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Search for "cobalt" in Full Text gives 183 result(s) in Beilstein Journal of Nanotechnology.

Block copolymers for designing nanostructured porous coatings

  • Roberto Nisticò

Beilstein J. Nanotechnol. 2018, 9, 2332–2344, doi:10.3762/bjnano.9.218

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  • leaving the PEO domains visible (and forming a porous structure). Analogous results were also obtained for cobalt onto PS-b-PEO [100]. Concerning the soft-templating route, usually the most diffuse porogens used are surfactants: small molecules characterized by having both polar (head) and apolar (tail
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Review
Published 29 Aug 2018

Metal-free catalysis based on nitrogen-doped carbon nanomaterials: a photoelectron spectroscopy point of view

  • Mattia Scardamaglia and
  • Carla Bittencourt

Beilstein J. Nanotechnol. 2018, 9, 2015–2031, doi:10.3762/bjnano.9.191

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  • the π-system of pyridinic N and graphene, as already reported for carbon nanofibers by Maldonado and Stevenson [102]. A more detailed study was performed by Kundu et al. [103] on N-CNTs prepared via pyrolysis of acetonitrile over cobalt catalysts. Samples were synthesized at different temperatures
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Published 18 Jul 2018

Synthesis of hafnium nanoparticles and hafnium nanoparticle films by gas condensation and energetic deposition

  • Irini Michelakaki,
  • Nikos Boukos,
  • Dimitrios A. Dragatogiannis,
  • Spyros Stathopoulos,
  • Costas A. Charitidis and
  • Dimitris Tsoukalas

Beilstein J. Nanotechnol. 2018, 9, 1868–1880, doi:10.3762/bjnano.9.179

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  • demonstrate high catalytic activity during hydrogenation of levulinic acid [17], nickel NPs, which find application as electrochemical sensor [18], and cobalt NPs, which exhibit high magnetic anisotropy [19]. Recently, we have reported that hcp hafnium nanoparticles fabricated by inert-gas condensation, when
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Published 27 Jun 2018

Uniform cobalt nanoparticles embedded in hexagonal mesoporous nanoplates as a magnetically separable, recyclable adsorbent

  • Can Zhao,
  • Yuexiao Song,
  • Tianyu Xiang,
  • Wenxiu Qu,
  • Shuo Lou,
  • Xiaohong Yin and
  • Feng Xin

Beilstein J. Nanotechnol. 2018, 9, 1770–1781, doi:10.3762/bjnano.9.168

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  • (LDH). A uniform PDA coating initially covers the surface of LDH by dopamine self-polymerization under mild conditions. Well-dispersed Co nanoparticles are formed in the NPLs by the partial reduction of cobalt from Co2+ to Co0 with surface carbon during the heat treatment process. The surface
  • in the carbon layer; and (iv) the obtained hexagonal magnetic mesoporous NPL displays a larger adsorption capacity towards removal of RhB from water than observed in other adsorbents [23][24][25][26][27][28][29][30]. Experimental Materials and chemicals Cobalt chloride hexahydrate, aluminum chloride
  • containing magnetic Co nanoparticles (CoAl2O4 phase) and porous carbon layer by partial reduction Co2+ ions in the lattice of LDH with carbon during carbonization process at 800 °C [15][34]. The Z-contrast image in HAADF-STEM image correlates strongly with the atomic mass. Metallic cobalt is a heavier
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Published 13 Jun 2018

Interaction-tailored organization of large-area colloidal assemblies

  • Silvia Rizzato,
  • Elisabetta Primiceri,
  • Anna Grazia Monteduro,
  • Adriano Colombelli,
  • Angelo Leo,
  • Maria Grazia Manera,
  • Roberto Rella and
  • Giuseppe Maruccio

Beilstein J. Nanotechnol. 2018, 9, 1582–1593, doi:10.3762/bjnano.9.150

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  • or L, indicating small or large spheres, respectively, upper index refers to the NaCl concentration, and the lower index indicates the particle concentration in wt %. After colloidal assembly of the polystyrene particles, gold and cobalt nanohole arrays (Figure 1b) were realized by depositing 20 nm
  • thick metal layers (gold films deposited by thermal evaporation and cobalt films deposited by magnetron sputtering) and successively removing the metal-capped spherical, nanoscale materials (termed “nanospheres” throughout the remainder of this article) by careful tape stripping with carbon tape in
  • properties of cobalt nanoholes were investigated by the magneto-optical Kerr effect technique in longitudinal configuration. The samples were placed between the poles of a GMW 3470 electromagnet, where the magnetic field intensity was measured by a Group3 Teslameter probe. A He–Ne laser beam (wavelength 633
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Published 29 May 2018

