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Search for "optical absorption" in Full Text gives 128 result(s) in Beilstein Journal of Nanotechnology.

Electronic interaction in composites of a conjugated polymer and carbon nanotubes: first-principles calculation and photophysical approaches

  • Florian Massuyeau,
  • Jany Wéry,
  • Jean-Luc Duvail,
  • Serge Lefrant,
  • Abu Yaya,
  • Chris Ewels and
  • Eric Faulques

Beilstein J. Nanotechnol. 2015, 6, 1138–1144, doi:10.3762/bjnano.6.115

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  • transfer between the polymer and the nanotubes is supported by examining steady-state PL energies of a series of composites films containing both metallic and SC nanotubes with x increasing from 0% to 64% compared to the optical absorption of SWNTs (Figure 5). We have substracted the absorption background
  • of SWNTs which is due to the π plasmons. In this way, only the contribution of SC and metallic tubes is clearly displayed. These experiments show that there is substantial spectral overlap of PL and optical absorption of SWNTs which could, in principle, favor the occurrence of Förster energy transfer
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Published 08 May 2015

Experimental determination of the light-trapping-induced absorption enhancement factor in DSSC photoanodes

  • Serena Gagliardi and
  • Mauro Falconieri

Beilstein J. Nanotechnol. 2015, 6, 886–892, doi:10.3762/bjnano.6.91

Graphical Abstract
  • , which therefore enhances the optical absorption. This approach describes a useful, functional characterization for the study of new morphologies of DSSC photoanodes. In fact, it can be applied both to simple structures and layered structures because it considers the photoanode as an effective layer and
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Published 02 Apr 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

Graphical Abstract
  • light [23], compared with the undoped TiO2. The optical absorption spectrum of TN-580 (Figure S7, see Supporting Information File 1) shows that the sample absorbs light up to 500 nm, whereas TO-580 and CH-W do not. A comparison of the diffuse reflectance spectra of the N-doped TiO2 (not shown) reveals
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Published 27 Mar 2015

Structural, optical, opto-thermal and thermal properties of ZnS–PVA nanofluids synthesized through a radiolytic approach

  • Alireza Kharazmi,
  • Nastaran Faraji,
  • Roslina Mat Hussin,
  • Elias Saion,
  • W. Mahmood Mat Yunus and
  • Kasra Behzad

Beilstein J. Nanotechnol. 2015, 6, 529–536, doi:10.3762/bjnano.6.55

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  • confirmed by powder X-ray diffraction in the 2θ range of 4 to 60° by using Philips X-ray diffractometer (7602 EA Almelo) with Cu Kα radiation (λ = 0.1542 nm). Optical absorption spectra were recorded by using a UV–vis spectrometer (Shimadzu-UV1650PC) in the wavelength range of 250 to 400 nm. The thermal
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Published 23 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

Graphical Abstract
  • NPs can be distinguished by two peaks centered at binding energies of 334.3 eV and 340.0 eV, which are assigned to Pd 3d5/2, and Pd 3d3/2, respectively (Figure 6b) [48] and confirm the predominantly metallic form of the deposited noble metal. Optical absorption and photoluminescence The optical
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Published 11 Feb 2015

Nanoporous Ge thin film production combining Ge sputtering and dopant implantation

  • Jacques Perrin Toinin,
  • Alain Portavoce,
  • Khalid Hoummada,
  • Michaël Texier,
  • Maxime Bertoglio,
  • Sandrine Bernardini,
  • Marco Abbarchi and
  • Lee Chow

Beilstein J. Nanotechnol. 2015, 6, 336–342, doi:10.3762/bjnano.6.32

Graphical Abstract
  • wavelengths (red–green). Si and Ge are indirect gap materials, requiring phonon scattering for optical absorption/emission to take place. However, Q-size effects present in porous semiconductors can promote optical transitions without the need of phonons by breaking the momentum conservation rules and/or by
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Published 30 Jan 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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  • depth. However, longer wavelengths penetrate deeper into the absorber (or are transmitted) and hence can fully utilize the presence the Au-NPs on the rear side of the absorber. In addition, Au is also an excellent reflector for wavelengths greater than 600 nm. Furthermore, an increase in the optical
  • absorption can be expected in the red/infrared region for the sprayed CIS/Au-NP composite layers, as previously shown [9][17]. The increase in the EQE is attributed to the increased CuInS2 coverage with Au-NPs when using a larger volume of the Au precursor solution [9]. The mean diameter of the individual
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Published 12 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

