenyl C-P bond cleavage, enabled by organic dyes and visible-light irradiation, was developed. This novel protocol involves a highly regioselective radical pathway initiated by singlet oxygen, affording diverse alkynyl phosphinates with good-to-excellent yields. Mechanistic studies and density functional theory calculations suggested an intramolecular process involving phosphorus migration, instead of phosphorus radical formation, at the early stage of the reaction...

Non-natural Photoenzymatic Controlled Radical Polymerization Inspired by DNA Photolyase.

Inspired by DNA photolyase, a non-natural photoenzymatic catalysis of common flavoproteins is developed for controlled radical polymerization under irradiation of visible light. This photoenzymatic polymerization is highly efficient under mild conditions, applicable to various monomer families, suitable for both homogeneous and heterogeneous media, and can be externally modulated by switching light on-off. A unique combination of the natural enzymatic deoxygenation with the non-natural photoenzymatic proces...

3 + 2-Cycloaddition of 2 H-Azirines with Nitrosoarenes: Visible-Light-Promoted Synthesis of 2,5-Dihydro-1,2,4-oxadiazoles.

A formal [3 + 2]-cycloaddition reaction of 2 H-azirines with nitrosoarenes has been achieved under irradiation by visible light with the assistance of organic dye photoredox catalyst. This method utilizes nitrosoarenes as efficient radical acceptors and provides a green and powerful method for a series of biologically important 1,2,4-oxadiazole derivatives in moderate to good yields.

Photocatalytic removal of phenanthrene and algae by a novel Ca-AgPO composite under visible light: Reactivity and coexisting effect.

In this study, the feasibility of a novel Ca-AgPO composite with visible light irradiation for the phenanthrene (PHE) degradation and algae inactivation in artificial seawater was firstly investigated. The experimental findings revealed that AgPO phase was sucessfully formed on the Ca-based material, and the presence of Ca-based material could effectively keep AgPO particles stable. An excellent performance on PHE degradation or algae inactivation was observed from Ca-AgPO composite under visible light irra...

Visible light intensity dependent negative photochromism of a binaphthyl-bridged phenoxyl-imidazolyl radical complex.

We herein report a novel biphotochromic molecule composed of two fast negative photochromic phenoxyl-imidazolyl radical complex units showing incident light intensity dependence of the photochemical reaction. The electronic coupling between the two fast negative photochromic units gives a non-linear photoresponse; weak- and intense-visible light irradiation proceed the one-photon and two-photon photochemical reactions, respectively. The solution of the stepwise negative photochromic molecule changes to colo...

Fabrication of visible-light-active Bi/BiOI-BiO composite with enhanced photocatalytic activity.

Plasmonic Bi modified BiOI-BiO composite (Bi/BiOI-BiO) was prepared via in situ UV reduction method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) techniques were carried out to identify the formation of semimetal Bi. The results indicated that the dot-like bismuth particles were originated from the partial reduction of lattice Bi to Bi by accumulated conduction band electrons in BiOI-BiO. The as-prepared ternary composite exhibited enhanced visible-ligh...

Visible-light-responsive antibacterial activity of Au-incorporated TiO layers formed on Ti-(0-10)at%Au alloys by air oxidation.

Rutile TiO layers were formed on substrates of Ti-(0-10)at%Au alloys by a simple process of air oxidation, and their antibacterial activities were evaluated under visible-light irradiation (λ ≥ 400 nm). Au was introduced into the TiO layers on Ti-(1-10)at%Au alloys and existed as both metallic Au nanoparticles and dissolved Au ions. The TiO layers that formed on Ti-5at%Au and Ti-10at%Au alloys exhibited visible-light photocatalytic activity, i.e., degradation of stearic acid and antibacterial activity ag...

Efficient photocatalytic debromination of 2,2',4,4'-tetrabromodiphenyl ether by Ag-loaded CdS particles under visible light.

Highly active and visible light-driven Ag-loaded CdS photocatalysts were prepared via a hydrothermal synthesis and photodeposition method. The removal and debromination of 2,2',4,4'-tetrabromodiphenyl ether was achieved efficiently using this Ag-loaded CdS under visible light, with a removal efficiency of 100% and a debromination ratio of 44.3% being achieved within 30 min. Both the reaction solvent and the water content were found to have a strong influence on the removal efficiency and the debromination...

Highly efficient and stable p-LaFeO/n-ZnO heterojunction photocatalyst for phenol degradation under visible light irradiation.

A series of catalysts with p-LaFeO/n-ZnO heterostructure were designed and prepared by hydrothermal method. The structure, surface topographies, optical properties and interfacial interactions of these photocatalysts were analyzed by XRD, SEM, TEM, PL, Uv-vis DRS, XPS, COD, TOC etc., indicating that p-n heterojunction formed at the interface between p-LaFeO and n-ZnO, which enhanced the photocatalytic activity. Among them, the 20%-p-LaFeO/n-ZnO composite exhibits the best activity for the phenol degradation...

Reversible dielectric switching behavior of a 1D coordination polymer induced by photo and thermal irradiation.

