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

• hybrid compounds. The main band assignations are gathered in Table 3. As expected, all the FTIR spectra of the prepared compounds (Figure 4) exhibit the LDH characteristic bands [46] in particular those at 3700–3200 and 1647 cm−1 attributed to the stretching vibration of OH groups in the LDH layers and

• the stretching and bending mode of the water molecules, respectively. In the low wavenumber region, the bands at 783, 651, 558 and 453 cm−1 can be attributed to the O–M–O and M–O vibration bands in the brucite-like layers. MacroRAFT (co)polymer intercalation was further confirmed by FTIR due to the

• 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

Organoclay hybrid materials as precursors of porous ZnO/silica-clay heterostructures for photocatalytic applications

• Marwa Akkari,
• Pilar Aranda,
• Abdessalem Ben Haj Amara and
• Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1971–1982, doi:10.3762/bjnano.7.188

• bands are typical for the νC–H stretching and δCH2 deformation vibration modes of –CH2– and CH3– groups belonging to the CTA+ ions, respectively. After the thermal treatment, these bands completely disappear from the infrared spectrum corroborating the whole removal of the organic species by calcination

• in accordance also with results from thermogravimetric curves (data not shown). The bands in the 950–1200 cm−1 region correspond to the νSi–O stretching vibration modes of the clay, typically appearing as an intense band centered in the range of 1020–1050 cm−1 with a shoulder around 1100 cm−1. In the

• samples containing SiO2 the shoulder shifts to higher wavenumbers and even a second shoulder is observable in the 1180–1200 cm−1 range, as the bands ascribed to vibration modes of the silica network overlap those of the clay substrate, as it was also observed in other SiO2-clay nanocomposites [11]. FE-SEM

Controlled supramolecular structure of guanosine monophosphate in the interlayer space of layered double hydroxide

• Gyeong-Hyeon Gwak,
• Istvan Kocsis,
• Yves-Marie Legrand,
• Mihail Barboiu and
• Jae-Min Oh

Beilstein J. Nanotechnol. 2016, 7, 1928–1935, doi:10.3762/bjnano.7.184

• ) shows typical vibrational modes at 1695, 1605, 1535, and 1365 cm−1, which were attributed to C=O, C=N, pyrimidine/imidazole and imidazole vibration, respectively. Two bands at 1080 and 980 cm−1 resulted from PO32− antisymmetric stretching and PO32− symmetric stretching [19]. Both GL-S (Figure 6a, line c

Chitosan-based nanoparticles for improved anticancer efficacy and bioavailability of mifepristone

• Huijuan Zhang,
• Fuqiang Wu,
• Yazhen Li,
• Xiping Yang,
• Jiamei Huang,
• Tingting Lv,
• Yingying Zhang,
• Jianzhong Chen,
• Haijun Chen,
• Yu Gao,
• Guannan Liu and
• Lee Jia

Beilstein J. Nanotechnol. 2016, 7, 1861–1870, doi:10.3762/bjnano.7.178

• due to P–O stretching vibration. The MCNs formulation showed the characteristic absorption peaks of both MIF and CNs, which proved that MIF was successfully wrapped in Cs nanoparticles. X-ray diffraction (XRD) analysis The XRD patterns were studied to observe the change in crystallinity of the MIF in

Effective intercalation of zein into Na-montmorillonite: role of the protein components and use of the developed biointerfaces

• Ana C. S. Alcântara,
• Margarita Darder,
• Pilar Aranda and
• Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1772–1782, doi:10.3762/bjnano.7.170

• biohybrids which contain 9.25, 26.2 and 46.6 g of protein per 100 g of MMT, respectively, are shown in Figure 3. The IR bands at 3634, 1648 and 1045 cm−1 are assigned to νOH modes of Al,Mg(OH) and δHOH modes of water molecules in the clay and characteristic νSi–O–Si vibration modes of the aluminosilicate

• , respectively (Figure 3a). Other bands that can be attributed to the intercalated protein are also observed in the spectra of the biohybrids. The frequency of the band corresponding to the νCO vibration mode of amide I that appears at 1658 cm−1 in pristine zein (Figure 3e) is shifted toward higher frequency

• changes in the amide-I band of zein were reported by Ozcalik and Tihminlioglu [37] in bionanocomposites based on organomodified montmorillonite. The band ascribed to the νNH vibration mode of the amide-A groups in zein also appears at higher wavenumber in the biohybrids, where the frequency depends on the

Surface-enhanced infrared absorption studies towards a new optical biosensor

• Lothar Leidner,
• Julia Stäb,
• Jennifer T. Adam and
• Günter Gauglitz

Beilstein J. Nanotechnol. 2016, 7, 1736–1742, doi:10.3762/bjnano.7.166

• -enhanced infrared absorption (SEIRA). This is demonstrated using the broad complex fluid water band at 3300 cm−1, which is caused by superposition of symmetric, antisymmetric stretching vibration, and the first overtone of the bending vibration under the influence of H-bonds and Fermi resonance effect. The