Graphical Abstract
  • to the optical transitions in amorphous TiO2 leading to enhanced optical absorption and, thus, generation of electron–hole pairs for photocatalysis (Figure 6a,b) [50]. Furthermore, plasmonic dye-sensitized solar cells based on Au@TiO2 nanostructures show remarkably enhanced power conversion
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Review
Published 05 Dec 2014

Hybrid spin-crossover nanostructures

  • Carlos M. Quintero,
  • Gautier Félix,
  • Iurii Suleimanov,
  • José Sánchez Costa,
  • Gábor Molnár,
  • Lionel Salmon,
  • William Nicolazzi and
  • Azzedine Bousseksou

Beilstein J. Nanotechnol. 2014, 5, 2230–2239, doi:10.3762/bjnano.5.232

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  • field around the metallic nanostructures can be successfully coupled to the molecular spin state changes brought on by the Fe centers of the SCO film. The LSPR technique was sensitive enough to detect the thermal spin transitions in thin films of up to 60 nm with a conventional optical absorption setup
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Published 25 Nov 2014

Silicon and germanium nanocrystals: properties and characterization

  • Ivana Capan,
  • Alexandra Carvalho and
  • José Coutinho

Beilstein J. Nanotechnol. 2014, 5, 1787–1794, doi:10.3762/bjnano.5.189

Graphical Abstract
  • surface groups was found to increase the electron binding energy of P, As and Sb, and to decrease the hole binding energy of B, Al, Ga and In [67]. Chlorine-covered Si NCs were found to have higher electron affinity, higher ionization energy and a lower optical absorption energy threshold than hydrogen
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Published 16 Oct 2014

Growth evolution and phase transition from chalcocite to digenite in nanocrystalline copper sulfide: Morphological, optical and electrical properties

  • Priscilla Vasthi Quintana-Ramirez,
  • Ma. Concepción Arenas-Arrocena,
  • José Santos-Cruz,
  • Marina Vega-González,
  • Omar Martínez-Alvarez,
  • Víctor Manuel Castaño-Meneses,
  • Laura Susana Acosta-Torres and
  • Javier de la Fuente-Hernández

Beilstein J. Nanotechnol. 2014, 5, 1542–1552, doi:10.3762/bjnano.5.166

Graphical Abstract
  • is clear, that the deficiencies of copper generate a displacement or shift of the optical absorption, which is consistent to the transition of the phases. The energy band gaps of the samples were computed by the Tauc plot for direct transition (Figure 5). The indirect plot (inset) did not present a
  • thin films from an aqueous solution [25][37]. On the other hand, the direct Eg values of the CuxS samples prepared in the organic solvent are in the range of 1.57–1.87 eV. These values are adequate for an optical absorption in the visible region, which makes the samples very promising materials for
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Published 15 Sep 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

Graphical Abstract
  • , Ph has strongest optical absorption but it is outperformed by SA likely due to a more efficient electron transfer. We have to state that our approach cannot quantify the four different criteria discussed. Although the comparison with the experimental data is only qualitative, the present approach can
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Published 11 Jul 2014

Biomolecule-assisted synthesis of carbon nitride and sulfur-doped carbon nitride heterojunction nanosheets: An efficient heterojunction photocatalyst for photoelectrochemical applications

  • Hua Bing Tao,
  • Hong Bin Yang,
  • Jiazang Chen,
  • Jianwei Miao and
  • Bin Liu

Beilstein J. Nanotechnol. 2014, 5, 770–777, doi:10.3762/bjnano.5.89

Graphical Abstract
  • intersects of the Mott–Schottky plots, the flatband potential and thus the conduction band edge of CN and CNS are estimated to be about −1.22 and −1.01 eV vs Ag/AgCl, respectively. Together with the bandgap energy obtained from optical absorption measurements, the valence band position for CN and CNS are
  • spectra of CN and CNS samples. (a) Optical absorption spectra of CN and CNS. Inset shows the Tauc plots for bandgap determination, (b) Mott–Schottky plots for CN and CNS. Schematic illustration of (a) electron–hole separation at the CN/CNS heterojunction interface, (b) the structure of CN/CNS
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Published 03 Jun 2014

Resonance of graphene nanoribbons doped with nitrogen and boron: a molecular dynamics study

  • Ye Wei,
  • Haifei Zhan,
  • Kang Xia,
  • Wendong Zhang,
  • Shengbo Sang and
  • Yuantong Gu

