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Search for "nanocrystals" in Full Text gives 272 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Photocatalytic and adsorption properties of TiO2-pillared montmorillonite obtained by hydrothermally activated intercalation of titanium polyhydroxo complexes

  • Mikhail F. Butman,
  • Nikolay L. Ovchinnikov,
  • Nikita S. Karasev,
  • Nataliya E. Kochkina,
  • Alexander V. Agafonov and
  • Alexandr V. Vinogradov

Beilstein J. Nanotechnol. 2018, 9, 364–378, doi:10.3762/bjnano.9.36

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  • crystallinity (nanocrystals) representing a mixture of anatase and rutile phases. The structures exhibit improved adsorption and photocatalytic activity as a result of hydrothermally activated intercalation of titanium polyhydroxo complexes (i.e., TiCl4 hydrolysis products) in a solution with a concentration
  • , consists in carrying out a reaction of exchanging the interlayer cations of MM for positively charged titanium polyhydroxo complexes or TiO2 sol particles and subsequent thermal treatment to yield metal oxide nanocrystals (pillars) in the interlayer space of MM [3][5]. Pillarization of MM results in an
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Published 31 Jan 2018

Nanoparticle delivery to metastatic breast cancer cells by nanoengineered mesenchymal stem cells

  • Liga Saulite,
  • Karlis Pleiko,
  • Ineta Popena,
  • Dominyka Dapkute,
  • Ricardas Rotomskis and
  • Una Riekstina

Beilstein J. Nanotechnol. 2018, 9, 321–332, doi:10.3762/bjnano.9.32

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  • nanoparticle transfer between stromal and cancer cells in close spatial proximity. QDs are semiconductor nanocrystals with improved light emission, signal brightness, and resistance to photobleaching, thus making them a suitable imaging agent for the modelling of nanoparticle transfer [22]. The aim of the
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Published 29 Jan 2018

Co-reductive fabrication of carbon nanodots with high quantum yield for bioimaging of bacteria

  • Jiajun Wang,
  • Xia Liu,
  • Gesmi Milcovich,
  • Tzu-Yu Chen,
  • Edel Durack,
  • Sarah Mallen,
  • Yongming Ruan,
  • Xuexiang Weng and
  • Sarah P. Hudson

Beilstein J. Nanotechnol. 2018, 9, 137–145, doi:10.3762/bjnano.9.16

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  • medicine. Within this class of materials, carbon nanodots (C-dots) are deemed a major breakthrough for the development of fluorescent nanomaterials. They are a promising alternative to fluorescent inorganic semiconductor nanocrystals and organic dyes due to their chemical stability, good dispersibility in
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Published 12 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

Graphical Abstract
  • , the post-growth annealing results differed. Cu-containing deposits showed the formation of pure Cu nanocrystals at the outer surface of the initial deposit for temperatures above 100 °C, due to the migration of Cu atoms from the carbonaceous matrix containing carbon, oxygen, and fluorine atoms. The
  • 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
  • disordered carbon band, D (1350 cm−1), as well as the graphitic band, G (1580 cm−1). Partial thermally-induced conversion of an amorphous carbon matrix into graphite nanocrystals in the FEBID material is indicated through (d) the shift of the G band peak position as a function of annealing temperature, as
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Published 09 Jan 2018

Growth model and structure evolution of Ag layers deposited on Ge films

  • Arkadiusz Ciesielski,
  • Lukasz Skowronski,
  • Ewa Górecka,
  • Jakub Kierdaszuk and
  • Tomasz Szoplik

Beilstein J. Nanotechnol. 2018, 9, 66–76, doi:10.3762/bjnano.9.9

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  • [15], and for thicker layers, the height of the nanocrystals may be even greater. In a recent work [4], we have modeled a 35 nm thick silver layer with a smooth surface to determine its optical parameters and we had a good agreement with the experimental data, therefore, we can assume that such a
  • structure of the silver layer grown on Ge wetting film is illustrated in Figure 4. Large and flat nanocrystals are formed at the SiO2/Ge/Ag interface, and the in-plane grain size decreases with increasing vertical distance from the silica substrate. Decreasing size of Ag grains with growing distance from
  • the substrate explains why the segregation of germanium in the silver structure occurs at an increasing rate. Ge atoms present in the boundaries of smaller nanocrystals have more neighboring crystals, what lowers the free enthalpy of such atoms. The opposite process, i.e., migration of Ge atoms from
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Published 08 Jan 2018

