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Search for "graphene" in Full Text gives 521 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

An advanced structural characterization of templated meso-macroporous carbon monoliths by small- and wide-angle scattering techniques

  • Felix M. Badaczewski,
  • Marc O. Loeh,
  • Torben Pfaff,
  • Dirk Wallacher,
  • Daniel Clemens and
  • Bernd M. Smarsly

Beilstein J. Nanotechnol. 2020, 11, 310–322, doi:10.3762/bjnano.11.23

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  • process is analyzed by special evaluation approaches for SANS and wide-angle X-ray scattering (WAXS). The WAXS analysis shows that the pitch-based monolithic material exhibits a more ordered microstructure consisting of larger graphene stacks and similar graphene layer sizes compared to the monolithic
  • can markedly affect the nanoscale porosity [13][14][15][16][17][18][19][20][21]. Hence, a combined in-depth elucidation of meso/microporosity and the graphene-based structure upon heat treatment is pursued in this study to obtain a profound understanding of the relationship between the changes in the
  • nanopore space and the building blocks surrounding the nanopores. In essence, the structure of “non-graphitic carbon materials” consists of hexagonal graphene layers that are stacked in a parallel way but do not possess 3D long-range crystallographic order. This structure is referred to as “turbostratic
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Published 10 Feb 2020

Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field

  • Levente Máthé and
  • Ioan Grosu

Beilstein J. Nanotechnol. 2020, 11, 225–239, doi:10.3762/bjnano.11.17

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  • transport phenomena in a quantum dot coupled to pure monolayer graphene electrodes under external magnetic fields for finite on-site Coulomb interaction. The system is described by the pseudogap Anderson Hamiltonian. We use the equation of motion technique to determine the retarded Green’s function of the
  • quantum dot. An analytical formula for the Kondo temperature is derived for electron and hole doping of the graphene leads. The Kondo temperature vanishes in the vicinity of the particle–hole symmetry point and at the Dirac point. In the case of particle–hole asymmetry, the Kondo temperature has a finite
  • does not show up in the density of states and in the differential conductance for zero chemical potential due to the linear energy dispersion of graphene. An analytical method to calculate self-energies is also developed which can be useful in the study of graphene-based systems. Conclusion: Our
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Published 20 Jan 2020

Size effects of graphene nanoplatelets on the properties of high-density polyethylene nanocomposites: morphological, thermal, electrical, and mechanical characterization

  • Tuba Evgin,
  • Alpaslan Turgut,
  • Georges Hamaoui,
  • Zdenko Spitalsky,
  • Nicolas Horny,
  • Matej Micusik,
  • Mihai Chirtoc,
  • Mehmet Sarikanat and
  • Maria Omastova

Beilstein J. Nanotechnol. 2020, 11, 167–179, doi:10.3762/bjnano.11.14

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  • of Mechanical Engineering, Ege University, 35100, Bornova, Izmir, Turkey 10.3762/bjnano.11.14 Abstract High-density polyethylene (HDPE)-based nanocomposites incorporating three different types of graphene nanoplatelets (GnPs) were fabricated to investigate the size effects of GnPs in terms of both
  • ’ mechanical properties due to poorer dispersion compared to the others. In addition, the size of the GnPs had no considerable effect on the melting and crystallization properties of the HDPE/GnP nanocomposites. Keywords: electrical properties; graphene nanoplatelets; mechanical properties; polymer matrix
  • enhancement of the properties of the nanocomposites at relatively low filler concentration compared to others [1][3][4]. Using graphene, a single-atom-thick structure of sp2 hybridized carbon atoms in a hexagonal arrangement, is of great interest due to its large specific surface area, 2D structure, and
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Published 14 Jan 2020

Nonclassical dynamic modeling of nano/microparticles during nanomanipulation processes

  • Moharam Habibnejad Korayem,
  • Ali Asghar Farid and
  • Rouzbeh Nouhi Hefzabad

