How can I prepare a flat Carbon nanotube structure like this?

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Ahmad Alrawashdeh

You can generate nanotubes or graphene sheets using either VMD or Nanotube Modeler Softwares.

Viktor Reshetniak

I'd suggest to use the python-ase:

https://wiki.fysik.dtu.dk/ase/index.html

You can find the example of how to build nanotubes here:

https://wiki.fysik.dtu.dk/ase/ase/build/build.html#ase.build.nanotube

Visualization and formatted output are also described in the manual

Shedrack G. Akpe

Viktor Reshetniak Ahmad Alrawashdeh Thank you very much.

Afiq Radzwan

I would suggest you use either VMD or avogadro. Both are open source softwares for building carbon nanotube and graphene.