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Search for "nanotubes" in Full Text gives 453 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Wet chemistry route for the decoration of carbon nanotubes with iron oxide nanoparticles for gas sensing

  • Hussam M. Elnabawy,
  • Juan Casanova-Chafer,
  • Badawi Anis,
  • Mostafa Fedawy,
  • Mattia Scardamaglia,
  • Carla Bittencourt,
  • Ahmed S. G. Khalil,
  • Eduard Llobet and
  • Xavier Vilanova

Beilstein J. Nanotechnol. 2019, 10, 105–118, doi:10.3762/bjnano.10.10

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  • , 7000 Mons, Belgium Physics Department & Center for Environmental and Smart Technology (CEST), Faculty of Science, Fayoum University, Fayoum, Egypt 10.3762/bjnano.10.10 Abstract In this work, we investigated the parameters for decorating multiwalled carbon nanotubes with iron oxide nanoparticles using
  • by selecting the appropriate ratio of carbon nanotubes/iron salt, while nanoparticle size can be modulated by controlling the calcination period. Pristine and iron-decorated carbon nanotubes were deposited on silicon substrates to investigate their gas sensing properties. It was found that loading
  • with iron oxide nanoparticles substantially ameliorated the response towards nitrogen dioxide. Keywords: benzene detection; doping; gas sensor; metal nanoparticle decoration; multiwalled carbon nanotubes; NO2 detection; room temperature gas sensing; surface modification; Introduction Carbon nanotubes
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Published 09 Jan 2019

Graphene–graphite hybrid epoxy composites with controllable workability for thermal management

  • Idan Levy,
  • Eyal Merary Wormser,
  • Maxim Varenik,
  • Matat Buzaglo,
  • Roey Nadiv and
  • Oren Regev

Beilstein J. Nanotechnol. 2019, 10, 95–104, doi:10.3762/bjnano.10.9

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  • TC enhancement, although at high loading [14][15]. Some graphitic fillers have theoretical TC values of up to several thousands of W/(m∙K) [16][17], making them natural candidates for use in TIMs. Within the group of graphitic fillers, it seemed likely that carbon nanotubes (CNTs) would be suitable
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Published 08 Jan 2019

Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes

  • Mateusz Mrukiewicz,
  • Krystian Kowiorski,
  • Paweł Perkowski,
  • Rafał Mazur and
  • Małgorzata Djas

Beilstein J. Nanotechnol. 2019, 10, 71–78, doi:10.3762/bjnano.10.7

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  • composites [11][12][13][14]. NLCs doped with graphene or carbon nanotubes show a faster response in electro-optical switching than pure liquid crystal compounds. This effect is caused by trapping of some free ion concentrations [15][16] or reduction in the rotational viscosity [17]. Furthermore, due to
  • strong π–π electron stacking of liquid crystal molecules on graphene sheets, one obtains pseudo-nematic domains [18], which enhance the electric anisotropy in the nematic phase. Carbon nanotubes doped into the nematic liquid crystal can effectively reduce the driving voltage due to the increase of the
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Published 07 Jan 2019

Co-intercalated layered double hydroxides as thermal and photo-oxidation stabilizers for polypropylene

  • Qian Zhang,
  • Qiyu Gu,
  • Fabrice Leroux,
  • Pinggui Tang,
  • Dianqing Li and
  • Yongjun Feng

Beilstein J. Nanotechnol. 2018, 9, 2980–2988, doi:10.3762/bjnano.9.277

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  • functional additives have attracted increasing attention for their wide applications in polymers [7]. Organic anti-aging species have been immobilized onto inorganic supports (e.g., carbon nanotubes, SiO2, graphene oxide) to produce inorganic–organic composites with higher migration resistance [8][9][10
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Published 05 Dec 2018

The effect of flexible joint-like elements on the adhesive performance of nature-inspired bent mushroom-like fibers

