Poly Nucleotide (GT) Layers with Very High Structural order Are Wrapped on SWCNTs and Cause Separation of Metal/ Semiconductor Nanotubes Based on Electrical Properties and Nanotube Diameter

Note: Many biomolecules have a great ability to differentiate between a certain type of DNA from different nanotubes. The diameter-dependent selective dispersion of SWCNTs is obtained by using chitosan polymer and polyethylene glycol (PEG) oligomeric polymer through twist absorption.

Helical complexation (mononucleotide falvin) on  nanotubes is very interesting. This material can  selectively separate nanotubes (6,8) to the extent of 85% from a sample of nanotubes with wide diameter distribution. DNA has been widely used  to isolate a specific type of nanotubes through non-covalent twisting  . Using  single-stranded DNA, nanotubes can be  dispersed in the solution, and how  the DNA twists selectively depends on the  special sequence of the DNA strand. Poly (GT) layers with  high structural order are wrapped on SWCNTs and  separate metal/semiconductor nanotubes  based on the electrical properties and diameter of the nanotubes  . Then they are performed   on the interaction between DNA and nanotubes  . Separation method DNA  is used to separate and separate nanotubes, during which  nanotubes (5, 6) are enriched  from nanotubes (3, 10)  . The enrichment of metal nanotubes increases as the length of DNA decreases A separation method  for the purification of single nanotubes using  DNA twisting along with  size-  dependent chromatography separates a specific  type  of nanotube from the mixture, and  this work is made more complete by performing  chromatography .  With unique chirality  from a synthetic nanotube mixture,  they are isolated with high purity.  The structural order of the  SWCNT-DNA hybrid has revealed the structure of  SWCNTs  . Theoretical approximations have revealed that  the purine-pyrimidine pattern is recognized as the  It can  create  a hydrogen bond in the direction of forming a two-dimensional sheet  , and it can be selectively  wrapped on nanotubes in the form of a regular three-dimensional tube.

Nanotubes (5,10)  isolated (TTT3)  using DNA with T sequence  have very good efficiency for use  in FET devices. Octadecylamine selectively  interacts with semiconducting SWCNTs, if  the SWCNTs are oxidized. On the contrary, by  using propylamine and isopropylamine in  THF, selective adsorption on metal SWNTs is performed  . This problem causes concentration of the solution of  metal nanotubes. Different colors  of nanotube suspensions are observed, which  indicates the high purity of the specific type of SWCNTs.  Amines can also  be attached to SWCNTs through covalent bonds, but in this case,  there is no selectivity to metal or  semiconductor SWCNTs.

Conclusion:

We conclude that different surfactants have been used to classify  SWCNTs based on chirality  . Selective separation  of SWCNTs is done using SDS solution  with added salt. The connection depending on  diameter and chirality applies to the  general surfactants (sodium diaryl sulfate 10), (sodium  didecylbenzene 11) sulfonate, and (sodium covalent 12)  in aqueous solution.