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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• 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

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

• , 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

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

• -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

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

• 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

Addition of Zn during the phosphine-based synthesis of indium phospide quantum dots: doping and surface passivation

• Natalia E. Mordvinova,
• Alexander A. Vinokurov,
• Oleg I. Lebedev,
• Tatiana A. Kuznetsova and
• Sergey G. Dorofeev

Beilstein J. Nanotechnol. 2015, 6, 1237–1246, doi:10.3762/bjnano.6.127

• atoms are mainly located at the surface of the InP QDs. With increasing Mnom an increasing blue shift of the UV–vis absorption spectra and the PL spectra is observed. This fact also points out to a decreasing of the QDs size. The dependence of the peak position on Mnom is shown in Figure 6. One can

• nanocrystals solution dispersed in hexane was mixed with THF and a certain amount of myristic acid was added. The mixture was loaded into a perfluoroethylene vessel and a certain amount of etching mixture (HF in THF 1:10) was added under stirring. Characterization The UV–vis absorption spectra were measured at

• signal was determined as relation of Zn K line integral intensity to In K line integral intensity. Excitation spectra were measured at room temperature with LS-55 Perkin Elmer spectrometer in a 1 cm quartz cuvette in the range of 200–900 nm with 0.5 nm resolution. UV–vis absorption spectra of Zn-doped

Synthesis, characterization and in vitro effects of 7 nm alloyed silver–gold nanoparticles

• Simon Ristig,
• Svitlana Chernousova,
• Wolfgang Meyer-Zaika and
• Matthias Epple

Beilstein J. Nanotechnol. 2015, 6, 1212–1220, doi:10.3762/bjnano.6.124

• resonance peak shows one maximum due to the distribution of the metals throughout the whole particle. Core–shell nanoparticles or individual silver or gold nanoparticles show two distinct plasmon resonance peaks [21][36][37]. As it is depicted in Figure 3, the absorption spectra show only one narrow peak

• instrument (Thermo Fisher Scientific, Vantaa, Finland) at λ = 570 nm. The absorption spectra of the cells was normalized to that of control cells (incubated without nanoparticles), thereby giving the relative level of cell death. A live–dead viability/cytotoxicity assay (Calcein AM, ethidium homodimer III

Electrical characterization of single molecule and Langmuir–Blodgett monomolecular films of a pyridine-terminated oligo(phenylene-ethynylene) derivative

• Henrry M. Osorio,
• Santiago Martín,
• María Carmen López,
• Santiago Marqués-González,
• Simon J. Higgins,
• Richard J. Nichols,
• Paul J. Low and
• Pilar Cea

Beilstein J. Nanotechnol. 2015, 6, 1145–1157, doi:10.3762/bjnano.6.116

• CHCl3 is also shown. The broad absorption spectra and the red shift of the absorption edge indicate the presence of various two dimensional (2D) J-aggregates of 1 on the water surface [92][93]. J-aggregates, named after E. E. Jelley who first discovered them [94], are formed by molecules arranged in an

Charge carrier mobility and electronic properties of Al(Op)₃: impact of excimer formation

• Andrea Magri,
• Pascal Friederich,
• Bernhard Schäfer,
• Valeria Fattori,
• Xiangnan Sun,
• Timo Strunk,
• Velimir Meded,
• Luis E. Hueso,
• Wolfgang Wenzel and
• Mario Ruben

Beilstein J. Nanotechnol. 2015, 6, 1107–1115, doi:10.3762/bjnano.6.112

• was successfully evaporated onto quartz substrates and was clearly identified in the absorption spectra of both the solution and the thin film. A structured steady state fluorescence emission was detected in solution, whereas a broad, red-shifted emission was observed in the thin film. This indicates

• thermal evaporation onto a quartz substrate forming an 80 nm thin film and the photophysical properties were measured. The almost identical profiles of the absorption spectra in CH2Cl2 solution and in the thin film (see Figure 3) confirm that the complex was successfully grown onto the quartz substrate

• evaporation rate. The deposition rate was 0.5 nm∙s−1 with a final thickness of 80 nm. The solid state absorption spectra were recorded on a Perkin-Elmer Lamba 900 UV–vis–NIR spectrophotometer, the photoluminescence spectra of Alq3 and Al(Op)3 were acquired on a Spex Fluorolog 2. The photoluminescence quantum

Effects of swift heavy ion irradiation on structural, optical and photocatalytic properties of ZnO–CuO nanocomposites prepared by carbothermal evaporation method

