Single-Walled Carbon Nanotubes (SWNT)

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SWNT. Semi-contact mode. Topography.

SWNT. Semi-contact mode. Phase image.

Single-walled nanotube deposited on mica. Image size 2.2x2 μm. 200x200 points. Semi-contact mode.

Upper left image - topography. Upper right image - phase.

Upper profile image - profile in section along axis. Lower profile - profile in section across axis

Image was obtained with scanning probe microscope Certus Light.




SWNT. Semi-contact mode. Profile in section along axis.

SWNT. Semi-contact mode. Profile in section across axis.

Carbon nanotube (CNTs. See more Carbon nanotube) is one allotropes carbon. CNTs have a long cylindrical structure with the diameter is on the order of a few nanometers, when length a few centimeters. Length-to-diameter ratio of approximately 1х108:1. They consist of one or more rolled-up hexagonal graphite planes. Vertex of CNTs can have hemispherical head, like half a fullerene molecule, or to have an open ending.

Angle of orientation of the graphite plane relative to the axis of the nanotube (chirality) can changed the physical properties of such a structure. For example, electrical. Nanotube can be semiconducting or conducting.

Known single-walled (SWNT) and multi-walled nanotubes. The latter can form a huge number of shapes and configurations. For example, coaxially nested cylinders and prisms, scrolls. The distance between the layers of MWNTs is about 0.34 nm, as well as in graphite.

CNTs show different properties depending on the chirality, bends, structure defects. Theoretically have very high strength.

Currently, study of characteristics of carbon nanotubes is an active area of research, because their physical properties suggest the possibility of application in many areas.

Potential applications of carbon nanotubes:

  • Create super-strong materials. Fibers, textiles, composites, etc.
  • The integration of electronic elements with biological objects.
  • Materials for storage and delivery of biologically active substances and other organic compounds, gases, metals, etc.
  • Creation of microelectronic devices: transistors, conductors, optoelectronic components (transparent displays, light emitting diodes), etc.
  • Device for transporting liquids in micro-and nanoscale.
  • Sensors (adsorption of substances on the surface of nanotubes changes their resistance).
  • SPM tips.

 

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Tip Enchanced Raman Scattering (TERS)

Одностеночная углеродная     нанотрубка. ГКР (TERS).

 

Device for transporting liquids in micro-and nanoscale.