Relevant bibliographies by topics / Fluorescence Silicon Nanoparticles

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Academic literature on the topic 'Fluorescence Silicon Nanoparticles'

Author: Grafiati
Published: 7 September 2023

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Journal articles on the topic "Fluorescence Silicon Nanoparticles"

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Zabotnov, Stanislav V., Anastasiia V. Skobelkina, Ekaterina A. Sergeeva, Daria A. Kurakina, Aleksandr V. Khilov, Fedor V. Kashaev, Tatyana P. Kaminskaya, et al. "Nanoparticles Produced via Laser Ablation of Porous Silicon and Silicon Nanowires for Optical Bioimaging." Sensors 20, no. 17 (August 28, 2020): 4874. http://dx.doi.org/10.3390/s20174874.

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Modern trends in optical bioimaging require novel nanoproducts combining high image contrast with efficient treatment capabilities. Silicon nanoparticles are a wide class of nanoobjects with tunable optical properties, which has potential as contrasting agents for fluorescence imaging and optical coherence tomography. In this paper we report on developing a novel technique for fabricating silicon nanoparticles by means of picosecond laser ablation of porous silicon films and silicon nanowire arrays in water and ethanol. Structural and optical properties of these particles were studied using scanning electron and atomic force microscopy, Raman scattering, spectrophotometry, fluorescence, and optical coherence tomography measurements. The essential features of the fabricated silicon nanoparticles are sizes smaller than 100 nm and crystalline phase presence. Effective fluorescence and light scattering of the laser-ablated silicon nanoparticles in the visible and near infrared ranges opens new prospects of their employment as contrasting agents in biophotonics, which was confirmed by pilot experiments on optical imaging.
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Anăstăsoaie, Veronica, Roxana Tomescu, Cristian Kusko, Iuliana Mihalache, Adrian Dinescu, Catalin Parvulescu, Gabriel Craciun, Stefan Caramizoiu, and Dana Cristea. "Influence of Random Plasmonic Metasurfaces on Fluorescence Enhancement." Materials 15, no. 4 (February 15, 2022): 1429. http://dx.doi.org/10.3390/ma15041429.

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One of the strategies employed to increase the sensitivity of the fluorescence-based biosensors is to deposit chromophores on plasmonic metasurfaces which are periodic arrays of resonating nano-antennas that allow the control of the electromagnetic field leading to fluorescence enhancement. While artificially engineered metasurfaces realized by micro/nano-fabrication techniques lead to a precise tailoring of the excitation field and resonant cavity properties, the technological overhead, small areas, and high manufacturing cost renders them unsuitable for mass production. A method to circumvent these challenges is to use random distribution of metallic nanoparticles sustaining plasmonic resonances, which present the properties required to significantly enhance the fluorescence. We investigate metasurfaces composed of random aggregates of metal nanoparticles deposited on a silicon and glass substrates. The finite difference time domain simulations of the interaction of the incident electromagnetic wave with the structures reveals a significant enhancement of the excitation field, which is due to the resonant plasmonic modes sustained by the nanoparticles aggregates. We experimentally investigated the role of these structures in the fluorescent behaviour of Rhodamine 6G dispersed in polymethylmethacrylate finding an enhancement that is 423-fold. This suggests that nanoparticle aggregates have the potential to constitute a suitable platform for low-cost, mass-produced fluorescent biosensors.
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Czene, Szabolcs, Nikoletta Jegenyes, Olga Krafcsik, Sándor Lenk, Zsolt Czigány, Gábor Bortel, Katalin Kamarás, János Rohonczy, David Beke, and Adam Gali. "Amino-Termination of Silicon Carbide Nanoparticles." Nanomaterials 13, no. 13 (June 27, 2023): 1953. http://dx.doi.org/10.3390/nano13131953.

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Silicon carbide nanoparticles (SiC NPs) are promising inorganic molecular-sized fluorescent biomarkers. It is imperative to develop methods to functionalize SiC NPs for certain biological applications. One possible route is to form amino groups on the surface, which can be readily used to attach target biomolecules. Here, we report direct amino-termination of aqueous SiC NPs. We demonstrate the applicability of the amino-terminated SiC NPs by attaching bovine serum albumin as a model for functionalization. We monitor the optical properties of the SiC NPs in this process and find that the fluorescence intensity is very sensitive to surface termination. Our finding may have implications for a few nanometers sized SiC NPs containing paramagnetic color centers with optically read electron spins.
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Богомолов, А. Б., С. А. Кулаков, П. В. Зинин, В. А. Кутвицкий, and М. Ф. Булатов. "Получение флуоресцентных композитных материалов на основе графитоподобного нитрида углерода." Журнал технической физики 129, no. 7 (2020): 910. http://dx.doi.org/10.21883/os.2020.07.49562.109-20.

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Highly fluorescent composite powder based on graphite-like carbon nitride (g-C3N4) was obtained by thermal decomposition of melamine in the presence of nanoparticles of aluminum oxide, titanium oxide and silicon oxide. The fluorescence properties of composite nanoparticles were studied with lazer having a wavelength of 532 nm. The relative quantum yield of the obtained material was 62%.
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Jiajia Wang, Jiajia Wang, Zhenhong Jia Zhenhong Jia, Changwu Lv Changwu Lv, and Yanyu Li Yanyu Li. "Application of metal nanoparticles/porous silicon diffraction grating in rhodamine 6 G fluorescence signal enhancement." Chinese Optics Letters 15, no. 11 (2017): 110501. http://dx.doi.org/10.3788/col201715.110501.

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Huang, Fenghua, Tao Huang, Xiangwei Wu, and Wenhui Pang. "Synthesis and characterization of ZnSe: Ag/SiO2 nanoparticles." E3S Web of Conferences 261 (2021): 02063. http://dx.doi.org/10.1051/e3sconf/202126102063.