  • Elliot Geikowsky,
  • Serdar Gorumlu and
  • Burak Aksak

Beilstein J. Nanotechnol. 2018, 9, 2893–2905, doi:10.3762/bjnano.9.268

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  • carbon nanotubes [24][25][26] and stiff thermoplastic materials [27]. On the other hand, micrometer-scale fibers (i.e., fibers with diameter larger than 5 µm) do not adhere even to smooth surfaces as they lack the necessary contact compliance [28]. Composite fibers where the tip is softer than the stalk
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Published 19 Nov 2018

Charged particle single nanometre manufacturing

  • Philip D. Prewett,
  • Cornelis W. Hagen,
  • Claudia Lenk,
  • Steve Lenk,
  • Marcus Kaestner,
  • Tzvetan Ivanov,
  • Ahmad Ahmad,
  • Ivo W. Rangelow,
  • Xiaoqing Shi,
  • Stuart A. Boden,
  • Alex P. G. Robinson,
  • Dongxu Yang,
  • Sangeetha Hari,
  • Marijke Scotuzzi and
  • Ejaz Huq

Beilstein J. Nanotechnol. 2018, 9, 2855–2882, doi:10.3762/bjnano.9.266

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  • literature including EUV mask repair [89], cutting of nanotubes [90] and etching of holes in thin films. In this review we enumerate the major contributions in high-resolution EBIE which, although relatively few in number, clearly demonstrate the potential of the technique. The fabrication of nanopores, for
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Published 14 Nov 2018

Controlling surface morphology and sensitivity of granular and porous silver films for surface-enhanced Raman scattering, SERS

  • Sherif Okeil and
  • Jörg J. Schneider

Beilstein J. Nanotechnol. 2018, 9, 2813–2831, doi:10.3762/bjnano.9.263

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  • ][27][28][29][30][31][32][33][34]. Additional methods appeared in which nanoparticles or metal films are deposited on structured substrates as carbon nanotubes [35][36][37][38][39], graphene foam [40], nanorod or nanopillar arrays [41][42], biological scaffolds [43][44], black silicon [45][46
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Published 07 Nov 2018

Accurate control of the covalent functionalization of single-walled carbon nanotubes for the electro-enzymatically controlled oxidation of biomolecules

  • Naoual Allali,
  • Veronika Urbanova,
  • Mathieu Etienne,
  • Xavier Devaux,
  • Martine Mallet,
  • Brigitte Vigolo,
  • Jean-Joseph Adjizian,
  • Chris P. Ewels,
  • Sven Oberg,
  • Alexander V. Soldatov,
  • Edward McRae,
  • Yves Fort,
  • Manuel Dossot and
  • Victor Mamane

Beilstein J. Nanotechnol. 2018, 9, 2750–2762, doi:10.3762/bjnano.9.257

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  • Strasbourg 7177 10.3762/bjnano.9.257 Abstract Single-walled carbon nanotubes (SWCNTs) were functionalized by ferrocene through ethyleneglycol chains of different lengths (FcETGn) and the functionalized SWCNTs (f-SWCNTs) were characterized by different complementary analytical techniques. In particular, high
  • activity is not jeopardized. Keywords: biosensing; carbon nanotubes; covalent functionalization; electrocatalysis; ferrocene; Introduction Carbon nanotubes (CNTs) have been recognized as interesting candidates for developing electrochemical sensors for almost two decades [1][2][3]. They have been used to
  • sidewalls. In the literature, this is often done by heating under reflux the CNT sample in a strong acidic medium for several hours or days. Doing so, many oxidized functions are introduced but the nanotubes are also cut and shortened. Since we intended to retain the essential electronic properties of the
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Published 26 Oct 2018

Oriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared

  • Pavel Loiko,
  • Tanujjal Bora,
  • Josep Maria Serres,
  • Haohai Yu,
  • Magdalena Aguiló,
  • Francesc Díaz,
  • Uwe Griebner,
  • Valentin Petrov,
  • Xavier Mateos and
  • Joydeep Dutta

