Enhancement of the photoluminescence property of hybrid structures using single-walled carbon nanotubes/pyramidal porous silicon surface

Abstract

This work presents additional physical results about the enhancement of the photoluminescence property of hybrid structures using single walled carbon nanotubes/pyramidal porous silicon surface, in comparison with what has already been published on these structures in terms of synthesis conditions and FTIR investigations as reported recently by the same authors in Journal of Alloys and Compounds 694 (2017) 1036 1044. Herein, the effect of the single walled carbon nanotubes (SWCNTs) layer on the optical properties of pyramidal Porous Silicon (pPSi) in hybrid SWCNTs/pPSi structure synthetized by chemical and electrochemical etching of silicon wafer was studied. Using both scanning electron mi croscopy (SEM), SWCNTs formed a thin film on pPSi surface and they are partly embedded in its pores. An analysis of Raman spectra for the realized structures confirmed the passivation of pPSi surface by SWCNTs film. The surface bond configurations were also monitored. Moreover, SWCNTs modified Pho toluminescence (PL) spectrum of pPSi by shifting PL peaks towards high energies, showed that the defect created in the materials can result in an efficient and stabilized photoluminescence response on Silicon (Si).

The structure and photoluminescence of a ZnO phosphor synthesized by the sol gel method under praseodymium doping

“…the distribution of traps in the material. 68,69 The incorporation of Pr 3+ ion affects at least as much the substance's order as the structure impurities in ZnO. 70…”

Unprecedented atomic surface of silicon induced by environmentally friendly chemical mechanical polishing

“…The vibration of the Si-O bonds resulted in the absorption peak at about 460 cm −1 . 49,50 The FTIR pattern of monocrystalline silicon after CMP similarly exhibits an apparent absorption peak at about 1095 cm −1 , although the peak is narrowed. This peak may be impacted by Si-O-Ce and also occurs in this area.…”

Porous Silicon-Based Photonic Biosensors: Current Status and Emerging Applications

“…As already mentioned, one of the most advantageous properties of PSi is its large surface area (up to 800 m 2 g –1 ) and high internal volume, allowing for numerous biomolecular interactions to occur over a small working area. Furthermore, PSi can serve as a host matrix for diverse compounds and nanomaterials, including polymers, − metals, − quantum dots (QDs), − fluorescent molecules, − graphene oxide (GO), − carbon nanotubes (CNTs), , and carbon dots (C-dots) . The main advantage of these PSi-based hybrid systems is that they can exhibit superior sensing performance in comparison to the individual components, such as signal enhancement, higher sensitivity, improvement of signal stability, and dual-mode detection.…”

“…Studies on the incorporation of carbon-based materials, such as graphene oxide (GO) − and carbon nanotubes (CNTs), ,, into different PSi nanostructures have shown interesting optical properties of the resulting hybrids. For example, GO/PSi hybrid systems were found to exhibit significant PL enhancement and were therefore suggested as potentially suitable transducers for biosensing applications .…”