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Advances in Porous Semiconductor Research

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Front. Chem. | doi: 10.3389/fchem.2018.00574

Porous Silicon Bragg Reflector/Carbon Dot Hybrids: Synthesis, Nanostructure and Optical Properties

 Naama Massad-Ivanir1, Susanta K. Bhunia1, 2, Raz Jelinek2 and  Ester Segal1*
  • 1Department of Biotechnology and Food Engineering, Technion – Israel Institute of Technology, Israel
  • 2Department of Chemistry, Ben-Gurion University of the Negev, Israel

Carbon dots (C-dots) exhibit unique fluorescence properties, mostly depending upon their physical environments. Here we investigate the optical properties and nanostructure of Carbon dots (C-dots) which are synthesized in situ within different porous Silicon (PSi) Bragg reflectors. The resulting hybrids were characterized by photoluminescence, X-ray photoelectron, and Fourier Transform Infrared spectroscopies, as well as confocal transmission electron microscopy. We show that by tailoring the location of the PSi Bragg reflector photonic bandgap and its oxidation level, the C-dots emission spectral features can be tuned. Importantly, enhancement of the fluorescence emission is achieved when the high reflection band of the PSi host overlaps with the confined C-dots' peak wavelength and the PSi matrix is thermally oxidized at mild conditions. These phenomena are observed for multiple compositions of PSi Bragg reflectors/C-dots hybrids.

Keywords: Porous - medium/fluid interface, Silicon, Carbon dot nanoparticle, Bragg reflection, Photoluinescence, Florescence, Optical properites, Fabry - Perot

Received: 18 Sep 2018; Accepted: 05 Nov 2018.

Edited by:

Nicolas H. Voelcker, Monash University, Australia

Reviewed by:

Raul J. Martin-Palma, Universidad Autónoma de Madrid, Spain
Abel Santos, University of Adelaide, Australia  

Copyright: © 2018 Massad-Ivanir, Bhunia, Jelinek and Segal. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Ester Segal, Technion – Israel Institute of Technology, Department of Biotechnology and Food Engineering, Haifa, Israel, esegal@technion.ac.il