Solvothermal reaction of Zn(NO3)2 with 2,9-bis-(2-pyridine-3-yl-vinyl)-[1,10]phenanthroline (3-bpep) and furan-2,5-dicarboxylic acid (2,5-H2FDC) afforded a one-dimensional (1D) coordination polymer {[Zn2(3-bpep)2(2,5-FDC)2]·1.5H2O}n (1), which undergoes regioselective photocycloaddition to yield another 1D coordination polymer {[Zn2(3-bpep)(trans,rctt-3-bpbpycb)0.5(2,5-FDC)2]·H2O}n (2) in a single-crystal-to-single-crystal manner under UV light irradiation. The reverse process from 2 to 1 can be achieved ...

Photocatalytic degradation of trihalomethanes and haloacetonitriles on graphitic carbon nitride under visible light irradiation.

Trihalomethanes (THMs) and haloacetonitriles (HANs), most common disinfection by-products in drinking water, pose adverse environmental impacts and potential risks to human health. There is a pressing need to develop innovative, economically feasible, and environmentally benign processes to control these persistent contaminants. In this paper, visible-light-responsive graphitic carbon nitride (g-CN) samples were synthesized to degrade the THMs and HANs and the photocatalytic degradation mechanism was explor...

Peroxymonosulfate improved photocatalytic degradation of atrazine by activated carbon/graphitic carbon nitride composite under visible light irradiation.

The photocatalytic degradation of atrazine by activated carbon/graphitic carbon nitride composites with peroxymonosulfate (PMS) was investigated under visible light irradiation. The photocatalysts were prepared at different activated carbon (AC) loaded percentages and characterized by XRD, FT-IR, BET surface area, SEM, UV-Vis absorbance, photocurrent response and EIS. Several parameters which might influence the degradation efficiency were studied including PMS concentration, solution pH, catalyst dosage, i...

Photocatalytic hydrogen production from water splitting with N-doped β-GaO and visible light.

Based on the first principles calculations, the feasibility of the photocatalytic hydrogen production from water splitting driven by N-doped β-GaO in the visible light is investigated. The formation energy and dynamics properties are used to examine the stability of the doped structures. The absolute positions of the band energy edges are obtained and compared to the redox potentials of the hydrogen production reaction. Moreover, we calculate the carrier lifetime and mobility for both electron and hole of ...

Surfactant modified ZnO-BiO nanocomposite for degradation of lambda- cyhalothrin pesticide in visible light: A study of reaction kinetics and intermediates.

Coupling of semiconductor photocatalyst attracted more attention in the area of heterogeneous photocatalytic process. Herein we developed a low-cost visible light responsive coupled ZnO-BiO semiconductor with a molar ratio of 1:4, 1:2, and 3:4 by facile one-step hydrothermal method using a surfactant. The influences of BiO content on coupled catalyst were investigated. The synthesized catalysts were characterized by X-Ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spec...

Photocatalysis Enables Visible Light Uncaging of Bioactive Molecules in Live Cells.

The photomanipulation of bioactive molecules provides unique advantages with the high temporal and spatial precision of light. Here we report the first visible light uncaging reaction by photocatalytic deboronative hydroxylation in live cells. Using the fluorescein and rhodamine derivatives as photocatalysts and ascorbates as reductants, transient hydrogen peroxides were generated from molecular oxygen to uncage phenol, alcohol and amine functional groups on bioactive molecules in bacteria and mammalian cel...

Plasmonically-powered hot carrier induced modulation of light emission in a two-dimensional GaAs semiconductor quantum well.

A hot-electron-enabled route to controlling light with dissipative loss compensation in semiconductor quantum light emitters has been realized for tunable quantum optoelectronic devices via a two-species plasmon system. The dual species nano-plasmonic system is achieved by combining UV-plasmonic gallium metal nanoparticles (GaNPs) with visible-plasmonic gold metal nanoparticles (AuNPs) on a near-infrared two-dimensional GaAs/AlGaAs quantum well emitter. It has been demonstrated that while hot carrier-powere...

Photocatalyst-Free Visible-Light Photoredox Dearomatization of Phenol Derivatives Containing Ketoximes: An Easy Access to Spiropyrrolines.

A novel and simple visible-light photoredox intramolecular dearomatization of phenol derivatives containing ketoximes leading to spiropyrrolines has been developed. The protocol uses readily available 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as the base and electron-donor, visible light as the light source, and the reaction was performed well at room temperature without need of a photocatalyst. Therefore, the present method should provide a useful strategy for synthesis of spiropyrrolines.

TiO/SnO-Au nanocomposite catalyzed photochromic reaction for colorimetric immunoassay of tumor marker.

A simple colorimetric immunoassay based on visible light excitation for detection of carcinoembryonic antigen (CEA) was developed. Firstly, visible light photocatalysts of TiO/SnO-Au ternary heterostructures were prepared by in situ reduction method, which were characterized using transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD) and UV-vis diffuse reflectance spectroscopy (DRS). Then, a novel sandwich-type colorimetric immunoassay for quantit...


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