1,721,213 research outputs found
Controllable fabrication of aligned carbon nanotubes by pulsed plasma: selective positioning and electrical transport phenomena
No full textSelective growth of aligned carbon nanotubes (CNTs) at low temperature by pulsed plasma on Si3N4/Si substrates patterned by metallic platinum has been demonstrated. Field emission and atomic force microscopy (AFM) have shown that platinum does not support CNT growth, so that nanotubes can selectively grow on substrates patterned by platinum. This feasible fabrication method has been used to measure the electrical resistivity of as-aligned CNT film perpendicular to the-tube axis without a complex postsynthesis manipulation. The prepared samples show a monotonic decrease in the resistivity with increasing temperature. We propose that the transport is governed by the formation of crossed junctions of nanotubes in the mat. (C) 2003 Elsevier B.V. All rights reserved. RI Valentini, Luca/D-5238-2011; Kenny, Jose/F-9372-201
Polymer nanocomposites, from fundamentals to applications
No full textFor many applications the understanding of the structure-properties relationship of hybrid systems composed by polymers, carbon nanomaterials and surfactants is of outstanding importance. Besides the use as mechanical reinforcements, carbon nanomaterials can offer opportunities in creating fully new properties due to their intrinsic characteristics, which are not only related to mechanical properties. For this reason such nanocomposites are recognized as multifunctionals. The formation of such supramolecular complexes lead toward the processing of innovative composites
Incorporation of reduced graphene oxide sheets into organicmedia for the realization of conducting and photoresponsive nanocomposites.
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Formation of unzipped carbon nanotubes by CF4 plasma treatment
No full textIn this paper we report the evidence of formation of short and unzipped single-walled carbon nanoube (SWCNTs) through a facile and scalable plasma method. The approach consists of a CF4 RF plasma treatment of SWCNTs; transmission electron microscopy as well as atomic force microscopy showed the evidence of the attainment of unzipped SWCNTs by this method. X-ray photoelectron spectroscopy have been used to demonstrate the fluorination of such nanostructures. The production of such nanostructured architectures may allow for their large scale integration into polymer based nanocomposites
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