How do carbon nanotubes become room temperature?

How do carbon nanotubes become room temperature?

We develop a new chemical route to prepare carbon nanotubes at room temperature. Graphite powder is immersed in a mixed solution of nitric and sulfuric acid with potassium chlorate. After heating the solution up to 70°C and leaving them in the air for 3 days, we obtained carbon nanotube bundles.

How are carbon nanotubes mass produced?

Three main CNT synthesis methods have been developed: arc discharge, laser ablation, and chemical vapor deposition (CVD). A common feature of the arc discharge and laser ablation methods is high energy input by physical means, such as an arc discharge or a laser beam, to induce the assembly of carbon atoms into CNTs.

Which of the following sources can be used to produce carbon nanotubes by chemical Vapour deposition?

Since that, ethanol has become a commonly used carbon source for CVD synthesis of CNTs. The low price of ethanol can greatly reduce the cost, making the production of carbon nanotubes almost free.

What is the best method for preparing carbon nanotubes for industrial applications?

The production of carbon nanotubes can be done by plasma based synthesis method or arc discharge evaporation method, laser ablation method, thermal synthesis process, chemical vapor deposition and by plasma-enhanced chemical vapor deposition.

How do you obtain carbon nanotubes from graphite?

Graphite powder is immersed in a mixed solution of nitric and sulfuric acid with potassium chlorate. After heating the solution up to 70°C and leaving them in the air for 3 days, we obtained carbon nanotube bundles. This process could provide an easy and inexpensive method for the preparation of carbon nanotubes.

Where does the carbon for nanotubes come from?

The fullerenes and CNTs are formed by plasma arcing of carbonaceous materials, particularly graphite. The fullerenes or carbon nanotubes appear in the soot that is formed, while the CNTs are deposited on the opposing electrode.

What are the two ways of preparation of carbon nanotubes?

Commonly, three procedures are being used for producing CNTs: (1) the chemical vapor deposition (CVD) technique [12,13], (2) the laser-ablation technique [3,9], and (3) the carbon arc-discharge technique [14-16] (Table 3).

What is the role of catalyst in chemical vapor deposition technique for the synthesis of CNT?

Catalytic chemical vapor deposition (CCVD) is another efficient and low-cost method for the mass production of highly pure carbon nanotubes (CNTs). In this process, CNTs are produced by the catalytic de- composition of hydrocarbon vapors.

Which method of preparation of CNT required less temperature?

Chemical vapor deposition (CVD) has been widely used for large-scale synthesis of high quality CNTs due to its controllability and low process temperature [13,14].

What are the two types of carbon nanotubes?

In addition to the two different basic structures, there are three different possible types of carbon nanotubes. These three types of CNTs are armchair carbon nanotubes, zigzag carbon nanotubes, and chiral carbon nanotubes.