Beilstein J. Nanotechnol. 2014, 5, 717–725, doi:10.3762/bjnano.5.84

Graphical Abstract
  • been reported to have supreme stiffness (Young’s modulus ≈ 1 TPa), very high electron mobility, electrical and thermal conductivity, optical absorption as well as many other excellent properties [2][3]. These properties of graphene open up huge potential applications in the area of electronics
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Published 27 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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  • electrons oscillation on certain metallic nanostructures (e.g., Cu, Ag and Au). This radiation generates strong localized electromagnetic fields around the metallic nanostructures and leads to greatly enhanced optical absorption and scattering occurring at specific wavelengths, which depends not only on the
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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

Graphical Abstract
  • TNAs with GQDs not only extended the optical absorption spectrum of TNAs over the visible range, but also enhanced the photocatalytic and photoelectrochemical performances of TNAs under visible light. Results and Discussion Figure 1a shows a TEM image of GQDs with diameters of about 10 nm. The AFM
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Published 22 May 2014

Enhanced photocatalytic activity of Ag–ZnO hybrid plasmonic nanostructures prepared by a facile wet chemical method

  • Sini Kuriakose,
  • Vandana Choudhary,
  • Biswarup Satpati and
  • Satyabrata Mohapatra

Beilstein J. Nanotechnol. 2014, 5, 639–650, doi:10.3762/bjnano.5.75

Graphical Abstract
  • the background, with an energy slit of 8 eV for Zn, 30 eV for O and 2 eV for Ag. The observed EFTEM images confirmed the decoration of ZnO nanostructures with Ag nanoparticles. Optical absorption and photoluminescence The UV–visible absorption spectra of samples with varying Ag concentration are shown
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Published 15 May 2014

Photoactivation of luminescence in CdS nanocrystals

  • Valentyn Smyntyna,
  • Bogdan Semenenko,
  • Valentyna Skobeeva and
  • Nikolay Malushin

Beilstein J. Nanotechnol. 2014, 5, 355–359, doi:10.3762/bjnano.5.40

Graphical Abstract
  • nanocrystals used in these experiments were prepared by colloid chemistry of solutions of cadmium- and sulfursalts in an aqueous gelatin solution. Details of the sample preparation are described in [15]. The average radius of the cadmium sulfide nanocrystals was calculated from the optical absorption spectra
  • measured by a differential copper–constantan thermocouple. Results and Discussion The optical absorption spectrum of the investigated NC is shown in Figure 1. The long-wavelength absorption edge that corresponds to the first optical transition in CdS NC is shifted relative to the energy band gap of the
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Published 25 Mar 2014

Many-body effects in semiconducting single-wall silicon nanotubes

  • Wei Wei and
  • Timo Jacob

Beilstein J. Nanotechnol. 2014, 5, 19–25, doi:10.3762/bjnano.5.2

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  • SiNTs from 0.65, 0.28 and 0.05 eV at DFT level to 1.9, 1.22 and 0.79 eV at GW level. The Coulomb electron−hole (e−h) interactions significantly modify optical absorption properties obtained at noninteracting-particle level with the formation of bound excitons with considerable binding energies (of the
  • anodes for lithium rechargeable batteries [10][11][12]. Although the ground-state geometric and electronic properties of SiNTs have been studied [14][15][16][17], properties of excited states, for example optical absorption of SiNTs, are still in need. It is of high importance to correctly understand the
  • excitation and optical absorption properties. It is well-known that density functional theory (DFT) often fails in describing the properties of light absorption. This process requires a description of two-particle properties, which certainly goes beyond single-electron excitations that can be described at
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Published 06 Jan 2014

Synthesis of indium oxi-sulfide films by atomic layer deposition: The essential role of plasma enhancement

  • Cathy Bugot,
  • Nathanaëlle Schneider,
  • Daniel Lincot and
  • Frédérique Donsanti

Beilstein J. Nanotechnol. 2013, 4, 750–757, doi:10.3762/bjnano.4.85

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  • corresponds to the thickest film. In general it can be said that the thinner the films, the lower the FWHM. From these observations, it seems that we obtained In2S3 films only. Thin films optical absorption were determined from transmittance (T) and reflectance (R) measurements by using the following formula
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Published 13 Nov 2013

Modulation of defect-mediated energy transfer from ZnO nanoparticles for the photocatalytic degradation of bilirubin

  • Tanujjal Bora,
  • Karthik K. Lakshman,
  • Soumik Sarkar,
  • Abhinandan Makhal,
  • Samim Sardar,
  • Samir K. Pal and
  • Joydeep Dutta

