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Search for "absorption spectra" in Full Text gives 273 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO2, TiO2 and Bi2O3 nanoparticles

  • Tomasz Tański,
  • Wiktor Matysiak and
  • Barbara Hajduk

Beilstein J. Nanotechnol. 2016, 7, 1141–1155, doi:10.3762/bjnano.7.106

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  • concentration by weight of the used reinforcing phase, which was as follows: 0%, 4%, 8% and 12% for each type of nanoparticles. The width of the band gap was determined on the basis of the absorption spectra of radiation (UV–vis) and ellipsometry methods. Spectroscopic ellipsometry has been used in order to
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Published 05 Aug 2016

Photocurrent generation in carbon nanotube/cubic-phase HfO2 nanoparticle hybrid nanocomposites

  • Protima Rauwel,
  • Augustinas Galeckas,
  • Martin Salumaa,
  • Frédérique Ducroquet and
  • Erwan Rauwel

Beilstein J. Nanotechnol. 2016, 7, 1075–1085, doi:10.3762/bjnano.7.101

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  • MWCNTs do not emit light but instead expose their discrete electronic structure in the absorption spectra. The hybrid material manifests characteristic absorption features with a gradual merger of the MWCNT π-plasmon resonance band with the intrinsic defect band and fundamental edge of HfO2. The
  • , the electrons can be optically excited via a series of valence-to-conduction band transitions, resulting in characteristic vHS peaks in absorption spectra. However, since holes are instantly filled with readily available electrons, no excitons are formed, and consequently, no photoluminescence (PL
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Published 26 Jul 2016

The influence of phthalocyanine aggregation in complexes with CdSe/ZnS quantum dots on the photophysical properties of the complexes

  • Irina V. Martynenko,
  • Anna O. Orlova,
  • Vladimir G. Maslov,
  • Anatoly V. Fedorov,
  • Kevin Berwick and
  • Alexander V. Baranov

Beilstein J. Nanotechnol. 2016, 7, 1018–1027, doi:10.3762/bjnano.7.94

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  • the concentration of donors bonded in complexes with acceptors. and are the concentrations of donors bound to acceptor monomers and aggregates, respectively. and are the concentrations of acceptor in monomeric and aggregated forms in complexes, respectively. Typically, the absorption spectra of
  • obtained with a value of the extinction ratio = 1.20. This is in good accordance with the extinction ratio = 1.15 ± 0.05 obtained from the absorption spectra. The relevant calculations of the extinction of PcSz molecules in aggregates are presented in the Supporting Information File 4. The most favorable
  • –vis absorption and PL detection UV–visible absorption spectra were recorded using a UV3600 (Shimadzu) spectrophotometer. Steady-state photoluminescence spectra were measured using a Cary Eclipse (Varian) spectrofluorometer. Time-resolved PL spectroscopy was performed using a time-correlated single
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Published 13 Jul 2016

Phenalenyl-based mononuclear dysprosium complexes

  • Yanhua Lan,
  • Andrea Magri,
  • Olaf Fuhr and
  • Mario Ruben

Beilstein J. Nanotechnol. 2016, 7, 995–1009, doi:10.3762/bjnano.7.92

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  • at room temperature the absorption spectra of the diluted DMSO solutions of complexes 1–4 and of the sublimed product 4’. For comparison, UV–vis spectra were recorded for the free HPLN ligand in parallel. The spectra of the three dysprosium compounds present a similar pattern, as illustrated in
  • bands can result from slight differences in the structures of the complexes. As a consequence of the few milligrams of material obtained by the sublimation process, we were unable to compare the extinction coefficients of the complexes. As observed previously in the absorption spectra, the ligand
  • without additional matrix compound other than the sample itself. The absorption spectra were acquired at room temperature for diluted (2.0 × 10−6 M) DMSO (spectrophotometric grade) solutions on a Cary 500 Scan UV–vis–NIR spectrophotometer using a 1 cm quartz cell. Emission spectra were recorded at room
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Published 08 Jul 2016

Optical absorption signature of a self-assembled dye monolayer on graphene

  • Tessnim Sghaier,
  • Sylvain Le Liepvre,
  • Céline Fiorini,
  • Ludovic Douillard and
  • Fabrice Charra

