I strongly doubt we can even reach 1nm on a mass scale. Quantum tunneling will mess with that quite a bit: https://www.quora.com/What-is-Quantum-Tunneling-Limit

I strongly doubt we can even reach 1nm on a mass scale. Quantum tunneling will mess with that quite a bit: https://www.quora.com/What-is-Quantum-Tunneling-Limit-How-does-it-limit-the-size-of-a-transistor https://www.quora.com/What-is-Quantum-Tunneling-Limit-How-do...