Growth, structure and stability of sputter-deposited MoS₂ thin films

• Reinhard Kaindl,
• Bernhard C. Bayer,
• Roland Resel,
• Thomas Müller,
• Viera Skakalova,
• Gerlinde Habler,
• Rainer Abart,
• Alexey S. Cherevan,
• Dominik Eder,
• Maxime Blatter,
• Fabian Fischer,
• Jannik C. Meyer,
• Dmitry K. Polyushkin and
• Wolfgang Waldhauser

Beilstein J. Nanotechnol. 2017, 8, 1115–1126, doi:10.3762/bjnano.8.113

• , Austria Institute of Life Technologies, HES-SO Valais-Wallis, Route du Rawyl 64, CP, 1950 Sion 2, Switzerland 10.3762/bjnano.8.113 Abstract Molybdenum disulphide (MoS2) thin films have received increasing interest as device-active layers in low-dimensional electronics and also as novel catalysts in

• measurements suggest directions for future work on our PVD MoS2 films. Keywords: electrode; hydrogen evolution reaction (HER); magnetron sputter deposition; MoS2; reticulated vitreous carbon (RVC) foam; SiO2/Si substrate; Introduction Molybdenum disulphide (MoS2) is a layered chemical compound comprised of

• amorphous MoS2 films, deposited via simple electro-polymerization procedures, the precatalysts could be MoS3 or MoS2; the active form of the catalysts was identified as amorphous MoS2 [19]. Narrow molybdenum disulfide nanosheets with the edge-terminated structure and a significantly expanded interlayer were

Impact of contact resistance on the electrical properties of MoS₂ transistors at practical operating temperatures

• Filippo Giannazzo,
• Gabriele Fisichella,
• Aurora Piazza,
• Salvatore Di Franco,
• Giuseppe Greco,
• Simonpietro Agnello and
• Fabrizio Roccaforte

Beilstein J. Nanotechnol. 2017, 8, 254–263, doi:10.3762/bjnano.8.28

• , University of Palermo, Via Archirafi 36, 90143 Palermo, Italy Department of Physics and Astronomy, University of Catania, Via Santa Sofia, 64, 95123 Catania, Italy 10.3762/bjnano.8.28 Abstract Molybdenum disulphide (MoS2) is currently regarded as a promising material for the next generation of electronic

Obtaining and doping of InAs-QD/GaAs(001) nanostructures by ion beam sputtering

• Sergei N. Chebotarev,
• Alexander S. Pashchenko,
• Leonid S. Lunin,
• Elena N. Zhivotova,
• Georgy A. Erimeev and
• Marina L. Lunina

Beilstein J. Nanotechnol. 2017, 8, 12–20, doi:10.3762/bjnano.8.2

• targets by molybdenum screens during cleaning. Ion etching was carried out at an energy of 180 eV and with etching rates less than 0.3 ML/s. It was shown in [27] that the incorporation of argon ions in the GaAs wafer was not observed at energies below 200 eV. This technique makes it possible to remove the

A new approach to grain boundary engineering for nanocrystalline materials

• Shigeaki Kobayashi,
• Sadahiro Tsurekawa and
• Tadao Watanabe

Beilstein J. Nanotechnol. 2016, 7, 1829–1849, doi:10.3762/bjnano.7.176

• polycrystalline molybdenum. The generated dislocations can transfer or pass across low-angle boundaries more easily than random boundaries composed of more complicated tilt and twist components at room temperature [72]. It is evident that the grain boundary character can strongly affect the hardness at individual

Fracture behaviors of pre-cracked monolayer molybdenum disulfide: A molecular dynamics study

• Qi-lin Xiong,
• Zhen-huan Li and
• Xiao-geng Tian

Beilstein J. Nanotechnol. 2016, 7, 1411–1420, doi:10.3762/bjnano.7.132

• and Vibration, Xi’an Jiaotong University, Xi’an 710049, China 10.3762/bjnano.7.132 Abstract The fracture strength and crack propagation of monolayer molybdenum disulfide (MoS2) sheets with various pre-existing cracks are investigated using molecular dynamics simulation (MDS). The uniaxial tensions of

• model without finite size effect. Finally, the MDS results of monolayer MoS2 sheets with different angled crack are also analyzed based on the continuum fracture mechanics model. Keywords: crack propagation; fracture strength; molecular dynamics simulation; monolayer molybdenum disulfide; pre-existing

