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

• solution, creating a final mixture with a PcSz concentration in the range from 1 × 10−8 to 5 × 10−6 mol/L. All measurements were performed within two hours after preparation of the solution. UV–vis absorption and PL spectra of samples were measured for the mixture solutions after every addition step. UV

• absorption is negligible. This approach allows us to easily evaluate the efficiency of energy transfer in the mixture solution and the change in the PL QY of phthalocyanine bound to QDs. (a) UV–vis absorption (solid lines) and normalized PL spectra (dotted lines) of DMAET capped CdSe/ZnS quantum dots and

• –vis absorption and PL spectra of free CdSe/ZnS quantum dots and PcSz molecules are presented in Figure 1a. As seen in Figure 1a, a high spectral overlap between QD PL and PcSz absorption allows FRET conditions to be satisfied. In aqueous solution, the sulfo groups PcSz dissociate at a neutral pH and

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

• nanofibers (S1 DNA–TPA/S2 DNA–TPA triconjugate Zn PpIX coassembly) from self-assembly of DNA–TPA triconjugates from absorbance of DNA in solution at 260 nm. CD spectra showing the chirality and conformation of nanofiber (S1 DNA–TPA/S2 DNA–TPA triconjugate Zn PpIX coassembly) and their controls. UV–vis

• 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

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

• 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

• reasonable to expect more silver oxide in ps-ablated material. Moreover, the presence of a larger content of silver oxide on the surface of ps-ablated nanoparticles with respect to those ns-ablated was previously ascertained by means of UV–vis absorption experiments and theoretical modelling for Ag colloids

• 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

Rigid multipodal platforms for metal surfaces

• Michal Valášek,
• Marcin Lindner and
• Marcel Mayor

Beilstein J. Nanotechnol. 2016, 7, 374–405, doi:10.3762/bjnano.7.34

Characterisation of thin films of graphene–surfactant composites produced through a novel semi-automated method

• Nik J. Walch,
• Alexei Nabok,
• Frank Davis and
• Séamus P. J. Higson

Beilstein J. Nanotechnol. 2016, 7, 209–219, doi:10.3762/bjnano.7.19

• LbL deposition of graphene(−)SDS alternated with polyethyleneimine (PEI). The optical study of graphene thin films deposited on different substrates was carried out using UV–vis absorption spectroscopy and spectroscopic ellipsometry. A particular focus was on studying graphene layers deposited on gold

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

• ]. Results and Discussion Protein labelling of dsDNA Labelling of protein to DIG-DNA-Bio (4056, 3034 and 1000 bp) was carried out as discussed in the Experimental section. The labelled and unlabelled PDHs were analysed using electrophoresis in a 1.8% (for 1000 bp) and 1% (for 4056 bp) agarose gel and UV–vis

• 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

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

• yellow solution became colorless. 1.0 mL of the solution was extracted and diluted to 25 mL for further UV–vis absorption analysis at certain intervals. The concentration of 4-NP was determined spectrophotometrically at a wavelength of 400 nm. Results and Discussion Preparation and characterization of Cu

• 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

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

• molecular axle 1H+ (Figure 4) was thus synthesized, and the photoinduced transit of the dibenzo-24-crown-8 ether 2 was investigated in acetonitrile at room temperature by steady state and time-resolved 1H NMR spectroscopy and UV–vis absorption experiments [32]. The kinetic measurements demonstrated that the

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

• conducted for all Mn:ZnS/ZnS/Fe3O4 materials prepared. Figure 4b illustrates the sensitive magnetic response of the Mn:ZnS/ZnS/Fe3O4 (2) sample. PL properties of Mn:ZnS/ZnS/Fe3O4 QDs The optical properties of Mn:ZnS/ZnS/Fe3O4 samples were studied by UV–vis absorption spectroscopy and PL spectroscopy (Figure

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

• , the final Au nanoparticles with a desirable diameter of 10 ± 2 nm (Figure 2a,b) and negative surface charge were obtained. The UV–vis absorption spectrum of a ruby-red colloidal solution of Au nanoparticles is presented in Figure 2c. Due to the excitation of surface plasmon vibrations, a strong peak

• , 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

• /Fe3O4. (d) Iron oxide suspensions with (right) and without (left) an external magnetic field. (a) TEM image of Au nanoparticles along with (b) their corresponding particle size distribution. (c) UV–vis absorption spectrum of synthesized Au nanoparticles. (d) Image of a freshly prepared, ruby-red

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

• beginning plateaus of UV–vis absorption, luminescence peak position and QY. So we can observe that the optical properties are closely related to the amount of Zn in the sample and that there is a maximum amount of Zn that can be introduced into the QDs. It should be noted that the highest amount of Zn in

• 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

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

• BAM images. Figure 4 shows the normalized reflection spectra, ΔRnorm, of the Langmuir films of 1 (ΔRnorm = ΔR·A, where ΔR is the reflection and A is the area per molecule) for different values of the area per molecule. For comparison purposes, the UV–vis absorption spectrum of 1 (2.5 × 10−5 M) in

• mol·cm−2. This value is in excellent agreement with the estimated value determined from the molecular area of 1, which is 1.01 × 10−9 mol·cm−2 at a surface pressure of 16 mN·m−1. The UV–vis absorption spectrum of the LB film of 1 transferred onto quartz substrates at 16 mN·m−1 during the upstroke of the