Beilstein J. Nanotechnol. 2018, 9, 2730–2740, doi:10.3762/bjnano.9.255

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  • ” saturable absorbers (SAs) for lasers operating in the passively Q-switched (PQS) and mode-locked regimes. These include carbon nanostructures (e.g., graphene, graphene oxide, graphite nanoparticles, single-walled carbon nanotubes (SWCNTs)) [12][13][14][15], few-layer transition metal dichalcogenides (TMDs
  • under ns-laser excitation [23]. This effect was ascribed to the defects promoted by the Mn2+ doping. Some studies revealed reverse saturable absorption (optical limiting) in ZnO thin films and NRs [24]. Zhu et al. studied ultrafast saturable absorption of multiwalled carbon nanotubes (MWCNTs) on quartz
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Published 23 Oct 2018

Impact of the anodization time on the photocatalytic activity of TiO2 nanotubes

  • Jesús A. Díaz-Real,
  • Geyla C. Dubed-Bandomo,
  • Juan Galindo-de-la-Rosa,
  • Luis G. Arriaga,
  • Janet Ledesma-García and
  • Nicolas Alonso-Vante

Beilstein J. Nanotechnol. 2018, 9, 2628–2643, doi:10.3762/bjnano.9.244

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  • Columbia, V6T 1Z4, Canada 10.3762/bjnano.9.244 Abstract Titanium oxide nanotubes (TNTs) were anodically grown in ethylene glycol electrolyte. The influence of the anodization time on their physicochemical and photoelectrochemical properties was evaluated. Concomitant with the anodization time, the NT
  • photooxidation of methylene blue. Keywords: fluorine doping; nanotubes; photocatalytic activity; photoelectrochemistry; titanium(IV) oxide (TiO2); Introduction TiO2 started to attract great interest after Fujishima and Honda reported [1] on its photoelectrochemical (PEC) properties in 1972. Numerous features
  • synthesis methods resulting in a wide range of morphologies, such as mesoporous structures [4], microtubes [5], microdendrites, nanoparticles [6][7][8], nanorods [9][10], nanotubes [11][12][13], nanowires [14], and nanosheets [15][16]. Standing out from the rest of the synthesis techniques, electrochemical
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Published 04 Oct 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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  • graphitic carbon nitride [2][3], carbon nanodots [4], and two-dimensional carbon-based nanocomposites [5][6][7] are a few trending nanomaterials that have already found extensive applications in both environmental remediation and energy generation. In the past, carbon nanotubes (CNTs) have received a great
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Published 19 Sep 2018

ZnO-nanostructure-based electrochemical sensor: Effect of nanostructure morphology on the sensing of heavy metal ions

  • Marina Krasovska,
  • Vjaceslavs Gerbreders,
  • Irena Mihailova,
  • Andrejs Ogurcovs,
  • Eriks Sledevskis,
  • Andrejs Gerbreders and
  • Pavels Sarajevs

Beilstein J. Nanotechnol. 2018, 9, 2421–2431, doi:10.3762/bjnano.9.227

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  • , nanostructures of ZnO were synthesized in four different morphologies: nanorods, nanoneedles, nanotubes and nanoplates. To determine the peculiarities of adsorption for each morphology, a series of electrochemical measurements were carried out using these nanostructured ZnO coatings on the working electrodes
  • , using aqueous solutions of Pb(NO3)2 and Cd(NO3)2 as analytes with different concentrations. It was found that the sensitivity of the resulting electrochemical sensors depends on the morphology of the ZnO nanostructures: the best results were achieved in the case of porous nanostructures (nanotubes and
  • obtaining ZnO nanostructures in various morphologies, such as ZnO nanoneedles, nanorods, nanotubes, nanoplates, etc. Also the purpose of our previous research was to identify optimal growth parameters for obtaining a homogeneous, dense, well-aligned nanostructured ZnO coating with good adhesion to hard
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Published 11 Sep 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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  • , and larger surface-to-volume ratio [34]. The large surface-area-to-volume ratio of nanofibers (NFs), hollow nanofibers (HNFs), nanotubes (NTs) and nanowires (NWs) with micro/mesoporous surfaces results in improved adsorption and better reaction kinetics of gas-sensitive materials. Nanofibers can be
  • with a W precursor and poly(vinyl pyrrolidone) was produced and a mineral oil was used to define the core. The PS particles and mineral oil are later removed by calcination. A schematic diagram of the electrospinning setup and resulting nanotubes are shown in Figure 6. Fan et al. [76] developed a new
  • nanotubes (NTs) in a single capillary electrospinning process by changing the heating rate during the calcination process [79]. Similarly, In2O3 NFs are converted into nanoribbons (NRbs) by changing the experimental parameters [80]. The rapid evaporation of solvent and the concentration of the precursor are
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Published 13 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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  • carbon nanotubes since the 1990’s and of graphene ten years later prompted the development of novel nanotechnologies. We review this topic linking fundamental surface science to the field of catalysis giving a timely picture of the state of the art. The main scientific questions that material scientists
  • have addressed in the last decades are described, in particular the enduring debate on the role of the different nitrogen functionalities in the catalytic activity of nitrogen-doped carbon nanotubes and graphene. Keywords: catalysis; carbon nanotubes; graphene; metal-free; nitrogen doping
  • -free catalyst for the ORR had not been considered feasible [9][10] until two fundamental milestones had risen the interest on carbon as an effective replacement of Pt for catalysis. The first one was the prediction of the remarkable electrical conducting properties of carbon nanotubes (CNTs) in 1993
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Published 18 Jul 2018

