book of abstracts - IM2NP

A B S T R A C T S FRIDAY, JULY 2 N A N O S E A 2 0 1 0
CNTs have been synthesised at 750 °C by thermal chemical vapour deposition (CVD) of acetylene (C2H2)
gas, in ammonia (NH3) atmosphere, onto SiO2/Si(100) substrates with nickel (Ni) catalyst nanoparticles. A
Ni thin film (3 nm) has been deposited by thermal evaporation onto a masked substrates (100 nm of SiO2
grown onto a silicon (100) wafer) in order to obtain four single rectangular Ni strips of different length.
CNTs are grown only onto the Ni strips. Gold rectangular electrodes have been evaporated on the ends of
each strip overlapping the nanotubes for about 1 mm.
This device has been used in order to investigate the photoconductivity properties of MWCNTs under white
light and different radiation in the visible region. It has been observed that the dark current versus bias
voltage characteristics of each strip have an Ohmic behaviour, and the presence of continuous white light
illumination, as well as monochromatic radiation, induces a photocurrent in each strip. The photocurrent has
been generated by illuminating either the whole device surface with white light or a small part of the CNT
strips with a laser spot. We have obtained a current of few mA in a narrow range of bias voltages -1