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However, conventional syntheses produce only large-diameter (&gt;10 nm), multiwalled tubes with uncontrolled chiralities. We report the synthesis of single-walled molybdenum disulfide (MoS\n                    <jats:sub>2<\/jats:sub>\n                    ) nanotubes with diameters approaching 1 nm, achieved through spatially confined reactions inside boron nitride (BN) nanotubes. The confined geometry stabilizes otherwise inaccessible, highly strained MoS\n                    <jats:sub>2<\/jats:sub>\n                    nanotubes, yielding structurally well-defined armchair configurations. Their bandgaps shrink systematically with decreasing diameter, in accordance with long-standing theoretical predictions. The insulating BN sheath simultaneously provides an intrinsic gate-all-around architecture, thereby promising access to truly nanoscale transistor channels.\n                  <\/jats:p>","DOI":"10.1126\/science.aee3446","type":"journal-article","created":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T18:03:47Z","timestamp":1780596227000},"page":"1061-1064","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":2,"title":["Confined growth of armchair MoS\n                    <sub>2<\/sub>\n                    nanotubes at the 1-nm limit"],"prefix":"10.1126","volume":"392","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8782-9556","authenticated-orcid":true,"given":"Yusuke","family":"Nakanishi","sequence":"first","affiliation":[{"name":"Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Japan."},{"name":"Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science 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