• between 3500 and 3800 cm−1 (rotation–vibration spectra of water vapor in air). There is an obvious baseline shift which is small for nanoparticles and strong after aggregation. The reason could be that the aggregated particles are larger and therefore scatter a larger amount of light into the direction of

• addition of Ag nanoparticles, there is a shift of the absorption maximum to 3260 cm−1. The absorption features converge to the absorption spectra of ice (see Figure 3). Looking at the spectra of Mizaikoff et al. [13], there seems to be a similar shift of the vibration spectrum to lower wavenumbers. However

Role of RGO support and irradiation source on the photocatalytic activity of CdS–ZnO semiconductor nanostructures

• Suneel Kumar,
• Rahul Sharma,
• Vipul Sharma,
• Gurunarayanan Harith,
• Vaidyanathan Sivakumar and
• Venkata Krishnan

Beilstein J. Nanotechnol. 2016, 7, 1684–1697, doi:10.3762/bjnano.7.161

• of CdS NP also reveal the presence of O–H stretching vibrations of adsorbed water molecules on its surface. The peak at 1550 cm−1 is attributed to the C–N stretching vibration of the PVP monomer, which was used as capping agent [53]. The 1404 cm−1 peak corresponds to the C–H bond of PVP [54]. CdS–ZnO

Nanoanalytics for materials science

• Thilo Glatzel and
• Tom Wirtz

Beilstein J. Nanotechnol. 2016, 7, 1674–1675, doi:10.3762/bjnano.7.159

• co-workers [6]. Finally, Mirzaei and Kiani described the vibration behavior of carbon-nanotube-reinforced composite structures highlighting the importance but also the feasibility of theoretical approaches in complex nanoanalytical studies [7]. Finally, we want to express our thanks to all authors

Fracture behaviors of pre-cracked monolayer molybdenum disulfide: A molecular dynamics study

• Qi-lin Xiong,
• Zhen-huan Li and
• Xiao-geng Tian

Beilstein J. Nanotechnol. 2016, 7, 1411–1420, doi:10.3762/bjnano.7.132

• and Vibration, Xi’an Jiaotong University, Xi’an 710049, China 10.3762/bjnano.7.132 Abstract The fracture strength and crack propagation of monolayer molybdenum disulfide (MoS2) sheets with various pre-existing cracks are investigated using molecular dynamics simulation (MDS). The uniaxial tensions of

High performance Ce-doped ZnO nanorods for sunlight-driven photocatalysis

• Bilel Chouchene,
• Tahar Ben Chaabane,
• Lavinia Balan,
• Emilien Girot,
• Kevin Mozet,
• Ghouti Medjahdi and
• Raphaël Schneider

Beilstein J. Nanotechnol. 2016, 7, 1338–1349, doi:10.3762/bjnano.7.125

• (high) vibration modes of wurtzite ZnO with P63mc symmetry [49]. In the spectra of ZnO:Ce (5, 7 and 10% doping) materials, the signal observed at 457 cm−1 originates from the Raman active mode characteristic of CeO2 fluorite-structured materials with F2g symmetry and corresponds to the ceria Ce-O8

Ammonia gas sensors based on In₂O₃/PANI hetero-nanofibers operating at room temperature

• Qingxin Nie,
• Zengyuan Pang,
• Hangyi Lu,
• Yibing Cai and
• Qufu Wei

Beilstein J. Nanotechnol. 2016, 7, 1312–1321, doi:10.3762/bjnano.7.122

• stretching vibration. It could be the result of absorbing moisture from air. The –CH2 stretching vibration and bending vibration of PVP are attributed to the peaks of around 2951 cm−1 and 1423 cm−1. The peaks at 1647 cm−1 and 1292 cm−1 were assigned to the C=O stretching vibration and C≡N antisymmetrical

• stretching vibration, respectively, in the ring skeleton of PVP. But the characteristic peaks of In(NO3)3 could not be found in the FTIR spectra. In the spectrum of In2O3 nanofibers (Figure 2c), the characteristic peaks of PVP have almost vanished. Instead, peaks around 600 cm−1, 567 cm−1 and 538 cm−1

• originating from C=C stretching vibration in the quinoid ring of PANI can be seen. The characteristic bands of 1300 cm−1 and 1116 cm−1 were attributed to the C–N stretching vibration in the benzenoid ring and the bending vibration plane of C–H bonds in the quinoid ring, respectively. By comparison, the

Improved lithium-ion battery anode capacity with a network of easily fabricated spindle-like carbon nanofibers

• Mengting Liu,
• Wenhe Xie,
• Lili Gu,
• Tianfeng Qin,
• Xiaoyi Hou and
• Deyan He

