Oxidative stabilization of polyacrylonitrile nanofibers and carbon nanofibers containing graphene oxide (GO): a spectroscopic and electrochemical study

• İlknur Gergin,
• Ezgi Ismar and
• A. Sezai Sarac

Beilstein J. Nanotechnol. 2017, 8, 1616–1628, doi:10.3762/bjnano.8.161

• electron–phonon interactions of the material [51]. ATR-FTIR spectroscopy of oxidized PAN/GO nanofibers The ATR-FTIR results show a broad OH stretching peak of GO around 3300 cm−1 [57] and the C–H vibrations of the CH, CH2 and CH3 structures of oxidized polyacrylonitrile around 2920 cm−1 [38][40]. Through

Formation of ferromagnetic molecular thin films from blends by annealing

• Peter Robaschik,
• Ye Ma,
• Salahud Din and
• Sandrine Heutz

Beilstein J. Nanotechnol. 2017, 8, 1469–1475, doi:10.3762/bjnano.8.146

• collaborators [23]. Both peaks vanish for every annealed sample proving that all TCNQ molecules sublime during the annealing process. The ν(C–C) (1429 and 1334 cm−1) and ν(C–N) (1289 cm−1) vibrations of the MnPc isoindole [24] are preserved for the annealed neat film and the annealed mixed film with cover

• for the same films deposited on KBr substrates. The green frame highlights the range of 2050–2300 cm−1 where the ν(C≡N) stretching peaks for TCNQ appear. The pink frames show the area of the MnPc isoindole vibrations around 1225–1475 cm−1 and the γ(C-H) out-of-plane deformation of the MnPc ligand at

Comprehensive Raman study of epitaxial silicene-related phases on Ag(111)

• Dmytro Solonenko,
• Ovidiu D. Gordan,
• Guy Le Lay,
• Dietrich R. T. Zahn and
• Patrick Vogt

Beilstein J. Nanotechnol. 2017, 8, 1357–1365, doi:10.3762/bjnano.8.137

• asymmetric shoulder of the L(T)O phonon mode of Si nanocrystallites, yet the analysis is complicated. The Raman band at 155 cm−1 is present in both geometries, which hints at its disorder-related origin, since only the vibrations of ordered crystalline structures follow Raman selection rules. Its broad

3D continuum phonon model for group-IV 2D materials

• Morten Willatzen,
• Lok C. Lew Yan Voon,
• Appala Naidu Gandi and
• Udo Schwingenschlögl

Beilstein J. Nanotechnol. 2017, 8, 1345–1356, doi:10.3762/bjnano.8.136

• either failed to recognize it [8] or were unable to explain it [1]. An alternative model of lattice vibrations is a classical continuum model, which is expected to reproduce most accurately phonons with wavelengths longer than lattice separations, i.e., near k = 0. One of the earliest such models applied

• parameterized the dispersion relations to match the experimental data. In all of the above, the out-of-plane vibrations were assumed decoupled from the in-plane ones. In this paper, a continuum theory of acoustic and optical phonons in 2D nanomaterials is derived from first principles, contrary to earlier

• before, which led to a decoupling of the out-of-plane vibrations. The coupling is a consequence of the finite thickness of the sheet with no mirror symmetry imposed. Thus, our model is sufficiently general to apply to multilayers. Earlier DFT calculations [15] had argued that there is no coupling between

Oxidative chemical vapor deposition of polyaniline thin films

• Yuriy Y. Smolin,
• Masoud Soroush and
• Kenneth K. S. Lau

Beilstein J. Nanotechnol. 2017, 8, 1266–1276, doi:10.3762/bjnano.8.128

• 1168 cm−1 peak is attributed to –NH+= stretching and in-plane CH vibrations that suggests the formation of PANI in the salt (doped) form [46][47]. The 821 cm−1 peak is typically assigned to out-of-plane CH vibrations [47] that is consistent with high molecular weight PANI due to para-di-substitutions

