Atomically precise carbon structure fabrication demonstrated using inverted-mode STM mechanosynthesis
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[Submitted on 26 May 2026]
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Summary
Researchers demonstrate atomically precise mechanosynthesis of carbon structures on a hydrogen-passivated Si(100) surface using inverted-mode scanning tunneling microscopy (STM). C₂ units are donated from surface-deposited molecules to pre-patterned reactive sites, enabling single-site donation, multi-site patterned donation, and stepwise assembly of polyyne structures through successive C-C bond formation. This work establishes controlled mechanosynthetic donation as a foundational capability for programmable atomically precise fabrication at the nanoscale.
Key quotes
· 4 pulledThe ability to build atomically precise structures on surfaces with complete control over both atomic placement and chemical bonding remains a central challenge in nanoscale fabrication.
Here, we demonstrate simultaneous spatial and chemical control over the mechanosynthetic fabrication of carbon structures.
We demonstrate single-site C₂ donation, spatially patterned multi-site C₂ donation, and the stepwise assembly of polyyne structures through successive C-C bond formation.
Together, these results establish controlled mechanosynthetic donation as a foundational capability for programmable atomically precise fabrication.
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