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Argentum-doped zinc selenide/silicon dioxide nanoparticles (expressed as ZnSe: Ag/SiO2) were synthesized by Stöber method. The structure, morphology and fluorescence properties of the quantum dots were characterized by X-ray powder diffraction, transmission electron microscopy, infrared spectrum, ultraviolet-visible spectrum and fluorescence spectrum. The results show that the as-prepared ZnSe: Ag/SiO2 nanoparticles are spherical, most of which are about 30 nm in size, and have good fluorescence properties. Compared with that of ZnSe: Ag nanoparticles, the stability of ZnSe: Ag/SiO2 nanoparticles is enhanced obviously. The ZnSe: Ag/SiO2 nanoparticles will have potential applications in biological fluorescence analysis.
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Li, Zhen, Qiao Sun, Yian Zhu, Bien Tan, Zhi Ping Xu, and Shi Xue Dou. "Ultra-small fluorescent inorganic nanoparticles for bioimaging." J. Mater. Chem. B 2, no. 19 (2014): 2793–818. http://dx.doi.org/10.1039/c3tb21760d.

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The recent advances of ultra-small fluorescence inorganic nanoparticles including quantum dots, metal nanoclusters, carbon and graphene dots, up-conversion nanocrystals, and silicon nanoparticles have been comprehensively reviewed.
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Esthar, Selvaraj, Raman Dhivya, U. Ramesh, Jegathalaprathaban Rajesh, Thomas J. Webster, Jamespandi Annaraj, and Guruswamy Rajagopal. "Biocompatible, Biodegradable, and Improved Fluorescent Silicon Quantum Dots for Zebrafish Imaging." Journal of Biomedical Nanotechnology 18, no. 12 (December 1, 2022): 2740–49. http://dx.doi.org/10.1166/jbn.2022.3436.

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One of the greatest benefits of nanomedicine elucidated to date includes the non-invasive tracking and monitoring of living organisms by the selective uptake of harmless metallic nanoparticles. Several nanoscale probes have been employed for biomolecular imaging. Among them, fluorescent nanoscale silicon materials have been recently established with a strong and safe potential for bioimaging and biosensing applications due to their bright fluorescence coupled with strong photostability, biocompatibility and negligible toxicity. Herein, we developed high-quality silicon nanomaterials (4–5 nm; SiNPs) as biological fluorescent probes for bioimaging of living organisms through an easy aquatic synthesis method with a quantum yield of ∼8%. In this regard, we report that the presently synthesized SiNPs-based sensors/probes are attractive materials for solvent-based fluorescence measurements and are biocompatible, non-toxic, highly photo-stable and pH stable. Most importantly, their fluorescence lifetime is much longer than that of native probes in living cells. Thus, these presently formulated SiNPs are improved fluorescent probes for in vivo biological imaging in zebra fish embryos as well as numerous other living organisms and, thus, should be further studied.
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Starukhin, Aleksandr, Vladimir Apyari, Aleksander Gorski, Andrei Ramanenka, and Aleksei Furletov. "Plasmon enhancement of fluorescence of phthalocyanines metallocomplexes in solutions of silver nanoparticles." EPJ Web of Conferences 220 (2019): 03003. http://dx.doi.org/10.1051/epjconf/201922003003.

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A method of creation of aqueous solutions with silver nanoparticles for studying of fluorescence of hydrophobic compounds has been proposed for metallocomplexes of phthalocyanines. The effect of silver nanoparticles on the fluorescence of phthalocyanines metallocomplexes at room and low temperatures was studied. The addition of silver nanoparticles leads to plasmonic enhancement of signals in fluorescence and fluorescence excitation spectra of the compounds of interest from 1,5 to more than 7 times. The lifetimes and quantum yield of fluorescence were measured for solutions of metallophthalocyanines in binary mixtures and in binary mixtures with the addition of silver triangular nanoplates with shells of silicon dioxide.
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Liu, Chunyang, Xin Sui, Fang Yang, Xing Fu, Wei Ma, Jishun Li, and Yujun Xue. "Fluorescence of silicon nanoparticles prepared by nanosecond pulsed laser." AIP Advances 4, no. 3 (March 2014): 031332. http://dx.doi.org/10.1063/1.4868624.

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Dissertations / Theses on the topic "Fluorescence Silicon Nanoparticles"

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Shenoi, Perdoor Shridevi. "Nanoparticules fluorescentes cœur-coquille organique@silicates pour l'imagerie vasculaire in vivo." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAV063/document.