Recent highlights in nanoscale and mesoscale friction

  • Andrea Vanossi,
  • Dirk Dietzel,
  • Andre Schirmeisen,
  • Ernst Meyer,
  • Rémy Pawlak,
  • Thilo Glatzel,
  • Marcin Kisiel,
  • Shigeki Kawai and
  • Nicola Manini

Beilstein J. Nanotechnol. 2018, 9, 1995–2014, doi:10.3762/bjnano.9.190

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Published 16 Jul 2018

Defect formation in multiwalled carbon nanotubes under low-energy He and Ne ion irradiation

  • Santhana Eswara,
  • Jean-Nicolas Audinot,
  • Brahime El Adib,
  • Maël Guennou,
  • Tom Wirtz and
  • Patrick Philipp

Beilstein J. Nanotechnol. 2018, 9, 1951–1963, doi:10.3762/bjnano.9.186

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  • Department, Luxembourg Institute of Science and Technology, 41 rue du Brill, L-4422 Belvaux, Luxembourg 10.3762/bjnano.9.186 Abstract The mechanical, structural, electronic and magnetic properties of carbon nanotubes can be modified by electron or ion irradiation. In this work we used 25 keV He+ and Ne+ ion
  • irradiation to study the influence of fluence and sample thickness on the irradiation-induced damage of multiwalled carbon nanotubes (MWCNTs). The irradiated areas have been characterised by correlative Raman spectroscopy and TEM imaging. In order to preclude the Raman contribution coming from the amorphous
  • to differences in stopping power and sputter behaviour. Keywords: carbon nanotubes; helium ion microscope; ion irradiation; Raman; simulations; Introduction Carbon nanotubes (CNTs) have been investigated intensively due to their excellent properties [1]. Modifying and tuning them by electron or ion
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Published 09 Jul 2018

Improving the catalytic activity for hydrogen evolution of monolayered SnSe2(1−x)S2x by mechanical strain

  • Sha Dong and
  • Zhiguo Wang

Beilstein J. Nanotechnol. 2018, 9, 1820–1827, doi:10.3762/bjnano.9.173

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  • the electronic properties of the catalyst, they will affect the catalytic behaviour. Several TMD alloy systems have been investigated as catalysts for HER, including Mo1−xWxSe2 nanoflowers [44], WS2(1−x)Se2x nanotubes [45] and MoS2(1−x)Se2x nanobelts [46]. It was reported that alloying provides an
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Published 18 Jun 2018

A visible-light-controlled platform for prolonged drug release based on Ag-doped TiO2 nanotubes with a hydrophobic layer

