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Search for "coordination" in Full Text gives 231 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Fabrication of CeO2–MOx (M = Cu, Co, Ni) composite yolk–shell nanospheres with enhanced catalytic properties for CO oxidation

  • Ling Liu,
  • Jingjing Shi,
  • Hongxia Cao,
  • Ruiyu Wang and
  • Ziwu Liu

Beilstein J. Nanotechnol. 2017, 8, 2425–2437, doi:10.3762/bjnano.8.241

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  • general wet-chemical approach. It involved a non-equilibrium heat-treatment of Ce coordination polymer colloidal spheres (Ce-CPCSs) with a proper heating rate to produce CeO2 yolk–shell nanospheres, followed by a solvothermal treatment of as-synthesized CeO2 with M(CH3COO)2 in ethanol solution. During the
  • integration of coordination chemistry with anti-solvent effects for synchronized precipitation. Second, the resultant Ce-CPCSs served as the precursor to produce CeO2 yolk–shell nanospheres by non-equilibrium heat treatment with a proper heating rate. Heterogeneous contraction, caused by non-equilibrium heat
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Published 16 Nov 2017

Dissociative electron attachment to coordination complexes of chromium: chromium(0) hexacarbonyl and benzene-chromium(0) tricarbonyl

  • Janina Kopyra,
  • Paulina Maciejewska and
  • Jelena Maljković

Beilstein J. Nanotechnol. 2017, 8, 2257–2263, doi:10.3762/bjnano.8.225

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  • [9], and HFeCo3(CO)12 [33], the bare metal ions were either not observed or observed with very low intensity (below 0.5% of the most intense anionic fragment). Conclusion In the present contribution, we have investigated how different ligands within coordination complexes modify the formation of
  • , besides the direct decomposition of TNI, may also be generated via sequential, metastable decay. In the framework of the potential role of coordination complexes of chromium for FEBID applications, we note that the removal of C6H6 and all CO ligands to form exceptionally intense signal of bare [Cr]− has
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Published 30 Oct 2017

The interplay between spin densities and magnetic superexchange interactions: case studies of mono- and trinuclear bis(oxamato)-type complexes

  • Azar Aliabadi,
  • Bernd Büchner,
  • Vladislav Kataev and
  • Tobias Rüffer

Beilstein J. Nanotechnol. 2017, 8, 2245–2256, doi:10.3762/bjnano.8.224

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  • double resonance; spin density distribution; Introduction The flexibility of carbon chemistry together with the structural variety of coordination chemistry offers unique possibilities to design new coordination complexes. This includes the potential of metalloligands for a metallosupramolecular
  • related higher nuclear magnetic materials. There are already reports of spin and electron density distribution studies by polarized neutron and high-resolution X-ray diffraction measurements, respectively, for a ferrimagnetic type-IV coordination polymer [30][31]. Both studies revealed formidable direct
  • shown to be sufficient for this purpose [9], since at Q- and especially at W-band frequencies the powder pattern of the ESR spectrum arising due to the g-factor anisotropy is much better resolved. We demonstrated that the higher the tetrahedral distortion of the CuN2O4 coordination units of type-II
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Published 27 Oct 2017

Au55, a stable glassy cluster: results of ab initio calculations

  • Dieter Vollath,
  • David Holec and
  • Franz Dieter Fischer

Beilstein J. Nanotechnol. 2017, 8, 2221–2229, doi:10.3762/bjnano.8.222

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  • thermodynamically most stable structure is not crystalline, but it is glassy. The non-crystalline structure of this cluster was validated by comparison of the coordination numbers with those of a crystalline cluster. It was found that, in contrast to bulk materials, glass formation is connected to an energy release
  • shells [1][4]. On average, these clusters are composed of 13 atoms in the center and 42 atoms in the outer shell. From the atoms in the outer shell, 18 atoms are bond to the ligands [1]. Furthermore, these shells show a very broad scattering of the coordination numbers [4]. This fact was taken as an
  • al. [7], described the shape of the Au55 cluster as cuboctahedral. It must be mentioned that there are also findings, especially related to the coordination numbers, that the Au55 cluster is possibly structurally close to the face-centered cubic (fcc) structure [8][9][10]. Baletto and Ferrando prefer
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Published 25 Oct 2017