• case and therefore much less oxidant is available for oxidizing the PANI film. Second, the peaks of the lowest Fo condition (F2) also indicate that some of the film may contain oligomers. For instance, the peak at 1635 cm−1 can be assigned to NH scissoring vibrations of the aromatic amines [52

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

• Information File 1 shows the IR spectra of 2/3 and of 2a–d/3a–d as obtained by FTIR measurements with a Nicolet iS10 spectrometer (ATR attachment, ZnSe crystal) for comparison. For the porphyrins 2 and 3 three different N–H vibrations at 3310–3326 cm−1, 975–990 cm−1 and 675–700 cm−1 are expected according to

• [25]. The one observed at 3317 cm−1 for both 2 and 3 (Supporting Information File 1) fits well into the expected range. The vibrations no. 5 and no. 13 for 2 (966 and 732 cm−1) and 3 (968 and 737 cm−1), cf. Figure 2 and Figure 3 and Table 1, are attributed to the other two N–H vibrations. They deviate

• to some extend from the expected ranges, see above, but the corresponding metalloporphyrins do not show related vibrations (Figure 2 and Figure 3). The spectral range from 3000 to 2800 cm−1 is governed by νas(C–H) and νs(C–H) absorptions of the aliphatic substituents R of the –C(O)NR2 groups of both

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

• bonds. It probes the molecular vibrations of all cellular biomolecules, such as nucleic acids, proteins, lipids and carbohydrates and provides chemical fingerprint spectra of cells. The throughput of spontaneous Raman spectroscopy for cell classification is limited to the range of one cell per second by

• and metabolites appear at 723 and 1339 cm−1 and can be assigned to adenine ring-breathing modes [18][26][27]. Protein vibrations contribute to the band at 900 cm−1. The bands at 800 and 960 cm−1 can be assigned to CN stretching vibrations. Carbohydrates are represented by bands in the spectral region

• of 1000–1100 cm−1. The bands at 1289 cm−1 and 1660 cm−1 can be assigned to the amide III and amide I vibrational modes of peptide bonds in proteins, respectively [18][26][28]. The band at 1450 cm−1 arises from CH2 deformation vibrations of all biomolecules. The bands at 2923 and 2952 cm−1 can be

Adsorption characteristics of Er₃N@C₈₀on W(110) and Au(111) studied via scanning tunneling microscopy and spectroscopy

• Sebastian Schimmel,
• Zhixiang Sun,
• Danny Baumann,
• Denis Krylov,
• Nataliya Samoylova,
• Alexey Popov,
• Bernd Büchner and
• Christian Hess

Beilstein J. Nanotechnol. 2017, 8, 1127–1134, doi:10.3762/bjnano.8.114

• states occurs, the effective transfer of electrons remains relatively subtle. Nevertheless, the broadening of the peaks (≈1 eV) clearly exceeds the room temperature energy broadening (≈0.1 eV). Typical energies of intramolecular vibrations are also in the order of ≤0.2 eV. It remains unclear, to what

Fully scalable one-pot method for the production of phosphonic graphene derivatives

• Kamila Żelechowska,
• Marta Prześniak-Welenc,
• Marcin Łapiński,
• Izabela Kondratowicz and
• Tadeusz Miruszewski

Beilstein J. Nanotechnol. 2017, 8, 1094–1103, doi:10.3762/bjnano.8.111

• 3700–3100 cm−1 is characteristic for –OH groups of different origin. The band centered at 3600 cm−1 comes from the vibrations of free phenolic –OH groups. The next band, at 3392 cm−1 with a side band at 3210 cm−1 indicates the presence of –OH groups from carboxylic groups, along with –OH from adsorbed

• water molecules due to high hydrophilicity of the GO. The well-developed band at 1730 cm−1 confirms the presence of carboxylic groups in the GO. Stretching vibrations of double carbon–carbon bonds in the GO structure gave the expected band at 1625 cm−1. The position of the band indicates that such bonds

• are conjugated with C=C or C=O bonds. Small bands at 1815 cm−1 and 1369 cm−1 are characteristic for C=O and C–O stretchings in lactones, respectively. Other bands at lower wavenumbers (1228–970 cm−1) can be ascribed to C-O vibrations in carboxyl, phenol and/or epoxide functionalities. Significant

