Preparation and characterization of polycarbonate/multiwalled carbon nanotube nanocomposites

• Claudio Larosa,
• Niranjan Patra,
• Marco Salerno,
• Lara Mikac,
• Remo Merijs Meri and
• Mile Ivanda

Beilstein J. Nanotechnol. 2017, 8, 2026–2031, doi:10.3762/bjnano.8.203

• presence of submicrometer-scale filler particles throughout the polymer matrix is also observed even at the highest MWCNT loading (see Figure 1d). UV–vis absorption spectra of the PC/MWCNT composite films are presented in Figure 2. Good dispersion is crucial for optimal optical properties and ensures

• solvent helps to overcome the van der Waals interaction in the nanotubes, eventually leading to better dispersion. Figure 3 shows the normalized FTIR absorption spectra of principal absorbance bands of the investigated PC/MWCNT nanocomposite films. FTIR spectroscopy demonstrated to be a useful tool to

Fabrication of carbon nanospheres by the pyrolysis of polyacrylonitrile–poly(methyl methacrylate) core–shell composite nanoparticles

• Dafu Wei,
• Youwei Zhang and
• Jinping Fu

Beilstein J. Nanotechnol. 2017, 8, 1897–1908, doi:10.3762/bjnano.8.190

• (BJH) method. UV–vis absorption spectra were performed on a Perkin Elmer Lambda 25 spectrophotometer. Results and Discussion PAN–PMMA nanoparticles To realize the efficient and controlled fabrication of PAN-based carbon nanospheres from a PAN–PMMA nanoparticle precursor via the pyrolysis method, one

Carbon nano-onions as fluorescent on/off modulated nanoprobes for diagnostics

• Stefania Lettieri,
• Marta d’Amora,
• Adalberto Camisasca,
• Alberto Diaspro and
• Silvia Giordani

Beilstein J. Nanotechnol. 2017, 8, 1878–1888, doi:10.3762/bjnano.8.188

• HR 800 UV LabRam Raman microscope. For the Raman measurements, the samples were deposited directly on a silicon wafer and excited with a built-in 632 nm laser. Absorption and fluorescence spectroscopy Absorption spectra were recorded on an Agilent Cary 8454 UV–vis diode array spectrophotometer

• replicates and the error bars were the results of the standard deviations of these replicates. Emission spectra of BODIPY 3 (blue line: Excitation at 680 nm; emission at 737 nm) and BODIPY 4 (red line: Excitation at 600 nm; emission at 637 nm). Inset: absorption spectra of BODIPY 3 (blue line) and BODIPY 4

Self-assembly of chiral fluorescent nanoparticles based on water-soluble L-tryptophan derivatives of p-tert-butylthiacalix[4]arene

• Pavel L. Padnya,
• Irina A. Khripunova,
• Olga A. Mostovaya,
• Timur A. Mukhametzyanov,
• Vladimir G. Evtugyn,
• Vyacheslav V. Vorobev,
• Yuri N. Osin and
• Ivan I. Stoikov

Beilstein J. Nanotechnol. 2017, 8, 1825–1835, doi:10.3762/bjnano.8.184

• fragments. To explain all these facts, we recorded the absorption spectra of the compounds 8–11 and the ester 2. The spectra of all these compounds are identical: there is an absorption band of low intensity corresponding to the π→π* transition of the indole fragment in the longwave region [49] and it is

(Metallo)porphyrins for potential materials science applications

• Lars Smykalla,
• Carola Mende,
• Michael Fronk,
• Pablo F. Siles,
• Michael Hietschold,
• Georgeta Salvan,
• Dietrich R. T. Zahn,
• Oliver G. Schmidt,
• Tobias Rüffer and
• Heinrich Lang

Beilstein J. Nanotechnol. 2017, 8, 1786–1800, doi:10.3762/bjnano.8.180

• covered with 100 nm thick Au layers were applied. Variable angle spectroscopic ellipsometry (VASE) was used to determine the absorption spectra of the as-obtained thin films. The extinction coefficients of the thin films display the typical features expected for (metallo)porphyrins, including expected

• corresponding to the observed features in the absorption spectra. This indicates that the LUMO of these molecules generating the Q band is a formerly degenerated state undergoing Zeeman splitting in the magnetic field. With respect to the spectroscopic ellipsometry and magneto-optical Kerr effect spectroscopy

Methionine-mediated synthesis of magnetic nanoparticles and functionalization with gold quantum dots for theranostic applications

• Arūnas Jagminas,
• Agnė Mikalauskaitė,
• Vitalijus Karabanovas and
• Jūrate Vaičiūnienė