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Le but de cette thèse est la synthèse, l’optimisation et la fonctionnalisation de nanoparticules coeur-coquille organique@inorganique qui constituent une nouvelle classe de nanotraceurs pour l’imagerie profonde à deux photons de la vascularisation des tumeurs. Ces NPs cœur-coquille qui contiennent un cœur nanocristallin organique (ca 40-50 nm) enrobé d’une coquille de silice sont synthétisées en utilisant une méthode de séchage d’aérosol originale développée dans notre groupe. Le procédé est basé sur la nucléation et la croissance confinées d’un nanocristal organique ayant lieu simultanément avec la formation d’une croûte de silice par le séchage rapide de gouttelettes contenant des oligomères de silice un colorant organique et du solvant dans un flux d’air à 150-200 °C. Ce procédé en une étape est rendu possible grâce au contrôle à la fois de la chimie sol-gel (polycondensation) et du procédé de nanocristallisation qui ont lieu simultanément. Les précurseurs silicatés sont des alcoxydes de silicium : le TMOS (tetraméthoxysilane) et le TMSE (bis(triméthoxysilyl)éthane) choisis pour formés la coquille d’organosilice. De plus, l’organosilane AzPTES ((3-azidopropyl)triéthoxysilane) est utilisé pour inclure des fonctions azoture aux NPs pour une fonctionnalisation ultérieure avec des fragments organiques contenant des fragments alcyne par CuAAC (cycoaddition alcyne-azoture catalysée au cuivre). Les colorants organiques constituant le cœur organique sont non commerciaux et conçus pour fluorescer de façon très brillante à l’état solide sous excitation biphotonique dans le proche infra-rouge (fenêtre de transparence biologique). Ils ont en outre les propriétés physico-chimiques appropriées pour permettre leur nanocristallisation. Des NPs sphériques et sans défaut ont été obtenues, qui ont pu être mises en suspension colloïdale dans l’eau après dissolution basique partielle des coquilles puis neutralisation à pH physiologique.Afin de circuler de façon prolongée dans le flux sanguin pour permettre l’utilisation de ces NPs comme traceurs fluorescents, les NPs synthétisées ont été dérivatisées avec différentes fonctions pour augmenter leur stabilité colloïdale par des effets de charge ou stériques. L’influence de la fonctionnalisation a été étudiée en utilisant différentes techniques de caractérisation comme la spectroscopie de fluorescence, la diffusion dynamique de la lumière ou le potentiel zêta en conditions physiologiques. La fonctionnalisation par différents types de PEG (polyéthylène glycol) de différentes longueurs et modifiés par des fonctions alcyne a été effectuée. La spectroscopie infrarouge a permis de montrer le succès de la fonctionnalisation grâce à la diminution de l’intensité de la bande azoture et à l’apparition de vibrations CH. Les suspensions colloïdales de NPs fonctionnalisées par du PEG5000 ont été traitées dans l’eau ou dans du fluide biologique simulé, à 25 ou 37 °C. Dans tous les cas, la DLS a montré une bonne stabilité avec des diamètres moyens inférieurs à 200 nm dans tous les cas. La spectroscopie de fluorescence avant et après fonctionnalisation montre des brillances comparables ce qui suggère l’absence de blanchiment dans les conditions de fonctionnalisation. Les suspensions colloïdales une fois fonctionnalisées montrent une perte d’intensité de moins de 10% sur 8 h, ce qui suggère une stabilité colloïdale satisfaisante.L’interaction de ces NPs cœur-coquille avec différentes protéines sanguines a aussi été étudiée par DLS, et une très faible agrégation en présence de doses élevées de protéines a été montrée. Des tests d’imagerie par fluorescence à deux photons sur souris sont en cours
The aim of this work is the synthesis, optimization and functionalization of organic@inorganic core-shell nanoparticles (NPs), which constitute a novel class of nanoparticulate tracers, to be used for two-photon deep tissue imaging of tumor vascularization. These core-shell NPs, which comprise an organic dye nanocrystal core (ca 40-50 nm) surrounded by a silicate crust, are synthesized using an original spray-drying method developed in our group. This process is based on the confined nucleation and growth of an organic nanocrystal concomitantly with the formation of a silicate crust by fast drying of sprayed droplets containing silicate oligomers, organic dye and solvent under an air flux at 150-200 °C. This one-step synthesis is made possible thanks to the control of both the sol-gel chemistry (polycondensation) and the nanocrystallization process, which occur simultaneously. Alkoxide precursors, TMOS (tetramethoxysilane) and TMSE (1.2-bis(trimethoxysilyl)ethane) are chosen to form the silicate shell. Additionally, an organosilane, (3-azidopropyl) triethoxysilane (AzPTES), is used to impart an azide functionality to the NPs for further functionalization with alkyne-modified moieties using the Cu(I)-catalyzed 1,3-dipolar cycloaddition of organic azides to alkynes (CuAAC). The organic dyes for the nanocrystalline core are non-commercial and designed to exhibit high fluorescence intensity in the solid state under two-photon excitation in the near infrared (biological window) and the appropriate physico-chemical properties to enable their nanocrystallization. Spherical defect-free NPs were obtained. Colloidal NP suspensions were obtained after a basic partial dissolution of the shells of the NPs followed by acidic neutralization to pH 7.4, to match the pH of physiological media.In order to provide long circulation time of the NPs in the bloodstream to enable the use of these NPs as tracers for deep-tissue imaging, the synthesized NPs were derivatized with different moieties to improve their colloidal stability by charge/steric stabilization. The effects of the functionalization were studied using different characterization tools such as fluorescence spectroscopy, dynamic light scattering (DLS) and zeta potential under physiological conditions.Functionalization with different forms of alkyne-modified polyethylene glycol (PEG), differing in chain length and structure was done using CuAAC, to render them furtive and increase their circulation time in the bloodstream. The functionalized NPs, when compared with the initial core shell NPs (prior to functionalization) using IR spectroscopy, showed positive results, with reduction in the azide band intensity and appearance of bands corresponding to the C-H bonds of the PEG in the functionalized NPs. DLS performed on colloidal suspensions of the core-shell NPs functionalized with a long-chain (Mn :5000) PEG in two media, (a) water and (b) Simulated body fluid (SBF) solution, each tested at two different temperatures (i) 25 °C and (ii) 37 °C resulted in size distributions centered at less than 200 nm in all four cases, thereby indicating stability of the functionalized core-shell NP suspensions under physiological conditions. Fluorescence spectroscopy of the NP suspensions before and after functionalization also exhibited good results, with comparable brightness after functionalization, suggesting that no quenching occurred in the presence of Cu salts. The colloidal suspensions were found to have lost less than 10 % of the fluorescence signal, suggesting colloidal stability.The interactions of these core-shell NPs with different plasma proteins were also investigated, with minimal aggregation in the presence of high concentrations of proteins. Two-photon fluorescence imaging tests in mice are underway. In conclusion, bright, red-emitting core-shell NPs have been produced, which are promising for use in bio-imaging
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Turquet, François-Xavier. "Insertion of fluorescent manganese compounds – models of catalase – into mesoporous nanoparticles of silica, resol-silica and carbon-silica." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN086.

