Hettler Simon, Sreedhara M B, Serra Marco, Sinha Sudarson S, Popovitz-Biro Ronit, Pinkas Iddo, Enyashin Andrey N, Tenne Reshef, Arenal Raul
Instituto de Nanociencia de Aragón, Universidad de Zaragoza, 50018 Zaragoza, Spain.
Department of Physical Chemistry, Center for Biomedical Research (CINBIO), Universidad de Vigo, 36310 Vigo, Spain.
ACS Nano. 2020 May 26;14(5):5445-5458. doi: 10.1021/acsnano.9b09284. Epub 2020 May 11.
We present the analysis of a family of nanotubes (NTs) based on the quaternary misfit layered compound (MLC) YLaS-TaS. The NTs were successfully synthesized within the whole range of possible compositions the chemical vapor transport technique. In-depth analysis of the NTs using electron microscopy and spectroscopy proves the in-phase (partial) substitution of La by Y in the (La,Y)S subsystem and reveals structural changes compared to the previously reported LaS-TaS MLC-NTs. The observed structure can be linked to the slightly different lattice parameters of LaS and YS. Raman spectroscopy and infrared transmission measurements reveal the tunability of the plasmonic and vibrational properties. Density-functional theory calculations showed that the YLaS-TaS MLCs are stable in all compositions. Moreover, the calculations indicated that substitution of La by Sc atoms is electronically not favorable, which explains our failed attempt to synthesize these MLC and NTs thereof.
我们展示了基于四元错配层状化合物（MLC）YLaS-TaS的纳米管（NTs）家族的分析。通过化学气相传输技术，在所有可能的组成范围内成功合成了NTs。使用电子显微镜和光谱对NTs进行的深入分析证明了在（La，Y）S子系统中Y对La的同相（部分）取代，并揭示了与先前报道的LaS-TaS MLC-NTs相比的结构变化。观察到的结构可能与LaS和YS略有不同的晶格参数有关。拉曼光谱和红外透射测量揭示了等离子体和振动特性的可调性。密度泛函理论计算表明，YLaS-TaS MLC在所有组成中都是稳定的。此外，计算表明用Sc原子取代La在电子方面是不利的，这解释了我们合成这些MLC及其NTs的尝试失败的原因。