Beilstein J. Nanotechnol. 2017, 8, 1734–1741, doi:10.3762/bjnano.8.174

• . Typical UV–vis absorption spectra of aqueous methionine, tetrachlorauric acid and gold species solution are shown in Figure 3. The pure methionine solution does not exhibit any absorption peaks in the measured spectral range. For the chloroauric acid solution, however, a clearly resolved absorption peak

• responses of as-formed (1) and sonicated NPs in a 10 mmol·L−1 HAuCl4 solution, kept at a pH 12.2, at 37 °C for 4 h (2) are presented. HRTEM image of CoFe2O4@Met NPs after sonication in 15 mmol·L−1 HAuCl4 solution at 37 °C for 4 h (a) and their EDX spectrum (b). Absorption spectra of methionine (1

Fluorination of vertically aligned carbon nanotubes: from CF₄ plasma chemistry to surface functionalization

• Claudia Struzzi,
• Mattia Scardamaglia,
• Jean-François Colomer,
• Alberto Verdini,
• Luca Floreano,
• Rony Snyders and
• Carla Bittencourt

Beilstein J. Nanotechnol. 2017, 8, 1723–1733, doi:10.3762/bjnano.8.173

• increases again, due to the partial restoration of the delocalized charge in the conducting π orbitals. This effect is also observed in the near-edge absorption spectra acquired at the C–K edge (Figure 5b) where the peak at 285.4 eV (corresponding to the transition C 1s level to the unoccupied π* states

• Fermi level is depicted in the frame. For the same conditions, the absorption spectra acquired at C–K edge and F–K edge are reported in b) and c), respectively. The stability of the fluorination is presented as a function of time for four different samples containing increasing amount of fluorine

Three-in-one approach towards efficient organic dye-sensitized solar cells: aggregation suppression, panchromatic absorption and resonance energy transfer

• Jayita Patwari,
• Samim Sardar,
• Bo Liu,
• Peter Lemmens and
• Samir Kumar Pal

Beilstein J. Nanotechnol. 2017, 8, 1705–1713, doi:10.3762/bjnano.8.171

• two dyes increase the photocurrent as well as the efficiency of the device. From the absorption spectra of the co-sensitized photoanodes, PPIX was observed to be efficiently acting as a co-adsorbent and to reduce the dye aggregation problem of SQ2. It has further been proven by a comparison of the

• of designing strategies has been developed and reported in the literature in order to optimize the device performance and to minimize the effective costs [5][6][7][8][9][10]. A good spectral match between the absorption spectra of the sensitizer and the incident solar radiation is an essential

• that of the metallo-organic dyes because of their narrow absorption spectra, shorter excited-state lifetimes and the problem of self-aggregation on the semiconductor surface [14]. For efficient organic dye-sensitized solar cells, appreciated techniques to achieve a broad absorption window are either

Charge transfer from and to manganese phthalocyanine: bulk materials and interfaces

• Florian Rückerl,
• Daniel Waas,
• Bernd Büchner,
• Martin Knupfer,
• Dietrich R. T. Zahn,
• Francisc Haidu,
• Torsten Hahn and
• Jens Kortus

Beilstein J. Nanotechnol. 2017, 8, 1601–1615, doi:10.3762/bjnano.8.160

• revealed by polarization dependent X-ray absorption spectroscopy (XAS) studies [127]. In Figure 12 we present corresponding N 1s absorption spectra for pure MnPc and two different film thicknesses of an F16CoPc overlayer, deposited on a gold single crystal. Different light polarizations with respect to the

• different polarization directions of the incident synchrotron radiation, as depicted in Figure 13. The data for a 3 nm thick F16CoPc film on top of MnPc are very similar to the corresponding absorption spectra of pure CoPc on gold [130]. This indicates that fluorination of CoPc has little impact on the

• reaction between F16CoPc and MnPc at the corresponding interface, which affects the cobalt states of F16CoPc. This conclusion is supported by equivalent investigations of CoPc monolayers on gold and silver surfaces, where similar changes in the absorption spectra were observed and where a charge transfer

Bright fluorescent silica-nanoparticle probes for high-resolution STED and confocal microscopy

• Isabella Tavernaro,
• Christian Cavelius,
• Henrike Peuschel and
• Annette Kraegeloh

Beilstein J. Nanotechnol. 2017, 8, 1283–1296, doi:10.3762/bjnano.8.130

• influence of the integration. The spectra seem to be approximately the same (less than a few nanometres peak shift to longer wavelengths), showing two maxima for the Atto647N dye (Figure S16, Supporting Information File 1) in the absorption spectra, whereas the fluorescence spectra of the dye-modified