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Les ROS (Reactive Oxygen Species), tels H2O2, HO● et O2-●, sont produites naturellementpar le métabolisme des êtres vivants. Cependant, elles peuvent apparaître en trop grandesquantités dans le cas de certaines maladies (Alzheimer, Parkinson, scléroses, cancers). Lasurproduction de ROS conduit à une mortalité des cellules plus élevée.Certains micro-oragnismes possèdent une enzyme à base de Mn capable de catalyser laréaction de dismutation du H2O2 en O2 et H2O. Plusieurs molécules ont été synthétisées pourreproduire ce procédé, cependant très peu d'entre elle sont actives en environnement aqueux.Récemment, des espèces synthétiques du Mn ont été introduites dans des silicesvoient même leur activité catalytique augmenter. Afin de perséverer dans cette voie, cettethèse présente de nouveaux composés de MnII (dinucléaire et chaîne) et MnIII(tetranucléaire) basés sur ce concept. Ils sont dotés de ligands fluorescents, ajoutés pour desfin théragnostiques. Ces composés ont été insérés dans des nanoparticules (NPs) de silice ethybrides carbone-silice afin, de permettre leur vectorisation et d'étudier la compatibilité desNPs hybrides avec ce type de système.Le travail fourni explore les propriétés magnétiques des complexes, les propriétésluminescentes des composés et matériaux et montre la bonne insertion des composés dans lesNPs hybrides, ne nécessitant pas, contrairement aux NPs de silice pure, de fonctionnalisationsupplémentaire pour la rétention des complexes. Il met aussi en évidence l'activité descomposés du Mn dans l'acétonitrile et ouvre des pistes pour une optimisation des systèmeshybrides en milieu aqueux.Le travail fourni explore les propriétés magnétiques des complexes, les propriétésluminescentes des composés et matériaux et montre la bonne insertion des composés dans lesNPs hybrides, ne nécessitant pas, contrairement aux NPs de silice pure, de fonctionnalisationsupplémentaire pour la rétention des complexes. Il met aussi en évidence l'activité descomposés du Mn dans l'acétonitrile et ouvre des pistes pour une optimisation des systèmeshybrides en milieu aqueux
ROS (Reactive Oxygen Species), such as H2O2, HO● and O2-●, are naturally produced by themetabolism of living beings. However, they can appear in large quantities in the case of certaindiseases (Alzheimer's, Parkinson's, sclerosis, cancer). Overproduction of ROS leads to highercell mortality.Some microorganisms have an Mn-based enzyme capable of catalyzing the disproportionationreaction of H2O2 into O2 and H2O. Several molecules have been synthesized to reproduce thisprocess, however very few of them are active in aqueous environment. Recently, synthetic Mn species have been introduced into mesoporous silica to protect themfrom the environment. Thus, these complexes of Mn are stable and even see their catalyticactivity increase. In order to persevere in this way, this thesis presents new compounds ofMnII (dinuclear and chain) and MnIII (tetranuclear) based on this concept. They havefluorescent ligands (9-anthracene carboxylate), added for theragnostic purposes. Thesecompounds were inserted into silica nanoparticles (Nps), resol (a polyphenol resin) -silica andcarbon-silica hybrids in order to allow their vectorization and to study the compatibility ofhybrid NPs with this type of system.This work explores the magnetic properties of the complexes, the luminescent properties of thecompounds and materials and shows the good insertion of the compounds into the hybrid NPs,not requiring, in contrast to pure silica NPs, additional functionalization for the retention of thecomplexes. It also highlights the activity of Mn compounds in acetonitrile and paves the wayfor optimizing hybrid systems in aqueous media
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Hajjaji, Hamza. "Nanosondes fluorescentes pour l'exploration des pressions et des températures dans les films lubrifiants." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0076/document.