Beilstein J. Nanotechnol. 2016, 7, 862–868, doi:10.3762/bjnano.7.78

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  • combining two successive images with downward and upward slow-scan directions. Optical absorption spectra at normal incidence were obtained with a Perkin-Elmer Lambda 650 spectrometer. Optical microspectroscopy was adapted on an Olympus IX71 microscope equipped with an Ocean Optics spectrometer QE-Pro
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Published 14 Jun 2016

Hierarchical coassembly of DNA–triptycene hybrid molecular building blocks and zinc protoporphyrin IX

  • Rina Kumari,
  • Sumit Singh,
  • Mohan Monisha,
  • Sourav Bhowmick,
  • Anindya Roy,
  • Neeladri Das and
  • Prolay Das

Beilstein J. Nanotechnol. 2016, 7, 697–707, doi:10.3762/bjnano.7.62

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  • fluorescence (λem = 530 nm) and absorption spectra (λabs = 500 nm). We found that at a given concentration of DHR 123 and a fixed irradiation time, the composite DNA nanofibers that were constructed from assemblies of DNA–TPA triconjugates in the presence of Zn PpIX produced the maximum ROS as compared to a
  • absorption spectra and steady-state fluorescent spectra of rhodamine 123 quantifying the photocatalytic activity of nanofibers (S1 DNA–TPA/S2 DNA–TPA triconjugate Zn PpIX coassembly) and their control. Schematic representation of creation of nanostructures from DNA–TPA hybrid self-assembly. The number and
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Published 12 May 2016

Gold nanoparticles covalently assembled onto vesicle structures as possible biosensing platform

  • M. Fátima Barroso,
  • M. Alejandra Luna,
  • Juan S. Flores Tabares,
  • Cristina Delerue-Matos,
  • N. Mariano Correa,
  • Fernando Moyano and
  • Patricia G. Molina

Beilstein J. Nanotechnol. 2016, 7, 655–663, doi:10.3762/bjnano.7.58

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  • . Figure 2 shows the absorption spectra of the glycerol solutions of the metallic precursor and the AuNPs synthesized with different times of irradiation (λirridiation = 300 nm). Glycerol acts as solvent and as the reducing agent and the glycerol oxidation products are able to stabilize the AuNPs [26
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Published 02 May 2016

Bacteriorhodopsin–ZnO hybrid as a potential sensing element for low-temperature detection of ethanol vapour

  • Saurav Kumar,
  • Sudeshna Bagchi,
  • Senthil Prasad,
  • Anupma Sharma,
  • Ritesh Kumar,
  • Rishemjit Kaur,
  • Jagvir Singh and
  • Amol P. Bhondekar

Beilstein J. Nanotechnol. 2016, 7, 501–510, doi:10.3762/bjnano.7.44

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  • scanning electron microscope (SEM, Hitachi) with an accelerating voltage of 5–15 kV. The film thickness was measured using a surface profilometer in contact mode (Taly-surf PGI 120). Raman and optical spectral analysis The optical absorption spectra of all the nanostructures were recorded using a UV–vis
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Published 04 Apr 2016

Antibacterial activity of silver nanoparticles obtained by pulsed laser ablation in pure water and in chloride solution

  • Brunella Perito,
  • Emilia Giorgetti,
  • Paolo Marsili and
  • Maurizio Muniz-Miranda

Beilstein J. Nanotechnol. 2016, 7, 465–473, doi:10.3762/bjnano.7.40

Graphical Abstract
  • NP size. The UV–vis absorption spectra, instead, evidenced a larger content of oxidized silver on the surface of the ps-ablated nanoparticles. This results in the release of more silver ions, which is recognized to be quite important for the antimicrobial activity [15][16]. For the colloids obtained
  • counted as CFU/mL. The MBC was identified as the lowest concentration of the antibacterial agent that reduced the viability of the initial bacterial inoculum by ≥99.9%. UV–vis absorption spectra of AgNPs in colloidal suspensions obtained with (a) ps and (b) ns laser ablation. Typical TEM image and size
  • characterization AgNPs were prepared by PLAL. The experimental setup has been previously described by Giorgetti et al. [31], and the specific fabrication conditions are reported in the Experimental section. The list of samples with their characteristics is shown in Table 1. Figure 1 reports the UV–vis absorption
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Published 18 Mar 2016

Hemolysin coregulated protein 1 as a molecular gluing unit for the assembly of nanoparticle hybrid structures