Chemistry for electron-induced nanofabrication

  • Petra Swiderek,
  • Hubertus Marbach and
  • Cornelis W. Hagen

Beilstein J. Nanotechnol. 2018, 9, 1317–1320, doi:10.3762/bjnano.9.124

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  • precursor, thus highlighting the importance of the actual chemical nature of the substrate [31]. This Thematic Series is completed by publications on interesting applications of FEBID. This concerns the fabrication and characterization of magnetic cobalt nanospheres on cantilever tips for magnetic resonance
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Published 30 Apr 2018
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  • differences in structure and conformation [15]. The submolecular structure of cobalt and copper phthalocyanines on gold substrates were resolved with STM by Lu et al. [16]. The differences in central metals were resolved for a mixed sample. The molecular orientation and molecular switching properties of a
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Published 17 Apr 2018

Magnetic characterization of cobalt nanowires and square nanorings fabricated by focused electron beam induced deposition

  • Federico Venturi,
  • Gian Carlo Gazzadi,
  • Amir H. Tavabi,
  • Alberto Rota,
  • Rafal E. Dunin-Borkowski and
  • Stefano Frabboni

Beilstein J. Nanotechnol. 2018, 9, 1040–1049, doi:10.3762/bjnano.9.97

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Published 03 Apr 2018

Towards the third dimension in direct electron beam writing of silver

  • Katja Höflich,
  • Jakub Mateusz Jurczyk,
  • Katarzyna Madajska,
  • Maximilian Götz,
  • Luisa Berger,
  • Carlos Guerra-Nuñez,
  • Caspar Haverkamp,
  • Iwona Szymanska and
  • Ivo Utke

Beilstein J. Nanotechnol. 2018, 9, 842–849, doi:10.3762/bjnano.9.78

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  • of the purity of Co–C nanopillars on the growth pressure in cobalt deposition and provided strong hints that indeed a small precursor flux can trigger higher purity but also broader geometrical features [29]. For applications in plasmonics elemental silver is crucial. Here, surface-enhanced Raman
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Published 08 Mar 2018

Heavy-metal detectors based on modified ferrite nanoparticles

  • Urszula Klekotka,
  • Ewelina Wińska,
  • Elżbieta Zambrzycka-Szelewa,
  • Dariusz Satuła and
  • Beata Kalska-Szostko

Beilstein J. Nanotechnol. 2018, 9, 762–770, doi:10.3762/bjnano.9.69

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  • Abstract In this work, we analyze artificial heavy-metal solutions with ferrite nanoparticles. Measurements of adsorption effectiveness of different kinds of particles, pure magnetite or magnetite doped with calcium, cobalt, manganese, or nickel ions, were carried out. A dependence of the adsorption
  • , for example such as linker concentration, heavy ions concentration, pH value, or inorganic core composition, and such studies are in progress and will be a subject of subsequent papers. Conclusion Ferrite nanoparticles doped with calcium, cobalt, nickel, or manganese show differences in ion adsorption
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Published 28 Feb 2018

A review of carbon-based and non-carbon-based catalyst supports for the selective catalytic reduction of nitric oxide

  • Shahreen Binti Izwan Anthonysamy,
  • Syahidah Binti Afandi,
  • Mehrnoush Khavarian and
  • Abdul Rahman Bin Mohamed

Beilstein J. Nanotechnol. 2018, 9, 740–761, doi:10.3762/bjnano.9.68

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  • prepared using the sol–gel method had better catalytic activity than that of the impregnation method. Besides that, a huge amount of oxygen vacancies and superoxide ions was observed when cobalt metal was introduced via the sol–gel method, thereby enhancing the SCR performance. On the other hand, the co
  • loading Zn- (Fe-, Ni-, Cu- or Ag-) promoted Co/Al2O3 catalyst to study the effect of additive metals on the SCR of NO. From the experimental studies, it was found that this technique definitely contributes towards a good homogeneous dispersion and helps prevent aggregation of highly deposited cobalt on
  • alumina. Moreover, a uniform morphology of the catalyst was obtained and small-sized deposited cobalt was sustained under the presence of Fe, Ni, Cu, Zn or Ag. Meanwhile, Sun et al. [46] planned to enhance the performance of MnOx catalyst for the SCR-NH3 of NO reaction by modifying it with Eu using the co
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Review
Published 27 Feb 2018