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L’objectif de ce travail est d’utiliser les nanoparticules (NPs) de nanosondes fluorescentes de température en particulier dans les films lubrifiants. Le développement de ces nanosondes nécessite la détermination de leurs sensibilités thermiques afin de pouvoir sélectionner les NPs les plus prometteuses. Pour atteindre cet objectif, nous avons présenté deux méthodes d’élaboration utilisées pour la synthèse des nanostructures à base de SiC-3C, la méthode d’anodisation électrochimique et la méthode d’attaque chimique. Dans le premier cas, les analyses FTIR,RAMAN et MET des NPs finales ont montré que la nature chimique de ces NPs est majoritairement formée de carbone graphitique. L’étude détaillée de la photoluminescence de ces NPs a montré que le processus d’émission dépend de la chimie de surface des NPs, du milieu de dispersion et de sa viscosité, de la concentration des suspensions et de la température du milieu. Pour la deuxième famille de NP de SiC, les analyses cohérentes MET, DLS et PL ont montrées une taille moyenne de 1.8 nm de diamètre avec une dispersion de ±0.5nm. Le rendement quantique externe de ces NPs est de l’ordre de 4%. Les NPs dispersées dans l’éthanol, n’ont pas montré une dépendance à la température exploitable pour notre application. Par contre, les NPs de SiC produites par cette voie, étant donné la distribution en taille resserrée et le rendement quantique « honorable » pour un matériau à gap indirect, sont prometteuses pour des applications comme luminophores en particulier pour la biologie grâce à la non toxicité du SiC. Dans le cas des NPs de Si, nous avons également étudié deux types différents de NPs. Il s’agit de : (i) NPs obtenues par anodisation électrochimique et fonctionnalisées par des groupements alkyls (décène, 1-octadécène). Nous avons mis en évidence pour la première fois une très importante variation de l’énergie d’émission dEg/dT avec la température de type red-shift entre 300 et 400K. Les mesures de(T) conduisent à une sensibilité thermique de 0.75%/°C tout à fait intéressante par rapport aux NPs II-VI. De plus il a été montré que la durée de vie mesurée n’est pas fonction de la concentration. (ii) NPs obtenue par voie humide et fonctionnalisées par le n-butyl. Pour ce type de NPs nous avons mis pour la première fois en évidence un comportement de type blue-shift pour dEg/dT de l’ordre de -0.75 meV/K dans le squalane. Pour ces NPs, la sensibilité thermique pour la durée de vie de 0.2%°C est inférieure à celle des NPs de type (i) mais largement supérieure à celle des NPs de CdSe de 4 nm (0.08%/°C). La quantification de cette la sensibilité à la température par la position du pic d’émission dEg/dT et de la durée de vie nous permet d’envisager la conception de nanosondes de température basée sur les NPs de Si avec comme recommandations l’utilisation de NPs obtenues par anodisation électrochimique et de la durée de vie comme indicateur des variations en température
The goal of this study is the use of Si and SiC nanoparticles (NPs) as fluorescent temperature nanoprobes particularly in lubricating films. The development of these nanoprobes requires the determination of their thermal sensitivity in order to select the best prospects NPs. To achieve this goal, we presented two preparation methods used for the synthesis of 3C-SiC based nanostructures : (i) anodic etching method and (ii) chemical etching method. In the first case, the FTIR, Raman and TEM analysis of final NPs showed that the chemical nature of these NPs is formed predominantly of graphitic carbon. The detailed photoluminescence study of these NPs showed that the emission process depends on the surface chemistry of the NPs, the dispersion medium and its viscosity, the suspension concentration and temperature of the environment.. In the second case, coherent TEM, DLS and PL analyzes showed an average size of 1.8 nm in diameter with a dispersion of ±0.5 nm. The external quantum efficiency of these NPs is 4%. NPs dispersed in ethanol, did not show an exploitable fluorescence dependence on temperature for our application. On the other hand, 3C-SiC NPs produced by this way, given the narrow size distribution and the reasonably high quantum yield for an indirect bandgap material, are promising for applications such as luminophores in particular in the biology field thanks to nontoxicity of SiC. In the case of Si we studied also two different types of NPs. (i) NPs obtained by anodic etching and functionalized by alkyl groups (decene, octadecene). We have demonstrated for the first time an important red-shift in the emission energy dEg/dT with temperature from 300 to 400K. The PL lifetime measurement(T) lead to a thermal sensitivity of 0.75% /°C very interesting compared to II-VI NPs. Furthermore it has been shown that t is not depending on the concentration. (ii) NPs obtained by wet-chemical process and functionalized with n-butyl. For this type of NPs we have identified for the first time a blue-shift behavior of dEg dT in the order of -0.75 meV/K in squalane. The thermal sensitivity for the PL lifetime of these NPs is 0.2%/°C, which is lower than that of NPs obtained by anodic etching method, but much greater than that of CdSe NPs with 4 nm of diameter (0.08%/°C). Quantification of the temperature sensitivity by the position of emission peak dEg/dT and the PL lifetime dτ/dT allows us to consider the realization of temperature nanoprobes based on Si NPs with recommendations to use Si NPs obtained by anodic etching method and PL lifetime as an indicator of temperature changes
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Chiu, Sheng-Kuei. "Photoluminescent Silicon Nanoparticles: Fluorescent Cellular Imaging Applications and Photoluminescence (PL) Behavior Study." PDXScholar, 2015. http://pdxscholar.library.pdx.edu/open_access_etds/2455.

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Molecular fluorophores and semiconductor quantum dots (QDs) have been used as cellular imaging agents for biomedical research, but each class has challenges associated with their use, including poor photostability or toxicity. Silicon is a semiconductor material that is inexpensive and relatively environmental benign in comparison to heavy metal-containing quantum dots. Thus, red-emitting silicon nanoparticles (Si NPs) are desirable to prepare for cellular imaging application to be used in place of more toxic QDs. However, Si NPs currently suffer poorly understood photoinstability, and furthermore, the origin of the PL remains under debate. This dissertation first describes the use of diatomaceous earth as a new precursor for the synthesis of photoluminescent Si NPs. Second, the stabilization of red PL from Si NPs in aqueous solution via micellar encapsulation is reported. Thirdly, red to blue PL conversion of decane-terminated Si NPs in alcohol dispersions is described and the origins (i.e., color centers) of the emission events were studied with a comprehensive characterization suite including FT-IR, UV-vis, photoluminescence excitation, and time-resolved photoluminescence spectroscopies in order to determine size or chemical changes underlying the PL color change. In this study, the red and blue PL was determined to result from intrinsic and surface states, respectively. Lastly, we determined that the blue emission band assigned to a surface state can be introduced by base addition in originally red-emitting silicon nanoparticles, and that red PL can be restored by subsequent acid addition. This experimentally demonstrates blue PL is surface state related and can overcome the intrinsic state related excitonic recombination pathway in red PL event. Based on all the data collected and analyzed, we present a simple energy level diagram detailing the multiple origins of Si NP PL, which are related to both size and surface chemistry.
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Kirla, Haritha. "Carbohydrate coated fluorescent Mesoporous Silica nanoparticles for Biomedical applications." Thesis, Kirla, Haritha (2019) Carbohydrate coated fluorescent Mesoporous Silica nanoparticles for Biomedical applications. Honours thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/51885/.

