A Universal Method to Transform Aromatic Hydrocarbon Molecules into Confined Carbyne inside Single-Walled Carbon Nanotubes

作者：Yingzhi Chen, Kunpeng Tang, Wendi Zhang, Huiju Cao, Hongwei Zhang, Yanghao Feng, Weili Cui, Yuan Hu, Lei Shi, Guowei Yang · 发表于：ACS Nano · 年份：2025 · DOI：10.1021/acsnano.4c18912 · 被引用次数：8 · 研究领域：Graphene research and applications、Fullerene Chemistry and Applications、Carbon Nanotubes in Composites

Carbyne, a sp 1 -hybridized allotrope of carbon, is a linear carbon chain with exceptional theoretically predicted properties that surpass those of sp 2 -hybridized graphene and carbon nanotubes (CNTs). However, the existence of carbyne has been debated due to its instability caused by Peierls distortion, which limits its practical development. The only successful synthesis of carbyne has been achieved inside CNTs, resulting in a form known as confined carbyne (CC). However, CC can only be synthesized inside multiwalled CNTs, limiting its property-tuning capabilities to the inner tubes of the CNTs. Here, we present a universal method for synthesizing CC inside single-walled CNTs (SWCNTs) with diameters of 0.9–1.3 nm. Aromatic hydrocarbon molecules are filled inside SWCNTs and subsequently transformed into CC under low-temperature annealing. A variety of aromatic hydrocarbon molecules are confirmed as effective precursors for the formation of CC, with Raman frequencies centered around 1861 cm –1 . Enriched (6,5) and (7,6) SWCNTs with diameters less than 0.8 nm are less effective than the SWCNTs with diameters of 0.9–1.3 nm for CC formation. Furthermore, resonance Raman spectroscopy reveals that the optical band gap of the CC at 1861 cm –1 is 2.353 eV, which is consistent with the result obtained using a linear relationship between the Raman frequency and optical band gap. This approach provides a versatile route for synthesizing CC from various precursor molecules inside diver...