Original title: Direct Realization of Near-Ideal Carbyne in Ultrathin Boron Nitride Nanotubes
Iryna Ivanenko, Pietro Marabotti, Yifan Zhang, Getulio Silva e Souza Júnior +7 · September 2026
Carbyne is a one-dimensional chain of carbon atoms predicted to be the stiffest material known. Scientists have struggled to measure its true properties because chemical ends alter short chains, while growing chains inside carbon tubes alters their vibration frequencies. To solve this, researchers sealed hydrogen-capped carbon molecules inside tiny, electrically insulating boron nitride nanotubes and heated them into carbyne chains. The insulating tubes protect the chains while barely disturbing them. Tests showed the chains behave almost like free, isolated carbyne. Their vibration frequencies varied ten times less than chains inside carbon tubes. The spacing between alternating bonds matched theoretical predictions for a free chain. The material also showed no light emission, matching predictions that clean carbyne chains cannot emit light this way.
You are trying to measure the true length of a stretchy rope. Someone pulls on the ends, so the rope is stretched and you cannot see its natural length. In this paper, the boron nitride nanotube acts like a rigid tube that prevents the rope from being stretched, revealing the carbon chain's intrinsic properties.
Carbyne is predicted to be the stiffest known material, but impurities always masked its real properties. By placing it inside insulating boron nitride nanotubes, scientists eliminated those perturbations for the first time. This means we can now measure carbyne's true strength, flexibility, and optical behavior, crucial for future nanotechnologies.
The abstract does not report direct mechanical measurements of carbyne's stiffness, only vibrational and optical properties. The carbyne chains are described as near-ideal, not perfectly ideal, meaning some residual perturbations may remain. The study is limited to one synthesis method (thermal conversion in BNNTs) and one characterization technique (Raman spectroscopy).
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Direct Realization of Near-Ideal Carbyne in Ultrathin Boron Nitride Nanotubes — Iryna Ivanenko, Pietro Marabotti, Yifan Zhang et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.