• conductivity of defect-free SLMoS2 by using classical MDS. Dang et al. [16] used MDS with a reactive empirical bond order potential to study the mechanical deformation and failure of monolayer molybdenum disulfide under uniaxial and multiaxial tension. Zhao et al. [17] investigated the influence of temperature

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method

• Marta Yarmolich,
• Nikolai Kalanda,
• Sergey Demyanov,
• Herman Terryn,
• Jon Ustarroz,
• Maksim Silibin and
• Gennadii Gorokh

Beilstein J. Nanotechnol. 2016, 7, 1202–1207, doi:10.3762/bjnano.7.111

• grain size of the powders in the dispersion grows from 250 to 550 nm with increasing pH value. The X-ray diffraction analysis of the powders annealed at different temperatures between 770 and 1270 K showed that the composition of the initially formed Sr2FeMoO6−x changes and the molybdenum content

• nm and a superstructural ordering of iron and molybdenum cations of 88%. Keywords: magnetic materials; microstructure; nanoparticles; phase transformation; sol–gel preparation; Introduction Due to their unique and extremely important magneto-transport and magnetic properties [1][2], metal oxide

• cations (interposition of iron and molybdenum ions relative to each other) [19]. A decrease in the degree of ordering of the superstructure with increasing pH of the solution was observed. Thus, the results of the X-ray analysis have shown that all investigated SFMO powders are single phase, although SFMO

Synthesis and applications of carbon nanomaterials for energy generation and storage

• Marco Notarianni,
• Jinzhang Liu,
• Kristy Vernon and
• Nunzio Motta

Beilstein J. Nanotechnol. 2016, 7, 149–196, doi:10.3762/bjnano.7.17

• of the system (Figure 13) [77]. It should be mentioned that graphene is not the only 2D material today that offers great performance for a wide range of applications [78]. Boron nitride and molybdenum disulfide are examples of other 2D materials that offer the possibility to tune material and device

Enhanced model for determining the number of graphene layers and their distribution from X-ray diffraction data

• Beti Andonovic,
• Abdulakim Ademi,
• Anita Grozdanov,
• Perica Paunović and
• Aleksandar T. Dimitrov

Beilstein J. Nanotechnol. 2015, 6, 2113–2122, doi:10.3762/bjnano.6.216

• solution using a nonstationary current regime (reverse potential, from 1 to 5 V, in molten salt electrolysis, and from 10 to 15 V, in aqueous solution, controlled by a molybdenum quasi-reference electrode and a calomel reference electrode). The study was done at temperatures between 400 and 600 °C in

Biopolymer colloids for controlling and templating inorganic synthesis

• Laura C. Preiss,
• Katharina Landfester and
• Rafael Muñoz-Espí

Beilstein J. Nanotechnol. 2014, 5, 2129–2138, doi:10.3762/bjnano.5.222

• molybdenum oxide clusters, which were shown to be active as catalysts for selective alcohol oxidation. Similarly, Ganesan and Gedanken [74] had prepared tungsten(VI) oxide nanoparticles through the encapsulation of ammonium metatungstate on chitosan and the subsequent calcination. These particles showed a

Liquid fuel cells

• Grigorii L. Soloveichik

Beilstein J. Nanotechnol. 2014, 5, 1399–1418, doi:10.3762/bjnano.5.153

• alloy increases the reaction rate by more than one order of magnitude compared to pure Pt supposedly due to the formation of hydrous molybdenum oxide that reduces the surface poisoning by adsorbed CO [130]. Palladium-based electrocatalysts deliver higher power densities compared to platinum-based ones

Magnesium batteries: Current state of the art, issues and future perspectives

• Rana Mohtadi and
• Fuminori Mizuno

Beilstein J. Nanotechnol. 2014, 5, 1291–1311, doi:10.3762/bjnano.5.143

Sublattice asymmetry of impurity doping in graphene: A review

• James A. Lawlor and
• Mauro S. Ferreira

Beilstein J. Nanotechnol. 2014, 5, 1210–1217, doi:10.3762/bjnano.5.133

• more recent studies suggest that this could also be possible with other impurities [43]. Whilst it is known experimentally that molybdenum impurities exhibit same sublattice configurations in bilayer epitaxial graphene, the mechanism behind this is not currently understood [60]. Boron has been studied

Fringe structures and tunable bandgap width of 2D boron nitride nanosheets

• Peter Feng,
• Muhammad Sajjad,
• Eric Yiming Li,
• Hongxin Zhang,
• Jin Chu,
• Ali Aldalbahi and
• Gerardo Morell

