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Search for "visible light irradiation" in Full Text gives 69 result(s) in Beilstein Journal of Nanotechnology.

Palladium nanoparticles anchored to anatase TiO2 for enhanced surface plasmon resonance-stimulated, visible-light-driven photocatalytic activity

  • Kah Hon Leong,
  • Hong Ye Chu,
  • Shaliza Ibrahim and
  • Pichiah Saravanan

Beilstein J. Nanotechnol. 2015, 6, 428–437, doi:10.3762/bjnano.6.43

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  • under artificial visible light irradiation. The obtained results showed an excellent efficiency achieved irrespective of the palladium loading with an initial concentration of 20mg/L of AMX. From the experiment, the degradation efficiency of AMX followed an order of 97.5% (0.5 wt % Pd/TiO2) > 83.4% (3.0
  • photocatalytic activity and stability under artificial visible light irradiation by almost completely degrading AMX after a short time. The absorption over the full visible region with high photoactivity and stability laid a pathway for future practical sustainable applications. Thus, the present study is a
  • % Pd/TiO2, c) 3.0 wt % Pd/TiO2 and d) 1.0 wt % Pd/TiO2. Photocatalytic degradation rates of AMX under visible light irradiation. Schematic diagram of electron transfer and degradation mechanism of AMX. Recycled photocatalytic degradation rates of AMX (0.5 wt % Pd/TiO2). The kinetics of AMX degradation
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Published 11 Feb 2015

Interaction of dermatologically relevant nanoparticles with skin cells and skin

  • Annika Vogt,
  • Fiorenza Rancan,
  • Sebastian Ahlberg,
  • Berouz Nazemi,
  • Chun Sik Choe,
  • Maxim E. Darvin,
  • Sabrina Hadam,
  • Ulrike Blume-Peytavi,
  • Kateryna Loza,
  • Jörg Diendorf,
  • Matthias Epple,
  • Christina Graf,
  • Eckart Rühl,
  • Martina C. Meinke and
  • Jürgen Lademann

Beilstein J. Nanotechnol. 2014, 5, 2363–2373, doi:10.3762/bjnano.5.245

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  • DNA damage and apoptosis were detected in human skin epidermal cells after exposure to nickel nanoparticles [42]. Phototoxicity of zinc oxide nanoparticles induced the generation of oxidative DNA damage during UVA and visible light irradiation in keratinocytes [43]. Oxidative stress and skin cell
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Published 08 Dec 2014

Inorganic Janus particles for biomedical applications

  • Isabel Schick,
  • Steffen Lorenz,
  • Dominik Gehrig,
  • Stefan Tenzer,
  • Wiebke Storck,
  • Karl Fischer,
  • Dennis Strand,
  • Frédéric Laquai and
  • Wolfgang Tremel

Beilstein J. Nanotechnol. 2014, 5, 2346–2362, doi:10.3762/bjnano.5.244

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  • -light irradiation [50]. b) Volume of hydrogen generated (VH2) under visible-light irradiation from a tungsten halogen lamp using Janus and core-shell Au50nm@TiO2 nanostructures, as well as amorphous TiO2 and bare gold particles [50]. c) Schematic illustration of plasmonic dye-sensitized solar cells
  • d) embedding of the final hybrid particle at the interface in a PS-PMMA blend. Reprinted with permission from [34]. Copyright 2013 Elsevier. a) Proposed photocatalytic process for efficient hydrogen generation using the Janus Au@TiO2 nanostructures, based on excitation of the LSPR under visible
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Published 05 Dec 2014

DFT study of binding and electron transfer from colorless aromatic pollutants to a TiO2 nanocluster: Application to photocatalytic degradation under visible light irradiation

