Molybdenum disulphide, a diamagnetic layered dichalcogenide solid, is found to show magnetic ordering at room temperature when exposed 2 MeV proton beam. The dependence of magnetization displays ferrimagnetic behavior with Curie 895 K. A disorder mode corresponding zone-edge phonon and Mo valence higher than +4, have been detected in the irradiated samples using Raman X-ray photoelectron spectroscopy, respectively. possible origins long-range MoS2 are discussed.

We demonstrate the growth of high quality single phase films VO2(A, B, and M) on SrTiO3 substrate by controlling vanadium arrival rate (laser frequency) oxidation V atoms. A diagram has been developed (oxygen pressure versus laser for various phases VO2 their electronic properties are investigated. VO2(A) is insulating VO2(B) semi-metallic, VO2(M) exhibits a metal-insulator transition, corroborated photo-electron spectroscopic studies. The ability to control polymorphs opens up possibility...

Graphene samples with 1, 2, and 4 layers 1 + folded bi-layers graphite have been irradiated 2 MeV protons at fluences ranging from × 1015 to 6 1018 ions/cm2. The were characterized using visible UV Raman spectroscopy microscopy. ion-induced defects found decrease increasing number of layers. suspended over etched holes in SiO2 fabricated used investigate the influence substrate for defect creation graphene. While vibrational modes 1460 cm−1 1555 observed spectra substantially damaged...

Iron pyrite has received significant attention due to its high optical absorption. However, the loss of open circuit voltage (Voc) prevents further application in photovoltaics. Herein, we have studied photophysics by ultrafast laser spectroscopy understand fundamental limitation low Voc quantifying photocarrier losses quality, stoichiometric, and phase pure {100} faceted nanocubes. We found that fast carrier localization photoexcited carriers indirect band edge shallow trap states is...

In this paper, a simple and effective experimental approach has been used to extract the mechanical properties of suspended nanomechanical graphene devices using atomic force microscopy (AFM). The main objective work is study deflection behaviour as function layer number (1–5 layers) anchor geometry which not widely investigated so far. Elastic nonlinear responses were obtained AFM nanoindentation. estimated linear (2.5 N m−1 7.3 m−1), spring constants (1 × 1014 m−3 15 m−3) pretension (0.79...

Abstract Black phosphorus (BP) is a new class of 2D material which holds promise for next generation transistor applications owing to its intrinsically superior carrier mobility properties. Among other issues, achieving good ohmic contacts with low source-drain parasitic resistance in BP field-effect transistors (FET) remains challenge. For the first time, we report contact technology that employs use high work function nickel (Ni) and thermal anneal produce metal alloy effectively reduces...

Abstract The reduced electrical screening in 2D materials provides an ideal platform for realization of exotic quasiparticles, that are robust and whose functionalities can be exploited future electronic, optoelectronic, valleytronic applications. Recent examples include interlayer exciton, where electron from one layer binds with a hole another, Holstein polaron, formed by dressed sea phonons. Here, new quasiparticle is reported, “polaronic trion” heterostructure MoS 2 /SrTiO 3 (STO). This...

A thorough investigation of the structural parameters micromechanically exfoliated multilayer WSe2 flakes was undertaken between 400 K to 110 K. Crystal structure remains in trigonal prismatic this temperature range, however, with a clear difference dependence in-plane a, and out-of-plane c, lattice parameters. The linear coefficients thermal expansion c are 5.132 × 10−6/K 8.105 10−6/K, respectively. unit-cell volume is analyzed using zero-pressure equation-of-state which yielded Debye be...

The defect emission from h-BN at 1.55 eV is interesting as it enables optical readout of spins. It necessary to identify the nature relevant point defects for its controlled introduction. However, challenging engineer in without changing local atomic structure. Here, we controllably introduce boron vacancies using an ultrahigh spatial resolution and low-energy He+ ion beam. By optimizing irradiation conditions, control quantity location spatially along depth achieve a robust...

We demonstrate that a high quality metal organic chemical vapor deposition (MOCVD) HfAl/sub x/O/sub y/ (hereafter HfAlO) dielectric film can successfully be deposited with wide range of composition controllability between HfO/sub 2/ and Al/sub 2/O/sub 3/ in HfAlO using single cocktail liquid source HfAl(MMP)/sub 2/(OiPr)/sub 5/. A ratio 45 to 90% is achieved by controlling process parameters. The effect the on electrical properties also investigated. (10% 3/), which has minimum sacrifice K...

