**2.6 Carbon nanotubes**

Different types of carbon nanotubes (CNTs) have been one of the high potential materials for application in nanotechnology. In this work, the basic features of multiwall carbon nanotubes (MWCNTs) direct production on metal catalyst particles via thermal chemical vapor deposition (T.CVD) with existence of zirconium hydride (ZrH2) and Al nanoparticles were investigated. **Figure 8(a)** and **(b)** illustrate TEM image of MWCNTs that the catalyst nanoparticles are various parts of nanotubes. The average size of the catalyst nanoparticles was about 20 nm. Thus, the considerable effect of ZrH2 particles on the decreasing of the metal particles was clearly specified. Moreover, **Figure 8(c)** and **(d)** indicate the physical properties of MWCNTs such as the well-graphitized walls and open caps of them, respectively [8].

**Figure 7.**

*(a) TEM image of Au/Al2O3 core-shell nanoparticles, (b) corresponding SAED of single nanoparticle core, (c, d) analysis of spot pattern to determined phase and crystal planes [7].*

**15**

**Figure 8.**

**Figure 9.**

**Nanocomposite**

*Transmission Electron Microscopy of Nanomaterials DOI: http://dx.doi.org/10.5772/intechopen.92212*

Compound of carbon nanotubes (CNTs) and metal nanoparticles has displayed considerable features. The major problem in CNTs-reinforced compound has been the regular dispersion of CNTs in nanoparticles. Ball milling technique as an effective method has been progressed for dispersion of the CNTs in micro and nanoparticles. For instance, 20 wt. % MWCNT+Al microparticle was compounded by ball milling method and studied using TEM and EDP technique as well. **Figure 9(a)** and **(b)** demonstrate TEM image and corresponding EDP of MWCNT/Al nanoparticles composite, respectively. Type of phases and crystal planes of MWCNTs and Al

*TEM images of MWCNTs (a), (b) with catalyst nanoparticles, (c) and (d) with physical properties [8].*

The fabrication of bulk Al-BN nanocomposites have strongly been considered due to several advantages such as their light weight, superior mechanical properties

nanoparticles were identified, as shown in **Figure 9(b)** [9].

*(a) TEM image and (b) the SAED pattern of MWCNT/Al composite [9].*

**3. Transmission electron microscopy in the study of Al/BN** 

*Transmission Electron Microscopy of Nanomaterials DOI: http://dx.doi.org/10.5772/intechopen.92212*

#### **Figure 8.**

*Electron Crystallography*

parameter of the shell was obtained.

core-shell nanoparticles was gold [7].

**2.6 Carbon nanotubes**

respectively [8].

By using of the EDP of individual nanoparticle, many of the crystalline structural properties can be measured such as interplanar spacing and the angles of the planes. TEM image of an individual Au/Al2O3 core-shell nanoparticle (**Figure 7(a)**) and the EDP of Au as a shell (**Figure 7(b)**) were demonstrated. In addition, the zone axis and planes of the shell were determined in accordance with standard patterns in **Figure 5(c)** and **(d)**. The spot and ring EDPs of core-shell nanoparticles corroborated of their crystalline specifications. By using of follow equation, lattice

= *h*2 + *k*2 + *l* \_

*a*2

where *a* is lattice parameter, *d* is interplanar spacing, and *hkl* are Miller indices. Lattice parameter of the core was calculated by using of Eq. (1) about a = 4.0502 Å which was near to the gold lattice parameter. Therefore, surely the core of these

Different types of carbon nanotubes (CNTs) have been one of the high potential materials for application in nanotechnology. In this work, the basic features of multiwall carbon nanotubes (MWCNTs) direct production on metal catalyst particles via thermal chemical vapor deposition (T.CVD) with existence of zirconium hydride (ZrH2) and Al nanoparticles were investigated. **Figure 8(a)** and **(b)** illustrate TEM image of MWCNTs that the catalyst nanoparticles are various parts of nanotubes. The average size of the catalyst nanoparticles was about 20 nm. Thus, the considerable effect of ZrH2 particles on the decreasing of the metal particles was clearly specified. Moreover, **Figure 8(c)** and **(d)** indicate the physical properties of MWCNTs such as the well-graphitized walls and open caps of them,

*(a) TEM image of Au/Al2O3 core-shell nanoparticles, (b) corresponding SAED of single nanoparticle core,* 

*(c, d) analysis of spot pattern to determined phase and crystal planes [7].*

2

(1)

\_1 *d*2

**14**

**Figure 7.**

*TEM images of MWCNTs (a), (b) with catalyst nanoparticles, (c) and (d) with physical properties [8].*

**Figure 9.** *(a) TEM image and (b) the SAED pattern of MWCNT/Al composite [9].*

Compound of carbon nanotubes (CNTs) and metal nanoparticles has displayed considerable features. The major problem in CNTs-reinforced compound has been the regular dispersion of CNTs in nanoparticles. Ball milling technique as an effective method has been progressed for dispersion of the CNTs in micro and nanoparticles. For instance, 20 wt. % MWCNT+Al microparticle was compounded by ball milling method and studied using TEM and EDP technique as well. **Figure 9(a)** and **(b)** demonstrate TEM image and corresponding EDP of MWCNT/Al nanoparticles composite, respectively. Type of phases and crystal planes of MWCNTs and Al nanoparticles were identified, as shown in **Figure 9(b)** [9].