Beilstein J. Nanotechnol. 2016, 7, 1289–1295, doi:10.3762/bjnano.7.120

• vibration [4][8]. The other two peaks at about 1366 and 1592 cm−1 correspond to the D-band and G-band of disordered carbon and graphitic carbon, respectively. The higher intensity of the D-band means that the amorphous carbon has more defects and can offer more lithium storage sites [8][26]. It also reveals

Reasons and remedies for the agglomeration of multilayered graphene and carbon nanotubes in polymers

• Rasheed Atif and
• Fawad Inam

Beilstein J. Nanotechnol. 2016, 7, 1174–1196, doi:10.3762/bjnano.7.109

An ellipsometric approach towards the description of inhomogeneous polymer-based Langmuir layers

• Falko O. Rottke,
• Burkhard Schulz,
• Klaus Richau,
• Karl Kratz and
• Andreas Lendlein

Beilstein J. Nanotechnol. 2016, 7, 1156–1165, doi:10.3762/bjnano.7.107

• barriers. The whole setup, including the ellipsometer, was placed on an active vibration isolation system (halcyonics variobasic 40, Accurion, Göttingen, Germany) and covered with a laser safety cabinet, which also prevented dust from entering the experiment. Before each experiment, the Langmuir trough and

Signal enhancement in cantilever magnetometry based on a co-resonantly coupled sensor

• Julia Körner,
• Christopher F. Reiche,
• Thomas Gemming,
• Bernd Büchner,
• Gerald Gerlach and
• Thomas Mühl

Beilstein J. Nanotechnol. 2016, 7, 1033–1043, doi:10.3762/bjnano.7.96

• resonance frequencies by employing a custom-made vibration stage. When the resonance frequencies of the subsystem are approaching each other, the resonance frequencies of the coupled system do not coincide with them anymore, as discussed above. In order to still measure the single resonance frequency of

Sandwich-like layer-by-layer assembly of gold nanoparticles with tunable SERS properties

• Zhicheng Liu,
• Lu Bai,
• Guizhe Zhao and
• Yaqing Liu

Beilstein J. Nanotechnol. 2016, 7, 1028–1032, doi:10.3762/bjnano.7.95

• signatures [24]. Figure 3a shows the SERS spectra of the corresponding multilayer thin films. It is noted that the spectra are dominated by the a1 vibration modes, which show distinct peaks at 1587 cm−1 (νC–C) and 1078 c−1 (νC–S). It suggests that the electromagnetic field enhancement dominates the SERS

A terahertz-vibration to terahertz-radiation converter based on gold nanoobjects: a feasibility study

• Kamil Moldosanov and
• Andrei Postnikov

Beilstein J. Nanotechnol. 2016, 7, 983–989, doi:10.3762/bjnano.7.90

• following relation holds: whence the angle that defines the propagation direction of the excited electron reads: where . By expressing momentum and energy quanta of the the vibration mode, q and ΔEvm, respectively, in terms of the length of path along which the compression waves propagate, L, and the

• separated (at ca. 2.4 and ca. 4.2 THz, respectively), as it was discussed by Bayle et al. [3] (see Figure 2). Credible numerical simulations comply quite well, even quantitatively, with such a neat separation of the vibration spectrum of gold into two peaks, in what concerns nanoparticles [9] as well as the

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

• process on graphene. The energy difference between 0–0, 0–1 and 0–2 sub-bands is preserved, at 0.18 eV. This value is characteristic of the π-conjugated C–C double bond vibration and shows that the absorption remains dominated by the π–π* transition. 2D ordered aggregation of similar molecules on metals

Efficient electron-induced removal of oxalate ions and formation of copper nanoparticles from copper(II) oxalate precursor layers

• Kai Rückriem,
• Sarah Grotheer,
• Henning Vieker,
• Paul Penner,
• André Beyer,
• Armin Gölzhäuser and
• Petra Swiderek

Beilstein J. Nanotechnol. 2016, 7, 852–861, doi:10.3762/bjnano.7.77

• in the range between 600 and 1800 cm−1, which can be assigned to characteristic vibrations of the oxalate anions. The broad band at 1620 cm−1 and the band at 830 cm−1 are uniquely assigned to the asymmetric CO2 stretching vibration (ν9, b2u in Herzberg notation [27]) and to the asymmetric CO2

• stretching vibration of CO2 [31]. The close agreement with the frequency of 2343 cm−1 reported for solid CO2 [32] indicates a physisorbed nature of the compound. As the samples were irradiated and handled at room temperature, CO2 must thus be trapped within the copper(II) oxalate crystal lattice. In

Templated green synthesis of plasmonic silver nanoparticles in onion epidermal cells suitable for surface-enhanced Raman and hyper-Raman scattering

