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Search for "core–shell" in Full Text gives 238 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Synthesis of nickel/gallium nanoalloys using a dual-source approach in 1-alkyl-3-methylimidazole ionic liquids

  • Ilka Simon,
  • Julius Hornung,
  • Juri Barthel,
  • Jörg Thomas,
  • Maik Finze,
  • Roland A. Fischer and
  • Christoph Janiak

Beilstein J. Nanotechnol. 2019, 10, 1754–1767, doi:10.3762/bjnano.10.171

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  • to NiGa nanoparticles. To complete this investigation, GaCp* was successfully decomposed in [BMIm][NTf2] to Ga2O3-doped Ga particles with a size of 350 ± 100 nm. The formation of coreshell sparticles can be ruled out by HRTEM/STEM-EDX-measurements. Phase-pure NiGa nanoparticles were tested in the
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Published 21 Aug 2019

Novel hollow titanium dioxide nanospheres with antimicrobial activity against resistant bacteria

  • Carol López de Dicastillo,
  • Cristian Patiño,
  • María José Galotto,
  • Yesseny Vásquez-Martínez,
  • Claudia Torrent,
  • Daniela Alburquenque,
  • Alejandro Pereira and
  • Juan Escrig

Beilstein J. Nanotechnol. 2019, 10, 1716–1725, doi:10.3762/bjnano.10.167

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  • using the DIFFRAC.SAXS program that can fit and evaluate the size of the structures assuming different geometries. In this work, a core/shell particle was obtained with a particle radius of 345 nm and a shell thickness of approximately 17 nm. These results revealed an excellent agreement with the data
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Published 19 Aug 2019

Synthesis of P- and N-doped carbon catalysts for the oxygen reduction reaction via controlled phosphoric acid treatment of folic acid

  • Rieko Kobayashi,
  • Takafumi Ishii,
  • Yasuo Imashiro and
  • Jun-ichi Ozaki

Beilstein J. Nanotechnol. 2019, 10, 1497–1510, doi:10.3762/bjnano.10.148

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  • application as domestic, back-up, and vehicle power sources. The cost of cathode catalysts can be reduced in a number of ways, e.g., by alloying Pt with base metals [2], forming coreshell particles with base-metal cores covered by thin Pt layers [3], and developing non-Pt catalysts. In particular, the
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Published 25 Jul 2019

Warped graphitic layers generated by oxidation of fullerene extraction residue and its oxygen reduction catalytic activity

  • Machiko Takigami,
  • Rieko Kobayashi,
  • Takafumi Ishii,
  • Yasuo Imashiro and
  • Jun-ichi Ozaki

Beilstein J. Nanotechnol. 2019, 10, 1391–1400, doi:10.3762/bjnano.10.137

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  • activity of platinum catalysts is the most realistic approach; for example, by creating alloys [2] or coreshell structures [3] or by activating the Pt particles through metal support interactions [4]. Developing non-precious-metal catalysts is a fascinating, but ultimately speculative, technology for
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Published 12 Jul 2019

Gas sensing properties of individual SnO2 nanowires and SnO2 sol–gel nanocomposites

  • Alexey V. Shaposhnik,
  • Dmitry A. Shaposhnik,
  • Sergey Yu. Turishchev,
  • Olga A. Chuvenkova,
  • Stanislav V. Ryabtsev,
  • Alexey A. Vasiliev,
  • Xavier Vilanova,
  • Francisco Hernandez-Ramirez and
  • Joan R. Morante

Beilstein J. Nanotechnol. 2019, 10, 1380–1390, doi:10.3762/bjnano.10.136

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  • nanowires (Figure 7) consist of single crystals. These crystals have a very large surface, which can be similar to natural tin dioxide (see XPS data). At the same time, it is possible to assume the formation of coreshell structures in the case of SnO2 powder samples. Due to their special formation process
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Published 08 Jul 2019

Alloyed Pt3M (M = Co, Ni) nanoparticles supported on S- and N-doped carbon nanotubes for the oxygen reduction reaction

  • Stéphane Louisia,
  • Yohann R. J. Thomas,
  • Pierre Lecante,
  • Marie Heitzmann,
  • M. Rosa Axet,
  • Pierre-André Jacques and
  • Philippe Serp

