Broad band (UV–VIS) photoluminescence from carbonized fumed silica: Emission, excitation and kinetic properties

Vasin, A. V.; Adlung, Matthias; Тертых, В. А.; Kysil, Dmytro; Gallis, Spyros; Nazarov, A. M.; Lysenko, V. S.

doi:10.1016/j.jlumin.2017.05.045

Cited by 8 publications

(9 citation statements)

References 42 publications

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“…Recently, it has been reported that carbon incorporated nanostructured silica exhibits strong photoluminescence in the near-UV and visible spectral range. [6][7][8][9][10][11][12] It was demonstrated that spectral properties of emission light can be tuned over the visible range as a function of the preparation conditions of such nanostructures. 6,12 The authors of Refs.…”

Section: Introductionmentioning

confidence: 99%

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Vasin

Kysil

Lajaunie

et al. 2018

Journal of Applied Physics

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Fumed silica with a specific area of 295 m 2 /g was carbonized by successive phenyltrimethoxysilane treatments followed by annealing in inert atmosphere up to 650 C. Emission, excitation, kinetics, and photo-induced bleaching effects were investigated by steady state and time-resolved photoluminescence spectroscopies. The local chemistry was also studied by infrared transmission spectroscopy. Strong ultraviolet and visible photoluminescence was observed in the samples after the chemical treatments/modifications and thermal annealing. It has been shown that ultraviolet photoluminescence in chemically modified fumed silica is associated with phenyl groups, while near ultraviolet and visible emission in annealed samples originated from inorganic pyrolytic carbon precipitates dispersed in the silica host matrix. Two types of emission bands were identified as a function of the annealing temperature: one is in the near UV and the other is in the visible range. Based on the emission/excitation analysis of these two bands, as well as on correlations with the synthesis conditions, a structural-energy concept of light-emitting centers has been proposed. According to this model, the light-emitting centers are associated with carbon clusters that can be bonded or adsorbed on the silica surface. This has been validated by a detailed (S)TEM-electron energy-loss spectroscopy study, confirming the inhomogeneous distribution of nanoscale carbon precipitates at the surface of the silica nanoparticles. These carbon precipitates are mostly amorphous although they possess some degree of graphitization and local order. Finally, the fraction of sp 2 carbon in these nanoclusters has been estimated to be close to 80%. Published by AIP Publishing. https://doi.

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Section: Introductionmentioning

confidence: 99%

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Vasin

Kysil

Lajaunie

et al. 2018

Journal of Applied Physics

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“…In our previous work the SiO 2 :C powder was produced by chemical treatment of fumed silica with tetramethoxysilane followed by the annealing at 700 °C . It has been demonstrated that light‐emission of carbonized fumed silica is assigned to precipitated carbon entities.…”

Section: Discussionmentioning

confidence: 99%

“…Many of the present‐day light‐emitting materials contain the impurities of heavy metals, including transitional and rare earth metals that have undesirable effects on the environment . Recently, it has been reported that nanostructured SiO 2 :C materials exhibit PL in the near ultraviolet and visible range . It has been demonstrated that spectral properties of the emitted light can be tuned by varying the synthesis conditions .…”

Section: Introductionmentioning

confidence: 99%

“…In early studies the broad band visible luminescence in SiO 2 :C/SiOC materials was ascribed preferably to optically active intrinsic point defects in amorphous silica network as well as to SiOC/SiC local bonds . However, it has been pointed out that in some cases such approach can hardly be used for proper interpretation of experimental observations . Alternative concept was discussed in refs.…”

Section: Introductionmentioning

confidence: 99%

“…Alternative concept was discussed in refs. , where light‐emitting centers have been associated with carbon precipitates in the form of subnanometer carbon clusters and/or carbon nanoparticles. The concept of light‐emitting carbon nanoparticles as dominant emission centers in SiO 2 :C nanocomposites attracts increasing attention of researchers .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO₂:C Nanocomposites

Vasin

Kysil

Ісаєва

et al. 2019

Physica Status Solidi (a)

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The effect of hydration procedure of fumed silica precursor on photoluminescent properties of carbonized silica (SiO2:C) nanocomposite after chemo/thermal treatments is studied. Main structural effect is the formation of chemical bonding of phenyl groups to silica surface via multiple CSiO bonding bridges. Synthesized samples demonstrate very broad photoluminescence (PL) bands in near ultraviolet and visible ranges with maximum intensity dependent on temperature of thermal annealing. Two main trends in luminescence properties are: 1) hydration‐induced blue shift of PL in comparison with PL of unhydrated series; 2) red shift of PL bands with increasing synthesis temperature regardless hydration procedure. Temperature dependent evolution of light emission bands is discussed in terms of surface carbon nanoclusters formation and aggregation processes. It is assumed that blue shift of PL bands in the hydrated series is associated with the decreased surface mobility of carbon atoms and clusters as a result of increased chemical bonding with silica surface that slows down carbon thermally stimulated clusterization/aggregation processes.

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Silicon Compound Nanomaterials: Exploring Emission Mechanisms and Photobiological Applications

Dutt,

Salinas,

Martínez-Tolibia

et al. 2023

Advanced Photonics Research

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After the first visible photoluminescence (PL) from porous silicon (pSi), continuous efforts are made to fabricate Si‐based compound nanomaterials embedded in matrices such as oxide, nitride, and carbide to improve optical performance and industrial acceptability. These nanomaterials’ functional and desired properties (nanoparticles and quantum dots embedded in matrices) can vary significantly when embedded in technologically relevant matrices. However, exploring the exact emission mechanisms is one of the remaining challenges from the past few decades. To cover this gap, this review discusses the morphological and optoelectronic properties of Si‐based compound nanomaterials and their correlation with the quantum confinement effect and different surface states to find precise emission mechanisms. One of the biggest challenges of using silicon nanomaterials in the biological sector is the development of sensitive materials of low/acceptable toxicity for identifying target analytes either inside/outside the biological platforms. In this scenario, silicon‐based compound matrices can offer different characteristics and advantages depending on their size configurations and PL emission mechanisms. On the other hand, a proper understanding of these multifaceted silicon nanomaterials’ optical properties (emission mechanisms) can be exploited for pathogen detection and in situ applications in cells and tissues, embarking on a new era of bioimaging technology.

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Broad band (UV–VIS) photoluminescence from carbonized fumed silica: Emission, excitation and kinetic properties

Cited by 8 publications

References 42 publications

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO₂:C Nanocomposites

Silicon Compound Nanomaterials: Exploring Emission Mechanisms and Photobiological Applications

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Broad band (UV–VIS) photoluminescence from carbonized fumed silica: Emission, excitation and kinetic properties

Cited by 8 publications

References 42 publications

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO2:C Nanocomposites

Silicon Compound Nanomaterials: Exploring Emission Mechanisms and Photobiological Applications

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Product

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Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO₂:C Nanocomposites