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The human body and many living organisms are comprised of very complex biological system with distinct metabolism. In order to understand life activities, we need to monitor the individual chemical interactions happening in vivo. Bioimaging with naked organic dye molecules always suffers from drawbacks such as photobleaching and biocompatibility issues. Silica matrix protects the fluorophores from external environment and provides hydrophilic shell, which improves the photostability and biocompatibility of dye molecules. A nanocarrier, which is highly compatible with the target metabolic system, may be beneficial for therapeutic and diagnostic applications in living organisms. Mesoporous silica nanoparticles (MSNs) are highly biocompatible and safe for biological applications and may provide the solution. Therefore, this project focused on the synthesis of dye-doped mesoporous silica nanoparticles, coupling them with various bioactive carbohydrate molecules, and investigation of these nanoparticles for their potential biological applications in microorganisms. Rhodamine B, fluorescein, and methylene blue dyes were employed for doping into amine modified mesoporous silica matrix through covalent and non-covalent approaches. The results revealed that all dyes were successfully doped into the silica matrix and showed bright fluorescence. In the next stage, methylene blue encapsulated amine grafted mesoporous silica nanoparticles (MB AMSNs) were utilized for coupling with carbohydrates- glucose, maltose, ribose, and raffinose by employing N, N'-carbonyldiimidazole as a coupling agent. The chemical and physical characterization showed the successful conjugation of carbohydrates onto amine-modified silica surface. Finally, glucose conjugated methylene blue doped mesoporous silica nanoparticles (Glu-MB MSN) were used in bioimaging and toxicity assessments. The as-synthesized nanoparticles were investigated in E.Coli and B.Subtilis bacterial samples. The characteristic results revealed bright fluorescence in bacteria like formations via confocal microscopy. Therefore, Glu-MB MSN may be useful for bioimaging purposes. SEM images showed bacterial aggregation after treatment with nanoparticles. This interaction is relatively higher in the case of B.Subtilis. Moreover, the bacterial cell structure appeared unaltered after incubation with the nanoparticles. This suggested that the nanoparticles were not toxic to these specific bacteria. However, more studies need to be performed to confirm these results.
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Goust, Victoire. "Fluorescent silica nanoparticles for multidimensional barcoding in droplets : towards high-throughput screening in two-phase microfluidics." Strasbourg, 2011. http://www.theses.fr/2011STRA6210.

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Le criblage à haut débit a connu des avancées significatives en 20 ans. Néanmoins, les technologies microplaque ou microarray ne sont pas toujours optimales. C’est pourquoi de nouvelles plates-formes, basées sur la microfluidique en gouttes, pourraient significativement augmenter le débit et réduire les coûts. Cependant, une fois en dehors de la puce, les gouttes perdent leur information spatiale : il est donc nécessaire de marquer les molécules encapsulées pour les identifier. Nous avons choisi un marquage fluorescent, car cette technique est très utilisée en biologie. Le but de ce travail était de fabriquer un matériau fluorescent compatible avec la microfluidique en gouttes, puis de produire plusieurs banques de gouttes encodées avec ce matériau. Nous avons opté pour des nanoparticules de silice comprenant un fluorophore organique attaché de manière covalente. Notre nouvelle synthèse a produit des particules de 2,5 nm, les plus petites jamais synthétisées. Elles sont plus brillantes que les fluorophores organiques, résistent mieux au photoblanchiment et ont une polarisation modulable. Nous avons ensuite étudié les propriétés de surface des particules, en particulier leur interaction avec le tensioactif. A temps longs, une compétition se produit. De plus, des effets osmotiques ont été mis en évidence, si la concentration en particules varie entre d’une goutte à l’autre. Enfin, nous avons examiné les paramètres majeurs dans l’élaboration du code, les optimisations possibles et des stratégies pour réduire le recouvrement spectral. Nous avons produit des banques de gouttes encodées avec deux et trois couleurs, qui peuvent être utilisées dans de nombreuses applications
High-throughput screening has seen significant advances in the last 20 years. However, microtiter plate or microarray technologies are not optimal for all types of assays. Hence, implementation of droplet-based microfluidic platforms could bring a breakthrough in terms of throughput and reduction of costs. However, once out of the chip, droplets lose positional information to identify drop contents. It is thus necessary to label the encapsulated compounds. Since fluorescence is a common assay readout method, we opted for this strategy. The goal of this PhD was to produce a fluorescent material compatible with the specificities of droplet microfluidics, then to generate several optically encoded droplet libraries with it. We opted for silica nanoparticles (SNPs) covalently encapsulating organic fluorophores. We developed a novel synthesis route that enabled us to reach sizes down to 2. 5 nm, the smallest ever synthesized. The SNPs are brighter than starting fluorophores, better resist photobleaching and have tunable fluorescence polarization. Then, we studied the surface properties of these particles, especially their interaction with the surfactant. At long time scales, competition between particles and surfactant was shown. In addition, dramatic osmotic effects were highlighted in case of unequal particle concentration across droplets. Last, we investigated crucial parameters in fluorescent code design, then generated two-and three-color encoded droplet libraries. We also discussed optimizations and on-the-fly identification. We finally identify many applications would benefit from this encoding system
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Turquet, François-Xavier. "Insertion of fluorescent manganese compounds - models of catalase - into mesoporous nanoparticles of silica, resol-silica and carbon-silica." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/666907.