A robust AFM-based method for locally measuring the elasticity of samples

  • Alexandre Bubendorf,
  • Stefan Walheim,
  • Thomas Schimmel and
  • Ernst Meyer

Beilstein J. Nanotechnol. 2018, 9, 1–10, doi:10.3762/bjnano.9.1

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  • ]. In physics, the band gap size of nanocrystals and the presence of planar defects on nanotubes are a function of the Young’s modulus [2][3]. Probing local elasticity requires an instrumentation capable of operating with high resolution and under different conditions, such as variable temperature
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Published 02 Jan 2018

CdSe nanorod/TiO2 nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

  • Fakher Laatar,
  • Hatem Moussa,
  • Halima Alem,
  • Lavinia Balan,
  • Emilien Girot,
  • Ghouti Medjahdi,
  • Hatem Ezzaouia and
  • Raphaël Schneider

Beilstein J. Nanotechnol. 2017, 8, 2741–2752, doi:10.3762/bjnano.8.273

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  • eV) and its band energies are located at relatively low potential. Despite the large number of reports describing the sensitization of TiO2 (used in the form of spherical particles, films, wires, tubes, etc.) with CdSe nanocrystals (generally quantum dots or spherical nanoclusters) [9][10][11][12][13
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Published 19 Dec 2017

The role of ligands in coinage-metal nanoparticles for electronics

  • Ioannis Kanelidis and
  • Tobias Kraus

Beilstein J. Nanotechnol. 2017, 8, 2625–2639, doi:10.3762/bjnano.8.263

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  • authors suggest that growth was controlled by the different binding affinities of the ligands to the gold atoms (COOH < NH2 < SH) that changed the interfacial energy between core and shell, resulting in different crystal growth modes [72]. Jin et al. controlled the shape of copper nanocrystals using
  • substituents (Me, MeO, Cl, or Br) in para-position to the thiol group reduced the conductivity compared to films of triphenylphosphine (PPh3) (Figure 3) and thiophenol (H)-capped gold nanocrystals. The electron-withdrawing nitro group (NO2) caused an increase in conductivity from 30 S/cm (PPh3-capped Au NPs
  • . Dodecylamine-functionalized Ag NPs were printed on polymers and reached a conductivity of 1205 S/cm after sintering at 140 °C [126]. Metal-chalcogenide complexes are a carbon-free alternative to stabilize nanocrystals in polar solvents such as dimethylformamide or methanol. Their use avoids undesired carbon
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Published 07 Dec 2017

PTFE-based microreactor system for the continuous synthesis of full-visible-spectrum emitting cesium lead halide perovskite nanocrystals

  • Chengxi Zhang,
  • Weiling Luan,
  • Yuhang Yin and
  • Fuqian Yang

Beilstein J. Nanotechnol. 2017, 8, 2521–2529, doi:10.3762/bjnano.8.252

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  • , Lexington, KY 40506, USA 10.3762/bjnano.8.252 Abstract Colloidal perovskite nanocrystals comprised of all inorganic cesium lead halide (CsPbX3, X = Cl, Br, I or a mixture thereof) have potential as optical gain materials due to their high luminescence efficiency. In this work, cesium lead halide
  • nanocrystals are continuously synthesized via a microreactor system consisting of poly(tetrafluoroethylene) (PTFE) capillaries. The synthesized nanocrystals possess excellent optical properties, including a full width at half maximum of 19–35 nm, high fluorescence quantum yield of 47.8–90.55%, and
  • photoluminescence emission in the range of 450–700 nm. For the same precursor concentrations, the photoluminescence emission peak generally increases with increasing reaction temperature, revealing a controllable temperature effect on the photoluminescence characteristics of the synthesized nanocrystals. For
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Published 28 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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  • heat treatment, and the resultant sample exhibited enhanced catalytic activity in the oxidation of CO [25]. Otherwise, as a special composite structure, heterogeneous core@shell structures are believed to integrate the function of individual nanocrystals and induce the unique synergetic catalytic
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Published 16 Nov 2017

Changes of the absorption cross section of Si nanocrystals with temperature and distance

  • Michael Greben,
  • Petro Khoroshyy,
  • Sebastian Gutsch,
  • Daniel Hiller,
  • Margit Zacharias and
  • Jan Valenta