Beilstein J. Nanotechnol. 2020, 11, 147–166, doi:10.3762/bjnano.11.13

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  • rectangular cantilever was presented for the first time [16]. Kawai et al. turned the spotlight on the superlubricity of graphene nanoparticles sliding on a gold substrate considering both computational and experimental approaches [17]. Liu et al. introduced a new strategy for manipulating nanoparticles
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Published 13 Jan 2020

Simple synthesis of nanosheets of rGO and nitrogenated rGO

  • Pallellappa Chithaiah,
  • Madhan Mohan Raju,
  • Giridhar U. Kulkarni and
  • C. N. R. Rao

Beilstein J. Nanotechnol. 2020, 11, 68–75, doi:10.3762/bjnano.11.7

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  • , 560064, India 10.3762/bjnano.11.7 Abstract A green and facile approach has been developed for the large-scale synthesis of nanosheets of reduced graphene oxide (rGO) and nitrogenated reduced graphene oxide (N-rGO). This has been achieved by direct thermal decomposition of sucrose and glycine at 475 °C
  • hydrogen treated (H-rGO) samples. Keywords: nanosheets; nitrogenated reduced graphene oxide (N-rGO); reduced graphene oxide (rGO); supercapacitors; thermal decomposition; Introduction Graphene, the one atom thick two-dimensional material of sp2-hybridized carbon atoms has attracted much attention after
  • its discovery [1][2]. It is a fascinating material used in various applications owing to its excellent electrical, optical, mechanical and thermal properties [3][4][5]. It has a unique electronic structure with a linear dispersion of Dirac electrons. Graphene oxide (GO) and reduced graphene oxide (rGO
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Published 07 Jan 2020

Synthesis of amorphous and graphitized porous nitrogen-doped carbon spheres as oxygen reduction reaction catalysts

  • Maximilian Wassner,
  • Markus Eckardt,
  • Andreas Reyer,
  • Thomas Diemant,
  • Michael S. Elsaesser,
  • R. Jürgen Behm and
  • Nicola Hüsing

Beilstein J. Nanotechnol. 2020, 11, 1–15, doi:10.3762/bjnano.11.1

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  • they can result in further advantages such as an improved tolerance towards impurities compared to Pt-based catalysts [1]. A wide variety of N-doped carbon materials is known from the literature, reaching from N-doped graphene and graphite, N-doped carbon nanotubes, carbon cages, carbon cups and carbon
  • fibers [7][8][9][10], N-doped 3D ordered (meso)porous carbon materials [11], N-doped carbon composites (e.g., carbon nanotubes/graphene) [12], and N-doped carbon spheres [13][14] to graphitic-C3N4 carbon nitride composites [15]. In the present work we report results of a systematic study on the synthesis
  • are chemical vapor deposition (CVD) and arc discharge methods for N-doped graphene, graphite, and carbon nanotubes [9]. Most commonly, the post-synthetic approach is carried out by thermal treatment of carbon in ammonia atmosphere, typically leading to surface N-doping. A variety of N bonding
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Published 02 Jan 2020

Advanced hybrid nanomaterials

  • Andreas Taubert,
  • Fabrice Leroux,
  • Pierre Rabu and
  • Verónica de Zea Bermudez

Beilstein J. Nanotechnol. 2019, 10, 2563–2567, doi:10.3762/bjnano.10.247

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  • ]. The mesostructures are highly pH-sensitive, adopting 2D-hexagonal, wormlike or lamellar organization depending on the extent of the electrostatic complexing bonds and on the condensation rate. More complex assemblies involving ternary compositions in “Ternary nanocomposites of reduced graphene oxide
  • , polyaniline and hexaniobate: hierarchical architecture and high polaron formation” were explored for the promotion of synergistic effects expected at the nanoscale [23]. The resulting mixture between polyaniline chains with reduced graphene flakes and hexaniobate nanoscrolls may find application as coatings
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Published 20 Dec 2019

