What are carbon nanotube sensors?

What are carbon nanotube sensors?

Gas sensors based on carbon nanotubes. As a nanotube is a surface structure, its whole weight is concentrated in the surface of its layers. This feature is the origin of the uniquely large unit surface of tubulenes which in turn predetermines their electrochemical and adsorption properties.

What are the three types of carbon nanotubes?

These three types of CNTs are armchair carbon nanotubes, zigzag carbon nanotubes, and chiral carbon nanotubes. The difference in these types of carbon nanotubes are created depending on how the graphite is “rolled up” during its creation process.

What is the function of carbon nanotubes?

Applications of carbon nanotubes and their uses. CNTs are well-suited for virtually any application requiring high strength, durability, electrical conductivity, thermal conductivity and lightweight properties compared to conventional materials. Currently, CNTs are mainly used as additives to synthetics.

Can carbon nanotubes used as biochemical sensors?

In particular, carbon nanotubes (CNTs) can serve as scaffolds for immobilization of biomolecules at their surface, and combine several exceptional physical, chemical, electrical, and optical characteristics properties which make them one of the best suited materials for the transduction of signals associated with the …

How do biochemical sensors work?

Biochemical Sensor Principle An enzyme biosensor uses immobilized biocatalysts such as a single or amultiple enzymes, which recognize, bind, and subsequently transform the target analytes (substrates).

Is CNT a good conductor?

Carbon nanotubes can exhibit remarkable electrical conductivity, while others are semiconductors. They also have exceptional tensile strength and thermal conductivity because of their nanostructure and strength of the bonds between carbon atoms. In addition, they can be chemically modified.

How are nanotubes made?

A sheet of graphene of one atom in thickness is rolled into a tube. This creates a single-walled carbon nanotube. Other than this, layers of these graphene sheets can be rolled in order to create multi-walled carbon nanotubes, which have slightly different properties.

What is the electrical conductivity of CNT?

For example, the electrical conductivity of single-walled CNTs (SWCNT) has been reported to be on the order of 102 to 106 S/cm, multi-walled CNTs (MWCNT) are 103 to 105 S/cm [8] and CNT fibers have conductivities that could vary in orders of magnitude, ranging from 10 to 67,000 S/cm [2].