  • Corneliu I. Oprea,
  • Petre Panait and
  • Mihai A. Gîrţu

Beilstein J. Nanotechnol. 2014, 5, 1016–1030, doi:10.3762/bjnano.5.115

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  • order to explain experimental results regarding the photocatalytic degradation of these pollutants under visible light irradiation. Based on our modeling, we are able to clarify why transparent pollutants can degrade under visible light in the presence of a catalyst that absorbs only in the UV, to
  • ; density functional theory; photocatalytic degradation; titanium dioxide; visible light irradiation; Introduction Titania, TiO2, has been widely used as photocatalyst for environmental applications [1][2][3][4][5][6], particularly for waste water purification. Due to its large band gap TiO2 absorbs only
  • UV radiation, a fact that limits the efficiency and keeps the costs of the photocatalytic degradation of environmental pollutants high. To be used under visible light irradiation, in the range of wavelengths where the solar spectrum has its maximum, the electronic band structure of the photocatalyst
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Published 11 Jul 2014

Functionalized nanostructures for enhanced photocatalytic performance under solar light

  • Liejin Guo,
  • Dengwei Jing,
  • Maochang Liu,
  • Yubin Chen,
  • Shaohua Shen,
  • Jinwen Shi and
  • Kai Zhang

Beilstein J. Nanotechnol. 2014, 5, 994–1004, doi:10.3762/bjnano.5.113

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  • Pt/TiO2 nanocrystal photocatalysts exhibited enhanced photocatalytic hydrogen production under visible light irradiation [18]. Lee et al. also reported that CdS and CdSe nanocrystals dispersed on the internal surface of mesoporous TiO2 films could lead to the promoted photocatalytic hydrogen
  • as Cr or/and Ti incorporation in MCM-41. Active visible light absorption sites could be generated in MCM-41 due to transitional metal doping. It was found that the highly dispersed Cr ions within MCM 41 could be easily excited by visible light irradiation due to the electron transfer from O2− to Cr6
  • } facets as the reactive surfaces can accelerate the redox reactions. Therefore, nanosheet-based AgSbO3 photocatalysts showed a 1.8 times higher initial O2 evolution rate than AgSbO3 photocatalysts without the hierarchical structure under visible-light irradiation. Besides facet control, microstructure
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Published 09 Jul 2014

Enhancement of photocatalytic H2 evolution of eosin Y-sensitized reduced graphene oxide through a simple photoreaction

  • Weiying Zhang,
  • Yuexiang Li,
  • Shaoqin Peng and
  • Xiang Cai

Beilstein J. Nanotechnol. 2014, 5, 801–811, doi:10.3762/bjnano.5.92

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  • -RGO24/Pt for hydrogen evolution rises up to 12.9% under visible light irradiation (λ ≥ 420 nm), and 23.4% under monochromatic light irradiation at 520 nm. Fluorescence spectra and transient absorption decay spectra of the EY-sensitized RGO confirm that the electron transfer ability of RGO increases with
  • under visible light irradiation. Eosin Y (EY), a xanthene dye, is a very good sensitizer [13][14][15][16][17][18]. EY has been used to sensitize various matrixes such as TiO2 [13], Na2Ti2O4(OH)2 nanotubes [14], g-C3N4 [15], and α-[AlSiW11(H2O)O39]5− [18], and the sensitized photocatalysts are
  • characterized by a high activity for H2 evolution under visible light irradiation. Recently, to improve the photocatalytic activity for hydrogen evolution in the visible light region, EY has been employed to sensitize RGO, and the sensitized photocatalyst displays an increased photoactivity for hydrogen
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Published 06 Jun 2014

Visible light photooxidative performance of a high-nuclearity molecular bismuth vanadium oxide cluster

  • Johannes Tucher and
  • Carsten Streb

Beilstein J. Nanotechnol. 2014, 5, 711–716, doi:10.3762/bjnano.5.83

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  • oxidant. Trapping experiments using ethanol as a hydroxyl radical scavenger show significantly decreased photocatalytic substrate oxidation in the presence of EtOH. Photocatalytic performance analyses using monochromatic visible light irradiation show that the quantum efficiency Φ for indigo
  • . In these screening reactions it was found that 1 performs as an effective visible-light driven photooxidant for the degradation of indigo, see Figure 2. Photooxidative activity of 1 In detail, it was found that dye degradation under visible light irradiation (here: λ = 430 nm) is significantly
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Published 26 May 2014

Nanostructure sensitization of transition metal oxides for visible-light photocatalysis