Synthesis and acetone sensing properties of ZnFe2O4/rGO gas sensors

  • Kaidi Wu,
  • Yifan Luo,
  • Ying Li and
  • Chao Zhang

Beilstein J. Nanotechnol. 2019, 10, 2516–2526, doi:10.3762/bjnano.10.242

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  • of ZnFe2O4 and reduced graphene oxide (rGO) with different rGO content were prepared via a simple solvothermal method followed by a high-temperature annealing process in an inert atmosphere. The X-ray diffraction analysis confirmed that the introduction of rGO had no effect on the spinel structure of
  • ; composites; gas sensor; reduced graphene oxide (rGO); ZnFe2O4 hollow spheres; Introduction As a synthetic raw material in industrial production, acetone is chemically active and extremely flammable. It is toxic if its concentration exceeds 173 ppm, and long-term exposure to acetone poses a serious threat to
  • , graphene has a unique structure and distinguished properties. Plenty of works are in progress to investigate the applications of graphene or its derivatives in the field of gas sensing [20][21], including room temperature CO2 gas sensors and room temperature double-layer graphene NO2 gas sensors prepared
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Published 16 Dec 2019

Multiwalled carbon nanotube based aromatic volatile organic compound sensor: sensitivity enhancement through 1-hexadecanethiol functionalisation

  • Nadra Bohli,
  • Meryem Belkilani,
  • Juan Casanova-Chafer,
  • Eduard Llobet and
  • Adnane Abdelghani

Beilstein J. Nanotechnol. 2019, 10, 2364–2373, doi:10.3762/bjnano.10.227

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  • correlated to the active sensing film/material used. Various nanomaterial-based gas sensors have been investigated to monitor the presence of aromatic VOCs. The ones mainly studied are based on metal oxides, carbon nanotubes, graphene and hybrid materials [5][6]. Carbon nanotube based gas sensors (e.g
  • ., single-wall carbon nanotube (SWCNT), multiwall carbon nanotube (MWCNT), graphene, graphene oxide (GO)) present a sensitive active layer exhibiting an electrical resistance change while in contact with the target gas due to interactions at the molecular level [7][8]. These interactions, depending whether
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Published 04 Dec 2019

Integration of sharp silicon nitride tips into high-speed SU8 cantilevers in a batch fabrication process

  • Nahid Hosseini,
  • Matthias Neuenschwander,
  • Oliver Peric,
  • Santiago H. Andany,
  • Jonathan D. Adams and
  • Georg E. Fantner

Beilstein J. Nanotechnol. 2019, 10, 2357–2363, doi:10.3762/bjnano.10.226

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  • prepared with acceptable radii for many imaging purposes [20]. However, the wear rate of SU8 is very high [24], which makes this and other polymers a nonideal tip material. Some attempts to coat SU8 cantilevers and tips with a more wear-resistant material (such as graphene) have been made [25], but yielded
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Published 29 Nov 2019

Design and facile synthesis of defect-rich C-MoS2/rGO nanosheets for enhanced lithium–sulfur battery performance

  • Chengxiang Tian,
  • Juwei Wu,
  • Zheng Ma,
  • Bo Li,
  • Pengcheng Li,
  • Xiaotao Zu and
  • Xia Xiang

Beilstein J. Nanotechnol. 2019, 10, 2251–2260, doi:10.3762/bjnano.10.217

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  • composite with both large surface area and high porosity for the use as advanced electrode material in lithium–sulfur batteries. Double modified defect-rich MoS2 nanosheets are successfully prepared by introducing reduced graphene oxide (rGO) and amorphous carbon. The conductibility of the cathodes can be
  • construction of other high-performance metal disulfide electrodes for electrochemical energy storage. Keywords: annealing; double modification; high-performance electrodes; lithium–sulfur battery; molybdenum disulfide (MoS2); reduced graphene oxide (rGO); Introduction Lithium–sulfur (Li–S) batteries have
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Published 14 Nov 2019

Nontoxic pyrite iron sulfide nanocrystals as second electron acceptor in PTB7:PC71BM-based organic photovoltaic cells

  • Olivia Amargós-Reyes,
  • José-Luis Maldonado,
  • Omar Martínez-Alvarez,
  • María-Elena Nicho,
  • José Santos-Cruz,
  • Juan Nicasio-Collazo,
  • Irving Caballero-Quintana and
  • Concepción Arenas-Arrocena