Beilstein J. Nanotechnol. 2019, 10, 1251–1269, doi:10.3762/bjnano.10.125

Graphical Abstract
  • ]. This carbon corrosion modifies the mass transport properties of the active layer, especially for the water management, and accelerates the degradation of the Pt NPs [10][11]. One way to reduce the Pt content is to use more active, tailored NPs [12][13], for example, bimetallic NPs with a coreshell
  • Ni at the surface of the N-CNTs. HRTEM images of the bimetallic catalysts Pt3Co/N-CNT and Pt3Ni/N-CNTHT do not evidence the formation of coreshell NPs (Figure 7). The interplanar distance of 0.22 nm was found for Pt3Co/N-CNT NPs and Pt3Ni/N-CNTHT NPs (Figure 7), which is slightly smaller than the
  • selected area) displaying a Pt3Co composition. The absence of Co NPs in the Co/N-CNT sample, and the composition and structure of the Pt3Co/N-CNTs, indicate that the Pt3Co/N-CNT is more likely an alloy than a coreshell structure. The presence of residual cobalt atoms or clusters on the CNT surface was
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Published 21 Jun 2019

Electroluminescence and current–voltage measurements of single-(In,Ga)N/GaN-nanowire light-emitting diodes in a nanowire ensemble

  • David van Treeck,
  • Johannes Ledig,
  • Gregor Scholz,
  • Jonas Lähnemann,
  • Mattia Musolino,
  • Abbes Tahraoui,
  • Oliver Brandt,
  • Andreas Waag,
  • Henning Riechert and
  • Lutz Geelhaar

Beilstein J. Nanotechnol. 2019, 10, 1177–1187, doi:10.3762/bjnano.10.117

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  • -based coreshell NW structures grown by metalorganic chemical vapor deposition it was found that the FWHM increases with decreasing emission energy [13]. In order to better understand the charge-carrier transport in single-NW LEDs, in Figure 5a we analyze the I–V curves for the NWs C, E, and G, as well
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Published 05 Jun 2019

Polydopamine-coated Au nanorods for targeted fluorescent cell imaging and photothermal therapy

  • Boris N. Khlebtsov,
  • Andrey M. Burov,
  • Timofey E. Pylaev and
  • Nikolai G. Khlebtsov

Beilstein J. Nanotechnol. 2019, 10, 794–803, doi:10.3762/bjnano.10.79

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  • 10.3762/bjnano.10.79 Abstract Au nanorods (AuNRs) have attracted a great interest as a platform for constructing various composite core/shell nanoparticles for theranostics applications. However, the development of robust methods for coating AuNRs with a biocompatible shell of high loading capacity and
  • integrate various functionalities by incorporating different diagnostic and therapeutic agents into a single core/shell nanoparticle. Au nanorods (AuNRs) have attracted a great interest as a platform for theranostic applications because of tunable optical properties and simple protocols for synthesis with
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Published 01 Apr 2019

Renewable energy conversion using nano- and microstructured materials

  • Harry Mönig and
  • Martina Schmid

Beilstein J. Nanotechnol. 2019, 10, 771–773, doi:10.3762/bjnano.10.76

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  • benefits arising from coreshell nanowire arrays for Si heterojunction solar cells. Contacts with a high surface-to-volume ratio can clearly be seen. Particularly in photovoltaics, they may be prone to increased recombination losses. For other applications, such as water splitting, porous materials may
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Published 26 Mar 2019

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

  • Michael D. Ballentine,
  • Elizabeth G. Embry,
  • Marco A. Garcia and
  • Lawrence J. Hill

Beilstein J. Nanotechnol. 2019, 10, 718–724, doi:10.3762/bjnano.10.71

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  • an ionic liquid, and the effect this has on catalytic performance. Platinum, gold, and silver nanoparticles were deposited onto CdSe@CdS (core@shell) nanorods from metal salts in an ionic liquid (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) without additional surfactants or reducing
  • using the methods reported here. Keywords: catalyst; ionic liquid; methylene blue; platinum; semiconductor nanorod; Introduction Core@shell semiconductor nanorods with attached noble metal particles have been widely studied as photocatalysts, and any improvement on the synthesis of these materials has
  • be used to deposit nanoscopic noble metal particles onto a well-defined semiconductor nanorod substrate with diameters less than 10 nm. We found that photodeposition of platinum onto CdSe@CdS (core@shell) nanorods proceeded readily from Pt(acac)2 in the ionic liquid 1-butyl-3-methylimidazolium bis
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Published 14 Mar 2019