  • Hongjun Chen and
  • Lianzhou Wang

Beilstein J. Nanotechnol. 2014, 5, 696–710, doi:10.3762/bjnano.5.82

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  • -mediated solvothermal method for the fabrication of nanosized CdS-sensitized TiO2 nanocrystals [27]. The obtained photocatalysts exhibited a high efficiency for the decomposition of methylene blue under visible light irradiation, demonstrating the strong coupling and effective electron transfers between
  • nitric oxide in air under visible light irradiation [28]. The same configuration of CdS photosensitized TiO2 was also used for the photocatalytic oxidation of ethanol vapour [29] and for the production of hydrogen from aqueous H2S solution under visible light [30]. In addition to TiO2 nanocrystals, 1D
  • photogenerated electrons from CdS to TiO2 nanotubes, and exhibited a much enhanced photocurrent generation and photocatalytic efficiency under visible-light irradiation. Kamat et al. compared the performances of CdS photosensitized ordered arrays of tubular TiO2 architectures with a CdS photosensitized
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Published 23 May 2014

A visible-light-driven composite photocatalyst of TiO2 nanotube arrays and graphene quantum dots

  • Donald K. L. Chan,
  • Po Ling Cheung and
  • Jimmy C. Yu

Beilstein J. Nanotechnol. 2014, 5, 689–695, doi:10.3762/bjnano.5.81

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  • wavelengths from 400 to 600 nm is observed, indicating the visible light response of TNAs is enhanced by loading GQDs. The photocatalytic activities of the catalysts were evaluated by the degradation of MB under visible light irradiation. Figure 5 shows that pristine TNAs have a relatively low activity. The
  • improved photocatalytic performance of GQDs/TNAs over TNAs can be simply explained by the photosensitization of TNAs by GQDs [38]. Upon visible light irradiation, electron–hole pairs are generated by the GQDs. Typically, the conduction band level of GQDs is higher than that of TiO2 [36][42]. Thus, an
  • light irradiation. Photocurrent responses of (a) TNAs and (b) GQDs/TNAs under visible-light irradiation. The potential bias was 0.417 V. Reaction scheme for the loading of GQDs onto TNAs via covalent bonding. Supporting Information Supporting information features FTIR spectra, TGA profiles of the
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Published 22 May 2014

Effects of the preparation method on the structure and the visible-light photocatalytic activity of Ag2CrO4

  • Difa Xu,
  • Shaowen Cao,
  • Jinfeng Zhang,
  • Bei Cheng and
  • Jiaguo Yu

Beilstein J. Nanotechnol. 2014, 5, 658–666, doi:10.3762/bjnano.5.77

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  • activity of the prepared Ag2CrO4was highly dependent on the preparation methods. The sample prepared by microemulsion method exhibits the highest photocatalytic efficiency on the degradation of methylene blue (MB) under visible-light irradiation. The enhanced photocatalytic activity could be ascribed to
  • . The performance of the developed Ag2CrO4 is evaluated by the photocatalytic degradation of methylene blue under visible-light irradiation. The effect of the three preparation methods on the structure, optical properties and photocatalytic activity are investigated and discussed. Results and Discussion
  • electrostatic interaction. Therefore, the photocatalytic activity of the as-prepared Ag2CrO4 samples is evaluated through MB degradation under visible-light irradiation. Without any photocatalyst, no obvious MB degradation is observed under visible-light irradiation. For comparison, P25 (commercial TiO2
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Published 19 May 2014

High activity of Ag-doped Cd0.1Zn0.9S photocatalyst prepared by the hydrothermal method for hydrogen production under visible-light irradiation