Ta2N3 nanocrystals grown in Al2O3 thin layers

  • Krešimir Salamon,
  • Maja Buljan,
  • Iva Šarić,
  • Mladen Petravić and
  • Sigrid Bernstorff

Beilstein J. Nanotechnol. 2017, 8, 2162–2170, doi:10.3762/bjnano.8.215

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  • understood through the influence of the Al2O3 component on the coordination and mobility of the tantalum atoms. Indeed, the tantalum nearest-neighbour distance in the as-grown films is relatively large, even 20% larger than that found in the amorphous Ta–N films obtained under high nitrogen fraction in
  • sputtering gas mixture [16]. Such coordination of tantalum atoms presumably leads to the formation of a tantalum nitride phase with a lower density. It is important to note that the diffraction patterns for both MLs annealed at 900 °C are in fact the superposition of diffraction peaks and a broad maximum
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Published 16 Oct 2017

Ester formation at the liquid–solid interface

  • Nguyen T. N. Ha,
  • Thiruvancheril G. Gopakumar,
  • Nguyen D. C. Yen,
  • Carola Mende,
  • Lars Smykalla,
  • Maik Schlesinger,
  • Roy Buschbeck,
  • Tobias Rüffer,
  • Heinrich Lang,
  • Michael Mehring and
  • Michael Hietschold

Beilstein J. Nanotechnol. 2017, 8, 2139–2150, doi:10.3762/bjnano.8.213

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  • Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India Inorganic Chemistry, Institute of Chemistry, Technische Universität Chemnitz, D-09107 Chemnitz, Germany, Coordination Chemistry, Institute of Chemistry, Technische Universität Chemnitz, D-09107 Chemnitz, Germany 10.3762
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Published 12 Oct 2017

Systematic control of α-Fe2O3 crystal growth direction for improved electrochemical performance of lithium-ion battery anodes

  • Nan Shen,
  • Miriam Keppeler,
  • Barbara Stiaszny,
  • Holger Hain,
  • Filippo Maglia and
  • Madhavi Srinivasan

Beilstein J. Nanotechnol. 2017, 8, 2032–2044, doi:10.3762/bjnano.8.204

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  • released into solution. Since it is understood that this coordination will specifically take place on the α-Fe2O3 surface facets with only singly coordinated hydroxyl groups, this interaction mechanism can be applied to direct the crystal growth in a specific growth direction. It was found that 1,2
  • verified by results of our test series. Diamines are typical chelate ligands that interact with appropriate coordination centers. First, octahedral-shaped complexes are formed [29], formally described as (Fe[C2H2N2R1R2]3)3+. Diamine derivatives, in which the two amine groups are located at adjacent C atoms
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Published 28 Sep 2017

Imidazolium-based ionic liquids used as additives in the nanolubrication of silicon surfaces

  • Patrícia M. Amorim,
  • Ana M. Ferraria,
  • Rogério Colaço,
  • Luís C. Branco and
  • Benilde Saramago

Beilstein J. Nanotechnol. 2017, 8, 1961–1971, doi:10.3762/bjnano.8.197

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  • , it mainly hydrated the substrate surface. However, in both cases, ambient humidity was found to disturb the ion-pair coordination, which resulted in an increase in friction [31]. Tests carried out at macroscale showed the same effect when using hydrophobic imidazolium-based ILs to lubricate silica
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Published 20 Sep 2017

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

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  • by the inelastic mean free path of the electrons and by the transmission function of the spectrometer analyser. The C 1s spectra are characterized by an intense peak associated to the C–C bond in sp2 coordination (located at 284.5 eV). For the functionalized samples, a shoulder appears at about 286
  • eV accounting for an increased contribution of the C–C bond in sp3 coordination and for C atom first neighbour of fluorinated carbon atoms (as C–CF). In addition, new peaks emerge in the energy range going from 288 to 294 eV due to the covalent C–F bond formation, with contributions from covalent C–F
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Published 21 Aug 2017

Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands

  • Martin Börner,
  • Laura Blömer,
  • Marcus Kischel,
  • Peter Richter,
  • Georgeta Salvan,
  • Dietrich R. T. Zahn,
  • Pablo F. Siles,
  • Maria E. N. Fuentes,
  • Carlos C. B. Bufon,
  • Daniel Grimm,
  • Oliver G. Schmidt,
  • Daniel Breite,
  • Bernd Abel and
  • Berthold Kersting

Beilstein J. Nanotechnol. 2017, 8, 1375–1387, doi:10.3762/bjnano.8.139

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  • , prevent the packing and self-assembly of the hydrocarbon chains. The smaller film thickness of 7 is attributed to the specific coordination mode of the coligand. Results of preliminary transport measurements utilizing rolled-up devices are also reported. Keywords: ambidentate ligands; chemisorption; gold
  • , typical for an octahedral NiN3S2O carboxylate chromophore (assigned as ν2(3A2g→3T2g) and ν1(3A2g→3T1g), respectively, in pure Oh symmetry). Infrared spectroscopy (IR) is also a powerful method to examine carboxylate coordination modes [47][48]. As can be seen (Table 1), the present complexes reveal two
  • (“gauche” conformation) most likely due to steric constraints exerted by the surrounding NMe groups. We have observed similar effects in an azido-bridged complex, where the surrounding alkyl groups dictate the coordination mode of the azido ligand [49]. Figure 3 provides a ball and stick and a van der
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Published 05 Jul 2017

Synthesis of [Fe(Leq)(Lax)]n coordination polymer nanoparticles using blockcopolymer micelles

  • Christoph Göbel,
  • Ottokar Klimm,
  • Florian Puchtler,
  • Sabine Rosenfeldt,
  • Stephan Förster and
  • Birgit Weber

Beilstein J. Nanotechnol. 2017, 8, 1318–1327, doi:10.3762/bjnano.8.133

Graphical Abstract
  • temperature. Applications demand compounds with defined properties concerning the size and switchability that are maintained when the compound is integrated into composite materials. Here, we report the synthesis of [Fe(Leq)(Lax)]n coordination polymer (CP) nanoparticles using self-assembled polystyrene-block
  • (bpea)]n@BCP while pronounced differences are observed in the case of [FeLeq(bpey)]n@BCP nanoparticles. Keywords: block copolymer; composite; nanoparticles; self-assembly; spin crossover; Introduction Nanomaterials and especially nanocomposites of coordination polymers (CPs) and (porous) coordination
  • (mostly magnetite) [12]. For coordination polymers (CP) or networks a limited amount of methods are applicable because of the very demanding reaction conditions and/or incompatible reactants. Recently we demonstrated that the use of block copolymers (BCPs) is a highly promising and easy approach for the
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Published 26 Jun 2017

Atomic structure of Mg-based metallic glass investigated with neutron diffraction, reverse Monte Carlo modeling and electron microscopy

  • Rafał Babilas,
  • Dariusz Łukowiec and
  • Laszlo Temleitner

Beilstein J. Nanotechnol. 2017, 8, 1174–1182, doi:10.3762/bjnano.8.119

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  • pair correlation functions and coordination numbers, which illustrated some types of cluster packing. The N = 9 clusters correspond to the tri-capped trigonal prisms, which are one of Bernal’s canonical clusters, and atomic clusters with N = 6 and N = 12 are suitable for octahedral and icosahedral
  • separation in the studied glass after heat treatment. The HAADF mode allows for the observation of randomly distributed, dark contrast regions of about 4–6 nm. The interplanar spacing identified for the orthorhombic Mg2Cu crystalline phase is similar to the value of the first coordination shell radius from
  • coordination shell. The R can be calculated by using following formula λ/2sinθ*, where 2θ* is the scatter angle at the halo maximum and λ is the wavelength [25]. The value of R = 0.242 nm can be compared with the atomic radii of the Mg, Cu, Y and Ni elements, which is 0.160, 0.128, 0.180 and 0.124 nm
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Published 31 May 2017

