Synthesis of a composite consisting of carbon nanotubes and graphite shell-encapsulated cobalt nanoparticles using plasma-enhanced chemical vapor deposition

Supported plasma-made 1D heterostructures: perspectives and applications

“…Among the advantages of plasma processes, it has been quoted that they are relatively low cost procedures, environmentally friendly (i.e., solventless method) and scalable at wafer scale for direct deposition onto electronic and photonic devices while providing a precise control over the composition of the deposited materials. Due to these advantages, during the last years plasma technology has being systematically used for the fabrication of 1D nanofibres and other heterostructures [25,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. As already mentioned, most works in this field deal with the fabrication of heterostructures formed by CNTs and carbon nanofibers where the metal particle acts as a catalyst of the growth process.…”

“…As already mentioned, most works in this field deal with the fabrication of heterostructures formed by CNTs and carbon nanofibers where the metal particle acts as a catalyst of the growth process. Just as examples of this type of heterostructures let us mention the case of Co nanoparticles encapsulated in CNTs that were synthesised by a one-step PECVD method at high pressures and substrate temperatures [32], that of Ti-coated CNTs fabricated by inductively-coupled plasma enhanced chemical vapour deposition (ICP-CVD) and Ti sputtering for field emission applications [33][34][35] or Cu-C hybrid nanosystems produced by means of plasma deposition of carbon on copper metal seeds [28]. The results of Penza et al about the decoration of CNTs with metal (Ag, Au, Pt and Ru) nanoparticles are also very promising in the field of nanosensor applications [36].…”

Effect of catalyst film thickness on the structures of vertically-oriented few-layer graphene grown by PECVD

“…9. In our previous study, 44 we found that Co catalyst particles with small sizes have catalytic effect for promoting CNTs' growth, whereas the large Co catalyst particles are not suitable for growth of CNTs, and the graphite layer will cover the large Co particle surface to form graphite shell-encapsulated Co particles. However, in this case, the small Co catalyst particles do not catalyze the growth of CNTs, as shown in Fig.…”

“…[40][41][42] Subsequently, the Co catalyst nanoparticles were formed, uniformly distributed on Si substrate, and the size distribution of Co catalyst nanoparticles will increase with an increase of the thickness of Co catalyst lm. According to the previous reports, 43,44 the size of catalyst particles plays a very important role in the carbon nanomaterials growth process. In this work, it is obvious that the Co particles with different sizes show different catalyst activities, which signicantly inuence the morphology and structures of obtained FLG.…”

“…4. According to previous investigations on the FLG-CNT hybrids, 5,44,46 the FLG were grown in situ on the induced defects of CNT by high energy ion bombardment of plasma. Results demonstrate that the FLG were directly grown on graphite layer with intrinsic defects, and that the graphite layer rapidly formed by Co catalysis can redound to FLG nucleation.…”