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Search for "light source" in Full Text gives 196 result(s) in Beilstein Journal of Nanotechnology.

On the pathway of cellular uptake: new insight into the interaction between the cell membrane and very small nanoparticles

  • Claudia Messerschmidt,
  • Daniel Hofmann,
  • Anja Kroeger,
  • Katharina Landfester,
  • Volker Mailänder and
  • Ingo Lieberwirth

Beilstein J. Nanotechnol. 2016, 7, 1296–1311, doi:10.3762/bjnano.7.121

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  • with 320 channels. A helium–neon laser JDS Uniphase with a single mode intensity of 25 mW operating at a laser wavelength of λ0 = 632.8 nm was used as light source. Details of the measurements and data evaluation procedure are described in the literature [47]. For light scattering experiments, sample
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Published 16 Sep 2016

An ellipsometric approach towards the description of inhomogeneous polymer-based Langmuir layers

  • Falko O. Rottke,
  • Burkhard Schulz,
  • Klaus Richau,
  • Karl Kratz and
  • Andreas Lendlein

Beilstein J. Nanotechnol. 2016, 7, 1156–1165, doi:10.3762/bjnano.7.107

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  • barriers are reopened to the starting position. Spectroscopic ellipsometry We performed variable angle spectroscopic ellipsometry (VASE) using a spectroscopic imaging ellipsometer (nanofilm_ep3, Accurion, Göttingen, Germany) with a Xe arc lamp as a light source. Within one VASE measurement, the angle of
  • and a CCD camera (768 × 572 pixel) were used to take all micrographs, with a resulting lateral resolution of ≈2 μm. Nulling-based thickness mapping The same ellipsometer as mentioned above was used for ellipsometric mapping. An AOI of 50° and a 658 nm laser as a light source were used. For the
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Published 08 Aug 2016

The hydraulic mechanism in the hind wing veins of Cybister japonicus Sharp (order: Coleoptera)

  • Jiyu Sun,
  • Wei Wu,
  • Mingze Ling,
  • Bharat Bhushan and
  • Jin Tong

Beilstein J. Nanotechnol. 2016, 7, 904–913, doi:10.3762/bjnano.7.82

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  • 43210-1142, USA State Key Laboratory of Automotive Dynamic Simulation, Jilin University, Changchun 130022, China 10.3762/bjnano.7.82 Abstract The diving beetles (Dytiscidae, Coleoptera) are families of water beetles. When they see light, they fly to the light source directly from the water. Their hind
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Published 23 Jun 2016

Understanding interferometry for micro-cantilever displacement detection

  • Alexander von Schmidsfeld,
  • Tobias Nörenberg,
  • Matthias Temmen and
  • Michael Reichling

Beilstein J. Nanotechnol. 2016, 7, 841–851, doi:10.3762/bjnano.7.76

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  • others, but a length of 125 μm, a width of 30 μm and a thickness of 4 μm. The optical setup shown in Figure 2 consist of a stabilized laser light source (type 48TA-1-42037, Schäfter + Kirchhoff GmbH, Hamburg, Germany) operated at a wavelength of λ = 782 nm with the output power being optimized for low
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Published 10 Jun 2016

Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds

  • Majid K. Abyaneh,
  • Pietro Parisse and
  • Loredana Casalis

Beilstein J. Nanotechnol. 2016, 7, 809–816, doi:10.3762/bjnano.7.72

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  • Majid K. Abyaneh Pietro Parisse Loredana Casalis Diamond Light Source Ltd., Harwell Science and Innovation Campus, OX11 0DE Didcot, Oxfordshire, UK Elettra – Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area Science Park, Basovizza, 34149, Trieste, Italy 10.3762/bjnano.7.72 Abstract Herein
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Published 06 Jun 2016

Selective photocatalytic reduction of CO2 to methanol in CuO-loaded NaTaO3 nanocubes in isopropanol

  • Tianyu Xiang,
  • Feng Xin,
  • Jingshuai Chen,
  • Yuwen Wang,
  • Xiaohong Yin and
  • Xiao Shao