Preparation of thick silica coatings on carbon fibers with fine-structured silica nanotubes induced by a self-assembly process

  • Benjamin Baumgärtner,
  • Hendrik Möller,
  • Thomas Neumann and
  • Dirk Volkmer

Beilstein J. Nanotechnol. 2017, 8, 1145–1155, doi:10.3762/bjnano.8.116

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  • ], or by introducing acidic and basic additives that can interact with LPEI [22] and other proton donors [23]. Further modification of the silica morphology can be achieved by adding metal ions that form complexes with the secondary amine groups of LPEI [24][25][26]. The coordination interactions
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Published 26 May 2017

Structural properties and thermal stability of cobalt- and chromium-doped α-MnO2 nanorods

  • Romana Cerc Korošec,
  • Polona Umek,
  • Alexandre Gloter,
  • Jana Padežnik Gomilšek and
  • Peter Bukovec

Beilstein J. Nanotechnol. 2017, 8, 1032–1042, doi:10.3762/bjnano.8.104

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  • is 3+ as in Cr2O3 [29]. The spectra of the samples at the same edge are very similar, showing no major changes of metal coordination during the heating. There is a slight shift of the Mn and Co edges in the Co-90 sample toward lower energies, i.e., to a smaller oxidation number. In the spectrum of Cr
  • simultaneous fits of all spectra of the same ion. In the three final models, the number of oxygen neighbors was set to 6 in all cases. For all spectra in the model, we used the same values for the energy shift E0, the amplitude parameter S02, path lengths ri and coordination numbers Ni of manganese neighbors
  • metal oxidation states. As already mentioned, doping of the α-MnO2 structure can take place either in the Mn–O framework where dopant ions substitute manganese ions, or in the tunnels where they substitute potassium cations. This depends on the ionic radii of the dopant ions and their coordination [14
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Published 10 May 2017

Study of the correlation between sensing performance and surface morphology of inkjet-printed aqueous graphene-based chemiresistors for NO2 detection

  • F. Villani,
  • C. Schiattarella,
  • T. Polichetti,
  • R. Di Capua,
  • F. Loffredo,
  • B. Alfano,
  • M. L. Miglietta,
  • E. Massera,
  • L. Verdoliva and
  • G. Di Francia

Beilstein J. Nanotechnol. 2017, 8, 1023–1031, doi:10.3762/bjnano.8.103

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  • the case of graphene the active sites are represented by sp2 carbon atoms (low interaction energy) and defects such as vacancies, dangling bonds, coordination defects and functionalizations (high interaction energy). In the specific case of our LPE graphene, defects are mostly ascribed to edge defects
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Published 09 May 2017

Tuning the spin coherence time of Cu(II)−(bis)oxamato and Cu(II)−(bis)oxamidato complexes by advanced ESR pulse protocols

  • Ruslan Zaripov,
  • Evgeniya Vavilova,
  • Iskander Khairuzhdinov,
  • Kev Salikhov,
  • Violeta Voronkova,
  • Mohammad A. Abdulmalic,
  • Francois E. Meva,
  • Saddam Weheabby,
  • Tobias Rüffer,
  • Bernd Büchner and
  • Vladislav Kataev

Beilstein J. Nanotechnol. 2017, 8, 943–955, doi:10.3762/bjnano.8.96

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  • some of us [10][28]. Due to the coordination of two deprotonated amido nitrogen atoms and two carboxylate oxygen atoms for P1 the formation of a CuO2N2 coordination unit was observed [28], cf. Figure 1. It is to note, that not only the CuO2N2 unit but the whole complex fragment P1 was observed as
  • as well [28]. For P2, due to the coordination of four deprotonated amino nitrogen atoms, the formation of a CuN4 coordination unit was observed [10], cf. Figure 1. Compared to P1, deviations from planarity of the CuN4 unit and of P2 are significantly larger [10]. Furthermore, P2 should be C1
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Published 27 Apr 2017

Bio-inspired micro-to-nanoporous polymers with tunable stiffness

  • Julia Syurik,
  • Ruth Schwaiger,
  • Prerna Sudera,
  • Stephan Weyand,
  • Siegbert Johnsen,
  • Gabriele Wiegand and
  • Hendrik Hölscher

