Porous Silicon Microcavity Modulates the Photoluminescence Spectra of Organic Polymers and Quantum Dots

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.…”

The Enhanced Sensitivity of a Porous Silicon Microcavity Biosensor Based on an Angular Spectrum Using CdSe/ZnS Quantum Dots

“…The first is to use the fluorescence characteristics of QDs to achieve fluorescence enhancement. Dovzhenkoab et al successfully embedded CdSe/ZnS QDs and poly(phenylenediamine) derivative (MDMO-PPV and BEHP-co-MEH-PPV) fluorescent molecules into a PSM to modulate fluorescence enhancement and bandwidth compression [18]. Y. Li et al added QD-labeled biotin, phosphate buffer solution (PBS), and unlabeled biotin to a streptavidin-modified PSI, which proves the feasibility of porous silicon optical biosensors based on QD fluorescence labeling, and then detected SA with different concentrations; the detection limit was 100 pM [19].…”

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

“…Porous silicon (PSi)-based nanostructures have been widely reported as potential host matrices for light emitting materials, including organic dyes (Palestino et al, 2008 ; Jenie et al, 2014 , 2015 ; Krismastuti et al, 2014 ; Mo et al, 2017 ) and quantum dots (QDs) (DeLouise Lisa and Ouyang, 2009 ; Qiao et al, 2010 ; Gaur et al, 2011 , 2013 ; Dovzhenko et al, 2015 , 2018a ; Liu et al, 2015 ; Dovzhenko D. S. et al, 2016 ; Li et al, 2017 ; Zhang et al, 2017 ). PSi-based photonic crystals hosts [e.g., Bragg reflector (Liu et al, 2015 ; He et al, 2017 ; Li et al, 2017 ) and microcavities (Jenie et al, 2014 , 2015 )] have been shown to affect the propagation and distribution of the light emitted by the guest fluorophores (Pacholski, 2013 ; Dovzhenko D. et al, 2016 ; Dovzhenko D. S. et al, 2016 ). Specifically, PSi-based microcavities have been shown to improve the spectral properties of emitting molecules, e.g., quantum yield, photostability and luminescence lifetime, by alignment between the reflectance spectrum dip of the microcavity and the emission of the fluorophores (Jenie et al, 2016 ).…”