Beilstein J. Nanotechnol. 2016, 7, 776–783, doi:10.3762/bjnano.7.69

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  • ). Light absorbance was measured with a Shimadzu UV-2550 spectrometer using BaSO4 as a reference in the wavelength region of 190–600 nm. Photocatalytic reaction The photocatalytic reduction of carbon dioxide was carried out in a transparent batch reactor with a slurry bed with cooling jacket. The light
  • source was a 250 W high-pressure mercury lamp with an irradiation peak at about 365 nm. The reaction temperature was controlled by a thermostatic water bath at 25 ± 3 °C. The reactor, in which 12 mg of catalyst was dispersed in 12 mL of isopropanol, was tightly sealed during the reaction. A magnetic
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Published 01 Jun 2016

Thermo-voltage measurements of atomic contacts at low temperature

  • Ayelet Ofarim,
  • Bastian Kopp,
  • Thomas Möller,
  • León Martin,
  • Johannes Boneberg,
  • Paul Leiderer and
  • Elke Scheer

Beilstein J. Nanotechnol. 2016, 7, 767–775, doi:10.3762/bjnano.7.68

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  • the laser focus on the sample could be adjusted by tilting the mirror. A light source illuminated and a CCD camera monitored the sample. The resulting optical image is shown in the lower left, where the white lines indicate the contour of the Au structure and the laser spot (green point) shows the
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Published 30 May 2016

Comparative kinematical analyses of Venus flytrap (Dionaea muscipula) snap traps

  • Simon Poppinga,
  • Tim Kampowski,
  • Amélie Metzger,
  • Olga Speck and
  • Thomas Speck

Beilstein J. Nanotechnol. 2016, 7, 664–674, doi:10.3762/bjnano.7.59

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  • -Planar T*2/100 mm ZF), a cold light source (techno light 270, Karl Storz GmbH & Co.KG, Tuttlingen) and by using the software Motion Studio x64 2.12.12.00 (IDT, USA). For filming the slow opening motions, the closed traps were recorded with a ColorView II camera (recording speed: 1 frame per 10 or per 15
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Published 04 May 2016

Large area scanning probe microscope in ultra-high vacuum demonstrated for electrostatic force measurements on high-voltage devices

  • Urs Gysin,
  • Thilo Glatzel,
  • Thomas Schmölzer,
  • Adolf Schöner,
  • Sergey Reshanov,
  • Holger Bartolf and
  • Ernst Meyer

Beilstein J. Nanotechnol. 2015, 6, 2485–2497, doi:10.3762/bjnano.6.258

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  • implemented. Additionally, the samples can be optically exited by an external light source (UV–vis) which is introduced by a separate light fibre. An in situ piezo-electric alignment stage allows to focus and position the light exactly below the cantilever tip apex. Therefore, the setup allows for the
  • appropriately align the system. Beam deflection detection of cantilever oscillations is an ideal technique to fulfill these demands [29]. The light source may be placed quite far away (typically some centimetres) from the cantilever allowing for a direct optical access and the beam of light can be focused onto
  • the free oscillating end of the cantilever. The reflected light is detected with a position sensitive diode (PSD, Hamamatsu S5980). In our case the light source is a super luminescent diode (Superlum SLD-371-HP1) with a spectral centre at 838 nm and a bandwidth of 55 nm, which is placed outside the
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Published 28 Dec 2015

Green and energy-efficient methods for the production of metallic nanoparticles

  • Mitra Naghdi,
  • Mehrdad Taheran,
  • Satinder K. Brar,
  • M. Verma,
  • R. Y. Surampalli and
  • J. R. Valero

Beilstein J. Nanotechnol. 2015, 6, 2354–2376, doi:10.3762/bjnano.6.243

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  • and Au NPs through a green photochemical process using UV light source (365 nm wavelength) for 40 min. In this process, alginate can serve as both reducing and stabilizing agent. The particles had spherical morphology and their sizes were less than 10 nm for both Ag and Au. Their sorption experiment
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Published 10 Dec 2015

Plasma fluorination of vertically aligned carbon nanotubes: functionalization and thermal stability