Beilstein J. Nanotechnol. 2014, 5, 1186–1192, doi:10.3762/bjnano.5.130

• -produced plasma beams. The diameter of the focus spot of laser beam on the target was about 2 mm and could be varied by shifting focal lens. The power density of the laser on the target was 2 × 108 W/cm2 per pulse. Molybdenum (Mo) and silicon (Si) wafers (1 × 1 cm2) as substrates were used and placed 4 cm

Enhanced photocatalytic hydrogen evolution by combining water soluble graphene with cobalt salts

• Jing Wang,
• Ke Feng,
• Hui-Hui Zhang,
• Bin Chen,
• Zhi-Jun Li,
• Qing-Yuan Meng,
• Li-Ping Zhang,
• Chen-Ho Tung and
• Li-Zhu Wu

Beilstein J. Nanotechnol. 2014, 5, 1167–1174, doi:10.3762/bjnano.5.128

• , which limits its availability [5]. Hence, developing photocatalytic systems that rely only on earth-abundant elements are desired for making hydrogen a competitive alternative energy source. In recent years, systems based on iron complexes, nickel complexes or molybdenum complexes have been reported as

Visible light photooxidative performance of a high-nuclearity molecular bismuth vanadium oxide cluster

• Johannes Tucher and
• Carsten Streb

Beilstein J. Nanotechnol. 2014, 5, 711–716, doi:10.3762/bjnano.5.83

• ]. POMs are anionic metal oxide clusters formed primarily from early transition metals, mainly vanadium, molybdenum and tungsten [8]. The cluster assembly proceeds in solution by oligo-condensation reactions between reactive fragments, often by using templates to control the final cluster architecture [9

Towards precise defect control in layered oxide structures by using oxide molecular beam epitaxy

• Federico Baiutti,
• Georg Christiani and
• Gennady Logvenov

Beilstein J. Nanotechnol. 2014, 5, 596–602, doi:10.3762/bjnano.5.70

• conditions (high temperature, strongly oxidizing atmosphere), the materials for each component must be chosen extremely carefully. Materials such as molybdenum or PBN, which are often used in standard MBE, are not applicable in the oxide MBE given their tendency to form volatile oxides. Moreover, in order to

DNA origami deposition on native and passivated molybdenum disulfide substrates

• Xiaoning Zhang,
• Masudur Rahman,
• David Neff and
• Michael L. Norton

Beilstein J. Nanotechnol. 2014, 5, 501–506, doi:10.3762/bjnano.5.58

• prerequisite for the successful fabrication of hybrid DNA origami/semiconductor-based biomedical sensor devices. Molybdenum disulfide (MoS2) is an ideal substrate for such future sensors due to its exceptional electrical, mechanical and structural properties. In this work, we performed the first investigations

• significantly longer times. These findings will be beneficial for the fabrication of future DNA origami/MoS2 hybrid electronic structures. Keywords: atomic force microscopy (AFM); DNA origami; molybdenum disulfide (MoS2); pyrene; 1-pyrenemethylamine; surface modification; Introduction Since it was first

• properties, so as to enable complex and diverse circuit designs, thereby providing functionality essential for the construction of sensing biodevices with extraordinary sensitivity, rapid readout and good stability. As a layered two-dimensional (2D) material, molybdenum disulfide (MoS2) exhibits robust

Effect of contaminations and surface preparation on the work function of single layer MoS₂

• Oliver Ochedowski,
• Kolyo Marinov,
• Nils Scheuschner,
• Artur Poloczek,
• Benedict Kleine Bussmann,
• Janina Maultzsch and
• Marika Schleberger

Beilstein J. Nanotechnol. 2014, 5, 291–297, doi:10.3762/bjnano.5.32

• , two-dimensional materials are being targeted in a variety of research areas like surface physics, electrical engineering, chemistry and biomedical applications [1][2][3][4]. The 2D-material getting the most attention besides graphene are single layers of molybdenum disulfide (SLM) which consist of a

• plane of molybdenum atoms that are sandwiched between sulfur atoms. The main reason for this is the transition from an indirect (bulk MoS2) to a direct (single layer MoS2) band gap semi-conductor [5]. Single layer MoS2 has a strong photoluminescence signal [5][6][7][8][9] and other interesting

The role of oxygen and water on molybdenum nanoclusters for electro catalytic ammonia production

• Jakob G. Howalt and
• Tejs Vegge

Beilstein J. Nanotechnol. 2014, 5, 111–120, doi:10.3762/bjnano.5.11

• , we present theoretical investigations of the influence of oxygen adsorption and reduction on pure and nitrogen covered molybdenum nanocluster electro catalysts for electrochemical reduction of N2 to NH3 with the purpose of understanding oxygen and water poisoning of the catalyst. Density functional