Beilstein J. Nanotechnol. 2017, 8, 2315–2323, doi:10.3762/bjnano.8.231

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  • of Sciences, Flemingovo namesti 2, 160 00 Prague 6, Czech Republic Faculty of Engineering, IMTEK, Albert-Ludwigs-University Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany 10.3762/bjnano.8.231 Abstract The absorption cross section (ACS) of silicon nanocrystals (Si NCs) in single-layer
  • Si NCs cannot be considered as independent on experimental conditions and sample parameters. Keywords: absorption cross section; average lifetime; nanocrystal distance; photoluminescence decay; silicon nanocrystals; Introduction For decades, silicon – an abundant, nontoxic material with high
  • silicon, which reveals all advantages of the quantum confinement effect [1], is a promising candidate for the development of a new generation of Si photovoltaic and photonic devices [2]. SiO2-embedded silicon nanocrystals (Si NCs) can be relatively easy integrated into current CMOS technology. In
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Published 06 Nov 2017

Hydrothermal synthesis of ZnO quantum dot/KNb3O8 nanosheet photocatalysts for reducing carbon dioxide to methanol

  • Xiao Shao,
  • Weiyue Xin and
  • Xiaohong Yin

Beilstein J. Nanotechnol. 2017, 8, 2264–2270, doi:10.3762/bjnano.8.226

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  • particle diameter is about 25 nm) in the degradation of rhodamine B, but also a higher generating rate of H2 at 3.0 mmol/h under UV-light irradiation [11]. Song prepared nanocrystals of ferroelectric NaNbO3 phase by a hydrothermal method using Nb2O5 and NaOH as precursors in one step, where a lower
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Published 30 Oct 2017

Ta2N3 nanocrystals grown in Al2O3 thin layers

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

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

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  • -Sincrotrone Trieste, Strada Statale 14, km 163.5, I-34149 Basovizza (TS), Italy 10.3762/bjnano.8.215 Abstract Tantalum nitride nanoparticles (NPs) and cubic bixbyite-type Ta2N3 nanocrystals (NCs) were grown in (Ta–N+Al2O3)/Al2O3 periodic multilayers (MLs) after thermal treatment. The MLs were prepared by
  • generic procedure to realize highly tunable and designable optical properties of thin films containing transition-metal nitride nanocrystals. Keywords: nanocomposites; multilayers; refractory plasmonics; self-assembly; Ta2N3 nanoparticles; Introduction Metallic nanoparticles (NPs) can confine visible
  • nitride NPs could be confined within the metallic layers. Here we tested the feasibility of this procedure with the tantalum nitride (Ta–N) system, more specifically with the cubic bixbyite type (space group 206, ) Ta2N3 nanocrystals embedded within the Al2O3 matrix. The Ta–N system has a uniquely rich
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Published 16 Oct 2017

In situ controlled rapid growth of novel high activity TiB2/(TiB2–TiN) hierarchical/heterostructured nanocomposites

  • Jilin Wang,
  • Hejie Liao,
  • Yuchun Ji,
  • Fei Long,
  • Yunle Gu,
  • Zhengguang Zou,
  • Weimin Wang and
  • Zhengyi Fu

Beilstein J. Nanotechnol. 2017, 8, 2116–2125, doi:10.3762/bjnano.8.211

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  • theoretical evidence for the scientific rationality of this new technology, but also further expands the variety of materials available from single inorganic nanocrystals to binary hierarchical/heterostructured nanocomposites. Experimental Reaction coupling principles and the theoretical calculations The
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Published 10 Oct 2017

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

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

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

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  • reaction, leading to finely dispersed metal nanocrystals in a Li2O matrix. This process is associated with large volume changes and also exhibits irreversible phase transformation (from a hexagonal anionic packing to a cubic phase [11]) that causes a poor long-time cycling behavior with severe capacity
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Published 28 Sep 2017

Two-dimensional carbon-based nanocomposites for photocatalytic energy generation and environmental remediation applications

  • Suneel Kumar,
  • Ashish Kumar,
  • Ashish Bahuguna,
  • Vipul Sharma and
  • Venkata Krishnan

Beilstein J. Nanotechnol. 2017, 8, 1571–1600, doi:10.3762/bjnano.8.159

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  • for the synthesis of inorganic nanocrystals and gives rise to highly crystalline nanostructures and also reduces GO to RGO. As the name suggests, water is the main solvent in hydrothermal synthesis method and major advantage of water as the solvent is its abundance in nature as well as its non-toxic
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Published 03 Aug 2017

