Scanning electron microscope images reveal a borophene sheet containing domains with different periodic assemblies of known hexagon-to-triangle ratios of 1-to-5 and 1-to-6 rows, along with two previously unobserved phases of 7-to-36 and 4-to-21. Scientists at Rice and Northwestern universities made the first detailed analysis of ordered defect structures in borophene. (Credit: Hersam Research Group/Northwestern University

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