Continuous-Mode Laser Ablation at the Solid–Liquid Interface of Pelletized Low-Cost Materials for the Production of Luminescent Silicon Carbide Nanocrystals

Ortega-Liebana, M. C.; Hueso, José L.; Arenal, Raúl; Lahoz, Ruth; Fuente, G.F. de la; Santamarı́a, Jesús

doi:10.1021/jp509594g

Cited by 16 publications

(9 citation statements)

References 63 publications

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“…1(b)] match the fine structures of SiO 2 . [21][22][23] In addition, it should be noted that the EELS response of the smallest and biggest nanoparticles is similar. Thus, this means that the only differences between the two kinds of nanoparticles regard their size and morphology and not their composition.…”

Section: Resultsmentioning

confidence: 91%

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: Resultsmentioning

confidence: 91%

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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“…Examples include fcc silicon crystals and nanodiamonds . CW laser-induced NP fabrication is a separate branch of the LSPC tree relative to pulsed lasers because it occurs via a purely photothermal process . The CW laser excitation of particles reveals how particle surfaces evaporate, , and varying the exposure time and laser intensity may help elucidate the nanoscale cooling effects of substrates and the surrounding media for a single gold NP …”

Section: Material Process Liquid and Laser Parametersmentioning

confidence: 99%

“…773 CW laser-induced NP fabrication 140 is a separate branch of the LSPC tree relative to pulsed lasers because it occurs via a purely photothermal process. 774 The CW laser excitation of particles reveals how particle surfaces evaporate, 139,775 and varying the exposure time and laser intensity may help elucidate the nanoscale cooling effects of substrates and the surrounding media for a single gold NP. 776 Figure 60a,b shows that the temperature distribution of Au NPs strongly depends on the difference in the thermal conductivity between the substrate and the liquid medium.…”

Section: Chemical Reviewsmentioning

confidence: 99%

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

2017

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Driven by functionality and purity demand for applications of inorganic nanoparticle colloids in optics, biology, and energy, their surface chemistry has become a topic of intensive research interest. Consequently, ligand-free colloids are ideal reference materials for evaluating the effects of surface adsorbates from the initial state for application-oriented nanointegration purposes. After two decades of development, laser synthesis and processing of colloids (LSPC) has emerged as a convenient and scalable technique for the synthesis of ligand-free nanomaterials in sealed environments. In addition to the high-purity surface of LSPC-generated nanoparticles, other strengths of LSPC include its high throughput, convenience for preparing alloys or series of doped nanomaterials, and its continuous operation mode, suitable for downstream processing. Unscreened surface charge of LSPC-synthesized colloids is the key to achieving colloidal stability and high affinity to biomolecules as well as support materials, thereby enabling the fabrication of bioconjugates and heterogeneous catalysts. Accurate size control of LSPC-synthesized materials ranging from quantum dots to submicrometer spheres and recent upscaling advancement toward the multiple-gram scale are helpful for extending the applicability of LSPC-synthesized nanomaterials to various fields. By discussing key reports on both the fundamentals and the applications related to laser ablation, fragmentation, and melting in liquids, this Article presents a timely and critical review of this emerging topic.

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“…The width of each box indicates the range of particle sizes that can be fabricated with the respective technique to date. The main techniques are laser ablation, [ 18–24 ] milling, [ 25–28 ] various etching techniques, [ 17,29,30–37,38–41 ] and thermal reduction of Si‐ and C‐based precursors. [ 42–44 ]…”

Section: Sic Nanoparticlesmentioning

confidence: 99%

Fluorescent Silicon Carbide Nanoparticles

Vries

Sato

Ohshima

et al. 2021

Advanced Optical Materials

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Silicon carbide (SiC) is an indirect wide band gap semiconductor that is utilized in many industrial applications due to its extreme physical properties. SiC nanoparticles (NPs) exhibit a versatile surface chemistry, fluoresce from the ultraviolet to the near‐infrared spectral ranges, and their sizes can be tuned from one to hundreds of nanometers. Yet, fluorescent SiC NPs have received far less attention by the scientific community. This review summarizes the state‐of‐the‐art in fluorescent SiC NPs. Nanoparticle fabrication methods, characterization techniques, nanoparticle surface chemistry, and SiC NPs fluorescence properties are assessed in detail. Atomic defects and impurities in the SiC crystal lattice (so‐called color centers), surface‐induced fluorescence, quantum confinement, and band‐edge fluorescence are identified as the main sources of fluorescence in SiC NPs. While many color centers are reported in bulk SiC, only few are identified in SiC NPs and interface‐related defects remain poorly understood, creating enormous potential for scientific discovery. Finally, an overview of demonstrated and emerging potential applications of SiC NPs in the areas of bioimaging and quantum sensing is provided.

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Continuous-Mode Laser Ablation at the Solid–Liquid Interface of Pelletized Low-Cost Materials for the Production of Luminescent Silicon Carbide Nanocrystals

Cited by 16 publications

References 63 publications

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Multiband light emission and nanoscale chemical analyses of carbonized fumed silica

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

Fluorescent Silicon Carbide Nanoparticles

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