Covalent modification of carbon nanotubes is a promising strategy for engineering their electronic structures. However, keeping modification sites in registration with a nanotube lattice is challenging. We report a solution using DNA-directed, guanine (G)-specific cross-linking chemistry. Through DNA screening we identify a sequence, C 3 GC 7 GC 3 , whose reaction with an (8,3) enantiomer yields minimum disorder-induced Raman mode intensities and photoluminescence Stokes shift, suggesting ordered defect array formation. Single-particle cryo–electron microscopy shows that the C 3 GC 7 GC 3 functionalized (8,3) has an ordered helical structure with a 6.5 angstroms periodicity. Reaction mechanism analysis suggests that the helical periodicity arises from an array of G-modified carbon-carbon bonds separated by a fixed distance along an armchair helical line. Our findings may be used to remodel nanotube lattices for novel electronic properties.

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DNA引导的碳纳米管晶格重塑

碳纳米管的共价修饰是设计其电子结构的一种有前途的策略。然而，保持修饰位点与纳米管晶格对齐是具有挑战性的。我们报告了一种使用 DNA 导向的鸟嘌呤 (G) 特异性交联化学的解决方案。通过 DNA 筛选，我们确定了一个序列，C3GC7GC3，其与 (8,3) 对映体的反应产生最小的无序诱导拉曼模式强度和光致发光斯托克斯位移，表明有序缺陷阵列的形成。单粒子冷冻电子显微镜显示 C3GC7GC3功能化 (8,3) 具有有序螺旋结构，周期为 6.5 埃。反应机理分析表明，螺旋周期性源于沿扶手椅螺旋线以固定距离分隔的一系列 G 修饰的碳-碳键。我们的发现可用于重塑纳米管晶格以获得新的电子特性。