Patterning of the two-dimensional electron gas formed at interface two band insulators such as LaAlO3/SrTiO3 is one key challenges in oxide electronics. The use energetic ion beam exposure for engineering conductivity has been investigated. We found that this method can be utilized to manipulate by carrier localization, arising from defects created exposure, eventually producing an insulating ground state. This process ion-beam-induced defect creation results structural changes SrTiO3...

Large area low-cost patterning is a challenging problem in graphene research. A resist-free, single-step, large and cost effective soft lithographic strategy presented for graphene. The technique applicable on any arbitrary substrate that needs to be covered with film provides viable route large-area of device applications.

While direct bandgap monolayer 2D transition metal dichalcogenides (TMDs) have emerged as an important optoelectronic material due to strong light-matter interactions, their multilayer counterparts exhibit indirect resulting in poor photon emission quantum yield. We report bandgap-like photoluminescence at ∼1.9 eV from MoS2 grown on SrTiO3, whose intensity is significantly higher than that observed MoS2/SiO2. Using high-resolution electron microscopy we observe interlayer twist and >8%...

It is shown that polycrystalline fullerene thin films on hydrogen-passivated Si(111) substrates irradiated by $2\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ protons display ferromagneticlike behavior at $5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. At $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, both the pristine and film show diamagnetic behavior. Magnetization data in temperature range of $2--300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ $1\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ applied field, for much...

This letter presents a novel technique for tuning the work function of metal gate electrode. Laminated electrodes consisting three ultrathin (/spl sim/1-nm) layers, with nitrides (HfN, TiN, or TaN) as bottom and top layers element metals (Hf, Ti, Ta) middle layer, were sequentially deposited on SiO/sub 2/, followed by rapid thermal annealing annealing. Annealing laminated stacks at high temperatures (800/spl deg/C-1000/spl deg/C) drastically increased their functions (as much 1 eV HfN-Ti-TaN...

Dentinogenesis imperfecta is an autosomal dominant disorder of tooth development characterized by the presence opalescent dentin, resulting in a dusky blue to brownish discoloration teeth. This condition genetically and clinically heterogeneous; it may affect only teeth or be associated with osteogenesis imperfecta. has been subdivided into three types: type I imperfecta; II there no when Brandywine triracial isolate large pulp chambers classified as III.<br>This report describes 16-year-old...

Electrons commonly couple through Fr\"ohlich interactions with longitudinal optical phonons to form polarons. However, trions possess a finite angular momentum and should therefore instead rotational phonons. This creates polaronic trion whose binding energy is determined by the crystallographic orientation of lattice. Here, we demonstrate theoretically within approach experimentally photoluminescence emission that bare (20 meV) significantly enhanced at interface between two-dimensional...

A simple procedure to synthesize 3D microarchitectures of γ-MnS films at low temperature is described in the present work.

Summary Carbon nanotubes (CNTs) have become an important nano entity for biomedical applications. Conventional methods of their imaging, often cannot be applied in biological samples due to inadequate spatial resolution or poor contrast between the CNTs and sample. Here we report a unique effective detection method, which uses differences conductivities carbon HeLa cells. The technique involves use helium ion microscope image sample with surface charging artefacts created by He + neutralised...

Periodic ripples of amplitude ∼15 nm were formed in suspended bilayer graphene after nanoindentation with incremental forces up to 600 nN. The structure was annealed at ∼620 K high vacuum and the corresponding modifications mechanical properties surface morphology investigated. pre-tension pristine sample found be 1.46 N m−1 annealing it reduced 0.72 m−1. nanometre-sized induced by excitation flattened annealing. Tailoring corrugations through thermal engineering these thus provides an...

Using the carrier separation measurement technique, we are able to distinguish two different breakdown mechanisms: a high-k bulk initiated, and an interfacial layer initiated. The results correlate with statistical Weibull distribution showing polarity dependent in stacks. A model of charge trapping at spatial locations HfAlO/sub x/ TaN gate structure is proposed explain dependence characteristics mechanisms.

This paper investigates the potential uses of graphene nanomechanical devices for NEMS applications fabricated using Helium Ion Microscope (HIM). Suspended drum structures diameter (~2 - 3 μm) and thickness ranging from few atomic layers (~10 Å) to about 11 nm have been characterized Atomic Force Microscopy (AFM). The initial suspension profile obtained AFM. FEM results suggest that these can vibrate in range several MHz. Their small size higher operating frequencies make them well suitable...