Beilstein J. Nanotechnol. 2017, 8, 906–914, doi:10.3762/bjnano.8.92

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  • ImageJ plugin [24]. During the analysis, each pore was fitted with a sphere with the centre coordinates (X, Y) and radius R. The mean thickness of the polymer wall between the pore of interest I and the N closest pores is defined as Based on the SEM images the coordination number N was chosen to be
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Published 21 Apr 2017

Probing the magnetic superexchange couplings between terminal CuII ions in heterotrinuclear bis(oxamidato) type complexes

  • Mohammad A. Abdulmalic,
  • Saddam Weheabby,
  • Francois E. Meva,
  • Azar Aliabadi,
  • Vladislav Kataev,
  • Bernd Büchner,
  • Frederik Schleife,
  • Berthold Kersting and
  • Tobias Rüffer

Beilstein J. Nanotechnol. 2017, 8, 789–800, doi:10.3762/bjnano.8.82

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  • form a planar-quadratic NiN4 coordination environment. Two of them belong to the N,N’-o-phenylene bridges of 1A–3A (1A/2A: N1 and N3. 3A: N1 and N1A) and are referred to in the following as Naryl donor atoms. The other two belong to the alkyl-substituted amide functions of 1A–3A (1A/2A: N2 and N4. 3A
  • -containing bis(oxamato) complex [n-Bu4N]2[Ni(opba)] (11) [23] and the related bis(oxamidato) type complex [Ph4P]2[Ni(opboMe2)] (12) [9] the following observation has been made: Three of bond angles of the central NiN2O2/NiN4 coordination units are small (11: 85.79(8)–86.18(5)°; 12: 82.7(3)–84.7(3)°), while
  • complexes as described in [15]. Thus, the terminal CuII ions of 1A–3A are each coordinated by two O donor atoms of the oxamidato groups as well as three N donor atoms of the pmdta ligands to form CuN3O2 coordination units closer to the ideal square-pyramidal compared to the ideal trigonal-bipyramidal
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Published 06 Apr 2017

Tailoring bifunctional hybrid organic–inorganic nanoadsorbents by the choice of functional layer composition probed by adsorption of Cu2+ ions

  • Veronika V. Tomina,
  • Inna V. Melnyk,
  • Yuriy L. Zub,
  • Aivaras Kareiva,
  • Miroslava Vaclavikova,
  • Gulaim A. Seisenbaeva and
  • Vadim G. Kessler

Beilstein J. Nanotechnol. 2017, 8, 334–347, doi:10.3762/bjnano.8.36

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  • were further investigated by electron paramagnetic resonance (EPR) and electron spectroscopy of diffuse reflectance (ESDR) spectroscopy using Cu2+ ion coordination as a probe. The composition and structure of the emerging surface complexes were determined and used to provide an insight into the
  • are available for H+ sorption. The intrinsic structure and reactivity of the aminopropyl groups were investigated using Cu2+ adsorption. In the view that EPR spectra of the copper(II) complexes provide direct insight into the coordination of these cations, they were thus revealing the spatial
  • adsorption isotherms are presented in Figure 5. To determine the formal coordination surrounding of Cu(II) ions in the adsorption layer, the isotherms were plotted in the form of CsCu:CsR as a function of C0Cu:C0R (Figure 6, Figure S8, Supporting Information File 1). These data were complemented by EPR and
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Published 02 Feb 2017

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

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  • light scattering. The parameters were varied within each route to fine tune the size and shape of the formed nanoparticles. Keywords: iron coordination compounds; mixed oxide nanoparticles; morphology control; nanoparticle shape control; optimization procedure; Introduction The iron oxide-based
  • ]. As precursors for obtaining iron oxides or mixed oxides thereof with other metals, their salts are most often used. In recent years, particular attention was paid to the use of coordination compounds as precursors, since they offer a number of advantages such as increased solubility, and better
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Published 28 Dec 2016

Effect of Anderson localization on light emission from gold nanoparticle aggregates