Cationic PEGylated polycaprolactone nanoparticles carrying post-operation docetaxel for glioma treatment

  • Cem Varan and
  • Erem Bilensoy

Beilstein J. Nanotechnol. 2017, 8, 1446–1456, doi:10.3762/bjnano.8.144

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  • -time and also enhanced the concentration of BCNU in the brain tumor area [27]. In addition to drug delivery, core–shell nanoparticles such as magnetic nanoparticles [28], quantum dots [29], nanodiamonds [30], nanocrystals [31] and iron oxide nanoparticles [32] are studied as imaging and detection
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Published 12 Jul 2017

Charge transport in organic nanocrystal diodes based on rolled-up robust nanomembrane contacts

  • Vineeth Kumar Bandari,
  • Lakshmi Varadharajan,
  • Longqian Xu,
  • Abdur Rehman Jalil,
  • Mirunalini Devarajulu,
  • Pablo F. Siles,
  • Feng Zhu and
  • Oliver G. Schmidt

Beilstein J. Nanotechnol. 2017, 8, 1277–1282, doi:10.3762/bjnano.8.129

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  • Str. 20, 01069 Dresden, Germany 10.3762/bjnano.8.129 Abstract The investigation of charge transport in organic nanocrystals is essential to understand nanoscale physical properties of organic systems and the development of novel organic nanodevices. In this work, we fabricate organic nanocrystal
  • diodes contacted by rolled-up robust nanomembranes. The organic nanocrystals consist of vanadyl phthalocyanine and copper hexadecafluorophthalocyanine heterojunctions. The temperature dependent charge transport through organic nanocrystals was investigated to reveal the transport properties of ohmic and
  • optoelectronics and spintronics [4][5][6]. Organic nanocrystals have drawn much attention in the community because high quality material can be efficiently generated by controlling the nanoscale physical growth and/or chemical synthesis process [7][8][9][10]. The deposition of organic conjugated molecules is
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Published 19 Jun 2017

Evaluation of quantum dot conjugated antibodies for immunofluorescent labelling of cellular targets

  • Jennifer E. Francis,
  • David Mason and
  • Raphaël Lévy

Beilstein J. Nanotechnol. 2017, 8, 1238–1249, doi:10.3762/bjnano.8.125

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  • targets in the cytosol and could not reach the nucleus, even after extensive cell permeabilisation. Keywords: imaging; immunofluorescence; microscopy; nanoparticles; quantum dots; Introduction Quantum dots (Qdots) are nanometre-sized semiconductor nanocrystals that typically consist of a metallic core
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Published 09 Jun 2017

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

  • Rafał Babilas,
  • Dariusz Łukowiec and
  • Laszlo Temleitner

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

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  • modeling methods. The annealing step was conducted to achieve the formation of nanocrystals embedded in an amorphous matrix. The studied alloy is a modification of the chemical composition of a very popular glass (Mg65Cu25Y10) synthesized for the first time by Inoue et al. [13][14]. The samples achieved by
  • calculating the χ2 [23]: where k is intersects the points of the data set. An amorphous structure with nanocrystals was observed using a high-resolution transmission electron microscope S/TEM TITAN 80-300 by FEI. The high-resolution transmission electron microscopy (HRTEM) images, selected area electron
  • (NBED) patterns determined from nanocrystals with a diameter of 150 nm confirmed the formation of the Mg2Cu structure [27]. A comparison of the structural analysis results for Mg60Cu30Y10 [27] and Mg65Cu20Y10Ni5 metallic glasses in the as-cast state confirmed that the atomic model determined from RMC
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Published 31 May 2017

Enhanced catalytic activity without the use of an external light source using microwave-synthesized CuO nanopetals

  • Govinda Lakhotiya,
  • Sonal Bajaj,
  • Arpan Kumar Nayak,
  • Debabrata Pradhan,
  • Pradip Tekade and
  • Abhimanyu Rana

Beilstein J. Nanotechnol. 2017, 8, 1167–1173, doi:10.3762/bjnano.8.118

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  • found to be ≈25.58 m2·g−1 (Supporting Information File 1, Figure S2), which is in good agreement with the preferential growth of nanocrystals along a certain direction with respect to time. As the effective surface area of as-synthesized nanopetals was larger than that of as-synthesized nanoflowers with
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Published 30 May 2017