Nanoantenna-assisted plasmonic enhancement of IR absorption of vibrational modes of organic molecules

• Alexander G. Milekhin,
• Olga Cherkasova,
• Sergei A. Kuznetsov,
• Ilya A. Milekhin,
• Ekatherina E. Rodyakina,
• Alexander V. Latyshev,
• Sreetama Banerjee,
• Georgeta Salvan and
• Dietrich R. T. Zahn

Beilstein J. Nanotechnol. 2017, 8, 975–981, doi:10.3762/bjnano.8.99

• enhance the SEIRA signal by molecular vibrations in model adsorbates such as octadecanthiol (ODT) [16] and 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) by up to five orders of magnitude [17]. The IR absorption bands of these molecules become pronounced, even for molecular monolayers, by tuning the localized

• surface plasmon energy of the nanoantennas to the energy of the molecular vibrations. Along with SEIRA, SERS is also traditionally used to study the vibrational spectra of various organic and biological substances [18], which may be present in very low quantities down to single molecules [19]. Raman

• -of-plane) bending of C–H bonds and the Co–N bond vibrations [26][27][28]. Au nanoantenna arrays with structural parameters (nanoantenna length and period) designed to ensure the LSPR band energy from 600 to 1000 cm−1 were fabricated (Figure 4a). In order to determine the structural parameters of the

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

• characteristic absorption peaks are noted. In the fingerprint region (1500–500 cm−1), the skeletal vibrations of the CHx and CFx groups are visible, most prominently featuring the symmetric and antisymmetric stretch of the CF2 groups at 1251 and 1206 cm−1, respectively. In addition, a strong absorption peak is

• resulting in two distinct peaks of C–O stretching at 1257 and 1158 cm−1 for p-EGDMA. Additional peaks in the regions of 1480–1450 cm−1 and 3000–2800 cm−1 in the spectra of the cross-linked polymers are attributed to deformation and stretching vibrations of the CHx groups, respectively. Interestingly, a

Synthesis of coaxial nanotubes of polyaniline and poly(hydroxyethyl methacrylate) by oxidative/initiated chemical vapor deposition

• Alper Balkan,
• Efe Armagan and
• Gozde Ozaydin Ince

Beilstein J. Nanotechnol. 2017, 8, 872–882, doi:10.3762/bjnano.8.89

• The deposition of PANI films on a Si wafer was confirmed by Fourier-transform infrared (FTIR) analysis (Figure 1a). The broad peaks at 2850–3100 cm−1 and 3100–3600 cm−1 correspond to C–H and N–H stretching vibrations, respectively. The peak at 1590 cm−1 can be attributed to the quinoid ring stretching

• , while the peak at 1495 cm−1 is due to the benzenoid ring stretching [42]. A complementary structural analysis was performed with Raman spectroscopy (Figure 1b). The peak at 1193 cm−1 is due to C–H vibrations bending in benzoid units. The peaks at 1223 and 1272 cm−1 correspond to the bands related to

• amine groups. Between 1332 and 1376 cm−1, the vibrations of delocalized polaronic structures can be observed. The peaks at 1458 and 1569 cm−1 correspond to C=N and C=C stretching vibrations in quinoid units, respectively. At 1638 cm−1, the peak for C–C stretching vibrations in benzoid units is present

Measuring adhesion on rough surfaces using atomic force microscopy with a liquid probe

• Juan V. Escobar,
• Cristina Garza and
• Rolando Castillo

Beilstein J. Nanotechnol. 2017, 8, 813–825, doi:10.3762/bjnano.8.84

• chamber to work under vacuum (better than 1 × 10−4 Pa) or in an inert atmosphere. Vacuum evacuation is performed with a 300 L/s magnetic turbo molecular pump and a rotatory pump, both properly isolated from the AFM head to avoid spurious vibrations. Hooke's law gives the tip–sample force, Fc = −kcδc