  • Claudia Struzzi,
  • Mattia Scardamaglia,
  • Axel Hemberg,
  • Luca Petaccia,
  • Jean-François Colomer,
  • Rony Snyders and
  • Carla Bittencourt

Beilstein J. Nanotechnol. 2015, 6, 2263–2271, doi:10.3762/bjnano.6.232

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  • surface during the measurements, a dual beam charge neutralization composed of an electron gun (≈1 eV) and an Ar ion gun (≤10 eV) was used. The valence band investigation was performed using an excitation photon energy of hν = 31 eV from a horizontally polarized (p-polarized) synchrotron light source at
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Published 01 Dec 2015

Light-powered, artificial molecular pumps: a minimalistic approach

  • Giulio Ragazzon,
  • Massimo Baroncini,
  • Serena Silvi,
  • Margherita Venturi and
  • Alberto Credi

Beilstein J. Nanotechnol. 2015, 6, 2096–2104, doi:10.3762/bjnano.6.214

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  • along a nonsymmetric molecular axle in a repetitive fashion using light as the sole energy source [22]. The system, which operates autonomously (that is, under continuous experimental conditions and without external intervention, as long as the light source is on) and does not generate byproducts, is
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Published 02 Nov 2015

Effect of SiNx diffusion barrier thickness on the structural properties and photocatalytic activity of TiO2 films obtained by sol–gel dip coating and reactive magnetron sputtering

  • Mohamed Nawfal Ghazzal,
  • Eric Aubry,
  • Nouari Chaoui and
  • Didier Robert

Beilstein J. Nanotechnol. 2015, 6, 2039–2045, doi:10.3762/bjnano.6.207

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  • 2 h as a pollutant model. The details of the procedure and the photoreactor used were reported elsewhere in detail [7]. The photoreactor was placed in a solar box (Atlas, Suntest CPS+) equipped with a Xe lamp as a light source (300 nm < λ < 800 nm) to simulate natural UV–vis radiation. An incident
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Published 16 Oct 2015

Superluminescence from an optically pumped molecular tunneling junction by injection of plasmon induced hot electrons

  • Kai Braun,
  • Xiao Wang,
  • Andreas M. Kern,
  • Hilmar Adler,
  • Heiko Peisert,
  • Thomas Chassé,
  • Dai Zhang and
  • Alfred J. Meixner

Beilstein J. Nanotechnol. 2015, 6, 1100–1106, doi:10.3762/bjnano.6.111

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  • superluminescent point light-source based on an optically pumped molecular junction (gold substrate/self-assembled molecular monolayer/gold tip) of a scanning tunneling microscope, operating at ambient conditions and providing almost three orders of magnitude higher electron-to-photon conversion efficiency than
  • illumination is consistent with the hot electron population above the Fermi level requiring less bias voltage. The system reflects many essential features of a superluminescent light emitting diode and is an important step towards an efficient and fast optical point-light source. Conclusion In summary, our
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Published 04 May 2015

Transformation of hydrogen titanate nanoribbons to TiO2 nanoribbons and the influence of the transformation strategies on the photocatalytic performance

  • Melita Rutar,
  • Nejc Rozman,
  • Matej Pregelj,
  • Carla Bittencourt,
  • Romana Cerc Korošec,
  • Andrijana Sever Škapin,
  • Aleš Mrzel,
  • Srečo D. Škapin and
  • Polona Umek

Beilstein J. Nanotechnol. 2015, 6, 831–844, doi:10.3762/bjnano.6.86

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  • concentration began to rise. The system was kept at a temperature of 25 ± 3 °C and a relative humidity of 22 ± 3%. The light source was a 300 W Xe lamp (Newport Oriel Instrument, USA). The lamp imitates the solar spectrum and emits both ultraviolet (UV) and visible light (vis). The radiance intensity on the
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Published 27 Mar 2015

Morphology control of zinc oxide films via polysaccharide-mediated, low temperature, chemical bath deposition

  • Florian Waltz,
  • Hans-Christoph Schwarz,
  • Andreas M. Schneider,
  • Stefanie Eiden and
  • Peter Behrens