AgCl-doped CdSe quantum dots with near-IR photoluminescence

  • Pavel A. Kotin,
  • Sergey S. Bubenov,
  • Natalia E. Mordvinova and
  • Sergey G. Dorofeev

Beilstein J. Nanotechnol. 2017, 8, 1156–1166, doi:10.3762/bjnano.8.117

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  • Abstract We report the synthesis of colloidal CdSe quantum dots doped with a novel Ag precursor: AgCl. The addition of AgCl causes dramatic changes in the morphology of synthesized nanocrystals from spherical nanoparticles to tetrapods and finally to large ellipsoidal nanoparticles. Ellipsoidal
  • investigated. The optimal conditions for maximizing both the reaction yield and IR photoluminescence quantum yield are found. Keywords: Ag doping; CdSe quantum dots; doped semiconductor nanocrystals; IR photoluminescence; tetrapods; Introduction Colloidal quantum dots (QDs) have attracted considerable
  • ). Adding silver along with cadmium and selenium during synthesis obliges us to discuss the possibility of the formation of Ag2Se NPs. According to previous investigations, CdSe nanocrystals that were exposed to Ag cations in solution could be completely or partially converted to Ag2Se via cation exchange
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Published 29 May 2017

ZnO nanoparticles sensitized by CuInZnxS2+x quantum dots as highly efficient solar light driven photocatalysts

  • Florian Donat,
  • Serge Corbel,
  • Halima Alem,
  • Steve Pontvianne,
  • Lavinia Balan,
  • Ghouti Medjahdi and
  • Raphaël Schneider

Beilstein J. Nanotechnol. 2017, 8, 1080–1093, doi:10.3762/bjnano.8.110

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  • contain highly toxic elements, which severely restricts their use. In recent years, I–III–VI2 group semiconductors such as CuInS2 (CIS) have emerged as environmentally friendly alternatives to Cd- or Pb-based QDs [20]. CIS QDs can be alloyed with ZnS to generate CuInZnxS2+x (ZCIS) nanocrystals with high
  • composites prepared for the photocatalytic degradation of pollutants require a relatively large quantity of CIS nanocrystals to be complete (20 wt % CIS QDs relative to ZnO) [34][37]. When the ZCIS/ZnO weight ratio was decreased to ≈7%, the photodegradation never exceeded 80% even using a light source
  • as the sulfur source and as the stabilizing ligand for the nanocrystals. A Cu/In ratio of 0.7 was used for the synthesis because Cu-deficient CIS QDs exhibit higher PL quantum yields than those prepared with a stoichiometric Cu/In ratio [43]. To improve the PL efficiency, a ZnS shell was coated on
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Published 17 May 2017

3D Nanoprinting via laser-assisted electron beam induced deposition: growth kinetics, enhanced purity, and electrical resistivity

  • Brett B. Lewis,
  • Robert Winkler,
  • Xiahan Sang,
  • Pushpa R. Pudasaini,
  • Michael G. Stanford,
  • Harald Plank,
  • Raymond R. Unocic,
  • Jason D. Fowlkes and
  • Philip D. Rack

Beilstein J. Nanotechnol. 2017, 8, 801–812, doi:10.3762/bjnano.8.83

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  • metallic nanocrystals suspended in a non-metallic (often carbonaceous) matrix. There are, however, a few documented examples of precursors that produce relatively pure deposits without additional purification steps [40][41][42][43], and there has been a recent thrust to design and evaluate precursors
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Published 07 Apr 2017

Recombinant DNA technology and click chemistry: a powerful combination for generating a hybrid elastin-like-statherin hydrogel to control calcium phosphate mineralization

  • Mohamed Hamed Misbah,
  • Mercedes Santos,
  • Luis Quintanilla,
  • Christina Günter,
  • Matilde Alonso,
  • Andreas Taubert and
  • José Carlos Rodríguez-Cabello

Beilstein J. Nanotechnol. 2017, 8, 772–783, doi:10.3762/bjnano.8.80

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  • high level of control over mineralization [18][19], including the potential to hierarchically generate structured hybrid materials that may, for example, resemble bone tissue [20]. Although extensive research has been conducted on the mineralization field, it is a challenge to integrate CP nanocrystals
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Published 04 Apr 2017
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