Recombinant DNA technology and click chemistry: a powerful combination for generating a hybrid elastin-like-statherin hydrogel to control calcium phosphate mineralization

• Mohamed Hamed Misbah,
• Mercedes Santos,
• Luis Quintanilla,
• Christina Günter,
• Matilde Alonso,
• Andreas Taubert and
• José Carlos Rodríguez-Cabello

Beilstein J. Nanotechnol. 2017, 8, 772–783, doi:10.3762/bjnano.8.80

• attributed to amide I (C=O stretching), amide II (mainly C–N stretching), and amide III (N–H in plane deformation) vibrations, respectively [49][50]. In addition, the bands at around 1333 and 1097 cm−1 are assigned to δ(CH) and N–Cα vibrations, respectively. The signals between 1400 and 1500 cm−1 are

• attributed to CH3 asymmetric bending, CH2 scissoring, and COO− symmetric stretching vibrations. The band at around 1018 cm−1 is assigned to nonstoichiometric apatites containing HPO42− ions, whereas the shoulder at around 1084 cm−1 is assigned to the ν3(PO4)3− vibration in stoichiometric HA [51][52][53]. The

First examples of organosilica-based ionogels: synthesis and electrochemical behavior

• Andreas Taubert,
• Ruben Löbbicke,
• Barbara Kirchner and
• Fabrice Leroux

Beilstein J. Nanotechnol. 2017, 8, 736–751, doi:10.3762/bjnano.8.77

• representative ATR-IR spectra of two dried monoliths. The spectra of all samples are virtually identical and exhibit fairly broad bands in all cases. All spectra show C–H bending vibrations at 770, 850, and 950 cm−1. Bands at 900, 1010, and 1080 cm−1 are due to asymmetric and symmetric Si–O–Si stretching

• vibrations and Si–OH silanol groups on the silica surface. Broad bands between 3000 and 3400 cm−1 originate from Si–OH, H2O, C–N, and N–H stretching vibrations. A further characteristic N–H stretching vibration is observed at 2055 cm−1 [48]. Figure 6 shows a representative small angle X-ray scattering (SAXS

• neat IL [BmimSO3H][PTS], the bands can be assigned to the C–N and C–H stretching vibration modes of the imidazolium ring (3151, 3112, 2957, and 2922 cm−1), CH3–N and CH2–N stretching modes and C–C stretching vibrations of the imidazolium ring (1602, 1573, 1456, and 1229 cm−1), and out of plane C–H

α-((4-Cyanobenzoyl)oxy)-ω-methyl poly(ethylene glycol): a new stabilizer for silver nanoparticles

• Jana Lutze,
• Miguel A. Bañares,
• Marcos Pita,
• Andrea Haase,
• Andreas Luch and
• Andreas Taubert

Beilstein J. Nanotechnol. 2017, 8, 627–635, doi:10.3762/bjnano.8.67

• , δ(CO)), 659 (sh, δ(CO)), 613 (m, scissoring NO2), 569 (vw, CN in plane bending), 523 (w, δ(OCC)), 504 (sh, 1,4-disubstituted aromatic ring bending), 396 (vw, δ(CCN), 347 (vw, δ(COC), δ(OCC)), 311 (vw, possibly due to general skeletal vibrations). Cleavage experiments For evaluating the cleavage of

• product confirm the successful formation of CBAmPEG, Figure 1. The ATR-IR spectra show bands at 2947, 2885, 2742, 2696, 1466, 1412, 1358, 1342, 1281, 1242, 1061, 960, and 845 cm−1 that can be assigned to various C–H vibrations (see Experimental section for specific assignments). Bands at 1724, 1146, 1107

• , and 768 cm−1 can be assigned to C=O and C–O vibrations. Finally, a band at 694 cm−1 is due to phenyl ring bending vibrations. Signals in the 1H NMR spectra are due to the aromatic protons of the phenyl group (8.05 ppm), the methylene (4.53 ppm, 2 H atoms) protons adjacent to the ester linker unit, and

Nanostructured carbon materials decorated with organophosphorus moieties: synthesis and application