Ceria/polymer nanocontainers for high-performance encapsulation of fluorophores

  • Kartheek Katta,
  • Dmitry Busko,
  • Yuri Avlasevich,
  • Katharina Landfester,
  • Stanislav Baluschev and
  • Rafael Muñoz-Espí

Beilstein J. Nanotechnol. 2019, 10, 522–530, doi:10.3762/bjnano.10.53

Graphical Abstract
  • ; singlet oxygen; Introduction Hybrid polymeric coreshell nanoparticles with encapsulated fluorescent dye molecules are frequently employed for life-science applications, such as cell labeling and drug delivery [1][2][3][4][5]. In recent years, polymeric hybrid nanoparticles and nanocapsules with tailored
  • materials. The coreshell structure of the hybrid organic–inorganic nanoparticles allows for the independent molecular design of each part. For instance, the oxygen permeability of the shell material can be lowered drastically by using semicrystalline nanocellulose [31]. Furthermore, a bovine serum albumin
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Published 22 Feb 2019

Improving control of carbide-derived carbon microstructure by immobilization of a transition-metal catalyst within the shell of carbide/carbon core–shell structures

  • Teguh Ariyanto,
  • Jan Glaesel,
  • Andreas Kern,
  • Gui-Rong Zhang and
  • Bastian J. M. Etzold

Beilstein J. Nanotechnol. 2019, 10, 419–427, doi:10.3762/bjnano.10.41

Graphical Abstract
  • heterogeneous combination. Immobilizing the transition metal-catalyst at each particle would ensure a homogeneous catalytic graphitization of the whole powder samples. We recently introduced the possibility to obtain coreshell particles in which a nanoporous carbon shell is covering a carbide core [14][15][24
  • carbide-derived carbon would be influenced by the transition-metal catalyst in the shell of each particle. This work studies the use of coreshell carbon/carbide hybrids to immobilize different amounts of graphitization catalyst as illustrated in Figure 1. The resulting microstructure and pore structure
  • impregnation of untreated titanium carbide was compared with the same loading (30 mg of nickel per gram of equivalent carbide). EDX mapping (see Figure S1 in Supporting Information File 1) of the impregnated coreshell material shows clearly the remaining core in the Ti K edge signal, while the Ni K and Cl K
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Published 11 Feb 2019

Geometrical optimisation of core–shell nanowire arrays for enhanced absorption in thin crystalline silicon heterojunction solar cells

  • Robin Vismara,
  • Olindo Isabella,
  • Andrea Ingenito,
  • Fai Tong Si and
  • Miro Zeman

Beilstein J. Nanotechnol. 2019, 10, 322–331, doi:10.3762/bjnano.10.31

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Published 31 Jan 2019

Site-specific growth of oriented ZnO nanocrystal arrays

  • Rekha Bai,
  • Dinesh K. Pandya,
  • Sujeet Chaudhary,
  • Veer Dhaka,
  • Vladislav Khayrudinov,
  • Jori Lemettinen,
  • Christoffer Kauppinen and
  • Harri Lipsanen

Beilstein J. Nanotechnol. 2019, 10, 274–280, doi:10.3762/bjnano.10.26

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  • collected on the substrate. However, in applications like solar cells based on core/shell ZnO nanocrystals, site-specific growth of the well-aligned nanocrystals is quite important. Therefore, the position-controlled oriented growth of ZnO NC array architectures is highly desirable for practical
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Published 24 Jan 2019

Surface plasmon resonance enhancement of photoluminescence intensity and bioimaging application of gold nanorod@CdSe/ZnS quantum dots

  • Siyi Hu,
  • Yu Ren,
  • Yue Wang,
  • Jinhua Li,
  • Junle Qu,
  • Liwei Liu,
  • Hanbin Ma and
  • Yuguo Tang

Beilstein J. Nanotechnol. 2019, 10, 22–31, doi:10.3762/bjnano.10.3

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  • Technology, Changchun 130022, P. R. China College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R. China 10.3762/bjnano.10.3 Abstract Biological applications of core/shell near-infrared quantum dots (QDs) have attracted broad interest due to their unique optical and chemical
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Published 03 Jan 2019