  • Caihong Liang,
  • Jiang Wen and
  • Xiaoming Liao

Beilstein J. Nanotechnol. 2018, 9, 1793–1801, doi:10.3762/bjnano.9.170

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  • -layer titania nanotubes (TNTs) fabricated using by an in situ voltage up-anodization process. The visible-light photocatalytic activity is improved by loading Ag onto the TNTs by NaBH4 reduction. Then, the TNTs containing Ag nanoparticles were modified with dodecanethiol (NDM) to create a hydrophobic
  • exhibit promising application as a localized, prolonged drug delivery platform. Keywords: Ag doping; drug delivery; hydrophobic layer; prolonged drug release; TiO2 nanotubes; visible-light-controlled release; Introduction Titanium dioxide nanotubes (TNTs) are often employed as drug carriers, owing to
  • pH [17][18][19], illumination [14][19], ionic strength [20][21], and temperature [22][23][24]. Song et al. [14] fabricated an amphiphilic TNT structure to control the release of drugs. By using the hydrophobic organic portion to decorate the upper layer, nanotubes could hinder the hydrophilic liquid
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Published 14 Jun 2018

SO2 gas adsorption on carbon nanomaterials: a comparative study

  • Deepu J. Babu,
  • Divya Puthusseri,
  • Frank G. Kühl,
  • Sherif Okeil,
  • Michael Bruns,
  • Manfred Hampe and
  • Jörg J. Schneider

Beilstein J. Nanotechnol. 2018, 9, 1782–1792, doi:10.3762/bjnano.9.169

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  • .9.169 Abstract Owing to their high stability against corrosive gases, carbon-based adsorbents are preferentially used for the adsorptive removal of SO2. In the present study, SO2 adsorption on different carbon nanomaterials namely carbon nanohorns (CNHs), multiwalled carbon nanotubes (MWNTs), single
  • -walled carbon nanotubes (SWNTs) and vertically aligned carbon nanotubes (VACNTs) are investigated and compared against the adsorption characteristics of activated carbon and graphene oxide (GO). A comprehensive overview of the adsorption behavior of this family of carbon adsorbents is given for the first
  • found to dominate the adsorption behavior in activated carbon, SO2 adsorption on carbon nanomaterials occurs by a physisorption mechanism. Keywords: adsorption; carbon nanohorns; carbon nanotubes; heat of adsorption; sulfur dioxide; vertically aligned carbon nanotubes; Introduction Compared to the
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Published 13 Jun 2018

Toward the use of CVD-grown MoS2 nanosheets as field-emission source

  • Geetanjali Deokar,
  • Nitul S. Rajput,
  • Junjie Li,
  • Francis Leonard Deepak,
  • Wei Ou-Yang,
  • Nicolas Reckinger,
  • Carla Bittencourt,
  • Jean-Francois Colomer and
  • Mustapha Jouiad

Beilstein J. Nanotechnol. 2018, 9, 1686–1694, doi:10.3762/bjnano.9.160

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  • displays, X-ray sources and cold-cathode electron sources [2]. 1D and 2D materials such as carbon nanotubes [3], ZnO nanorods [1], LaB6 nanowires [2], SnS2 nanosheets (NSs) [4], vertically aligned graphene [5], WS2 nanotubes [6], MoSe2 nanosheets [7], and MoS2 NSs [8][9][10] are potential field-emitter
  • ][12], and comparable with the vertically aligned MoS2 NSs with ultrathin edges in [9] (Table 1). It has been shown previously that vertically grown 1D nanowires/nanotubes and 2D NSs with atomically thin edges may considerably improve the FE properties, so that vertically standing materials are
  • layered nanomaterials. A similar effect has been observed previously in carbon nanotubes [33]. The emission current density versus time plot is shown in Figure 6b. An almost stable (fluctuations between 10 and 20 µA/cm2) emission over a period of 100 min without any measurable degradation can be seen. The
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Published 07 Jun 2018

Nitrogen-doped carbon nanotubes coated with zinc oxide nanoparticles as sulfur encapsulator for high-performance lithium/sulfur batteries

  • Yan Zhao,
  • Zhengjun Liu,
  • Liancheng Sun,
  • Yongguang Zhang,
  • Yuting Feng,
  • Xin Wang,
  • Indira Kurmanbayeva and
  • Zhumabay Bakenov