Beilstein J. Nanotechnol. 2015, 6, 799–808, doi:10.3762/bjnano.6.83

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  • [19]. At room temperature and without light illumination, ZnO provides only very few charge carriers in the conduction band leading to a moderate electrical conductivity [49]. The conductivity of ZnO dramatically increases when it is exposed to a light source. Improved conductivity can also be
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Published 24 Mar 2015

Observation of a photoinduced, resonant tunneling effect in a carbon nanotube–silicon heterojunction

  • Carla Aramo,
  • Antonio Ambrosio,
  • Michelangelo Ambrosio,
  • Maurizio Boscardin,
  • Paola Castrucci,
  • Michele Crivellari,
  • Marco Cilmo,
  • Maurizio De Crescenzi,
  • Francesco De Nicola,
  • Emanuele Fiandrini,
  • Valentina Grossi,
  • Pasqualino Maddalena,
  • Maurizio Passacantando,
  • Sandro Santucci,
  • Manuela Scarselli and
  • Antonio Valentini

Beilstein J. Nanotechnol. 2015, 6, 704–710, doi:10.3762/bjnano.6.71

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  • heterojunction. (a) Photocurrent induced by a 730 nm continuous wave, low power light source at various illumination intensities. (b) Photocurrent linearity at a drain voltage 15 V and wavelength of 730 nm. (c) Photocurrent induced at different wavelengths. (d) Comparison between the device external quantum
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Published 10 Mar 2015

Simple approach for the fabrication of PEDOT-coated Si nanowires

  • Mingxuan Zhu,
  • Marielle Eyraud,
  • Judikael Le Rouzo,
  • Nadia Ait Ahmed,
  • Florence Boulc’h,
  • Claude Alfonso,
  • Philippe Knauth and
  • François Flory

Beilstein J. Nanotechnol. 2015, 6, 640–650, doi:10.3762/bjnano.6.65

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  • Illumination by a concentrated light source is necessary for PEDOT polymerization on SiNWs electrodes. Indeed, the comparison of the CV curves in Figure 7 for EDOT under ambient light (curve a) shows that the current density is almost zero, much lower than that after illumination (curve b). The reason is that
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Published 04 Mar 2015

Tm-doped TiO2 and Tm2Ti2O7 pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

  • Desiré M. De los Santos,
  • Javier Navas,
  • Teresa Aguilar,
  • Antonio Sánchez-Coronilla,
  • Concha Fernández-Lorenzo,
  • Rodrigo Alcántara,
  • Jose Carlos Piñero,
  • Ginesa Blanco and
  • Joaquín Martín-Calleja

Beilstein J. Nanotechnol. 2015, 6, 605–616, doi:10.3762/bjnano.6.62

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  • , USB4000+) with a UV–vis–NIR light source (Ocean Optics, DH-2000-BAL). Results and Discussion Inductively coupled plasma–atomic emission spectroscopy Table 1 shows the weight percentage values of Tm with respect to TiO2, obtained by ICP–AES and calculated as the arithmetic average of the values obtained
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Published 02 Mar 2015

Overview of nanoscale NEXAFS performed with soft X-ray microscopes

  • Peter Guttmann and
  • Carla Bittencourt

Beilstein J. Nanotechnol. 2015, 6, 595–604, doi:10.3762/bjnano.6.61

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  • give different information. In this review only methods for bulk sensitive NEXAFS spectroscopy using STXM and TXM in the soft X-ray range will be further discussed. The Stony Brook group at the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory built the first STXM having a zone
  • at the electron storage ring ACO in Orsay, France [34][35]. Figure 4 shows the set-up of a typical TXM at a bending magnet source. In similarity to a conventional light microscope the electron storage ring is used as the light source. The condenser zone plate collects the incoming X-rays and is used
  • region are in operation at many synchrotron light sources worldwide [41]. Here, we restrict ourselves to a short overview of the most used instruments by the scientific community: At the Advanced Light Source (ALS) in Berkeley, California, USA, two STXMs [42][43][44] are operated for polymer sciences [45
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Published 27 Feb 2015

Novel ZnO:Ag nanocomposites induce significant oxidative stress in human fibroblast malignant melanoma (Ht144) cells

