microscope Articles
-
Very low energy scanning electron microscopy in nanotechnology
The group of low energy electron microscopy at ISI AS CR in Brno has developed a methodology for very low energy scanning electron microscopy at high image resolution by means of an immersion electrostatic lens (the cathode lens) inserted between the illumination column of a conventional scanning electron microscope and the sample. In this way the microscope resolution can be preserved down to a ...
-
Atomic force microscope-based nanomanipulation with drift compensation
Automating the task of nanomanipulation is extremely important since it is tedious for humans. This paper proposes an atomic force microscope (AFM) based force controller to push nano particles on the substrates. A block phase correlation-based algorithm is embedded into the controller for the compensation of the thermal drift which is considered as the main external uncertainty during ...
-
Field emission measurement techniques for the optimisation of carbon nanotube cathodes
We have developed advanced measurement techniques for the investigation of the field emission (FE) properties of high-technology materials. Flat samples up to 30 mm in diameter can be optimised either for strong or weak electron emission, i.e., cold FE cathodes operating at field levels below 10 V/μm or high-voltage vacuum devices preventing FE up to 200 V/μm. The integral measurement system with ...
-
The Canadian Centre for Electron Microscopy: a national facility for ultrahigh resolution electron microscopy
The Canadian Centre for Electron Microscopy is described and the facilities available to Canadian researchers and international collaborators are presented. The facility offers aberration-corrected transmission electron microscopy instrumentation, conventional transmission electron microscopes, scanning electron microscopes and a suite of sample preparation facilities. The advantages and benefits ...
-
Temperature dependent exciton radiative lifetime in ZnO nanorods
In this paper, we report the fabrication of ZnO nanorods using vapour phase transportation. The morphology of ZnO nanorods is characterised using scanning electron microscope. The optical properties of the nanorods are studied using time-integrated photoluminescence and time-resolved photoluminescence. It is found that the exciton radiative lifetime increases with temperature. The mechanism for ...
-
Ultrafine Particles Come Under the Microscope
NANOTECHNOLOGY IS AN UMBRELLA TERM FOR the science and technology of controlling the structure and properties of materials and systems at the scale of 10-9 meters — 1/100,000 the width of a human hair, or less than 0.1 . Growth projections for nanotechnology applications are 33% a year, according to the National Science Foundation, which has estimated that by 2015 such applications may total $1 ...
-
Synthesis of vanadium oxide/titanium dioxide nanocomposites via sonochemical and hydrothermal process and their utilisation for energy storage application
This work focuses on the synthesis of V2O5/TiO2nanocomposites by sonochemical and hydrothermal process. First, titanium dioxide (TiO2) nanopowders were synthesised by sonochemical process using titanium isopropoxide as a titanium source. Meanwhile, hydrothermal process was employed to modify the structure of commercial V2O5 powder to be nanorod–like structure V2O5 to increase its specific surface ...
-
Adsorption characteristics of Cu2+ on NiFe2O4 magnetic nanoparticles
Magnetic NiFe2O4 nanoparticles have been synthesized and used as adsorbents for copper removal from aqueous solution. The NiFe2O4 nanoparticles were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, and Fourier transform infrared spectroscopy. The batch removal of Cu2+ ions from aqueous solutions using NiFe2O4 magnetic nanoparticles under ...
-
Diversity of entrepreneurs and diversity of clusters in nanotechnologies
The objective of the present contribution is to characterise the nature and role of entrepreneurs in nanotechnologies. The analysis is conducted with regards to specific contexts of emergence of nanotechnologies that we characterise by a two-stage process of development. We show that the risk-taking entrepreneur who transforms externalities into new activities by combining existing resources is ...
-
E–beam lithography processing of Au–nanowire contacts for development of gas sensors based on tungsten–oxide nanorods self–assembled on mica
This work describes the processing of Au nanowire arrays on insulating substrate developed to contact tungsten–oxide nanorods self–organised on the mica surface. The combination of electron beam lithography in scanning electron microscope and lift–off process is shown to be effective in fabricating nanocontact finger patterns with a line width of about 270 nm and 400 nm on bare and WO3 nanorod ...