Beilstein J. Nanotechnol. 2019, 10, 2238–2250, doi:10.3762/bjnano.10.216

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  • graphene has been used to dope the active layer based on P3HT, increasing the conversion efficiency by 59% compared to the undoped devices [43]. Also, solution processable functionalized graphene (SPFG) was incorporated as a third component in PTB7:PC71BM active layers obtaining a PCE increment of 22% with
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Published 14 Nov 2019

Ultrathin Ni1−xCoxS2 nanoflakes as high energy density electrode materials for asymmetric supercapacitors

  • Xiaoxiang Wang,
  • Teng Wang,
  • Rusen Zhou,
  • Lijuan Fan,
  • Shengli Zhang,
  • Feng Yu,
  • Tuquabo Tesfamichael,
  • Liwei Su and
  • Hongxia Wang

Beilstein J. Nanotechnol. 2019, 10, 2207–2216, doi:10.3762/bjnano.10.213

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  • graphene, graphene oxide (GO) or carbon nanotubes (CNTs) in order to improve the charge–discharge process stability [11][12][13]. There are limited reports regarding a comparison of the intrinsic performance between these Ni–Co chalcogenides materials. Even pure Ni–Co chalcogenide nanomaterials have been
  • nanoflakes, the results were compared with previously reported NiCo-based ASCs. The new device outperforms Ni3S2/CoNi2S4/NF//AC [41], NiCo2S4/graphene//AC [39], NiCo2S4/NCF//(OMC = ordered mesoporous carbon)/NCF [31], NiCo2O4//AC [17], NiCo-sulfide//AC [28] and NiCo-hydroxide//AC [42]. The EIS results of the
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Published 11 Nov 2019

Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications

  • Alberto Boretti,
  • Lorenzo Rosa,
  • Jonathan Blackledge and
  • Stefania Castelletto

Beilstein J. Nanotechnol. 2019, 10, 2128–2151, doi:10.3762/bjnano.10.207

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  • such as hexagonal BN. Further, its sensitivity is enough to measure stray fields due to, for instance, the current density in graphene flakes or stray fields generated by a vortex in a 100 nm thick superconducting film. Another application of the NV ensemble magnetometer is reported in [57], where the
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Published 04 Nov 2019

Improvement of the thermoelectric properties of a MoO3 monolayer through oxygen vacancies

  • Wenwen Zheng,
  • Wei Cao,
  • Ziyu Wang,
  • Huixiong Deng,
  • Jing Shi and
  • Rui Xiong

Beilstein J. Nanotechnol. 2019, 10, 2031–2038, doi:10.3762/bjnano.10.199

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  • materials show a better thermoelectric performance than bulk materials [14]. Few-layer MoO3 nanosheets have already been experimentally synthesized by exfoliation similar to graphene [12][13][15][16]. Theoretical research has proved that few-layer MoO3 possesses a markedly high carrier mobility above 3000
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Published 25 Oct 2019

Review of advanced sensor devices employing nanoarchitectonics concepts

  • Katsuhiko Ariga,
  • Tatsuyuki Makita,
  • Masato Ito,
  • Taizo Mori,
  • Shun Watanabe and
  • Jun Takeya

Beilstein J. Nanotechnol. 2019, 10, 2014–2030, doi:10.3762/bjnano.10.198

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  • , require consideration of bending and deformation according to typical human motions. Someya and co-workers developed transparent bending-insensitive pressure sensors [96]. They nanoengineered pressure sensor materials from composites of carbon nanotubes and graphene with a fluorinated copolymer
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Published 16 Oct 2019

Optimization and performance of nitrogen-doped carbon dots as a color conversion layer for white-LED applications

  • Tugrul Guner,
  • Hurriyet Yuce,
  • Didem Tascioglu,
  • Eren Simsek,
  • Umut Savaci,
  • Aziz Genc,
  • Servet Turan and
  • Mustafa M. Demir

Beilstein J. Nanotechnol. 2019, 10, 2004–2013, doi:10.3762/bjnano.10.197

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  • this lattice spacing as the {1120} lattice plane of graphene [55][56]. It should be noted here that when it comes to CDots, it is common to assign them as graphene rather than graphite, since typically, stacking of a few layers of graphene forms the CDots. The HRTEM micrographs obtained from a ≈9 nm
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Published 15 Oct 2019