• Marta Espina Palanco,
• Klaus Bo Mogensen,
• Marina Gühlke,
• Zsuzsanna Heiner,
• Janina Kneipp and
• Katrin Kneipp

Beilstein J. Nanotechnol. 2016, 7, 834–840, doi:10.3762/bjnano.7.75

• scattering experiments performed on onion cell layers exposed to HAuCl4 show a strong Raman line at 346 cm−1, which exists across the entire sample. This line can be assigned to an Au–Cl stretching vibration [33] and indicates the presence of a large amount of excess gold chloride. This suggests that

Microscopic characterization of Fe nanoparticles formed on SrTiO₃(001) and SrTiO₃(110) surfaces

• Miyoko Tanaka

Beilstein J. Nanotechnol. 2016, 7, 817–824, doi:10.3762/bjnano.7.73

• . Electrochemically etched tungsten tips were used. STM images are not highly resolved because vibration and sample drift cannot be completely eliminated due to the relatively non-rigid sample holders that need to be compatible to UTSICS and TEM. TEM images and TED patterns were taken with an acceleration voltage of

High-resolution noncontact AFM and Kelvin probe force microscopy investigations of self-assembled photovoltaic donor–acceptor dyads

• Benjamin Grévin,
• Pierre-Olivier Schwartz,
• Laure Biniek,
• Martin Brinkmann,
• Nicolas Leclerc,
• Elena Zaborova and
• Stéphane Méry

Beilstein J. Nanotechnol. 2016, 7, 799–808, doi:10.3762/bjnano.7.71

• Omicron VT-AFM setup under UHV at room temperature. For each image, the frequency shift, Δf, and vibration amplitude, AVib, are indicated in the corresponding figure caption. Silicon cantilevers (SuperSharpSilicon, Nanosensors, n+-doped, stiffness 40 N/m, resonance frequency in the 280–300 kHz range) were

Finite-size effect on the dynamic and sensing performances of graphene resonators: the role of edge stress

• Chang-Wan Kim,
• Mai Duc Dai and
• Kilho Eom

Beilstein J. Nanotechnol. 2016, 7, 685–696, doi:10.3762/bjnano.7.61

• behavior of graphene can be tuned not only through edge stress but also through nonlinear vibration, and that the detection sensitivity of a graphene resonator can be controlled by using the edge stress. Our study sheds light on the important role of the finite-size effect in the effective design of

• graphene resonators for their mass sensing applications. Keywords: edge stress; graphene resonator; mass sensing; nonlinear vibration; size effect; sensitivity; Introduction Recent advances in nanotechnology have allowed for the development of nano-electro-mechanical system (NEMS) devices that can

• stress has an impact on the dynamic and sensing performances of a graphene resonator. The effect of edge stress on the nonlinear vibration of a graphene resonator has not been studied, even though the graphene resonator can easily reach the nonlinear vibration regime due to the fact that the vibration

Free vibration of functionally graded carbon-nanotube-reinforced composite plates with cutout

• Mostafa Mirzaei and
• Yaser Kiani

Beilstein J. Nanotechnol. 2016, 7, 511–523, doi:10.3762/bjnano.7.45

• exceptional reinforcement for composites. For this reason, a large number of investigations have been devoted to analysis of fundamental, structural behavior of solid structures made of carbon-nanotube-reinforced composites (CNTRC). The present research, as an extension of the available works on the vibration

• analysis of CNTRC structures, examines the free vibration characteristics of plates containing a cutout that are reinforced with uniform or nonuniform distribution of carbon nanotubes. The first-order shear deformation plate theory is used to estimate the kinematics of the plate. The solution method is

• FG-CNTRC structures. Zhu et al. [4] investigated the free vibration and static response of FG-CNTRC plates using finite element method [4]. Zhang et al. investigated the free vibration characteristics of FG-CNTRC skew plates [5], triangular plates [6] and cylindrical panels [7] using element free

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

• can be observed from Figure 5a that the fundamental optical mode vibrations are at 437 cm−1 and 583 cm−1 corresponding to the E2 mode and A1(LO) mode, respectively, in ZnO-TF [56][57]. The E2 mode is associated with the vibration of the heavy Zn sublattice of crystalline wurzite ZnO, and the A1(LO

• ) mode is associated with intrinsic lattice defects [58][59]. The Raman spectra of ZnO-NR in Figure 5c shows a shift in the A1(LO) mode vibration by 8 cm−1, indicating the possibility of a confinement effect [60]. The vibrational spectra of the hybrid structures (Figure 5b,d) shows characteristic peaks

• attributed to C–O–C asymmetric stretching, O–H bending, C=C stretching and C–H bending of the retinal chromophore, amino acids and lipids [66]. Further investigation indicates a small change in the amide I vibration spectra (at 1660 cm−1) due to the C=O stretch in the skeleton and amide II vibration spectra