石墨烯-介孔硅纳米复合材料的结构、光学和太赫兹特性

Structural, optical and terahertz properties of graphene-mesoporous silicon nanocomposites.

作者信息

Jubgang Fandio Défi Junior, Sauze Stéphanie, Boucherif Abderraouf, Arès Richard, Morris Denis

机构信息

Département de Physique, Regroupement Québecois sur les Matériaux de Pointe, Université de Sherbrooke 2500 Boulevard Université Sherbrooke Québec Canada J1K 2R1

Laboratoire Nanotechnologies Nanosystèmes, (LN2)-CNRS UMI-3463, Institut Interdisciplinaire d'Innovation Technologique (3IT), Université de Sherbrooke 3000 Boulevard Université Sherbrooke, Québec Canada J1K 0A5.

出版信息

Nanoscale Adv. 2019 Nov 25;2(1):340-346. doi: 10.1039/c9na00502a. eCollection 2020 Jan 22.

DOI:10.1039/c9na00502a

PMID:36133992

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9418058/

Abstract

We investigate the structural, optical and terahertz properties of graphene-mesoporous silicon nanocomposites using Raman, terahertz time-domain and photoluminescence spectroscopy. The nanocomposites consist of a free-standing mesoporous silicon membrane with its external and pore surfaces coated with few-layer graphene. Results show a stabilization of the porous silicon morphology by the graphene coating. The terahertz refractive index and absorption coefficient were found to increase with graphene deposition temperature. Four bands in the 1.79-2.2 eV range emerge from the PL spectra of the nanocomposites. The broad bands centered at 1.79 eV and 1.96 eV were demonstrated to originate from Si nanocrystallites of different sizes. The narrower bands at 2.11 eV and 2.14 eV could be related to a thin SiC film at the Si/C interface.

摘要

我们使用拉曼光谱、太赫兹时域光谱和光致发光光谱研究了石墨烯-介孔硅纳米复合材料的结构、光学和太赫兹特性。该纳米复合材料由一个独立的介孔硅膜组成，其外表面和孔表面涂覆有几层石墨烯。结果表明，石墨烯涂层使多孔硅形态得以稳定。发现太赫兹折射率和吸收系数随石墨烯沉积温度的升高而增加。纳米复合材料的光致发光光谱在1.79-2.2电子伏特范围内出现了四个波段。以1.79电子伏特和1.96电子伏特为中心的宽波段被证明源自不同尺寸的硅纳米晶体。在2.11电子伏特和2.14电子伏特处较窄的波段可能与硅/碳界面处的一层薄碳化硅薄膜有关。