• Giacomo Biagiotti,
• Vittoria Langè,
• Cristina Ligi,
• Stefano Caporali,
• Maurizio Muniz-Miranda,
• Anna Flis,
• K. Michał Pietrusiewicz,
• Giacomo Ghini,
• Alberto Brandi and
• Stefano Cicchi

Beilstein J. Nanotechnol. 2017, 8, 485–493, doi:10.3762/bjnano.8.52

• , compound 8 and 9 (see Figure 3). Generally, CNMs show two main bands in their Raman spectra: one at ≈1580 cm−1 (G band) related to sp2 graphitic domain and the second at ≈1360 cm−1 (D band) attributed to the amorphous carbon or deformation vibrations of a hexagonal ring [15]. Raman spectra of ox-MWCNTs 4

Fiber optic sensors based on hybrid phenyl-silica xerogel films to detect n-hexane: determination of the isosteric enthalpy of adsorption

• Jesús C. Echeverría,
• Ignacio Calleja,
• Paula Moriones and
• Julián J. Garrido

Beilstein J. Nanotechnol. 2017, 8, 475–484, doi:10.3762/bjnano.8.51

• groups into the xerogels can be monitored by the peaks located between 3100 and 3000 cm−1, which are assigned to C–H vibrations of the aromatic ring. The peaks at ≈3055 cm−1 and 3076 cm−1 are attributed to the C–H vibrations of the phenyl groups. The peak at ≈1431 cm−1 is attributed to the C=C vibration

Functionalized TiO₂ nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

• Antoine R. M. Dalod,
• Lars Henriksen,
• Tor Grande and
• Mari-Ann Einarsrud

Beilstein J. Nanotechnol. 2017, 8, 304–312, doi:10.3762/bjnano.8.33

• conclusions regarding both the morphology and the particles sizes (Table 2) showing the growth of the TiO2-HT nanoparticles. The FTIR investigations of the heat-treated nanoparticles (Figure 7b) show absorption bands at 1050 and 1150 cm−1, which were assigned to Si–O–Si vibrations in silica [39] and a weak

• shoulder centered at 930 cm−1 was assigned to Ti–O–Si vibrations, in addition of the large absorption band below 900 cm−1 due to Ti–O–Ti vibrations. The EDS maps of the Ti-APTES-HT nanoparticles (Figure 9) show that silicon is homogeneously distributed over the particles. EDS spectra over relatively large

Nanocrystalline ZrO₂ and Pt-doped ZrO₂ catalysts for low-temperature CO oxidation

• Amit Singhania and
• Shipra Mital Gupta

Beilstein J. Nanotechnol. 2017, 8, 264–271, doi:10.3762/bjnano.8.29

• %)-ZrO2 are shown in Figure 7. Peaks at 3446 and 1628 cm−1 corresponding to the ν(O–H) and δ(OH) vibrations of H2O can be seen. In general, residual water and hydroxy groups are found in the materials regardless of the used preparation method [37]. The FTIR spectra of both samples show bands between 500

• –1190 cm−1, which correspond to Zr–O stretching vibrations. Two broad bands at 1380 and 1432 cm−1 appeared due to the carbonate group. These FTIR results are similar to others reported in literature [3][4]. Catalytic activity The catalytic activity of ZrO2 and Pt(1%)-ZrO2 was evaluated for the oxidation

Surface-enhanced Raman scattering of self-assembled thiol monolayers and supported lipid membranes on thin anodic porous alumina

• Marco Salerno,
• Amirreza Shayganpour,
• Barbara Salis and
• Silvia Dante

Beilstein J. Nanotechnol. 2017, 8, 74–81, doi:10.3762/bjnano.8.8

• spectra obtained on tAPA–Au for both MbA and AT. The spectra of each thiol in all forms (pristine powder and film adsorbed onto the flat Au and tAPA–Au substrate) look similar. MbA present two major peaks at ≈1593 and ≈1076 cm−1, which can be ascribed to aromatic ring vibrations, and also at ≈1181 and at

