I don't think you'd need to bond them. I imagine you could put down a "wire" of metal atoms without too much trouble. Something like a capacitor shouldn't be t

I don't think you'd need to bond them. I imagine you could put down a "wire" of metal atoms without too much trouble. Something like a capacitor shouldn't be too difficult if you could put down a dielectric. Not sure about how to do a transistor - maybe there could be an alternative "switch". Yeah, I'm hand-waving. And maybe the metal substrate an STM uses is a non-starter. But still, atomic precision seems to be in hobbyists reach and I imagine SOME approach to low volume tiny circuits are possible that would not be economically viable in terms of RnD and fab for "big silicon".