  • Tuan Anh Pham,
  • Andreas Schreiber,
  • Elena V. Sturm (née Rosseeva),
  • Stefan Schiller and
  • Helmut Cölfen

Beilstein J. Nanotechnol. 2016, 7, 351–363, doi:10.3762/bjnano.7.32

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  • to collect the species in the mixture for TEM and HRTEM. Finally, the solution with a TEM grid was frozen in liquid nitrogen for 10 min in the magnetic field. The frozen sample was removed and lyophilized under 0.01 mbar vacuum over 2 days. Methods The absorption spectra were recorded on a UV–vis
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Published 04 Mar 2016

Influence of calcium on ceramide-1-phosphate monolayers

  • Joana S. L. Oliveira,
  • Gerald Brezesinski,
  • Alexandra Hill and
  • Arne Gericke

Beilstein J. Nanotechnol. 2016, 7, 236–245, doi:10.3762/bjnano.7.22

Graphical Abstract
  • constant at the desired value with an accuracy of ±0.1 °C. Infrared reflection–absorption spectroscopy (IRRAS) Infrared reflection–absorption spectra were recorded on a Vertex 70 FTIR spectrometer (Bruker, Ettlingen, Germany). The setup includes a MCT detector cooled with liquid nitrogen and coupled to a
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Published 12 Feb 2016

Single-molecule mechanics of protein-labelled DNA handles

  • Vivek S. Jadhav,
  • Dorothea Brüggemann,
  • Florian Wruck and
  • Martin Hegner

Beilstein J. Nanotechnol. 2016, 7, 138–148, doi:10.3762/bjnano.7.16

Graphical Abstract
  • absorption spectra. The mobility of the PDHs was expected to be less than that of the unlabelled DIG-biotin strands and was confirmed with band shifts in agarose gel electrophoresis tests (Figure 2). 1.8% (a) and 1% gel (b) images are shown next to each other, these shifts are more prominent in gel lanes 2
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Published 29 Jan 2016

Dependence of lattice strain relaxation, absorbance, and sheet resistance on thickness in textured ZnO@B transparent conductive oxide for thin-film solar cell applications

  • Kuang-Yang Kou,
  • Yu-En Huang,
  • Chien-Hsun Chen and
  • Shih-Wei Feng

Beilstein J. Nanotechnol. 2016, 7, 75–80, doi:10.3762/bjnano.7.9

Graphical Abstract
  • acquired by the use of a Gatan monoCL3 spectrometer in a JEOL JSM 7000F SEM system. The absorption spectra were acquired with a U-3900 spectrophotometer (model 2J2-0015) at room temperature. The Raman spectra were recorded in the backscattering configuration using a Jobin Yvon-Horiba micro-Raman system
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Published 20 Jan 2016

Controlled graphene oxide assembly on silver nanocube monolayers for SERS detection: dependence on nanocube packing procedure

  • Martina Banchelli,
  • Bruno Tiribilli,
  • Roberto Pini,
  • Luigi Dei,
  • Paolo Matteini and
  • Gabriella Caminati

Beilstein J. Nanotechnol. 2016, 7, 9–21, doi:10.3762/bjnano.7.2

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  • arrays by means of the Langmuir–Blodgett technique. (a) π–A and Cs−1–A isotherm for AgNCs at the water–air interface. Optical images (650 × 750 µm) of the LB film of AgNC transferred at different surface pressures along the isotherm. (b) Absorption spectra of AgNC dispersion (dotted line) of a 1 LB layer
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Published 06 Jan 2016

Sonochemical co-deposition of antibacterial nanoparticles and dyes on textiles

  • Ilana Perelshtein,
  • Anat Lipovsky,
  • Nina Perkas,
  • Tzanko Tzanov and
  • Aharon Gedanken

Beilstein J. Nanotechnol. 2016, 7, 1–8, doi:10.3762/bjnano.7.1

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  • measuring their absorption spectra. The results are presented in (Table 2 and Figure 8). When RO16 was sonochemically coated with metal oxide, the decrease in the intensity of color was smaller in comparison to the leaching observed for the sonochemically deposited dye alone. This might indicate a possible
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Published 04 Jan 2016