Colloidal chemistry with patchy silica nanoparticles

  • Pierre-Etienne Rouet,
  • Cyril Chomette,
  • Laurent Adumeau,
  • Etienne Duguet and
  • Serge Ravaine

Beilstein J. Nanotechnol. 2018, 9, 2989–2998, doi:10.3762/bjnano.9.278

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  • , i.e., well-calibrated silica nanospheres or coreshell nanoparticles, were obtained according to a seeded-growth protocol [22] and a method using methoxy poly(ethylene glycol)-thiol as a coupling agent [23], respectively. Their surface functionalization with carboxylic acid groups was performed by a
  • AXnY4−n-type and AXnY2−n-type CMs where 0 < n < 4 and 0 < n < 2, respectively. We used 90 nm coreshell nanoparticles as a second batch of satellites. This choice was motivated by two reasons. Firstly, we had to work with satellites with a slightly different diameter to mimic another type of atoms
  • of gold, coreshell nanoparticles can indeed be easily distinguished from silica nanospheres of similar size. We mixed the sp3-like CAs with 100 nm nanospheres and 90 nm coreshell nanoparticles in a 4/n/(4 − n) ratio. Figure 4a–d shows that the colloidal analogues of molecules such as
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Published 06 Dec 2018

Improved catalytic combustion of methane using CuO nanobelts with predominantly (001) surfaces

  • Qingquan Kong,
  • Yichun Yin,
  • Bing Xue,
  • Yonggang Jin,
  • Wei Feng,
  • Zhi-Gang Chen,
  • Shi Su and
  • Chenghua Sun

Beilstein J. Nanotechnol. 2018, 9, 2526–2532, doi:10.3762/bjnano.9.235

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  • , NW and NB samples where the oxidation activity follows the order: NBs > NWs > NPs. It is particularly notable that the NB performance is even close to that of 1% Pd loaded on Co3O4 [27], which itself shows excellent catalytic capacity. Supermolecular Pd@CeO2 coreshell structures can offer
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Published 24 Sep 2018

Nanocellulose: Recent advances and its prospects in environmental remediation

  • Katrina Pui Yee Shak,
  • Yean Ling Pang and
  • Shee Keat Mah

Beilstein J. Nanotechnol. 2018, 9, 2479–2498, doi:10.3762/bjnano.9.232

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  • magnetic field. As a result, magnetic nanomaterials have drawn increasing attention. Nanocellulose incorporated with other magnetic nanomaterials is presented as an excellent composite adsorbent with magnetic properties. For example, a coreshell cellulose magnetite (Fe3O4) polymeric ionic liquid magnetic
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Published 19 Sep 2018

Effect of electrospinning process variables on the size of polymer fibers and bead-on-string structures established with a 23 factorial design

  • Paulina Korycka,
  • Adam Mirek,
  • Katarzyna Kramek-Romanowska,
  • Marcin Grzeczkowicz and
  • Dorota Lewińska

Beilstein J. Nanotechnol. 2018, 9, 2466–2478, doi:10.3762/bjnano.9.231

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  • , it is possible to obtain fibers of different structure: porous, smooth, coreshell, hollow structures and layer-by-layer stacked films or uniaxially aligned arrays [2]. Because of the variety of obtained structures that are possible, electrospun nanofibers find applications in well-established
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Published 17 Sep 2018

Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

  • Malkeshkumar Patel and
  • Joondong Kim

Beilstein J. Nanotechnol. 2018, 9, 2432–2442, doi:10.3762/bjnano.9.228

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  • typically difficult to obtain in samples grown using Kirkendall diffusion oxidation, as it generally leads to a coreshell structures. However, here it yielded a porous Co3O4 film that can be applied in water-splitting devices. An elemental line profile garnered from energy dispersive spectroscopy as shown
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Published 12 Sep 2018

Droplet-based synthesis of homogeneous magnetic iron oxide nanoparticles

  • Christian D. Ahrberg,
  • Ji Wook Choi and
  • Bong Geun Chung

Beilstein J. Nanotechnol. 2018, 9, 2413–2420, doi:10.3762/bjnano.9.226

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  • -stage synthesis system would be of interest. Through this, larger nanoparticles could be synthesized by successive addition of reagents to the droplets, or coreshell particles could be made in a multi-step reaction within the droplets. Schematic of the experimental setup showing the three syringe pumps
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Published 10 Sep 2018