-
Nanoparticle formation in the synthesis of nanostructured fibres and powders of refractory oxides
Processes for fabricating of nanostructured fibrous materials from alumina and zirconia are studied with the aim to develop a production technology of high-dispersed reactive materials, from which ceramics can be produced and which can be used as composite fillers. The investigations of these processes have enabled one to establish a mechanism for the formation of the structure of fibrous oxides ...
-
Nano-fractals from inorganic salts induced by fullerene polymer systems
This study investigates the formation of nano-fractals of inorganic salts induced by polymethacrylic acid-b-C60 (PMAA-b-C60) and polyacrylic acid-b-C60 (PAA-b-C60) under various physical conditions. The polymers were synthesised by atom transfer radical polymerisation (ATRP) and fractals were produced when the solutions with inorganic salts were dried under isothermal conditions. Fractals formed ...
-
Self-assembled Bi nanolines on the InAs(100) surface: a theoretical study
The authors have performed an ab initio theoretical investigation of the stability, atomic geometry and electronic properties of the self-assembled Bi nanolines on the Bi-stabilised InAs(100) surface. The calculations were performed within the local density approximation of the density functional theory, using pseudopotentials to describe the electron-ion interactions. The authors have examined ...
-
Brownian motion of magnetic nanoparticles as a source of energy?
Brownian motion of magnetic nanoparticles in a low–density gas can induce random voltage pulses in a microscopic electric circuit containing a high–number–of–turns coil and a classical diode rectifier. The amplitude of the voltage pulses is estimated and the rectification condition examined. We have shown that in our toy–model nanogenerator where the motion of the magnetic nanoparticle is ...
-
Nanofluidics and the Navier boundary condition
Nanofluidics is the study of fluid flow in or around nano scale systems. At this scale, conventional ideas of fluid mechanics do not apply, and the long-standing traditional approaches to fluid mechanics problems need to be adjusted to correctly reflect the importance of the interaction between a fluid and a solid boundary. This is because as devices are miniaturised, the surface-to-volume ratio ...
-
Preparation and characterization of iron oxide nanoparticles coated with chitosan for removal of Cd(II) and Cr(VI) from aqueous solution
This study investigated the applicability of magnetite Fe3O4 nanoparticles coated with chitosan (CMNs) for the removal of some toxic heavy metals from simulated wastewater. Magnetic nanomaterials were synthesized using the co-precipitation method and characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, and Fourier transformer infrared spectroscopy. ...
-
Nanoscopic surface architecture based on molecular self-assembly and scanning probe lithography
Scanning probe lithography and molecular self-assembly have been integrated for constructing surface nanostructures. In the first part of this paper, organosilane monolayers grown through molecular self-assembly, i.e., self-assembled monolayers (SAMs) are applied as patterning media in scanning probe lithography based on scanning tunnelling microscopy (STM) and atomic force microscopy (AFM) with ...
-
Feasibility of simultaneous surface topography and XRF mapping using Shear Force Microscopy
Marketed sources equipped with polycapillary optics allow now laboratory X–Ray Fluorescence (XRF) analysis with 5–10 µm lateral resolution. To improve it, we had the idea to use a thin cylindrical X–ray capillary fitted to the XRF detector. The combination with near–field microscopy would then lead to a simultaneous record of both topography and XRF from a sample at µm lateral resolution. For ...
-
Novel silver nanoparticles: synthesis, properties and applications
In this paper, we present versatile and effective techniques to synthesise silver nanoparticles (Ag-NPs)-based compounds such as colloidal silver nanoparticles (CSNPs) and silver nanoparticles powders (SNPPs). The CSNPs stabilised by a surfactant oleic acid were produced for the first time through the reduction of [Ag(NH3)2]+(aq) complex by glucose with UV irradiation treatment, while the SNPPs ...
-
Nanomanipulation and characterisation of individual nano-objects inside a SEM
This paper describes the use of nanomanipulation for deforming, picking up and positioning nano-objects in situ in a field emission scanning electron microscope using an in-house built manipulator. Our experiments demonstrate that physical manipulation can be used in a wide range of different experiments and systems. The scope of possibilities is quite large, from mounting nanodevices to ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you