Investigation on Nanodiamond and Carbon Nanotube‐Diamond Nanocomposite Synthesized using RF‐PECVD

Abstract

Nanodiamond (ND) and carbon nanotube-diamond (CNTD) nanocomposite films are synthesized on silicon(100) substrates, discharging hydrogen-based gas mixture (methane and hydrogen), using radio frequency plasma-enhanced (RF-PE)CVD. Substrate pretreatment conditions are examined for enhancing microdiamond (MD), ND, CNTD nanocomposite, or carbon nanotube (CNT) nucleation. Well-faceted MD with a low nucleation density, on a silicon substrate, is achieved using a solution of NaOH in water to roughen the silicon substrate, while ND, CNTD nanocomposite, and CNTs are acquired using Co(NO 3 ) 2 /Mg(NO 3 ) 2 .6H 2 O or Fe(NO 3 ) 3 .9H 2 O/Mg(NO 3 ) 2 .6H 2 O or Ni(NO 3 ) 2 .6H 2 O/Mg(NO 3 ) 2 .6H 2 O solution in alcohol dripped onto the silicon substrate, which means that pretreatments have a significant influence on grain size, nucleation density, and microstructure of the obtained films. The growth mechanisms for ND and CNTD nanocomposite are discussed.

Enhanced Field Electron Emission Properties of Hybrid Carbon Nanotubes Synthesized by RF‐PECVD

“…This suggests that this growing pattern is attributed to the carbon radical concentration in the plasma and the appropriate nucleation sites such as the CNT tips or the surface defects. [23] In general, a hydrogen-rich gas mixture (H 2 /CH 4 ) can be used to grow micro-and nanodiamond films, [24] where atomic hydrogen is needed to selectively etch the graphitic bonding during the growth. The formation of carbon nanocones is also correlated to this etching effect during the deposition.…”

Application of Nano-Crystalline Diamond in Tribology

“…Table 2 summarizes the tribological performance for NCD lubricating films. At present, there are three kinds of CVD equipment for preparing NCD films, namely hot filament CVD (HFCVD) [ 84 , 85 , 86 , 87 , 88 , 89 , 90 ], microwave plasma CVD (MPCVD) [ 91 , 92 , 93 , 94 , 95 , 96 ] and plasma enhanced CVD (PECVD) [ 97 , 98 , 99 , 100 , 101 ]. The schematic diagram of diamond film preparation is shown in Figure 4 .…”

Carbon nanotubes overgrown and ingrown with nanocrystalline diamond deposited by different CVD plasma systems

“…forming composites . Several reports deal with a preparation of pure carbon‐carbon composites, especially CNTs and nanodiamond powders (ND) and in rare cases CNTs and nanocrystalline diamond (NCD) . In some cases a transformation of multi‐wall carbon nanotubes (MWNTs) to diamond/amorphous carbon was observed.…”