Optimization of the optical coupling in nanowire-based integrated photonic platforms by FDTD simulation

  • Nan Guan,
  • Andrey Babichev,
  • Martin Foldyna,
  • Dmitry Denisov,
  • François H. Julien and
  • Maria Tchernycheva

Beilstein J. Nanotechnol. 2018, 9, 2248–2254, doi:10.3762/bjnano.9.209

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  • modes in a GaN nanowire with hexagonal shape calculated using COMSOL [32] mode solver at a wavelength of 400 nm. It is difficult to estimate precisely which modes are excited in an operating core/shell LED. For light propagation simulations, we simulate the light generation in the LED nanowire by
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Published 22 Aug 2018

Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials

  • Muhammad Imran,
  • Nunzio Motta and
  • Mahnaz Shafiei

Beilstein J. Nanotechnol. 2018, 9, 2128–2170, doi:10.3762/bjnano.9.202

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  • composites, are fabricated in various assemblies (e.g., as mixed nanocomposites, double-layers, coreshell or hollow forms) using the electrospinning technique [37]. These electrospun nanofibers exhibit enhanced specific surface area, superior mechanical properties, nanoporosity and improved surface
  • reinforced with GO show better mechanical, electrical and thermal properties than the fibers without GO. These graphene-based composite electrospun fibers have been used for biosensor applications [65][68]. Hybrid nanofibers with various morphologies, including mixed nanocomposite, dual-layer, coreshell and
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Published 13 Aug 2018

Nanoconjugates of a calixresorcinarene derivative with methoxy poly(ethylene glycol) fragments for drug encapsulation

  • Alina M. Ermakova,
  • Julia E. Morozova,
  • Yana V. Shalaeva,
  • Victor V. Syakaev,
  • Aidar T. Gubaidullin,
  • Alexandra D. Voloshina,
  • Vladimir V. Zobov,
  • Irek R. Nizameev,
  • Olga B. Bazanova,
  • Igor S. Antipin and
  • Alexander I. Konovalov

Beilstein J. Nanotechnol. 2018, 9, 2057–2070, doi:10.3762/bjnano.9.195

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  • calixarene and calixresorcinarene polylactide star polymers [19]. Self-association and hemotoxicity of 3 First, the self-association of macrocycle 3 in the aqueous solution was studied by using small-angle X-ray scattering (SAXS). The obtained data are typical for coreshell particles that practically do not
  • participate in the formation of coreshell particles in aqueous solution. The critical association concentration (cac) value of 3 was obtained by using the fluorescent pyrene-probe method. It amounts to 0.01 mg/mL (Figure S8, Supporting Information File 1). mPEG-550 does not form self-organised structures
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Published 27 Jul 2018

Synthesis of a MnO2/Fe3O4/diatomite nanocomposite as an efficient heterogeneous Fenton-like catalyst for methylene blue degradation

  • Zishun Li,
  • Xuekun Tang,
  • Kun Liu,
  • Jing Huang,
  • Yueyang Xu,
  • Qian Peng and
  • Minlin Ao

Beilstein J. Nanotechnol. 2018, 9, 1940–1950, doi:10.3762/bjnano.9.185

Graphical Abstract
  • agglomerate and are difficult to be dispersed because of the large surface energy, thus active sites on the surface of catalysts are covered, which causes huge impact on the practical catalytic performance. In order to solve the problem, loading the catalysts on appropriate carriers to form a coreshell
  • significantly enhance the catalytic performance compared to the single-component catalysts [10]. In addition, the synergistic effect of the composite is deeply influenced by the contact area between the two phases, thus the coreshell structure of catalysts can dramatically magnify the contact area and further
  • , Supporting Information File 1), the SEM and TEM images show that the pure MnO2 agglomerates into large micrometer-sized particles, in contrast to the monodisperse nano-MnO2 in the MnO2/Fe3O4/diatomite composite. The TEM analysis confirms the successful synthesis of the coreshell structured MnO2/Fe3O4
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Published 06 Jul 2018
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