Electron interactions with the heteronuclear carbonyl precursor H2FeRu3(CO)13 and comparison with HFeCo3(CO)12: from fundamental gas phase and surface science studies to focused electron beam induced deposition

  • Ragesh Kumar T P,
  • Paul Weirich,
  • Lukas Hrachowina,
  • Marc Hanefeld,
  • Ragnar Bjornsson,
  • Helgi Rafn Hrodmarsson,
  • Sven Barth,
  • D. Howard Fairbrother,
  • Michael Huth and
  • Oddur Ingólfsson

Beilstein J. Nanotechnol. 2018, 9, 555–579, doi:10.3762/bjnano.9.53

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  • framework of the metal atoms of these heterometallic clusters. In H2FeRu3(CO)13 and HFeCo3(CO)12 each tetrahedron contains one iron atom and three ruthenium or cobalt atoms, respectively. The coordination sphere contains the carbonyl as well as hydride ligands, which results in a highly symmetrical molecule
  • [HFeCo3(CO)12]− anion is markedly larger than that on the cobalt atoms forming the base plane. The situation is different for H2FeRu3(CO)13 where the C3v symmetry is broken with a bridging CO between two of the three base plane metal atoms (Ru) and the apex iron. The HOMO of H2FeRu3(CO)13 shows a bonding
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Published 14 Feb 2018

Electron interaction with copper(II) carboxylate compounds

  • Michal Lacko,
  • Peter Papp,
  • Iwona B. Szymańska,
  • Edward Szłyk and
  • Štefan Matejčík

Beilstein J. Nanotechnol. 2018, 9, 384–398, doi:10.3762/bjnano.9.38

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  • purities of W from 55 to 70% [6][7]. For comparison, the deposition of cobalt from Co(CO)3(NO) leads to around 50% purity [8] or satisfying purity over 95% using the dimer Co2(CO)8 [9]. Only few types of precursor molecules can be converted into a layer with satisfying level of purity, for other elements
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Published 01 Feb 2018

Atomic layer deposition and properties of ZrO2/Fe2O3 thin films

  • Kristjan Kalam,
  • Helina Seemen,
  • Peeter Ritslaid,
  • Mihkel Rähn,
  • Aile Tamm,
  • Kaupo Kukli,
  • Aarne Kasikov,
  • Joosep Link,
  • Raivo Stern,
  • Salvador Dueñas,
  • Helena Castán and
  • Héctor García

Beilstein J. Nanotechnol. 2018, 9, 119–128, doi:10.3762/bjnano.9.14

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  • ZrO2 films co-doped with both iron and cobalt, whereas in the films doped only with 1% iron, only paramagnetic behavior was observed [10]. In our films in the present study, the material layers were evidently crystallized already in the as-deposited state, which was sufficient for the appearance of
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Published 10 Jan 2018

Comparative study of post-growth annealing of Cu(hfac)2, Co2(CO)8 and Me2Au(acac) metal precursors deposited by FEBID

  • Marcos V. Puydinger dos Santos,
  • Aleksandra Szkudlarek,
  • Artur Rydosz,
  • Carlos Guerra-Nuñez,
  • Fanny Béron,
  • Kleber R. Pirota,
  • Stanislav Moshkalev,
  • José Alexandre Diniz and
  • Ivo Utke