Synthesis, spectroscopic characterization and thermogravimetric analysis of two series of substituted (metallo)tetraphenylporphyrins

• Rasha K. Al-Shewiki,
• Carola Mende,
• Roy Buschbeck,
• Pablo F. Siles,
• Oliver G. Schmidt,
• Tobias Rüffer and
• Heinrich Lang

Beilstein J. Nanotechnol. 2017, 8, 1191–1204, doi:10.3762/bjnano.8.121

• terminal –C(O)NR2 groups. UV–vis studies The UV–vis absorption spectra of 2/2a–d and 3/3a–d were recorded in CHCl3 solution in the spectral range of 230–700 nm. In order to avoid possible impact of the concentrations on λabs and ε, which was reported for (metallo)phthalocyanines [28], we performed

• concentration-dependent UV–vis measurements. According to [28] the nature (cofacial, face-to-face, tilted) and degree (dimer, oligomer, polymer) of mutual interactions between (metallo)phthalocyanine molecules might modify their optical absorption spectra [28]. However, the UV–vis studies of 2/2a–d and 3/3a–d

• of 480–700 nm. Optical absorptions are numbered in relation to the wavelength, λabs and log ε values are summarized in Table 2. Generally, absorption spectra of free-base porphyrins consist of characteristic absorption bands: The more intense Soret band (or B band) arising from a1u(π)→eg*(π

Surface-enhanced Raman spectroscopy of cell lysates mixed with silver nanoparticles for tumor classification

• Mohamed Hassoun,
• Iwan W.Schie,
• Tatiana Tolstik,
• Sarmiza E. Stanca,
• Christoph Krafft and
• Juergen Popp

Beilstein J. Nanotechnol. 2017, 8, 1183–1190, doi:10.3762/bjnano.8.120

• after testing each batch permutation were summed up. UV–vis absorption spectra of (a) silver nanoparticles with an absorption band at 415 nm and (b) solution of silver nanoparticles and potassium chloride. The absorption band of aggregated nanoparticles was shifted to near infrared region. (a) Scanning

Enhanced catalytic activity without the use of an external light source using microwave-synthesized CuO nanopetals

• Govinda Lakhotiya,
• Sonal Bajaj,
• Arpan Kumar Nayak,
• Debabrata Pradhan,
• Pradip Tekade and
• Abhimanyu Rana

Beilstein J. Nanotechnol. 2017, 8, 1167–1173, doi:10.3762/bjnano.8.118

• the same morphology, further experiments were performed with as-synthesized nanopetals. Optical study The UV–vis absorption spectra of as-synthesized CuO nanopetals is shown in the Figure 2a. It reflects a wide absorption spectrum up to 700 nm covering almost the entire visible spectrum. The

• suspension at regular intervals and were centrifuged to filter suspended CuO powder. The MB concentration in the filtered suspension was studied with a Perkin Elmer Lambda 750 UV–vis spectrophotometer. Figure 2b shows the UV–vis absorption spectra of the aliquots taken out at different time intervals. In

• out to investigate the effect of different concentrations of H2O2 for MB degradation in the absence of CuO nanopetals (catalyst) without any irradiation (UV/visible light). Figure 2c shows the UV–vis absorption spectra for different concentrations of H2O2 in MB solution, without catalyst, after one

AgCl-doped CdSe quantum dots with near-IR photoluminescence

• Pavel A. Kotin,
• Sergey S. Bubenov,
• Natalia E. Mordvinova and
• Sergey G. Dorofeev

Beilstein J. Nanotechnol. 2017, 8, 1156–1166, doi:10.3762/bjnano.8.117

• spherical particles doped with AgCl. The absorption spectra of TPs begin at 2.0 eV. The black arrow in Figure 11 shows an increase in the intensity of the 2S3/2-1Se transition against the background of 1S3/2-1Se (blue arrow), which is connected with the increase of legs of TPs [30]. Low-energy regions of

ZnO nanoparticles sensitized by CuInZn_xS_2+x quantum dots as highly efficient solar light driven photocatalysts

• Florian Donat,
• Serge Corbel,
• Halima Alem,
• Steve Pontvianne,
• Lavinia Balan,
• Ghouti Medjahdi and
• Raphaël Schneider

Beilstein J. Nanotechnol. 2017, 8, 1080–1093, doi:10.3762/bjnano.8.110

• the ZnO/ZCIS nanoparticles was determined using a Malvern Zetasizer Nano ZS instrument. All the optical measurements were conducted at room temperature (20 ± 1 °C) under ambient conditions. The absorption spectra of liquid samples were recorded on a Thermo Scientific Evolution 220 UV–visible

