Another research paper on Atomically Precise Manufacturing (Drexlerian Nanotechnology)

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atomically-precise-manufacturing nanotechnology scanning-tunneling-microscopy mechanosynthesis molecular-assembler radical-chemistry silicon

Summary

This paper demonstrates the first successful positional control of adding and removing individual atoms on a silicon surface using inverted-mode scanning tunneling microscopy, representing a foundational step toward molecular assemblers.

https://arxiv.org/abs/2606.13876 Enabled by inverted-mode scanning tunneling microscopy (IM-STM) and the use of functionalized molecular tools, we demonstrate positionally-controlled mechanosynthetic addition (donation) of carbon and subtraction (abstraction) of silicon atoms on a model build site: atomically clean and crystalline Si(100). The resulting structures represent the first demonstrations of an emerging ability to manipulate radical chemistry with positional control of specific atoms and moieties in 3D. Furthermore, by comparing the behavior of molecular tools designed for atomic donation versus abstraction, we highlight general principles governing molecular tool design for selective and reliable mechanosynthetic functionality. The paper demonstrates two of the basic operations that any future molecular assembler would need: adding atoms where you want them and removing atoms where you want them. Tea. Earl Grey. Hot, when?
Original Article

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