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Content archived on 2024-05-29

Preparation and study of cadmium chalcogenites nanowires


Preparation and study of nanowires is one of the most promising domains of the field of nanotechnology. Up to now the reports published in the area described mainly methods of preparation, structural and morphological characterization. For transport charac terization expensive preparation methods for the contacts were required as electron or submicrolithography. The aim of the present project is the preparation and a complete characterization of cadmium chalcogenites nanowires by electrodeposition in ion tra ck templates. The templates will be polymer films (up to several tenths of micrometers thickness) irradiated with swift heavy ions. By controlled etching of the damage trail left by the ions in the materials, pores with the desired shape and dimension can be obtained. The electrochemical replication of the pores will result in arrays of nanowires in the case of multipores membranes or single nanowires in the case of single pore membranes (films which were irradiated with a single ion). The multiwire arrays samples will be used for morphological (electron microscopy), structural (X- ray and electron diffraction) and optical (absorption spectroscopy, luminescence) characterization. The single wire samples will be used for transport characterization - conductiv ity and photoconductivity in a wide range of temperatures, transport in magnetic fields. The results will be a first step in preparation and characterization of nanowire based semiconductor functional devices, the possible field of application being extrem ely wide: light sensors (both photoconductivity and photovoltaic detectors), light emitting devices as LEDs and laser diodes, temperature sensors and so on. The project can be considered as an alternative to the much more expensive methods of preparation, especially for the electric contacting of the nanowires.

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