Re: How do nanotubes behave as conductor in transmission-lines (coplanar waveguide, microstriplines...)?



<John.S.Novak@xxxxxxxxx>; "III" <jsn@xxxxxxxxx> wrote in message
news:11if9qq3vfvgn70@xxxxxxxxxxxxxxxxxxxxx
>
> In article <11ie22pfm14ngc3@xxxxxxxxxxxxxxxxxx>, gfoersler@xxxxxx
> says...
>
> > does anyone have a link to a site where I can read something about the
> > behaviour of nanotubes as a conductor in transmission-lines (coplanar
> > waveguide, microstriplines...)?
>
> For those not versed in the arts, what Greg is referring to are various
> types of structures used to carry signals in the RF, microwave, and
> millimeter wave frequency regimes. One of the hallmarks of those
> frequency regimes is that the circuit elements are now only slightly
> larger than, roughly the same size as, or slightly smaller than, the
> wavelengths of the signals they are carrying.
>
> Special techniques are required to design and analyze circuitry
> operating at those frequencies. Microwave design is something of a
> superset of alternating current designs, in the same fashion as
> alternating current is a superset of direct current design.
>
> A very reasonable and important question is, where do nanotubes and
> similar structures fit in this regime?
>
> > It would be interesting to know if coplanar waveguides or microstrip
> > lines made of nanotubes could be used to connect amplifiers and mixers
> > and so on on a GaAs chip and maybe also be used as microstripline
> > filters on chip between the various circuit blocks.
> > Also interesting would be a link where to read about if there is a skin
> > effect in a conductor made of nanotubes.
>
> This is an active research topic, right now, so the answers are not
> formalized in the same way that microwave techniques are. In some
> cases, the answers are not fully known.
>
> But, off the top of my head, I believe there's been some success both
> modelling and measuring nanotubes as "Luttinger liquids" or "Tomonaga
> Luttinger liquids." As I understand it, the electrons are confined to
> the (effectively) one-dimensional structure of the tube, and begin to
> develop electron density phenomenon closely related to sound. (Yes,
> sound, as in atmospheric pressure density waves.) Snipped.

> --
> John S. Novak, III
> The Humblest Man On The Net



In the "Luttinger liquids", does the theory predict any kind of heat build
up in the nanotube structure. Nanotubes combust when exposed to radiation.
Pulickel Ajayan's laboratory at the Rensselaer Polytechnic Institute took
some flash photographs as part of another research project. "The
single-walled carbon nanotube samples in this situation were just a jumble
of tubes," Ajayan recalls. "They were not laid out in any pattern, and
because of that, the heat generated from the flash could not dissipate, so
the nanotubes just burned."


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