One idea is to utilize the interior of a carbon nanotube as a reaction site:
Carbon nanotubes offer the potential advantage of giving only one degree of freedom for a reaction co-ordinate.
The Higher Diamondoid diamantane (C14H20) fits ideally inside a (7,7) CNT. The paper mentions functionalizing reaction sites of adjacent diamondoids (inside the CNT) with Boron and Nitrogen, but I wonder if it would be possible to polymerize (combine) two adjacent Diamondoids that have each had one or more their opposing hydrogen atoms removed? Building structures of interlocking diamond wire would be simpler without the Boron and Nitrogen.

My main novelty to introduce is the idea of nested CNTs. The reaction site is in the middle of a MWCNT. Each concentric interior tube “layer” consists of two tubes actuated at each end (say, by an SPM); can be withdrawn nearly all the way or inserted right to the reaction site as need be.
Product buildup would consist of joining two adjacent diamantane molecules within the open-ended MWCNT that have (somehow) been functionalized or hydrogen depassivated. Then after a long enough diamond chain has been constructed, remove some of the innermost interior CNTs, allow the diamond wire to rotate (perhaps doping and an electric field could help here) perpendicular to the CNT’s length. Then *reinsert* the inner most tubes to “clamp” the diamond wire in place. Find some method of functionalizing/depassivating a reaction site on the clamped diamond wire (run an STM over a custom-created opening in the MWCNT sidewall?), and you now have the ability to maybe 3D Higher Dimaond mesh. “y”-shaped CNTs could be used as the reaction site if three actuating devices are required for a given reaction.

Higher Diamondoid mesh isn’t likely to be rigid enough for some/most/any nanofac components. I have no idea how the many CNT layers would connect with SPMs at the ends of the CNT layers. Certainly this technique is beyond today’s nanotechnology mastery. I doubt diamond wire mesh would even be strong enough to form the walls for an UHV chamber.

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