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[2605.27250] Atomically precise mechanosynthesis of carbon structures on hydrogenated Si(100) by inverted-mode STM

arxiv.org · 6,744 words · saved by 1 readers

Abstract:The 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. Using inverted-mode STM, C$_2$ units are donated from surface-deposited molecules to pre-patterned reactive sites on a hydrogen-passivated Si(100) surface. We demonstrate single-site C$_2$ donation, spatially patterned multi-site C$_2$ 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.

# link_1w2zo7zzqxn.pdf ## Metadata - PDFFormatVersion=1.7 - IsLinearized=false - IsAcroFormPresent=false - IsXFAPresent=false - IsCollectionPresent=false - IsSignaturesPresent=false - Author=Megan Cowie; Chris Deimert; Ryan Groome; Alex Inayeh; Robert J. Kirby; Cameron J. Mackie; Jonathan Myall; Sam Rohe; Luis Sandoval; Khalil Sayed-Akhmad; Bheeshmon Thanabalasingam; Reid Wotton; Rafik Addou; Aly Asani; Brandon Blue; Adam Bottomley; Kareem A. Clarcia; Tyler Enright; James Zhangming Fan; Robert A. Freitas Jr. au2; Alan T. K. Godfrey; Si Yue Guo; Aru Hill; Taleana Huff; Mark Jobes; Hadiya Ma; Ad

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