Multi-wall carbon nanotube functionalized with CdS nanoparticle by plasmadeposition method

The CdS/CNT composite is of particular interest in many application fields, since it was shown that it is capable of generating photocurrent from visible light with unusually high efficiency and for microwave reduction properties. But there is a little information about the electronic properties. In this paper we focus on improving electrical properties by deposition CdS nanoparticles on CNTs. The Co thin film which used as catalyst for growth of CNTs was deposited on Si substrate by plasma enhanced CVD. Carbon nanotube growth was carried out on Co/Si substrates using an ethanol source in CVD without any carbon decomposition process. In next step CdS nanoparticles were grown on multi wall nanotubes (MWNTs) by RF magnetron sputtering plasma assisted deposition system. Scanning electron microscopy study revealed a direct contact between CdS nanoparticles and CNT surface. X-ray diffraction and Raman studies of CdS/CNT show that the surface of CNTs are coated with zinc blende structure of CdS nanoparticles and composite is able to emit in the visible region of the spectra. The electrical resistance analyzed by Four point probe system shows by depositing CdS on CNTs the resistivity of prepared composite reduced. Details of results will be discussed in full paper.