Issue 1, 2020

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

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.

Graphical abstract: Structural, optical and terahertz properties of graphene-mesoporous silicon nanocomposites

Supplementary files

Article information

Article type
Paper
Submitted
13 8 2019
Accepted
23 11 2019
First published
25 11 2019
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2020,2, 340-346

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

D. J. Jubgang Fandio, S. Sauze, A. Boucherif, R. Arès and D. Morris, Nanoscale Adv., 2020, 2, 340 DOI: 10.1039/C9NA00502A

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