Beilstein J. Nanotechnol. 2018, 9, 1677–1685, doi:10.3762/bjnano.9.159

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  • carbon nanotubes coated with zinc oxide nanoparticles (ZnO@NCNT) were prepared via a sol–gel route as sulfur encapsulator for lithium/sulfur (Li/S) batteries. The electrochemical properties of the S/ZnO@NCNT composite cathode were evaluated in Li/S batteries. It delivered an initial capacity of 1032
  • ” or ”confine” the S atoms in the cathode, and, therefore, reduce any losses of S. As an excellent conductive agent, carbon-based materials, e.g., carbon black, graphene and carbon nanotubes (CNTs), have been widely used in Li/S composite cathode materials [3]. In addition, by doping with N and a
  • this work, we synthesized nanocomposites of zinc oxide-coated nitrogen-doped carbon nanotubes with sulfur (S/ZnO@NCNT). ZnO was chosen because it is cheap, non-toxic and stable [14][15]. More importantly, ZnO demonstrates a strong affinity to polysulfides. In addition, NCNT was used due to its good
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Published 06 Jun 2018

Sheet-on-belt branched TiO2(B)/rGO powders with enhanced photocatalytic activity

  • Huan Xing,
  • Wei Wen and
  • Jin-Ming Wu

Beilstein J. Nanotechnol. 2018, 9, 1550–1557, doi:10.3762/bjnano.9.146

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  • common but still draws much attention. Many types of TiO2(B) nanostructures have been synthesized, such as nanowires [9][10], nanotubes [11], nanobelts [12][13][14], nanofibers [15] and nanosheets [16]. TiO2(B) is mostly used in lithium-ion batteries due to its relatively open crystal structure, superior
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Published 24 May 2018

Photoluminescence of CdSe/ZnS quantum dots in nematic liquid crystals in electric fields

  • Margarita A. Kurochkina,
  • Elena A. Konshina and
  • Daria Khmelevskaia

Beilstein J. Nanotechnol. 2018, 9, 1544–1549, doi:10.3762/bjnano.9.145

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  • fields. The control of the QD luminescence in an LC matrix has both scientific and practical interest. The photoluminescence (PL) of liquid crystals doped with silver NPs, carbon nanotubes and quantum semiconductor nanoparticles were discussed in [11][12]. The control of PL of a nematic liquid crystal
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Published 23 May 2018

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

  • Rashmi Acharya,
  • Brundabana Naik and
  • Kulamani Parida

Beilstein J. Nanotechnol. 2018, 9, 1448–1470, doi:10.3762/bjnano.9.137

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  • six sections. The optical and electrochemical characteristics of modified TiO2 photocatalysts are discussed in the first section. In the second section, we have reviewed how carbon-based advanced materials like reduced graphene oxide (RGO), carbon nanotubes (CNTs) and carbon dots (CDs) improve the
  • (e.g., MFe2O4) results in a smaller arc radius of the Nyquist plot, as shown in Figure 6, and hence, better charge transport is observed [97]. Modification of TiO2 with carbon-based advanced materials Advanced carbon nanomaterials, such as graphene and its derivatives, carbon nanotubes (CNTs) and
  • core–shell nanotubes exhibited higher Cr(VI) oxyanion reduction and adsorption. The activity could be varied with concentration, pH and dopant acid [133]. Graphene-wrapped differently faceted (001 and 101) TiO2 hollow-core–shell microspheres (TGHMs) have been fabricated by Liu et al. and were applied
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Published 16 May 2018

Interplay between pairing and correlations in spin-polarized bound states

  • Szczepan Głodzik,
  • Aksel Kobiałka,
  • Anna Gorczyca-Goraj,
  • Andrzej Ptok,
  • Grzegorz Górski,
  • Maciej M. Maśka and
  • Tadeusz Domański

Beilstein J. Nanotechnol. 2018, 9, 1370–1380, doi:10.3762/bjnano.9.129

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  • quantum defects involving their intrinsic spins can couple them ferromagnetically. This can be used (e.g., in metallic carbon nanotubes) for a robust transmission of magnetic information over large distances. In all cases the bound YSR states are also sensitive to interactions. One of them is the spin
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Published 07 May 2018
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