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ROS (Reactive Oxygen Species), such as H2O2, HO● and O2-●, are naturally produced by the metabolism of living beings. However, they can appear in large quantities in the case of certain diseases (Alzheimer's, Parkinson's, sclerosis, cancer). Overproduction of ROS leads to higher cell mortality. Some microorganisms have an Mn-based enzyme capable of catalyzing the disproportionation reaction of H2O2 into O2 and H2O. Several molecules have been synthesized to reproduce this process, however very few of them are active in aqueous environment. Recently, polynuclear synthetic Mn species have been introduced into mesoporous silica to protect them from the environment. Thus, these complexes of Mn are stable and even see their catalytic activity increase. In order to persevere in this way, this thesis presents new compounds of formula [Mn(bpy)(AntCO2)2]n and [{Mn(bpy)(AntCO2)}2(µ-AntCO2)2(µ-OH2)] for MnII (chain and dinuclear respectively) and [Mn4O2(AntCO2)6(bpy)2(ClO4)2] for MnIII (tetranuclear) based on this concept. These compounds have two types of ligands, 2,2'-bipyridine, commonly found for similar compounds and 9-anthracene carboxylate, a fluorescent ligand added for theragnostic purposes. The resolution of the crystal structure of the MnII dinuclear compound shows a compression along the axis on the direction of the monodentate anthracene carboxylate. Moreover, by hydrolysis the one- dimensional system can be converted to the dinuclear compound. In the synthesis of the Mn(III) compound some oxidation of the anthracene is observed and two organic compounds are obtained, an anthraquinone and an ester formed by reaction between the quinone and the carboxylate. The manganese compounds were inserted into silica nanoparticles (NPs), resol (a polyphenol resin) -silica and carbon-silica hybrids in order to allow their vectorization and to study the compatibility of hybrid NPs with this type of system. This work explores the magnetic properties of the complexes and the luminescent properties of the coordination compounds and materials. The Mn(II) compounds show weak antiferromagnetic interaction, and the best way to differentiate these compounds is by EPR spectroscopy: the chain shows a unique band at g~2 while for the dinculear compound the spectrum is more complex, with several features at low fields. Magnetic properties of the Mn(III) compound confirms that it is a tetranuclear with butterfly type geometry with stronger antiferromagnetic interaction between the central ions than between central-terminal ions. The study of the porosity of the materials and the quantification of the presence of manganese inside the materials shows a good incorporation rate of the compounds. However it seems that the compounds are not present homogenously inside the support and that they are broken into smaller units. This is confirmed with the study of the magnetic properties of the hybrid [Mn]@NPs materials. In addition, fluoresecence measurement show that both the support and the compounds are luminescent but that both emission are strongly quenched when the compounds are inside the nanoparticles. The study of the optic properties of the materials show that a large amount of the compounds is released when the loaded silica and carbon-silica nanoparticles are redispersed in ethanol. However, resol-silica nanoparticles seem a lot more efficient to retain the complexes inside and apparently do not need further functionalization to achieve this goal. Finally, some preliminary test of disproportionation of H2O2 catalyzed by the manganese systems show low to moderate activity of Mn compounds in acetonitrile and paves the way for optimizing hybrid systems in aqueous media.
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Thakur, Dhananjay P. "Fluorescent and Magnetic Nanocomposites for Multimodal Imaging." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1274630209.

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Lemelle, Arnaud. "Development of new fluorescent silica and multifunctional nanoparticles for bio-imaging and diagnostics." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/7279.

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Silica nanoparticles are effective fluorophore carriers with high potential in imaging, diagnostics, and therapy. The particles are resistant to drastic change of environmental conditions (pH, temperature etc.) and insulate the dyes so as to protect them from photobleaching. Silica chemistry is also versatile and affords an easy modification of the particle composition and surface to integrate targeting ligands or to integrate other nanoparticles. Regardless of their advantages, there exists a lack of dye diversity in the literature that is connected to a low affinity for potential tools for biology and medicineThis thesis describes the development of an alternative method for the synthesis of fluorescent silica nanoparticles and their modification to incorporate iron oxide and gold. cont/d.
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Gagnon, Joanie. "Développement de nanosondes plasmoniques d'indium pour l'exaltation de la fluorescence dans l'UV." Master's thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25194.

