Nanometer size?

Question

There is a carbon tube that is as small as nanometer-sized. I want to say this one in a noun phrase.

1 A nanometer-size carbon tube.
2 A nanometer-scale carbon tube.
3 A nanoscale carbon tube.

Or are they too casual? If so:
4 A carbon tube of nanometer-size
5 A carbon tube of nanometer-scale
What would you say? Is 3 the best?

Teechr · Accepted Answer

#3 is fine, but the others are not!

Can you provide full sentences?

Supercat · Answer

I'm sorry that my question in #1 is different to what I wanted to do first. I try once again.
There's a technique to enclose an organic molecule in a carbon tube as small as nanoscale. Especially, its inner space is nanoscale in size (This is what I've forgotten in #1).

And my try is:
The behaviour of molecules can be observed thanks to the technique to enclose a small organic molecules into a carbon tube that has the nanoscale inner space.

I suspect the noun phrase 'a carbon tube that has a nanoscale inner space'. Moreover, I wonder there's a better alternative

Mister Micawber · Answer

The behaviour of molecules can be observed thanks to a technique to enclose small organic molecules in a carbon tube with a nanoscale interior.

Supercat · Answer

I've found my careless mistake: a small organic molecules ? small organic molecules

I wasn't sure which I should have used a or the for nanoscale interior (inner space) ><

Nanometer size?

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