  • Leny Yuliati,
  • Melody Kimi and
  • Mustaffa Shamsuddin

Beilstein J. Nanotechnol. 2014, 5, 587–595, doi:10.3762/bjnano.5.69

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  • activity of Cd0.1Zn0.9S was studied for the hydrogen production from water reduction under visible light irradiation. Results: Compared to the series prepared by the co-precipitation method, samples prepared by the hydrothermal method performed with a better photocatalytic activity. The sample with the
  • larger particles of Ag metal, similar to the samples prepared by hydrothermal method mentioned above. The photocatalytic performances of Cd0.1Zn0.9S and Ag(x)-doped Cd0.1Zn0.9S samples prepared by the hydrothermal method were examined for hydrogen production under visible-light irradiation as shown in
  • hydrothermal and co-precipitation methods, respectively. The Ag(0.01)-doped Cd0.1Zn0.9S prepared by the hydrothermal method showed the highest photocatalytic activity and stability under visible light irradiation with a hydrogen production rate of 3.91 mmol/h, which was 1.7 times higher than that of the
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Published 07 May 2014

Artificial sunlight and ultraviolet light induced photo-epoxidation of propylene over V-Ti/MCM-41 photocatalyst

  • Van-Huy Nguyen,
  • Shawn D. Lin,
  • Jeffrey Chi-Sheng Wu and
  • Hsunling Bai

Beilstein J. Nanotechnol. 2014, 5, 566–576, doi:10.3762/bjnano.5.67

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  • references by XANES and proposed structures of V-Ti/MCM-41 (inset). Time course of the photo-epoxidation of propylene with molecular oxygen under UV–visible light irradiation (without an AM1.5G filter; 18.5 mW·cm−2): (a) C3H6 consumption rate and PO formation rate, (b) Selectivity to products. Lines are
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Published 05 May 2014

Mesoporous cerium oxide nanospheres for the visible-light driven photocatalytic degradation of dyes

  • Subas K. Muduli,
  • Songling Wang,
  • Shi Chen,
  • Chin Fan Ng,
  • Cheng Hon Alfred Huan,
  • Tze Chien Sum and
  • Han Sen Soo

Beilstein J. Nanotechnol. 2014, 5, 517–523, doi:10.3762/bjnano.5.60

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  • , suggesting that the mechanism of photocatalytic activity under visible-light irradiation involves predominantly hydroxyl radicals as the active species. Keywords: cerium oxide; dye degradation; mesoporous; photocatalysis; visible light; Introduction The degradation of organic pollutants by affordable and
  • surface area of the sample is 93 m2 g−1 as calculated by the Brunauer–Emmett–Teller (BET) method. The average pore size determined by a Barrett–Joyner–Halenda (BJH) analysis is 3 nm, confirming the mesoporous nature of the cerium oxide sample. The photocatalytic behavior at visible-light irradiation of
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Published 24 Apr 2014

Dye-sensitized Pt@TiO2 core–shell nanostructures for the efficient photocatalytic generation of hydrogen

  • Jun Fang,
  • Lisha Yin,
  • Shaowen Cao,
  • Yusen Liao and
  • Can Xue

Beilstein J. Nanotechnol. 2014, 5, 360–364, doi:10.3762/bjnano.5.41

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  • hydrothermal method. The dye-sensitization of these Pt@TiO2 core–shell structures allows for a high photocatalytic activity for the generation of hydrogen from proton reduction under visible-light irradiation. When the dyes and TiO2 were co-excited through the combination of two irradiation beams with
  • -efficient photocatalytic generation of hydrogen under visible-light irradiation. In this rational design of the ternary structure, the TiO2 particle acts as a bridge that allows for the effective electron transfer pathway of excited ErB→TiO2→Pt. Importantly, we found that when the TiO2 bridges are excited
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Published 26 Mar 2014

Preparation of NiS/ZnIn2S4 as a superior photocatalyst for hydrogen evolution under visible light irradiation

  • Liang Wei,
  • Yongjuan Chen,
  • Jialin Zhao and
  • Zhaohui Li

Beilstein J. Nanotechnol. 2013, 4, 949–955, doi:10.3762/bjnano.4.107

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  • for hydrogen evolution under visible light irradiation was also investigated. It was found that the photocatalytic hydrogen evolution activity over hexagonal ZnIn2S4 can be significantly increased by loading NiS as a co-catalyst. The formation of a good junction between ZnIn2S4 and NiS via the two
  • and its application for photocatalytic hydrogen evolution under visible light irradiation. It was found that NiS can be an effective co-catalyst for photocatalytic hydrogen evolution over ZnIn2S4. The as-prepared NiS/ZnIn2S4 nanocomposites showed superior photocatalytic performance for hydrogen
  • evolution under visible light irradiation and the activity of NiS/ZnIn2S4 with optimized amount of NiS is even higher than that of Pt/ZnIn2S4. A possible enhancement mechanism based on the co-catalyst and the formed junction for the improved photocatalytic activity in the NiS/ZnIn2S4 system was also
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Published 23 Dec 2013