From lithium to sodium: cell chemistry of room temperature sodium–air and sodium–sulfur batteries

• Philipp Adelhelm,
• Pascal Hartmann,
• Conrad L. Bender,
• Martin Busche,
• Christine Eufinger and
• Juergen Janek

Beilstein J. Nanotechnol. 2015, 6, 1016–1055, doi:10.3762/bjnano.6.105

Electromagnetic enhancement of ordered silver nanorod arrays evaluated by discrete dipole approximation

• Guoke Wei,
• Jinliang Wang and
• Yu Chen

Beilstein J. Nanotechnol. 2015, 6, 686–696, doi:10.3762/bjnano.6.69

• the SERS polarization was different from that of the polarized UV–vis absorbance of a nonplanar AgNR array substrate [36]. Practically, the UV–vis absorption spectrum measured in the experiment is the sum of absorption and scattering, i.e., extinction. So, the experimental observation is in line with

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

• inside the silica spheres by using CTAB as template surfactant. Finally complexes of lanthanides, namely Eu3+, Tb3+ with nicotinic and isonicotinic acid were introduce inside silica. The characterization of these multifunctional nanostructures was achieved by UV–vis absorption spectroscopy, XRD

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

• relatively simple way by using extracts of oranges and pineapples as reducing agents. Size and shape of the particles depend mainly on the kind of fruit used in the chemical preparation process. The UV–vis absorption spectrum displays the surface plasmon resonance and also features in the UV, which can be

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

• PC12 cell lines after 24, 48 and 72 h of treatment with LD, SWCNT–COOH and SWCNT–LD nanohybrid, at different concentrations. The optical density (OD) is directly correlated to the number of living cells. The data are shown as means ± standard deviation from three individual experiments. UV–vis

• 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

The distribution and degradation of radiolabeled superparamagnetic iron oxide nanoparticles and quantum dots in mice

• Denise Bargheer,
• Artur Giemsa,
• Barbara Freund,
• Markus Heine,
• Christian Waurisch,
• Gordon M. Stachowski,
• Stephen G. Hickey,
• Alexander Eychmüller,
• Jörg Heeren and
• Peter Nielsen

Beilstein J. Nanotechnol. 2015, 6, 111–123, doi:10.3762/bjnano.6.11

• to the excitonic peak in the UV–vis absorption spectrum, the size-dependent molar extinction coefficient for the CdSe core was determined using the following empirical formula [45]: D = (1.6122∙10−9)λ4 − (2.6575∙10−6)λ3 + (1. 6242∙10−3)λ2 − (0.4277)λ + 41.57. Radioactive labeling SPIOs and Qdots The

Liquid-phase exfoliated graphene: functionalization, characterization, and applications

• Mildred Quintana,
• Jesús Iván Tapia and
• Maurizio Prato

Beilstein J. Nanotechnol. 2014, 5, 2328–2338, doi:10.3762/bjnano.5.242

• solvents. After the ultrasonication process, graphene dispersions are typically centrifuged in order to eliminate graphite microcrystals. From the obtained, stable dispersions, it is possible to calculate the concentration of the graphene layers by UV–vis absorption, as shown in Figure 1 [21]. This

Nanobioarchitectures based on chlorophyll photopigment, artificial lipid bilayers and carbon nanotubes

• Marcela Elisabeta Barbinta-Patrascu,
• Stefan Marian Iordache,
• Ana Maria Iordache,
• Nicoleta Badea and
• Camelia Ungureanu

Beilstein J. Nanotechnol. 2014, 5, 2316–2325, doi:10.3762/bjnano.5.240

• structures with single-walled carbon nanotubes. Different biophysical methods were employed to characterize these biohybrids such as: UV–vis absorption and emission spectroscopy, zeta potential measurements, AFM and chemiluminescence techniques. The designed, carbon-based biohybrids exhibited good physical

Localized surface plasmon resonances in nanostructures to enhance nonlinear vibrational spectroscopies: towards an astonishing molecular sensitivity

• Dan Lis and
• Francesca Cecchet

Beilstein J. Nanotechnol. 2014, 5, 2275–2292, doi:10.3762/bjnano.5.237

• using spherical gold nanovoids with intermediate depths (see Figure 10a) [89]. Figure 10b presents a mapping of the UV–vis absorption spectrum of the void structure as a function of the thickness (for a diameter of 800 nm). An evolution of the plasmonic resonance was observed with the degree of

Nano-rings with a handle – Synthesis of substituted cycloparaphenylenes

• Anne-Florence Tran-Van and
• Hermann A. Wegner

Beilstein J. Nanotechnol. 2014, 5, 1320–1333, doi:10.3762/bjnano.5.145

• macrocyclic dimer 24 in 17% yield. Aromatization of this CPP precursor was achieved by sodium bisulfate in 1,2,4-trichlorobenzene to give the desired [12,2]CPPyr 25. Notably, the resulting pyrene product was soluble only in chlorinated solvents in contrast to the generally easily soluble CPPs. The UV–vis

• absorption spectrum can be explained by a combination of the spectra of pyrene and [16]CPP, as a result of the poor conjugation between paraphenylene and 2,7-pyrenylene. The emission maximum appears at 430 nm similar to [12]–[18]CPPs. However, the quantum yield is found to be much smaller with 0.21 in