First principles modeling of pure black phosphorus devices under pressure

  • Ximing Rong,
  • Zhizhou Yu,
  • Zewen Wu,
  • Junjun Li,
  • Bin Wang and
  • Yin Wang

Beilstein J. Nanotechnol. 2019, 10, 1943–1951, doi:10.3762/bjnano.10.190

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  • the use as field-effect transistor [1][25][26][27][28]. Different from the planar 2D materials, such as graphene and silicene, the puckered configuration of BP makes structural deformation much easier by tension or compression along any direction. Meanwhile, large-scale bandgap modulation accompanied
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Published 24 Sep 2019

Facile synthesis of carbon nanotube-supported NiO//Fe2O3 for all-solid-state supercapacitors

  • Shengming Zhang,
  • Xuhui Wang,
  • Yan Li,
  • Xuemei Mu,
  • Yaxiong Zhang,
  • Jingwei Du,
  • Guo Liu,
  • Xiaohui Hua,
  • Yingzhuo Sheng,
  • Erqing Xie and
  • Zhenxing Zhang

Beilstein J. Nanotechnol. 2019, 10, 1923–1932, doi:10.3762/bjnano.10.188

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  • application in various energy-consuming devices. Many materials have been explored to be used in supercapacitors to increase their energy density [4][5]. Carbon materials, especially carbon nanotubes and graphene, endowed with good conductivity and high specific surface area, are ideal candidates, and they
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Published 23 Sep 2019

Remarkable electronic and optical anisotropy of layered 1T’-WTe2 2D materials

  • Qiankun Zhang,
  • Rongjie Zhang,
  • Jiancui Chen,
  • Wanfu Shen,
  • Chunhua An,
  • Xiaodong Hu,
  • Mingli Dong,
  • Jing Liu and
  • Lianqing Zhu

Beilstein J. Nanotechnol. 2019, 10, 1745–1753, doi:10.3762/bjnano.10.170

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  • and the possibility to open up new ways for applications of 2D materials for light polarization detection. Keywords: 1T’-WTe2; 2D material; anisotropic; light polarization; optoelectrical; Introduction The first exfoliation of graphene [1] attracted extensive interest in 2D materials such as black
  • distorted 1T’ atomic phase, and the selected area electron diffraction (SEAD) pattern illustrated in Figure 1c, which demonstrates the rectangular symmetry of 1T’-WTe2 with space group Pmn21. Furthermore, graphene diffraction spots were utilized for calibrating the SAED pattern, and we measured the lattice
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Published 20 Aug 2019

TiO2/GO-coated functional separator to suppress polysulfide migration in lithium–sulfur batteries

  • Ning Liu,
  • Lu Wang,
  • Taizhe Tan,
  • Yan Zhao and
  • Yongguang Zhang

Beilstein J. Nanotechnol. 2019, 10, 1726–1736, doi:10.3762/bjnano.10.168

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  • but suffer from poor cyclic performance due to the dissolution of intermediate polysulfides. Herein, a lightweight nanoporous TiO2 and graphene oxide (GO) composite is prepared and utilized as an interlayer between a Li anode and a sulfur cathode to suppress the polysulfide migration and improve the
  • . Hence, the carbon/metal-oxide hybrid interlayer combines the advantages of carbon and metal oxides and exhibits superior performance over monolithic materials. Recently, the inclusion of V2O5/CNT [29], MoO3@CNT [30], TiO2@CNF [31], TiO2/graphene [32] interlayers has been shown to suppress the shuttle
  • effect and the Li/S batteries with these functional interlayers deliver high gravimetric energy density and superior cyclic performance. Two-dimensional graphene oxide (GO) has excellent thermal stability, an ultrahigh specific surface area, and good electrical conductivity. The polysulfide shuttle can
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Published 19 Aug 2019

Tuning the performance of vanadium redox flow batteries by modifying the structural defects of the carbon felt electrode

