Síntese e caracterização de nanotubos de carbono via método CVD

Abstract

The high electrical and thermal conductivity and mechanical resistance make carbon nanotubes an attractive basis for the development of nanotechnology. Thus, this work aims to synthesize and characterize carbon nanotubes via CVD using methane gas as a precursor. The catalyst is composed of nickel supported on natural zeolite (clinoptilolite). The chemical deposition via the vapour phase was carried out by reaction at a programmed temperature, using the range of 500 ºC to 650 ºC. Different techniques were used to characterize the catalyst and/or the deposited carbon: X-Ray Diffraction, Raman Spectroscopy, Thermogravimetric Analysis and Temperature Programmed Desorption of pyridine. The material produced via CVD was submitted to purification and functionalization in an acid medium for later use in the preparation of a sensor device and applied to detect methanol in a gaseous mixture. The data show that the functionalization of carbon nanotubes is a decisive step in obtaining a device with superior sensitivity.