AUTHOR=Orellana Walter , Pino-Rios Ricardo , Yañez Osvaldo , Vásquez-Espinal Alejandro , Peccati Francesca , Contreras-García Julia , Cardenas Carlos , Tiznado William 

TITLE=Cluster Assembled Silicon-Lithium Nanostructures: A Nanowire Confined Inside a Carbon Nanotube

JOURNAL=Frontiers in Chemistry

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2021.767421

DOI=10.3389/fchem.2021.767421

ISSN=2296-2646

ABSTRACT=<p>We computationally explore an alternative to stabilize one-dimensional (1D) silicon-lithium nanowires (NWs). The Li<sub>12</sub>Si<sub>9</sub> Zintl phase exhibits the NW <inline-formula id="inf1"><mml:math id="m1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mrow><mml:mo>[</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mn>6</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Si</mml:mtext></mml:mrow><mml:mn>5</mml:mn></mml:msub></mml:mrow><mml:mo>]</mml:mo></mml:mrow></mml:mrow><mml:mprescripts /><mml:mi>∞</mml:mi><mml:mn>1</mml:mn></mml:mmultiscripts></mml:mrow></mml:math></inline-formula>, combined with Y-shaped Si<sub>4</sub> structures. Interestingly, this NW could be assembled from the stacking of the Li<sub>6</sub>Si<sub>5</sub> aromatic cluster. The <inline-formula id="inf2"><mml:math id="m2" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mrow><mml:mo>[</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mn>6</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Si</mml:mtext></mml:mrow><mml:mn>5</mml:mn></mml:msub></mml:mrow><mml:mo>]</mml:mo></mml:mrow></mml:mrow><mml:mprescripts /><mml:mi>∞</mml:mi><mml:mn>1</mml:mn></mml:mmultiscripts></mml:mrow></mml:math></inline-formula>@CNT nanocomposite has been investigated with density functional theory (DFT), including molecular dynamics simulations and electronic structure calculations. We found that van der Waals interaction between Li’s and CNT’s walls is relevant for stabilizing this hybrid nanocomposite. This work suggests that nanostructured confinement (within CNTs) may be an alternative to stabilize this free NW, cleaning its properties regarding Li<sub>12</sub>Si<sub>9</sub> solid phase, i.e., metallic character, concerning the perturbation provided by their environment in the Li<sub>12</sub>Si<sub>7</sub> compound.</p>