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Although single‐wall carbon nanotubes (SWCNTs) exhibit various colors in suspension, directly synthesized SWCNT films usually appear black. Recently, a unique one‐step method for directly fabricating green and brown films has been developed. Such remarkable progress, however, has brought up several new questions. The coloration mechanism, potentially achievable colors, and color controllability of...
Graphene and graphite are black and pure diamonds are colorless to the human eye; however, single‐wall carbon nanotubes are colorful. In article number 2006395, Esko I. Kauppinen and co‐workers explain experimentally how these stable colors of carbon nanotubes form, and also demonstrate their brilliance and range. It is surprising that these molecules of pure carbon, like gems, can exhibit a full...
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