• Sini Kuriakose,
• D. K. Avasthi and
• Satyabrata Mohapatra

Beilstein J. Nanotechnol. 2015, 6, 928–937, doi:10.3762/bjnano.6.96

• absorption spectra of the pristine and irradiated nanocomposites are shown in Figure 3a. It can be clearly seen that swift heavy ion irradiation leads to enhanced absorption of the nanocomposite in the visible region. The band gap of pristine nanocomposite and sample irradiated at fluences of 3 × 1012, 1

• optimize the photocatalytic activity of ZnO–CuO nanocomposites. Figure 6 and Figure 7 show the UV–visible absorption spectra of 3.7 μM MB and MO dyes with the pristine and ion-irradiated nanocomposite samples as photocatalysts upon irradiation with sun light for different periods of time. The

• images of (a) pristine sample, samples irradiated with 90 MeV Ni ions at a fluence of (b) 3 × 1013 and (c,d) 1 × 1014 ions/cm2. XRD patterns of pristine and irradiated ZnO–CuO nanocomposites. (a) UV–visible absorption spectra of pristine and irradiated ZnO–CuO nanocomposite samples and (b) Tauc plots for

Silica micro/nanospheres for theranostics: from bimodal MRI and fluorescent imaging probes to cancer therapy

• Shanka Walia and
• Amitabha Acharya

Beilstein J. Nanotechnol. 2015, 6, 546–558, doi:10.3762/bjnano.6.57

• ca. 575 and 625 nm. The corresponding absorption spectra showed a slight decrease in absorbance at 350 nm compared to free TRICT. The photoluminescence lifetime of TRICT attached magnetic NPs showed a temperature variation of ca. 20 ps/°C. This result suggested that water soluble hybrid nanocolloids

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

• °, 47.69° and 57.42° were assigned to the (111), (220) and (311) lattice plane spacings of cubic ZnS, (zinc blende, ICDD PDF 00-065-0309) with a lattice parameter of 5.4 Å and 157.46 Å3 cell volume. The absorption spectra of ZnS–PVA nanofluid samples are depicted in Figure 5. The absorption in the

• wavelength range of 310 to 320 nm varies for irradiated samples from 10 to 50 kGy doses. Consequently, a slight blue shift occurred compared to the absorption maximum (340 nm) of bulk ZnS [26]. Additionally, the result indicated an enhancement in the intensity of the absorption spectra for irradiated samples

• from 53 to 59 nm with increasing doses from 10 to 50 kGy. The ZnS NPs exhibit zinc blende structure with the crystal lattice parameter of 5.4 Å and a cell volume of 157.46 Å3. The electronic absorption spectra revealed two absorption peaks located at 310 and 260 nm due to the ZnS NPs and carbonyl

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

• –desorption isotherm of 0.5 wt % Pd/TiO2 and the inset is the pore size distribution. Core level XPS spectra of a) Ti 2p and b) Pd 3d of 0.5 wt % Pd/TiO2. UV–vis absorption spectra of a) TiO2, b) 3.0 wt % Pd/TiO2, c) 0.5 wt % Pd/TiO2 and d) 1.0 wt % Pd/TiO2. Photoluminescence spectra of a) TiO2, b) 0.5 wt

Green preparation and spectroscopic characterization of plasmonic silver nanoparticles using fruits as reducing agents

• Jes Ærøe Hyllested,
• Marta Espina Palanco,
• Nicolai Hagen,
• Klaus Bo Mogensen and
• Katrin Kneipp

Beilstein J. Nanotechnol. 2015, 6, 293–299, doi:10.3762/bjnano.6.27

• near-infrared-excited surface enhanced Raman scattering. In addition to the surface plasmon band, UV–visible absorption spectra show features in the UV range which indicates also the presence of small silver clusters, such as Ag42+. The increase of the plasmon absorption correlates with the decrease of

Release behaviour and toxicity evaluation of levodopa from carboxylated single-walled carbon nanotubes

• Julia M. Tan,
• Jhi Biau Foo,
• Sharida Fakurazi and
• Mohd Zobir Hussein

Beilstein J. Nanotechnol. 2015, 6, 243–253, doi:10.3762/bjnano.6.23

• absorption spectra of pure LD, supernatant residue and SWCNT–COOH. Suggested π–π interaction between LD molecules and carbon nanotubes in a (a) sandwich or (b) parallel-displaced interaction. Results of the CHNS elemental analysis of the SWCNT–COOH, LD and SWCNT–LD nanohybrid. Location and relative intensity