Beilstein J. Nanotechnol. 2018, 9, 91–101, doi:10.3762/bjnano.9.11

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  • average size of the Cu crystals doubles between 100 and 300 °C of annealing temperature, while the composition remains constant. In contrast, for Co-containing deposits oxygen release was observed upon annealing, while the carbon content remained approximately constant; the cobalt atoms coalesced to form
  • removing the carbon matrix and drastically reducing the electrical resistance of the deposit. Keywords: copper; gold; cobalt; focused-electron-beam-induced deposition; noble metal; non-noble metals; post-growth annealing; Introduction Focused-electron-beam-induced deposition (FEBID) constitutes a well
  • materials. We present the potential of this protocol with respect to the aforementioned works for the fabrication of pure copper and gold nanocrystals embedded in a graphitic matrix, as well as cobalt–carbon nanocomposite films, from the as-prepared amorphous metal–C deposit. Finally, a new H2-assisted Au–C
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Published 09 Jan 2018

Dry adhesives from carbon nanofibers grown in an open ethanol flame

  • Christian Lutz,
  • Julia Syurik,
  • C. N. Shyam Kumar,
  • Christian Kübel,
  • Michael Bruns and
  • Hendrik Hölscher

Beilstein J. Nanotechnol. 2017, 8, 2719–2728, doi:10.3762/bjnano.8.271

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  • properties that make them the material of choice for many applications [2]. In general, 1D-CNs grow via catalytic centers, typically transition metals such as iron, cobalt or nickel, in the constant presence of a carbon source at temperatures ranging from several hundred up to over thousand degrees Celsius
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Published 15 Dec 2017

Localized growth of carbon nanotubes via lithographic fabrication of metallic deposits

  • Fan Tu,
  • Martin Drost,
  • Imre Szenti,
  • Janos Kiss,
  • Zoltan Kónya and
  • Hubertus Marbach

Beilstein J. Nanotechnol. 2017, 8, 2592–2605, doi:10.3762/bjnano.8.260

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  • though the metal content (Co) of the latter is reduced in comparison to the Fe deposits, effective CNT growth was observed for the Co-containing deposits at lower CVD temperatures than for the corresponding Fe deposits. Keywords: autocatalytic growth; carbon nanotubes; cobalt tricarbonyl nitrosyl
  • coated copper grid of 300 mesh. Two precursors were used for the fabrication of Fe and Co nanostructures: iron pentacarbonyl (Fe(CO)5) and cobalt tricarbonyl nitrosyl (Co(CO)3NO), respectively. Fe(CO)5 was purchased from ACROS organics, Co(CO)3NO was purchased from abcr GmbH & Co. KG. The quality of the
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Published 05 Dec 2017

Direct writing of gold nanostructures with an electron beam: On the way to pure nanostructures by combining optimized deposition with oxygen-plasma treatment

  • Domagoj Belić,
  • Mostafa M. Shawrav,
  • Emmerich Bertagnolli and
  • Heinz D. Wanzenboeck

Beilstein J. Nanotechnol. 2017, 8, 2530–2543, doi:10.3762/bjnano.8.253

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  • purity [48]. For cobalt, a combination of heat, H2 exposure and electron irradiation improved the metal content in the deposits [49]. Similarly, in the case of platinum, several purification approaches have been studied, including laser assisted purification [50][51], a sequential EBID process and
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Published 29 Nov 2017

Synthesis of metal-fluoride nanoparticles supported on thermally reduced graphite oxide

  • Alexa Schmitz,
  • Kai Schütte,
  • Vesko Ilievski,
  • Juri Barthel,
  • Laura Burk,
  • Rolf Mülhaupt,
  • Junpei Yue,
  • Bernd Smarsly and
  • Christoph Janiak

Beilstein J. Nanotechnol. 2017, 8, 2474–2483, doi:10.3762/bjnano.8.247

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  • performance of lithium-ion batteries [58][59][60][61]. Herein, we report on the utilization of metal amidinates (M{MeC[N(iPr)]2}n or M(AMD)n) of iron, cobalt and praseodymium and of tris(2,2,6,6-tetramethyl-3,5-heptanedionato)europium, Eu(dpm)3 as precursors with different types of TRGO for the synthesis of
  • of cobalt amidinate on TRGO-300 to TRGO-750 rather aggregated metal assemblies were obtained under the used reaction conditions so that individual particles were difficult to discern and no clear sizes could be derived (Figures S9 and S13 in Supporting Information File 1). TRGO-SH was derived from
  • TRGO-400 by reaction with lithium diisopropylamide (LDA) and propylene sulfide. Subsequently, the TRGO-SH carries sulfur functionalities on the surface that were intended to increase the interactions with the nanoparticles (see Scheme S2, Supporting Information File 1) [7]. Also, from cobalt amidinate
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Published 22 Nov 2017