Assembly of metallic nanoparticle arrays on glass via nanoimprinting and thin-film dewetting

• Sun-Kyu Lee,
• Sori Hwang,
• Yoon-Kee Kim and
• Yong-Jun Oh

Beilstein J. Nanotechnol. 2017, 8, 1049–1055, doi:10.3762/bjnano.8.106

• substrates, the method presented here can extend the applications of metal nanoparticles for several optical purposes. (a) Silicon master mold with inverted pyramidal pits and (b) PDMS stamp with the transferred pattern. The inset in (b) is a high-magnification image. Evolution of the FTIR absorption spectra

Vapor-phase-synthesized fluoroacrylate polymer thin films: thermal stability and structural properties

• Paul Christian and
• Anna Maria Coclite

Beilstein J. Nanotechnol. 2017, 8, 933–942, doi:10.3762/bjnano.8.95

• Bruker IFS 66v/s spectrometer in transmission mode, with all the data being converted to absorption spectra by the OPUS software. The data are automatically baseline corrected by a custom routine written in R, utilizing the algorithms provided in the baseline package [18]. Specular X-ray diffraction (XRD

High photocatalytic activity of Fe₂O₃/TiO₂ nanocomposites prepared by photodeposition for degradation of 2,4-dichlorophenoxyacetic acid

• Shu Chin Lee,
• Hendrik O. Lintang and
• Leny Yuliati

Beilstein J. Nanotechnol. 2017, 8, 915–926, doi:10.3762/bjnano.8.93

• patterns of the TiO2 and the Fe2O3/TiO2 samples prepared by both impregnation and photodeposition methods using a Cu Kα radiation source (λ = 0.15406 nm) at 40 kV and 40 mA. A Shimadzu UV-2600 DR UV−vis spectrophotometer was used to record the absorption spectra of samples, in which barium sulfate (BaSO4

Dispersion of single-wall carbon nanotubes with supramolecular Congo red – properties of the complexes and mechanism of the interaction

• Anna Jagusiak,
• Barbara Piekarska,
• Tomasz Pańczyk,
• Małgorzata Jemioła-Rzemińska,
• Elżbieta Bielańska,
• Barbara Stopa,
• Grzegorz Zemanek,
• Janina Rybarska,
• Irena Roterman and
• Leszek Konieczny

Beilstein J. Nanotechnol. 2017, 8, 636–648, doi:10.3762/bjnano.8.68

• the experimental analysis of functionalization of nanotubes with Congo red, aimed to explain the role of dye supramolecularity and the mechanism of nanotube–CR interaction. Results and Discussion Properties of SWNT–CR complexes – the role of CR supramolecularity Comparison of the absorption spectra of

• total amount of CR added to the sample. UV–vis absorption spectra were recorded on a Cary 300Bio Varian spectrophotometer. Absorption coefficient for CR: ε489 = 50.46 M−1·cm−1. In order to avoid errors caused by clogging of the membrane (in case of samples containing higher amounts of CR) the filtering

• ), deformation (the indentation of the surface under the tip), dispersion (dissipation, loss of energy of microcantilever of scanning probe when passing through different areas on the sample surface). Absorption spectra of free Congo red (A) and SWNT-bound Congo red (D) (0.05 M Tris/HCl buffer, pH 7.4); Congo

Fabrication of black-gold coatings by glancing angle deposition with sputtering

• Alan Vitrey,
• Rafael Alvarez,
• Alberto Palmero,
• María Ujué González and
• José Miguel García-Martín

Beilstein J. Nanotechnol. 2017, 8, 434–439, doi:10.3762/bjnano.8.46

• nanostructured Au sample prepared with σ = 85° (right). (b) Transmittance, reflectance and absorption spectra of those samples. Acknowledgements The authors thank MINECO (Projects MAT2014-59772-C2-1, MAT2015-69035-REDC) for financial support.

Comparison of four methods for the biofunctionalization of gold nanorods by the introduction of sulfhydryl groups to antibodies

• Xuefeng Wang,
• Zhong Mei,
• Yanyan Wang and
• Liang Tang

Beilstein J. Nanotechnol. 2017, 8, 372–380, doi:10.3762/bjnano.8.39

• change in longitudinal plasmon wavelength when the refractive index alteration was elicited by target binding to the GNRs surface [10][14]. Figure 2 shows the absorption spectra of GNRs after conjugating with various thiolated anti-IgG. This conjugation resulted in a red shift in the longitudinal peak of

• thiolated-anti-IgG were stored in 0.01 M PBS buffer at 4 °C for months. Figure S3 (Supporting Information File 1) shows the absorption spectra of 728 nm GNR conjugated with anti-IgG for 3 months by the four modified methods. The lack of peak broadening and the minimal spectrum change indicate that the