Chemiresistive/SERS dual sensor based on densely packed gold nanoparticles

  • Sanda Boca,
  • Cosmin Leordean,
  • Simion Astilean and
  • Cosmin Farcau

Beilstein J. Nanotechnol. 2015, 6, 2498–2503, doi:10.3762/bjnano.6.259

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  • biological molecules. Optical absorption spectra of the colloidal suspension recorded before and after incubation with folic acid confirmed the capping of AuNPs (redshift of the dipolar plasmon band) (Figure S1, Supporting Information File 1). DLS measurements correlate with the optical absorption results
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Published 29 Dec 2015

Self-organization of gold nanoparticles on silanated surfaces

  • Htet H. Kyaw,
  • Salim H. Al-Harthi,
  • Azzouz Sellai and
  • Joydeep Dutta

Beilstein J. Nanotechnol. 2015, 6, 2345–2353, doi:10.3762/bjnano.6.242

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  • driving force for migrating on the surface during annealing process leading to no specific reorganisation of AuNPs. Figure 8 shows ultraviolet–visible absorption spectra of AuNPs deposited on APTES-functionalized glass substrates (before and after annealing in air and vacuum). Surface plasmon resonance
  • ) the valence band maximum of same samples obtained by linear extrapolations. AFM images of Au NPs deposited on silanized glass substrates, (a) without annealing (as deposited) (b) annealed in vacuum (c) annealed in air at 600 °C for 1 h. UV–visible absorption spectra of AuNPs deposited on APTES
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Published 10 Dec 2015

Green synthesis, characterization and catalytic activity of natural bentonite-supported copper nanoparticles for the solvent-free synthesis of 1-substituted 1H-1,2,3,4-tetrazoles and reduction of 4-nitrophenol

  • Akbar Rostami-Vartooni,
  • Mohammad Alizadeh and
  • Mojtaba Bagherzadeh

Beilstein J. Nanotechnol. 2015, 6, 2300–2309, doi:10.3762/bjnano.6.236

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  • against number of catalytic cycles for the preparation 1-phenyl-1H-1,2,3,4-tetrazole with Cu NPs/bentonite for five successive cycles. Conditions: aniline (2 mmol), NaN3 (2 mmol), triethyl orthoformate (2.4 mmol), catalyst (0.05 g) at 120 °C, 3 h. UV–vis absorption spectra of 4-NP (a) and 4-NP + NaBH4 (b
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Published 03 Dec 2015

A single-source precursor route to anisotropic halogen-doped zinc oxide particles as a promising candidate for new transparent conducting oxide materials

  • Daniela Lehr,
  • Markus R. Wagner,
  • Johanna Flock,
  • Julian S. Reparaz,
  • Clivia M. Sotomayor Torres,
  • Alexander Klaiber,
  • Thomas Dekorsy and
  • Sebastian Polarz

Beilstein J. Nanotechnol. 2015, 6, 2161–2172, doi:10.3762/bjnano.6.222

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  • information about some electronic properties of semiconductor compounds. Absorption spectra were acquired in diffuse reflection mode (Rdiff) and are shown in Figure 4a for ZnO1−xClx samples. It can be seen that chlorine doping leads to a shift of the band gap energy, Egap, to higher energies, and there is a
  • HRTEM (scalebar 10 nm) of the ZnO1−xClx material. See also Figure S4 (Supporting Information File 1). (a) Absorption spectra in diffuse reflection modus, room temperature photoluminescence spectra; overview (b) and band gap region (c). (d) PL spectra recorded at T = 7 K. Hashes (blue): ZnO (Dcryst = 22
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Published 18 Nov 2015

Conformational switching of ethano-bridged Cu,H2-bis-porphyrin induced by aromatic amines

  • Simona Bettini,
  • Emanuela Maglie,
  • Rosanna Pagano,
  • Victor Borovkov,
  • Yoshihisa Inoue,
  • Ludovico Valli and
  • Gabriele Giancane

Beilstein J. Nanotechnol. 2015, 6, 2154–2160, doi:10.3762/bjnano.6.221

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  • variations in the absorption spectra, suggesting that the aromatic group of the analyte is crucial for the conformational switching in the bis-porphyrin derivative. Therefore, these results prompted us to test a phenol solution as a subphase for the Cu,H2-Por2 floating film. As highlighted by the invariant
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Published 17 Nov 2015