Dynamic behavior of a nematic liquid crystal mixed with CoFe2O4 ferromagnetic nanoparticles in a magnetic field

  • Emil Petrescu,
  • Cristina Cirtoaje and
  • Cristina Stan

Beilstein J. Nanotechnol. 2017, 8, 2467–2473, doi:10.3762/bjnano.8.246

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  • chloride and cobalt sulfate at a molar ratio of 2:1 in alkaline reaction medium (2 M NaOH) as described in detail in [20]. After the precipitated particles were separated from the reaction medium, they were repeatedly washed with deionized water. An aqueous solution of perchloric acid (25%) was added to
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Published 22 Nov 2017

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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  • nanostructures for a broad range of technical applications. Experimental Materials Cerium(III) nitrate hexahydrate (Ce(NO3)3·6H2O), concentrated nitric acid (HNO3, 68%), diethylene glycol (DEG), acetone, copper(II) acetate monohydrate (Cu(CH3COO)2·H2O), nickel(II) acetate tetrahydrate (Ni(CH3COO)2·4H2O), cobalt
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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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  • reaction channel decreases with the number of carbonyl groups that are detached from the TNI to form the respective anions. This behavior has already been reported from DEA to metal carbonyls (e.g., Ni(CO)4, Fe(CO)5, Cr(CO)6, Mo(CO)6, W(CO)6) [32], as well as from cobalt tricarbonylnitrosyl [9], and π
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Published 30 Oct 2017

Magnetic properties of optimized cobalt nanospheres grown by focused electron beam induced deposition (FEBID) on cantilever tips

  • Soraya Sangiao,
  • César Magén,
  • Darius Mofakhami,
  • Grégoire de Loubens and
  • José María De Teresa

Beilstein J. Nanotechnol. 2017, 8, 2106–2115, doi:10.3762/bjnano.8.210

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  • work, we present a detailed investigation of the magnetic properties of cobalt nanospheres grown on cantilever tips by focused electron beam induced deposition (FEBID). The cantilevers are extremely soft and the cobalt nanospheres are optimized for magnetic resonance force microscopy (MRFM) experiments
  • , which implies that the cobalt nanospheres must be as small as possible while bearing high saturation magnetization. It was found that the cobalt content and the corresponding saturation magnetization of the nanospheres decrease for nanosphere diameters less than 300 nm. Electron holography measurements
  • show the formation of a magnetic vortex state in remanence, which nicely agrees with magnetic hysteresis loops performed by local magnetometry showing negligible remanent magnetization. As investigated by local magnetometry, optimal behavior for high-resolution MRFM has been found for cobalt
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Published 09 Oct 2017

Electronic structure, transport, and collective effects in molecular layered systems

  • Torsten Hahn,
  • Tim Ludwig,
  • Carsten Timm and
  • Jens Kortus

Beilstein J. Nanotechnol. 2017, 8, 2094–2105, doi:10.3762/bjnano.8.209

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  • the two organic systems between Au(111) surfaces. The electronic properties of both systems are altered due to the interaction with the gold surface. While in the contact-free CoPc/CoPc stack, the cobalt atoms couple antiferromagnetically, yielding an S = 0 system, the interaction with the gold
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Published 06 Oct 2017

Synthesis and catalytic application of magnetic Co–Cu nanowires

  • Lijuan Sun,
  • Xiaoyu Li,
  • Zhiqiang Xu,
  • Kenan Xie and
  • Li Liao

Beilstein J. Nanotechnol. 2017, 8, 1769–1773, doi:10.3762/bjnano.8.178

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  • the product of Co nanowires was collected and rinsed three times with deionized water and ethanol, respectively. Next, 0.3 mL of 80 wt % N2H4·H2O were added to the cobalt nanowires with 60 mL of deionized water in a glass beaker, and heated in a water bath at a stationary temperature of 80 °C
  • elemental spectrum corresponding to the selected area. Figure 4b shows that the as-prepared product contained elemental cobalt as well as elemental copper, which is in accordance with the XRD patterns. Additionally, silicon, carbon and platinum peaks were from the calculation of the elementary composition
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Published 25 Aug 2017
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