• aromatic ring vibrations, and ≈1181 cm−1, ascribed to C–H deformation, appear. Also AT presents the major peaks at ≈1580, ≈1159 and ≈1074 cm−1, due to C–NH, N–H wagging and C–C stretching mode, respectively. Additionally, in Figure 4 we have bands from the lipids, namely ≈1656 cm−1 (C=C stretching), ≈1440

• post-production etching, resulting in oxide films with pores of ≈160 nm size and ≈80 nm wall thickness. After coating with a ≈25 nm Au layer covering the tAPA features, our substrates become SERS-active and allow for an investigation of the chemical vibrations of molecules, as demonstrated by sensitive

From iron coordination compounds to metal oxide nanoparticles

• Mihail Iacob,
• Carmen Racles,
• Codrin Tugui,
• George Stiubianu,
• Adrian Bele,
• Liviu Sacarescu,
• Daniel Timpu and
• Maria Cazacu

Beilstein J. Nanotechnol. 2016, 7, 2074–2087, doi:10.3762/bjnano.7.198

• different from the bands assigned to the acetate group (1586, 1420 cm−1) in the IR spectrum of the initial mixed-valence iron acetate. The strong bands at 2851, 2922, and 2954 cm−1 are assigned to asymmetric and symmetric stretching vibrations, νas,s, of CH3 and CH2 groups, which are found in larger

• quantities in the structure of the fatty acid coating of the nanoparticle surface. The medium intensity bands at 3317 and 3391 cm−1 correspond to ν(OH) vibrations [26]. In the IR spectrum of the NPT1b sample (Supporting Information File 1, Figure S2) (the bands mentioned above) characteristic of the organic

• ) revealed the presence of stabilizing agents on the surface of the particles. As discussed above, the bands at 2853–2955 cm−1 attributed to symmetric and asymmetric stretching vibrations of the saturated C–H bond of the groups CH2 and CH3 [27] are present in the spectra of all samples, indicating the

Fundamental properties of high-quality carbon nanofoam: from low to high density

• Natalie Frese,
• Shelby Taylor Mitchell,
• Christof Neumann,
• Amanda Bowers,
• Armin Gölzhäuser and
• Klaus Sattler

Beilstein J. Nanotechnol. 2016, 7, 2065–2073, doi:10.3762/bjnano.7.197

• be due to unidentified vibrations of various types of nanocarbons and possibly of hydrocarbons adsorbed in the foams. We note that at 1180 cm−1, a peak was determined for nanocrystalline diamond films [53]. Also, two Raman features at 1180 and 1490 cm−1 in addition to the G and D peaks were observed

A novel electrochemical nanobiosensor for the ultrasensitive and specific detection of femtomolar-level gastric cancer biomarker miRNA-106a

• Maryam Daneshpour,
• Kobra Omidfar and
• Hossein Ghanbarian

Beilstein J. Nanotechnol. 2016, 7, 2023–2036, doi:10.3762/bjnano.7.193

• . The results indicated a remarkable peak near 520 nm in the gold (curve a) and final gold–magnetic (curve d) NPs analysis. This peak, which forms because of the excitation of surface plasmon vibrations and corroborates the presence of spherical gold NPs, is predictably absent in UV–vis absorption

Intercalation and structural aspects of macroRAFT agents into MgAl layered double hydroxides

• Dessislava Kostadinova,
• Ana Cenacchi Pereira,
• Muriel Lansalot,
• Franck D’Agosto,
• Elodie Bourgeat-Lami,
• Fabrice Leroux,
• Christine Taviot-Guého,
• Sylvian Cadars and
• Vanessa Prevot

Beilstein J. Nanotechnol. 2016, 7, 2000–2012, doi:10.3762/bjnano.7.191

• intensity decrease of the nitrate vibration band at 1350 cm−1 (Figure 4), and the increasing intensities of new vibrations in both the 2961–2877 cm−1 region (νCH3, νCH2, νCH) and the 1750–1150 cm−1 region (νC–O, νC=O). For the PAA49-CTPPA-intercalated LDH, the shift of the OH vibration band at 3346 cm−1 in