  • Syeda Arooj,
  • Samina Nazir,
  • Akhtar Nadhman,
  • Nafees Ahmad,
  • Bakhtiar Muhammad,
  • Ishaq Ahmad,
  • Kehkashan Mazhar and
  • Rashda Abbasi

Beilstein J. Nanotechnol. 2015, 6, 570–582, doi:10.3762/bjnano.6.59

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  • in the light source used, the percentage of Ag content or the cellular model used. Sharma et al. [32] reported zinc oxide nanoparticles with different formulations (0.1, 0.2, 0.3 and 0.4%) of Ag (size range: 23–59 nm) for their antibacterial activity and Shah et al. [33] reported that ZnO nanorods
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Published 26 Feb 2015

A scanning probe microscope for magnetoresistive cantilevers utilizing a nested scanner design for large-area scans

  • Tobias Meier,
  • Alexander Förste,
  • Ali Tavassolizadeh,
  • Karsten Rott,
  • Dirk Meyners,
  • Roland Gröger,
  • Günter Reiss,
  • Eckhard Quandt,
  • Thomas Schimmel and
  • Hendrik Hölscher

Beilstein J. Nanotechnol. 2015, 6, 451–461, doi:10.3762/bjnano.6.46

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  • complete microscope to reach the camera. By using polarized light for illumination, a polarizing beamsplitter can be used to reflect all light from the light source of the illumination towards the sample. By passing a λ/4 plate, the polarization direction gets rotated by 45°. After being reflected on the
  • sample, the light passes the λ/4 plate again and the polarization is rotated again by 45°. The polarization of the reflected light is now rotated by 90° towards the incident light from the light source. Therefore, the beamsplitter is completely transparent for light reflected from the sample, which can
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Published 13 Feb 2015

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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  • evaluated by degrading the endocrine disrupting compound (EDC) amoxicillin (AMX) excited under an artificial visible light source. In the preliminary run, almost complete degradation (97.5%) was achieved in 5 h with 0.5 wt % Pd loading and the degradation followed pseudo-first-order kinetics. The
  • these methods the photodeposition is the simplest. Most of the photodeposition employs artificial UV light as the source of energy. However, the utilization of sunlight instead of an artificial UV light source could be a sustainable alternative. The natural light effectively reduces the noble metal onto
  • stirring by adding 1 g of the synthesized photocatalysts. A 500 W tungsten-halogen lamp was used as visible light source with a high pass UV light filter (FSQ-GG400, Newport Corp.). All experiments were carried out under identical conditions. The control experiment was carried out without photocatalyst to
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Published 11 Feb 2015

Influence of size, shape and core–shell interface on surface plasmon resonance in Ag and Ag@MgO nanoparticle films deposited on Si/SiOx

  • Sergio D’Addato,
  • Daniele Pinotti,
  • Maria Chiara Spadaro,
  • Guido Paolicelli,
  • Vincenzo Grillo,
  • Sergio Valeri,
  • Luca Pasquali,
  • Luca Bergamini and
  • Stefano Corni

Beilstein J. Nanotechnol. 2015, 6, 404–413, doi:10.3762/bjnano.6.40

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  • for these measurements was equipped with: an Ocean Optics DH-20000-BAL light source, emitting radiation with wavelength in a range between 200–1050 nm; polarisers; and an Ocean Optics HR4000CG-UV-NIR grating monochromator, equipped with CCD detectors. Simulations of the optical properties of the
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Published 09 Feb 2015

Low-cost plasmonic solar cells prepared by chemical spray pyrolysis

  • Erki Kärber,
  • Atanas Katerski,
  • Ilona Oja Acik,
  • Valdek Mikli,
  • Arvo Mere,
  • Ilmo Sildos and
  • Malle Krunks

Beilstein J. Nanotechnol. 2014, 5, 2398–2402, doi:10.3762/bjnano.5.249

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  • lamp is a light source which simulates the conventional AM1.5 spectrum for testing solar cells. The dispersed light from the Xe lamp (incident on the solar cell as monochromatic light) was optically chopped at 30 Hz. EQE is defined as the number of collected charge carriers per incident photon. The EQE
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Published 12 Dec 2014
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