Challenges in realizing ultraflat materials surfaces

  • Takashi Yatsui,
  • Wataru Nomura,
  • Fabrice Stehlin,
  • Olivier Soppera,
  • Makoto Naruse and
  • Motoichi Ohtsu

Beilstein J. Nanotechnol. 2013, 4, 875–885, doi:10.3762/bjnano.4.99

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  • the dashed lines in (c) and (e), respectively. (i) Dependence of Ra on the sputtering time. Solid black squares denote results for conventional RF sputtering, and solid red circles, for RF sputtering under visible light irradiation. Dependence of the surface roughness on the etching time. AL is
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Published 11 Dec 2013

Photocatalytic antibacterial performance of TiO2 and Ag-doped TiO2 against S. aureus. P. aeruginosa and E. coli

  • Kiran Gupta,
  • R. P. Singh,
  • Ashutosh Pandey and
  • Anjana Pandey

Beilstein J. Nanotechnol. 2013, 4, 345–351, doi:10.3762/bjnano.4.40

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  • bacterial strains under visible-light irradiation. The TiO2 and Ag-doped TiO2 photocatalysts were synthesized by acid catalyzed sol–gel technique and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–vis spectroscopy and photoluminescence (PL). The XRD pattern revealed
  • silver ions improves the efficiency under visible-light irradiation. The antibacterial activity of silver-doped TiO2 nanoparticles is significantly high in comparison to TiO2 nanoparticles. The Ag-doped TiO2 showed more photocatalytic activity on Gram-negative bacteria because Gram-positive bacteria have
  • photocatalysis efficiency of TiO2 and Ag-doped TiO2 was tested by the percentage viability reduction of bacterial colonies under visible-light irradiation. The viability of P. aeruginosa was reduced to zero at 40 mg/30 mL culture of Ag-doped TiO2 (7%) while S. aureus and E. coli showed zero viability at 60 mg/30
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Published 06 Jun 2013

Current–voltage characteristics of single-molecule diarylethene junctions measured with adjustable gold electrodes in solution

  • Bernd M. Briechle,
  • Youngsang Kim,
  • Philipp Ehrenreich,
  • Artur Erbe,
  • Dmytro Sysoiev,
  • Thomas Huhn,
  • Ulrich Groth and
  • Elke Scheer

Beilstein J. Nanotechnol. 2012, 3, 798–808, doi:10.3762/bjnano.3.89

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  • under UV light irradiation forming a completely π-conjugated molecule, while the closed isomer opens the ring under visible light irradiation, restricting the π-conjugation in the side-arms. The optimum irradiation wavelengths for triggering the ring opening reaction vary slightly from species to
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Published 26 Nov 2012

Enhanced visible light photocatalysis through fast crystallization of zinc oxide nanorods

  • Sunandan Baruah,
  • Mohammad Abbas Mahmood,
  • Myo Tay Zar Myint,
  • Tanujjal Bora and
  • Joydeep Dutta

Beilstein J. Nanotechnol. 2010, 1, 14–20, doi:10.3762/bjnano.1.3

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  • a test contaminant methylene blue with visible light irradiation at 72 kilolux (klx) showed that ZnO nanorods are 12–24% more active than ZnO nanoparticulate films. This can be directly attributed to the increased effective surface area for adsorption of target contaminant molecules. Defects, in the
  • . Comparative results of photocatalytic degradation studies on methylene blue with visible light irradiation demonstrated that ZnO nanorods are 12–24% more active than nanoparticulate films. An enhancement of 8% in the photocatalytic activity of ZnO nanorods was achieved through engineered creation of oxygen
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Published 22 Nov 2010
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