近日，中国地质大学Ruijin Sun团队研究了反应性盐流中的基因遗传[Se₂]二聚体：准一维NbSe₂超导体的合成。这一研究成果发表在2025年7月1日出版的《美国化学会志》上。

过渡金属二硫族化合物（TMDs）由于其优异的性能在许多领域受到了广泛的关注。现有的热稳定TMD在结构上几乎是二维或三维的；因此，合成新的低维动态稳定的TMD在材料科学和化学领域具有重要意义。

以低熔点的K₂Se₂为反应盐助熔剂，研究组合成了一种具有一维Nb[Se₂]链的新型NbSe₂。在该反应中，K₂Se₂中的[Se₂]二聚体像“基因”一样被1D-NbSe₂“遗传”，使材料的维数降至1D，产生新的亚稳相。

研究组从形貌、结构、氧化价态和声子振动等方面证实了一维链结构的存在。磁性和电学性能测试表明，样品在正常状态下表现为顺磁性金属，在9.5 K以下表现出超导性。在这项工作中，研究组强调了获得一系列低维新型MQ2 （M = metal, Q = S, Se, Te）的机会，这将激发未来材料科学的努力。

附：英文原文

Title: Gene-Inherited [Se2] Dimers in a Reactive Salt Flux: Synthesis of a Quasi-One-Dimensional NbSe2 Superconductor

Author: Ruijin Sun, Haodong Li, Duo Zhang, Dezhong Meng, Changchun Zhao, Shifeng Jin

Issue&Volume: July 1, 2025

Abstract: Transition metal dichalcogenides (TMDs) have attracted much attention due to their excellent properties in many fields. The existing thermodynamically stable TMDs are almost two-dimensional or three-dimensional in structure; therefore, the synthesis of new kinetic stable TMDs with lower dimensions is of great significance in materials science and chemistry. Here, we demonstrated the synthesis of a new type of NbSe2 with one-dimensional (1D) Nb[Se2] chains by using K2Se2 with low melting points as the reactive salt fluxes. In this reaction, the [Se2] dimers in K2Se2, acting like “genes”, are “inherited” by the 1D-NbSe2, reducing the dimension of the material to 1D and generating a new metastable phase. Several measurements confirmed the existence of a 1D chain structure from the aspects of morphology, structure, oxidation valence state, and phonon vibration. Magnetic and electrical property measurements show that the samples behave as paramagnetic metals in the normal state and exhibit superconductivity below 9.5 K. In this work, we highlight the opportunity to gain a series of low-dimensional new type MQ2 (M = metal, Q = S, Se, Te) that will inspire future efforts in material science.

DOI: 10.1021/jacs.5c05796

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.5c05796