Graphene oxide is known from 2004.

Nano coronavirus recombinant vaccine taking graphene oxide as carrier - https://patents.google.com/patent/CN112220919A/en

That's a patent, if you weren't aware.

but so far zero proof in the wild.

I am sure you can never find any proof, if you're never looking for it.

Not in a single one have I seen

That's the trick...space so big and nano so small one cannot perceive it without others suggesting it.

Sleight of hand...Mork & Mindy aka mork/myrk - "darkness" and mindy - "mind".

Nanu-Nanu..."unless you can say no (nano) there will be no pieces left for yourself"... https://www.youtube.com/watch?v=G9xPivDPrCc

talking heads...keep piling up on their own narratives

It's those who consent that are keeping the narrated (narrative) stories (talk) within mind/memory. Those who consent to suggested are claiming ownership.

it is very difficult to take

NaNO-NaNO...it's very tempting to take and very hard to resist that temptation by letting go.