  • Ditty Dixon,
  • Deepu Joseph Babu,
  • Aiswarya Bhaskar,
  • Hans-Michael Bruns,
  • Joerg J. Schneider,
  • Frieder Scheiba and
  • Helmut Ehrenberg

Beilstein J. Nanotechnol. 2019, 10, 1698–1706, doi:10.3762/bjnano.10.165

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  • graphitic nature as functionalization proceeds by breaking of the C6 rings, and in many cases, with the formation of a sp3 hybridized carbon atoms (out of plane with the graphene layer). Moreover, most of these functional groups will be predominantly formed at graphite edge sites which are much more active
  • of various groups on the surface of the felt are shown in Figure 2. Thus, from these results, it can be concluded that N2 plasma treatment can be applied to induce N-doping defects. Both pyrrolic as well as pyridinic N observed in the XPS spectra are incorporated into the graphene layer [19][20]. The
  • doping of N as observed here differs from the functionalization by the fact that during the doping process, the N atom is directly bonded with other carbon atoms inside the graphene framework, whereas during the functionalization process, the nitrogen groups are bonded on one of the edge sites of the
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Published 13 Aug 2019

Layered double hydroxide/sepiolite hybrid nanoarchitectures for the controlled release of herbicides

  • Ediana Paula Rebitski,
  • Margarita Darder and
  • Pilar Aranda

Beilstein J. Nanotechnol. 2019, 10, 1679–1690, doi:10.3762/bjnano.10.163

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  • are arranged regularly along the structural edges of the fiber, being advantageous to produce functional nanoarchitectures. Thus, in recent years the number of publications related to the assembly of different types of nanoparticulated solids (e.g., metals, metal oxides, and graphene) and sepiolite or
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Published 09 Aug 2019

Graphynes: an alternative lightweight solution for shock protection

  • Kang Xia,
  • Haifei Zhan,
  • Aimin Ji,
  • Jianli Shao,
  • Yuantong Gu and
  • Zhiyong Li

Beilstein J. Nanotechnol. 2019, 10, 1588–1595, doi:10.3762/bjnano.10.154

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  • carbon allotropes in nature. They consist of networks of sp2- and sp3-hybridized carbon atoms, respectively. Replacing a carbon–carbon bond in graphene by a acetylenic triple bond (–C≡C–), two-dimensional sp–sp2-hybridized GY is obtained [1]. Depending on the percentage of acetylenic linkages, different
  • numerically on their counterpart graphene. Studies have revealed that carbon chains in graphene are surprisingly stable under electron bombardment [23][24][25]. Applying a miniaturized ballistic setup, the specific penetration energy of multilayer graphene has been reported to be more than 10 times higher
  • than that of metal protection materials [26]. Based on this understanding, several in silico works followed. Axial-wave and cone-wave propagation patterns of graphene sheets under supersonic-velocity impact allows the graphene sheets to transfer more momentum per unit area and hence provide better
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Published 31 Jul 2019

Materials nanoarchitectonics at two-dimensional liquid interfaces

  • Katsuhiko Ariga,
  • Michio Matsumoto,
  • Taizo Mori and
  • Lok Kumar Shrestha

Beilstein J. Nanotechnol. 2019, 10, 1559–1587, doi:10.3762/bjnano.10.153

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  • perturbations such as microwave and plasma irradiation [45][46][47][48][49][50][51]. Carbon nanotubes, representative one-dimensional objects, were produced using catalysts as well [52][53][54][55]. Recently, two-dimensional materials such as graphene and MoS2 nanosheets attracted the interests of researchers
  • reported. Jayavel, Shrestha, and co-workers demonstrated the enhanced performance of electrochemical supercapacitors using composites of cobalt oxide nanoparticles and reduced graphene oxide, which are zero-dimensional and two-dimensional nanomaterials, respectively [86]. Leong and co-workers reported a
  • applications (by Xu, Lee, and co-workers [135]) and substrate channelling between enzymes with graphene oxide nanosheets (by Yang and co-workers [136]) can be mentioned. The nanoarchitectonics bottom-up approaches preserving the nanostructural properties are highly useful for the fabrication of low-dimensional
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Published 30 Jul 2019
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