نتایج جستجو برای: nanotip fabrication

تعداد نتایج: 54479  

Journal: :ACS nano 2016
J G Vilhena Carlos Pimentel Patricia Pedraz Feng Luo Pedro A Serena Carlos M Pina Enrico Gnecco Rubén Pérez

The sliding of a sharp nanotip on graphene completely immersed in water is investigated by molecular dynamics (MD) and atomic force microscopy. MD simulations predict that the atomic-scale stick-slip is almost identical to that found in ultrahigh vacuum. Furthermore, they show that water plays a purely stochastic role in sliding (solid-to-solid) friction. These observations are substantiated by...

2015
C. Spiel D. Vogel R. Schlögl G. Rupprechter Y. Suchorski

Spatial coupling during catalytic ignition of CO oxidation on μm-sized Pt(hkl) domains of a polycrystalline Pt foil has been studied in situ by PEEM (photoemission electron microscopy) in the 10(-5) mbar pressure range. The same reaction has been examined under similar conditions by FIM (field ion microscopy) on nm-sized Pt(hkl) facets of a Pt nanotip. Proper orthogonal decomposition (POD) of t...

2012
Tsung-Chieh Cheng Pai-Yen Chen Shen-Yao Wu

We put forward the quantum screening effect in field emission [FE] nanodiodes, explaining relatively low field enhancement factors due to the increased potential barrier that impedes the electron Fowler-Nordheim tunneling, which is usually observed in nanoscale FE experiments. We illustratively show this effect from the energy band diagram and experimentally verify it by performing the nanomani...

2007
Aijun Yin Jin Ho Kim Jimmy Xu

We demonstrate a method for fabricating a variety of nanostructured metallic thin films by using one simple approach based on the use of anodic aluminum oxide (AAO) membrane as masking template. Highly-ordered large-area metallic nanoporeor nanotip-arrays (e.g., Ni, Ag, Au), with various sizes and shapes, were deposited onto AAO membranes through e-beam evaporation. Free standing nano-patterned...

Journal: :New Journal of Physics 2021

We investigate strong field ionization of an atomic gas in a plasmonically enhanced resulting from the illumination nanometer-sized structure with ultrafast laser pulse. use perturbation theory to derive approximate solution for electron's motion following ionization. These analytical estimates are corroborated by time-dependent Schrödinger equation and classical trajectory Monte Carlo simulati...

Journal: :journal of medical signals and sensors 0
mohammad-taghi bahreyni-toosi shahrokh nasseri mahdi momennezhad fatemeh hasanabadi hamid gholamhosseinian

the aim of this study is to provide a control software system, based on monte carlo simulation, and calculations of dosimetric parameters of standard and wedge radiation fi elds, using a monte carlo method. gate version 6.1 (opengate collaboration), was used to simulate a compact 6 mv linear accelerator system. in order to accelerate the calculations, the phase-space technique and cluster compu...

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