Beilstein J. Nanotechnol. 2013, 4, 714–725, doi:10.3762/bjnano.4.81

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  • fluorescence spectroscopy, we have explored the influence of the surface defect-states (mainly the oxygen vacancies) of the various as-synthesized and annealed ZnO nanoparticles on the photocatalytic degradation process of BR. Results and Discussion Figure 1a shows the UV–vis optical absorption spectra of the
  • ) and presence (τDA) of the acceptor were initially determined. The efficiency E was then calculated using the following equation: (a) UV–vis optical absorption and (b) X-ray diffraction pattern of ZnO nanoparticles annealed at various temperatures in air for 1 h. The 60 °C sample indicates the non
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Published 04 Nov 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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  • nanoparticles to visible light was increased and showed red shift (towards increased wavelength). The red shift of the absorption curve results in a reduction of the band gap energy and also the recombination rate, and hence, enhanced photocatalytic activity. The optical absorption coefficient α of a
  • -doped TiO2 with a 3% concentration of silver salt (Figure 2b), whereas they are scattered in the case of Ag-doped TiO2 nanoparticles with a 7% concentration (Figure 2c) of silver salt. UV–vis spectroscopy Optical properties were observed by UV–vis spectroscopy. Figure 3 demonstrates the optical
  • absorption spectra of TiO2 and Ag/TiO2 (3% and 7%) nanoparticles. The absorption edge of TiO2 nanoparticles at 385 nm moved to a longer wavelength after doping with Ag ions (3% and 7%), showing the absorption edge at 435 nm and 450 nm, respectively. After doping with silver ions the response of TiO2
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Published 06 Jun 2013

Paper modified with ZnO nanorods – antimicrobial studies

  • Mayuree Jaisai,
  • Sunandan Baruah and
  • Joydeep Dutta

Beilstein J. Nanotechnol. 2012, 3, 684–691, doi:10.3762/bjnano.3.78

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  • offer large surface-to-volume ratios. Hydrothermally grown ZnO nanorods possess inherent defects in the form of oxygen vacancies and zinc interstitials, which shift its optical absorption from the ultraviolet to the visible region [20]. We previously reported the visible-light photocatalytic degradation
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Published 11 Oct 2012

Effect of deposition temperature on the structural and optical properties of chemically prepared nanocrystalline lead selenide thin films

  • Anayara Begum,
  • Amir Hussain and
  • Atowar Rahman

Beilstein J. Nanotechnol. 2012, 3, 438–443, doi:10.3762/bjnano.3.50

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  • diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and optical absorption studies. The structural parameters, such as the lattice constant (a), crystallite size (D), dislocation density (ρ) and microstrain (ε) were evaluated from the XRD spectra. It was found that average
  • crystallite size. The optical absorption spectra of the nanocrystalline PbSe films showed a blue shift, and the optical band gap (Eg) was found to increase from 1.96 to 2.10 eV with the decrease in crystallite size. Keywords: chemical bath deposition; lattice parameter; lead selenide; Nelson–Riley plot
  • ; optical absorption; Introduction Lead selenide (PbSe) with its narrow band gap (Eg = 0.27 eV) [1] is an important semiconductor of the IV–VI lead chalcogenides group. PbSe has a large exciton Bohr radius (46 nm), which offers the opportunity to achieve strong size quantization at relatively large crystal
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Published 06 Jun 2012

Highly efficient ZnO/Au Schottky barrier dye-sensitized solar cells: Role of gold nanoparticles on the charge-transfer process

  • Tanujjal Bora,
  • Htet H. Kyaw,
  • Soumik Sarkar,
  • Samir K. Pal and
  • Joydeep Dutta

Beilstein J. Nanotechnol. 2011, 2, 681–690, doi:10.3762/bjnano.2.73

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  • nanorods. The optical absorptions of the ZnO-nanorod and ZnO/Au-nanocomposite photoelectrode are shown in Figure 2a. Due to the absorption by surface plasmons in the Au nanoparticles, a higher optical absorption of the ZnO/Au-nanocomposite photoelectrode near 520 nm was observed. The optical absorption by
  • higher Jsc (82.46 μA/cm2) as well as Voc (0.39 V) compared to the bare ZnO-nanorod solar cell, which is mainly attributed to the higher optical absorption of the ZnO/Au photoelectrode due to the absorption by surface plasmons in Au nanoparticles. In the case of the ZnO/Au solar cells without any
  • successfully fabricated and their performances were compared with the bare ZnO-nanorod DSSC and discussed. Incorporation of Au nanoparticles into the ZnO-nanorod photoelectrode led to higher optical absorption by the photoelectrode and high dye intake, resulting in an ~35% enhancement in the photocurrent in
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Published 13 Oct 2011
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