• theory calculations are used in combination with the computational hydrogen electrode approach to calculate the free energy profile for electrochemical protonation of O and N2 species on cuboctahedral Mo13 nanoclusters. The calculations show that the molybdenum nanocluster will preferentially bind oxygen

• electrochemical ammonia production via the associative mechanism is possible at potentials as low as −0.45 V to −0.7 V. Keywords: ammonia; density functional theory; electrocatalysis; nanoparticles; oxygen poisoning; Introduction Molybdenum nanoclusters have been identified as a prime candidate for

Functionalization of vertically aligned carbon nanotubes

• Eloise Van Hooijdonk,
• Carla Bittencourt,
• Rony Snyders and
• Jean-François Colomer

Beilstein J. Nanotechnol. 2013, 4, 129–152, doi:10.3762/bjnano.4.14

• sites), Kim et al. explained the correspondence between (i) the linear behavior of the structural defect density with time and (ii) the exponential behavior of the resistance. This observation is important for different electrical devices. Ye et al. [99] electrodeposited molybdenum oxide (MoOx) on VA

Structural, electronic and photovoltaic characterization of multiwalled carbon nanotubes grown directly on stainless steel

• Luca Camilli,
• Manuela Scarselli,
• Silvano Del Gobbo,
• Paola Castrucci,
• Eric Gautron and
• Maurizio De Crescenzi

Beilstein J. Nanotechnol. 2012, 3, 360–367, doi:10.3762/bjnano.3.42

• Goodfellow Cambridge Ltd.) was placed on a molybdenum sample holder, acting as a resistive heater, and inserted into the chemical vapour deposition chamber (see Figure 1). After air was removed by a rotary pump, argon gas (12 torr) was inserted. When the desired temperature was reached (750 °C) acetylene gas

• . Acetylene and argon fluxes, introduced in the chamber through the gas line highlighted by the arrow, are adjusted by means of two suitable valves. (b) Schematics showing the CVD process: The stainless-steel substrate is mounted on a heatable molybdenum sample holder. After a temperature of 750 °C has been

Femtosecond time-resolved photodissociation dynamics of methyl halide molecules on ultrathin gold films

• Mihai E. Vaida,
• Robert Tchitnga and
• Thorsten M. Bernhardt

Beilstein J. Nanotechnol. 2011, 2, 618–627, doi:10.3762/bjnano.2.65

• molybdenum surface. Mass measurements were carried out on a homebuilt time-of-flight mass spectrometer [18][39]. The grounded Au/Mo(100) substrate served as the repeller electrode of a Wiley–McLaren-type acceleration lens arrangement [41]. The pump and probe laser beams collinearly irradiated the surface at

Investigation on structural, thermal, optical and sensing properties of meta-stable hexagonal MoO₃ nanocrystals of one dimensional structure

• Angamuthuraj Chithambararaj and
• Arumugam Chandra Bose

Beilstein J. Nanotechnol. 2011, 2, 585–592, doi:10.3762/bjnano.2.62

• Angamuthuraj Chithambararaj Arumugam Chandra Bose Nanomaterials Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli – 620 015, India 10.3762/bjnano.2.62 Abstract Hexagonal molybdenum oxide (h-MoO3) was synthesized by a solution based chemical precipitation

• characteristic peaks of molybdenum and oxygen. Thermogravimetric (TG) analysis on metastable MoO3 revealed that the hexagonal phase was stable up to 430 °C and above this temperature complete transformation into a highly stable orthorhombic phase was achieved. The optical band gap energy was estimated from the

• Kubelka–Munk (K–M) function and was found to be 2.99 eV. Finally, the ethanol vapor-sensing behavior was investigated and the sensing response was found to vary linearly as a function of ethanol concentration in the parts per million (ppm) range. Keywords: fiber optic sensor; hexagonal phase; molybdenum

Switching adhesion forces by crossing the metal–insulator transition in Magnéli-type vanadium oxide crystals

• Bert Stegemann,
• Matthias Klemm,
• Siegfried Horn and
• Mathias Woydt

Beilstein J. Nanotechnol. 2011, 2, 59–65, doi:10.3762/bjnano.2.8

• metal–insulator transition (MIT) is the correlation of d band electrons of opposite spins as explained by the Mott–Hubbard model [3]. It was first recognized by Magnèli et al., that oxides of titanium and vanadium as well as those of molybdenum and tungsten form homologous series with planar faults of