  • Mohamed H. Abdellatif,
  • Marco Salerno,
  • Gaser N. Abdelrasoul,
  • Ioannis Liakos,
  • Alice Scarpellini,
  • Sergio Marras and
  • Alberto Diaspro

Beilstein J. Nanotechnol. 2016, 7, 2013–2022, doi:10.3762/bjnano.7.192

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  • difference for the 4f7/2 core level of 0.06 eV, and for the core level 4f5/2 of 0.14 eV. These differences are attributed to the different coordination number induced by the geometrical factors of the aggregates [17], i.e., their likely different aggregation density. The geometrical factors determine the
  • excitation at 300 nm wavelength. Figure 2a shows that the samples differ only in the aggregation pattern and mass, in which the coordination number and geometry are supposed to be the main difference, which is confirmed by the shift in the XPS data in Figure 1. In Figure 3, the PL spectra of the AuNPs in all
  • localization. Different substrates are found to induce different aggregation density and coordination number, which is confirmed from the shift in the XPS data. The difference in aggregation induces changes in the dephasing time, linewidth and particle plasmon resonance position. The AuNPs on quartz show a
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Published 16 Dec 2016

Facile fabrication of luminescent organic dots by thermolysis of citric acid in urea melt, and their use for cell staining and polyelectrolyte microcapsule labelling

  • Nadezhda M. Zholobak,
  • Anton L. Popov,
  • Alexander B. Shcherbakov,
  • Nelly R. Popova,
  • Mykhailo M. Guzyk,
  • Valeriy P. Antonovich,
  • Alla V. Yegorova,
  • Yuliya V. Scrypynets,
  • Inna I. Leonenko,
  • Alexander Ye. Baranchikov and
  • Vladimir K. Ivanov

Beilstein J. Nanotechnol. 2016, 7, 1905–1917, doi:10.3762/bjnano.7.182

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  • urea thermolysis. Thus, the resulting O-dot is a set of primary fluorophores bound by covalent or intermolecular (coordination, donor–acceptor, hydrogen) bonds, for example, forming a polymer-like structure [47], so that the particles formed can be identified as clusters of independent fluorophores [19
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Published 02 Dec 2016

In situ formation of reduced graphene oxide structures in ceria by combined sol–gel and solvothermal processing

  • Jingxia Yang,
  • Johannes Ofner,
  • Bernhard Lendl and
  • Ulrich Schubert

Beilstein J. Nanotechnol. 2016, 7, 1815–1821, doi:10.3762/bjnano.7.174

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  • that part of the defects were repaired and rGO was formed. Compared with the COO groups of GO (Figure 3b), the positions of C=O bands shifted from 1719 cm−1 to 1492 cm−1. The shifts are most likely caused by coordination of graphene to CeO2 through the residual COO groups. The IR spectrum of the sample
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Published 23 Nov 2016

Microwave synthesis of high-quality and uniform 4 nm ZnFe2O4 nanocrystals for application in energy storage and nanomagnetics

  • Christian Suchomski,
  • Ben Breitung,
  • Ralf Witte,
  • Michael Knapp,
  • Sondes Bauer,
  • Tilo Baumbach,
  • Christian Reitz and
  • Torsten Brezesinski

Beilstein J. Nanotechnol. 2016, 7, 1350–1360, doi:10.3762/bjnano.7.126

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  • coordination sites are randomly occupied in a 1:1 ratio by the A and B cations and the tetrahedral sites are only occupied by the B cations in inverse spinels (λ = 1). In both cases, the O2− ions form a cubic close-packed structure and reside on 32e sites. However, nanoscale spinel ferrites prepared by wet
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Published 27 Sep 2016

On the pathway of cellular uptake: new insight into the interaction between the cell membrane and very small nanoparticles

  • Claudia Messerschmidt,
  • Daniel Hofmann,
  • Anja Kroeger,
  • Katharina Landfester,
  • Volker Mailänder and
  • Ingo Lieberwirth

Beilstein J. Nanotechnol. 2016, 7, 1296–1311, doi:10.3762/bjnano.7.121

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Published 16 Sep 2016
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