• shows the absorption spectra of the GNR biochip in the response of the local refractive index elicited by specific antigen–antibody interaction. Figure 6 exhibits the LSPR red shift in response to the human IgG concentration. Consistent with the results in our previous work [17], a constant increase in

Nanoscale isoindigo-carriers: self-assembly and tunable properties

• Tatiana N. Pashirova,
• Andrei V. Bogdanov,
• Lenar I. Musin,
• Julia K. Voronina,
• Irek R. Nizameev,
• Marsil K. Kadirov,
• Vladimir F. Mironov,
• Lucia Ya. Zakharova,
• Shamil K. Latypov and
• Oleg G. Sinyashin

Beilstein J. Nanotechnol. 2017, 8, 313–324, doi:10.3762/bjnano.8.34

• available classical anionic (SDS), cationic (CTAB) and nonionic (Tween 80) surfactants. Because isatin and isoindigo derivatives are new dyes, their extinction coefficients were determined for the first time. UV–vis absorption spectra of 2a–h and 3 in chloroform are presented in Figures S11–S18 (Supporting

• Information File 1). The absorption spectra of 1g in different solvents (CHCl3, EtOH and DMF, Figures S19–S21, Supporting Information File 1) were also recorded. The maximum absorption wavelength of 1g (λmax = 300 nm) does not vary significantly with the type of solvent. The extinction coefficients of the

Photocatalysis applications of some hybrid polymeric composites incorporating TiO₂ nanoparticles and their combinations with SiO₂/Fe₂O₃

• Andreea Laura Chibac,
• Tinca Buruiana,
• Violeta Melinte and
• Emil C. Buruiana

Beilstein J. Nanotechnol. 2017, 8, 272–286, doi:10.3762/bjnano.8.30

• of about 200 μm), with hybridized TiO2 NPs were further examined through UV–vis analysis and the absorption spectra are given in Figure 5. It should be pointed out that the samples S1 (with TiO2 NPs) and S2 (with TiO2/SiO2 NPs) films have no absorption in the visible region. These films absorb only

• photodecomposition process of an aqueous solution of phenol (1.06 × 10−3 M) in the presence of hybrid materials with TiO2 nanoparticles, pure or combined with SiO2 and/or Fe2O3, was investigated by monitoring the characteristic absorption band of phenol at λ = 270 nm. Figure 6a,b shows the UV–vis absorption spectra

• performed. As expected, S1 exhibited a very low photodegradation activity (Figure 7a), only 10% of phenol being reduced after 250 min of visible-light irradiation. The UV–vis absorption spectra measured in the presence of S4 hybrid (Figure 7b) show that phenol is decomposed with increasing irradiation time

Photo-ignition process of multiwall carbon nanotubes and ferrocene by continuous wave Xe lamp illumination

• Paolo Visconti,
• Patrizio Primiceri,
• Daniele Longo,
• Luciano Strafella,
• Paolo Carlucci,
• Mauro Lomascolo,
• Arianna Cretì and
• Giuseppe Mele

Beilstein J. Nanotechnol. 2017, 8, 134–144, doi:10.3762/bjnano.8.14

• -induced ignition process, the absorption spectra of MWCNT/ferrocene mixtures and ferrocene only were obtained. The experimental results show that the luminous power (related to the entire spectrum of the Xe lamp) needed to trigger the ignition of MWCNT/ferrocene mixtures decreases with increasing metal

• itself in its excited form and is thus capable of promoting electron transfer to MWCNTs. In this way, the resulting radical species, FeCp2+∙ and MWCNT−, easily react with oxygen giving rise to the ignition of MWCNT/ferrocene samples. Keywords: absorption spectra; CW Xe light source; metal nanoparticle

• previously mentioned works. The experimental photo-ignition tests were carried out using varying weight ratios of mixtures, incident luminous power, and wavelength range of incident Xe light. In addition, in order to better understand the photo-induced ignition process, absorption spectra measurements of

Streptavidin-coated gold nanoparticles: critical role of oligonucleotides on stability and fractal aggregation

• Roberta D'Agata,
• Pasquale Palladino and
• Giuseppe Spoto

Beilstein J. Nanotechnol. 2017, 8, 1–11, doi:10.3762/bjnano.8.1

• displayed by absorption spectra after the absorption of SA can be used to predict the mass of protein absorbed per unit area [31]. The prediction is based on the assumption that AuNP-SA can be depicted as a sphere with a homogeneous spherical shell. On this basis, the spectral shift (Δλ) is given by