Enhancement of QDs' fluorescence based on porous silicon Bragg mirror

Liu, Chao; Jia, Zhenhong; Lv, Xiaoyi; Lv, Changwu; Shi, Fugui

doi:10.1016/j.physb.2014.10.005

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…This enhancement cannot occur when the Bragg reflector bandgap is far beyond the C-dots fluorescence emission. Similar behavior was demonstrated for QDs embedded within PSi-based Bragg reflectors (or deposited on top of PSi Bragg reflectors; Liu et al, 2015 ; He et al, 2017 ; Li et al, 2017 ). Narrowing and shift of the emission spectra were also observed in similar hybrid systems in which QDs were confined within the pores of PSi photonic crystals (Dovzhenko et al, 2018a , b ).…”

Section: Resultssupporting

confidence: 62%

“…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 ).…”

Section: Introductionmentioning

confidence: 99%

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

2018

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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.

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Section: Resultssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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

2018

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“…23,24 Other studies have demonstrated the luminescence enhancement of the fluorophore molecules of QDs co-embedded within PSi host matrixes. 25,26 Herein, we report the fabrication of a bimodal sensing platform comprising C-dots integrated within a PSiO 2 host matrix. Importantly, the PSiO 2 /C-dot hybrid was constructed through a facile and robust single-step synthetic scheme in which the carbon precursor was incorporated into the PSiO 2 matrix, and subsequent heating generated the encapsulated C-dots.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

et al. 2018

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A new hybrid guest-host material consisting of a Fabry-Pérot porous silicon (PSi) thin film, a nanostructured high surface-area matrix, and encapsulated fluorescent carbon quantum dots (C-dots) is described. The hybrid is synthesized by a facile in situ pyrolysis treatment of the carbonaceous precursor incorporated within the nanoscale pores of the inorganic host. The effects of nanoconfinement on the integrity of the C-dots and their optical properties are characterized. We show that the resulting hybrid allows for label-free optical detection of target molecules using two orthogonal modalities, that is, the white-light reflectivity of the PSi matrix and the fluorescence of the confined C-dots, and these two signals can be observed and collected simultaneously. The resulting hybrid system exhibits superior sensing performance in comparison with that of the individual components. Notably, we demonstrate that the confined C-dots exhibit greater sensitivity toward various analytes as well as an improved linear response, thus providing evidence of the impact of the host nanoscale porous scaffold on the optical properties of the C-dots. Moreover, we show that this orthogonal detection scheme increases the dynamic range of the sensor and minimizes falsenegative results.

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“…In recent years, some new advances in the fluorescence enhancement analysis of the probe molecules on the PSi Bragg mirror obtained by our group are summarized. When the fluorescence emission peak of the probe molecules falls into the high reflection band of PSi Bragg reflector, the fluorescence intensity of the probe can be increased [ 16 ]; DNA has been specifically selected by fluorescence resonance energy transfer(FRET) from quantum dots and Au NPs on PSi Bragg reflector substrate [ 17 ]. However, few studies are concerned with the PSi photonic crystal fluorescence enhancement for biological detection [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Metal Nanoparticles/Porous Silicon Microcavity Enhanced Surface Plasmon Resonance Fluorescence for the Detection of DNA

Wang

Jia

2018

Sensors

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A porous silicon microcavity (PSiMC) with resonant peak wavelength of 635 nm was fabricated by electrochemical etching. Metal nanoparticles (NPs)/PSiMC enhanced fluorescence substrates were prepared by the electrostatic adherence of Au NPs that were distributed in PSiMC. The Au NPs/PSiMC device was used to characterize the target DNA immobilization and hybridization with its complementary DNA sequences marked with Rhodamine red (RRA). Fluorescence enhancement was observed on the Au NPs/PSiMC device substrate; and the minimum detection concentration of DNA ran up to 10 pM. The surface plasmon resonance (SPR) of the MC substrate; which is so well-positioned to improve fluorescence enhancement rather the fluorescence enhancement of the high reflection band of the Bragg reflector; would welcome such a highly sensitive in biosensor.

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Enhancement of QDs' fluorescence based on porous silicon Bragg mirror

Cited by 18 publications

References 23 publications

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

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

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

Metal Nanoparticles/Porous Silicon Microcavity Enhanced Surface Plasmon Resonance Fluorescence for the Detection of DNA

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