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Nanotechnology
 

Nanostructures Prepared by Controlled Halide Formation and Reduction at Metal Surfaces

Halide layers are photosensitive in most cases, and this fact may be used to create new materials. Although halide reduction is extensively used in the photographic process, to our knowledge it has never been exploited, or even tried, on flat layers of halide prepared by halogen reaction with metal surfaces. On these layers, direct writing of microcircuits could be obtained by electron or photon beams, or by electron injection from an STM tip. The effect of the beam would be to create nanoscopic patches of metal embedded in the insulating halide layer, which can be considered as quantum dots. There is at present a tremendous interest in the possibility of creating controlled arrays of quantum dots. These dots could function as the elements of logic gates, where the dot-dot interaction would be based on electromagnetic coupling, or on electron spin coupling.

Recently we have obtained a promising result in this direction. CuCl continuous film formed at 150 K chlorination process then has been broken during sample keeping at room temperature, forming well-ordered CuCl islands of 35 nm in size on Cu(111) and CuCl islands of 15 nm in size on Cu(100) surfaces.

Metallic nanowires on silicon surface

We are going to use monoatomic hickness masks for metal deposition process under UHV conditions. As a mask we suggest to use a hydrogen or chlorine monolayer formed by adsorption in UHV. A drawing on the mask has to be done by local desorption of adsorbate under STM tip action. Then deposition of the metal (Al, Ag, Cu or other) has to form continuos coverage on the places free of adsorbate. Application of corresponding external electrical potential through the electrodes of micrometer sizes to such a nanowire could form an isolated metallic wire on silicon surface.

STM Lithography

As a result of STM tip action we are able to form quantum dots on silicon surface.

Carbon single wall nanotubes

Fullerene family consisting of C60, C70, polymer chains of fullerenes, single and multiwall nanocapsules and nanotubes, etc. is promising candidate for technological applications. In part, the single wall nanotubes could be used as capillaries for gases or electron emitters in STM. We start the activity in direction of STM study of atomic geometry and electron properties of single wall nanotubes.

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In addition, our gallery was updated with a MM Director presentation, devoted to carbon nanotubes.


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