Nonlinear optical properties of near-infrared region Ag2S quantum dots pumped by nanosecond laser pulses

  • Li-wei Liu,
  • Si-yi Hu,
  • Yin-ping Dou,
  • Tian-hang Liu,
  • Jing-quan Lin and
  • Yue Wang

Beilstein J. Nanotechnol. 2015, 6, 1781–1787, doi:10.3762/bjnano.6.182

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  • QDs were determined using a JEOL JEM-100cx transmission electron microscope (TEM) with an accelerating voltage of 80 kV. The TEM image of Ag2S is shown in Figure 1a. The particles are estimated to have an average diameter of 5–6 nm. Figure 1a shows the absorption spectra of Ag2S QDs, measured by a
  • we may explore further the specific physical mechanisms and dynamics of nanoparticles with laser technology. (a) Absorption spectra of Ag2S QDs in chloroform, the TEM image of Ag2S QDs is shown in the inset. (b) EDS spectra of Ag2S QDs. Simulation model (a) and result (b). Experimental setup. (a
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Published 24 Aug 2015

A facile method for the preparation of bifunctional Mn:ZnS/ZnS/Fe3O4 magnetic and fluorescent nanocrystals

  • Houcine Labiadh,
  • Tahar Ben Chaabane,
  • Romain Sibille,
  • Lavinia Balan and
  • Raphaël Schneider

Beilstein J. Nanotechnol. 2015, 6, 1743–1751, doi:10.3762/bjnano.6.178

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  • by sonication and transferred to quartz cuvettes using a syringe. The absorption spectra were recorded on a Thermo Scientific, Evolution 220 UV–vis spectrophotometer. The photoluminescence spectra were recorded on a Horiba, Fluoromax-4, Jobin Yvon spectrofluorimeter. The QY values were determined
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Published 17 Aug 2015

Synthesis, characterization and in vitro biocompatibility study of Au/TMC/Fe3O4 nanocomposites as a promising, nontoxic system for biomedical applications

  • Hanieh Shirazi,
  • Maryam Daneshpour,
  • Soheila Kashanian and
  • Kobra Omidfar

Beilstein J. Nanotechnol. 2015, 6, 1677–1689, doi:10.3762/bjnano.6.170

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  • , from the TGA results, the amount of immobilized polymer on the nanoparticles was estimated. Due to the strong surface plasmon peak of the Au nanoparticles at about 520 nm, the presence of such nanoparticles could be confirmed in the visible spectra via UV–vis absorption spectra (Lambda 950 UV–vis
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Published 03 Aug 2015

In situ SU-8 silver nanocomposites

  • Søren V. Fischer,
  • Basil Uthuppu and
  • Mogens H. Jakobsen

Beilstein J. Nanotechnol. 2015, 6, 1661–1665, doi:10.3762/bjnano.6.168

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  • -exposure bake at 300 °C resulted in the formation of densely populated silver nanoparticles in the polymer matrix. They appeared to be single nanoparticles entities, smaller than the clusters that formed during the baking steps at 95 °C. This is evident from the UV–vis absorption spectra shown in Figure 3
  • acetonitrile results in a decreased film thickness compared to the unmodified SU-8. UV–vis absorption spectra of silver nanocomposites at silica wafers after post-exposure bake at 95 °C with varying AgNO3 precursor concentrations. The absorption increases with increasing amounts of AgNO3 precursor added. UV
  • –vis absorption spectra of a nanocomposite on a silica wafer containing 0.5 mL of 125 mg·mL−1 AgNO3 precursor solution after different post-exposure heat treatments. Blue dashed curve – after 95 °C for 10 min, red solid curve – after an additional 300 °C for 30 min and black dotted curve – AgNPs in
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Published 30 Jul 2015

Formation of substrate-based gold nanocage chains through dealloying with nitric acid

  • Ziren Yan,
  • Ying Wu and
  • Junwei Di

Beilstein J. Nanotechnol. 2015, 6, 1362–1368, doi:10.3762/bjnano.6.140

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  • using absorption spectroscopy. Figure 2A shows the UV–vis absorption spectra recorded from ITO-supported AgNPs after immersion in 0.1 mM HAuCl4 solution for various times. The spectra correspond to the excitation of dipolar and quadrupolar oscillations. The AgNPs exhibited typical LSPR peaks at 455 and
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Published 18 Jun 2015
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