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

Frontiers in Chemistry

Naama Massad-Ivanir¹  Susanta Kumar Bhunia²  Raz Jelinek³  Ester Segal⁵ 

[1] Department of Biotechnology and Food Engineering, Technion–Israel Institute of Technology, Haifa, Israel;Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, Israel;Ilse Katz Institute for Nanotechnology, Ben Gurion University of the Negev, Beer Sheva, Israel;Schulich Faculty of Chemistry, Technion–Israel Institute of Technology, Haifa, Israel;The Russell Berrie Nanotechnology Institute, Technion–Israel Institute of Technology, Haifa, Israel;

关键词: porous silicon;    carbon dots;    Bragg reflectors;    photoluminescence;    fluorescence;    Fabry–Pérot;   

DOI  :  10.3389/fchem.2018.00574

来源: DOAJ

【 摘 要 】

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 by confocal and 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. Notably, their fluorescence emission can be significantly enhanced 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.

【 授权许可】

Unknown