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Jusqu’à tout récemment, la plupart des travaux effectués pour l’exaltation de la fluorescence moléculaire avaient comme substrat l’argent ou l’or sous forme de nanoparticules. Toutefois, ces deux métaux ne sont pas tout à fait adaptés pour l’exaltation de la fluorescence dans l’UV avec leur maximum plasmonique situé aux environs de 400 nm pour l’argent et aux environs de 530 nm pour l’or. L’intérêt de l’UV vient principalement de visées biomédicales considérant qu’une majorité de biomolécules absorbent et émettent dans cette région. Dans le cadre de ce projet, les biomolécules d’intérêt sont l’ADN qui fluorescence grâce aux bases azotées et les trois acides aminés aromatiques, le tryptophane, la tyrosine et la phénylalanine, qui sont quant à eux responsables de la fluorescence des protéines. Le but de ce projet est de développer un système nanoparticulaire permettant l’exaltation de la fluorescence dans l’UV. Le métal choisi est l’indium puisque ce dernier fait partie du groupe du bore (Al, Ga, In, Tl) et que ceux-ci sont caractérisés par de faibles pertes par absorption, mais également pour leur forte bande plasmonique vers 300 nm. L’indium possède donc toutes les qualités requises pour permettre l’exaltation de la fluorescence dans l’UV. Dans ce projet, des nanoparticules sphériques d’indium ont été développées avec une taille modulable entre 60 et 80 nm. Le plasmon de ces nanoparticules se situe vers 310 nm. Par la suite, ces mêmes cœurs d’indium ont été recouverts d’une couche diélectrique protectrice de silice. L’avantage d’une coquille de silice est la facilité avec laquelle l’épaisseur peut en être modifiée. La taille des coquilles synthétisées varie entre 5 et 50 nm. Une fois cette couche synthétisée, différentes avenues ont été envisagées pour le greffage des fluorophores en surface. Le choix final s’est arrêté sur l’incorporation des fluorophores à l’intérieur même d’une couche de silice. Les fluorophores sont préalablement modifiés pour faire en sorte qu’ils se lient de manière covalente à la silice. Le choix des fluorophores principaux s’est arrêté sur le Carbostyril 124, en tant que fluorophore modèle, et sur le tryptophane puisqu’il s’agit de l’acide aminé le plus fluorescent. Des facteurs d’exaltation de fluorescence de l’ordre de 3 et 7 ont respectivement été obtenus pour le Carbostyril 124 et le tryptophane. D’autres tests préliminaires ont également été menés sur les autres acides aminés, la tyrosine et la phénylalanine, ainsi que sur l’ADN.
Until recently, most of the work done on metal-enhanced fluorescence of molecular fluorophores employed silver and gold nanoparticles as the substrate. However, these metals are not perfectly suit for fluorescence enhancement in the UV region of the spectrum as their maximum plasmonic bands are centered at approximately 400 nm and 530 nm for silver and gold, respectively. The interest in the UV region is mostly due to biomedical studies as most of the biomolecules absorb and emit in this region. In this project, the focus is on DNA, which is fluorescent via the nucleobases, en even more so on proteins which owe their intrinsic fluorescence to the three aromatic amino acids, tryptophan, tyrosine and phenylalanine. The main goal of this project is to develop a nanostructure able to support metal-enhanced fluorescence in the UV. Indium seems to be the perfect metal to work with as it is part of the boron group (Al, Ga, In, Tl) which is characterized by low absorption losses, but also by its strong plasmonic band centered at approximately 300 nm making it suitable for metal-enhanced fluorescence studies in the UV. In this project, indium nanoparticles with a size ranging from 60 to 80 nm were developed with a plasmon approximately centered at 310 nm. Then, a protective dielectric layer of silica was synthesized on the indium core. The thickness of the silica layer is easily tunable; it is used to find the optimal distance to observe a maximal fluorescence enhancement. Silica shells between 5 and 50 nm were used. Different strategies were considered for the grafting of the fluorophores on the surface of indium-silica nanoparticles. Incorporation of the fluorophore into a silica layer was chosen as it allows for covalent bonding between the fluorophore and the silica layer. Two different fluorophores were used. The first one is Carbostyril 124, acting as a model fluorophore, and the second one is tryptophan as it is the most fluorescent amino acid. Enhancement factors of up to 3 and 7 were obtained for Carbostyril 124 and tryptophan, respectively. Others preliminary tests have been made on tyrosine and phenylalanine, the two other fluorescent amino acids, and on DNA.
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Books on the topic "Fluorescence Silicon Nanoparticles"

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Hilliard, Lisa R. Fluorescent dye-doped silica nanoparticles for bioanalysis. 2005.

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Book chapters on the topic "Fluorescence Silicon Nanoparticles"

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von Haeften, Klaus. "Fluorescent silicon clusters and nanoparticles." In Silicon Nanomaterials Sourcebook, 193–210. Boca Raton, FL: CRC Press, Taylor & Francis Group, [2017] | Series: Series in materials science and engineering: CRC Press, 2017. http://dx.doi.org/10.4324/9781315153544-10.

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Chen, Xiaokai, Xiaodong Zhang, and Fu-Gen Wu. "Silicon Nanoparticles for Cell Imaging." In Fluorescent Materials for Cell Imaging, 77–95. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5062-1_4.

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Liang, Song, Carrie L. John, Shuping Xu, Jiao Chen, Yuhui Jin, Quan Yuan, Weihong Tan, and Julia Xiaojun Zhao. "Silica-Based Nanoparticles: Design and Properties." In Advanced Fluorescence Reporters in Chemistry and Biology II, 229–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04701-5_7.

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Santra, Swadeshmukul. "Fluorescent Silica Nanoparticles for Cancer Imaging." In Methods in Molecular Biology, 151–62. Totowa, NJ: Humana Press, 2010. http://dx.doi.org/10.1007/978-1-60761-609-2_10.

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Bonacchi, Sara, Damiano Genovese, Riccardo Juris, Ettore Marzocchi, Marco Montalti, Luca Prodi, Enrico Rampazzo, and Nelsi Zaccheroni. "Energy Transfer in Silica Nanoparticles: An Essential Tool for the Amplification of the Fluorescence Signal." In Reviews in Fluorescence 2008, 119–37. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-1-4419-1260-2_5.

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Bradbury, Michelle S., Mohan Pauliah, and Ulrich Wiesner. "Ultrasmall Fluorescent Silica Nanoparticles as Intraoperative Imaging Tools for Cancer Diagnosis and Treatment." In Imaging and Visualization in The Modern Operating Room, 167–79. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2326-7_13.

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Chen, Sijie, Jacky W. Y. Lam, and Ben Zhong Tang. "Fabrication of Fluorescent Silica Nanoparticles with Aggregation-Induced Emission Luminogens for Cell Imaging." In Methods in Molecular Biology, 163–69. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-336-7_16.

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Weber, Achim, Marion Herz, and Günter E. M. Tovar. "Fluorescent Spherical Monodisperse Silica Core–Shell Nanoparticles with a Protein-Binding Biofunctional Shell." In Methods in Molecular Biology, 293–306. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-336-7_27.

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von, Klaus. "Fluorescent silicon clusters and nanoparticles." In Silicon Nanomaterials Sourcebook, 193–210. CRC Press, 2017. http://dx.doi.org/10.1201/9781315153544-11.

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Tharkur, Jeremy, Maria Alejandra Ricaurte, and Swadeshmukul Santra. "Fluorescent Silica Nanoparticles for Medical Imaging." In Frontiers in Nanobiomedical Research, 243–75. WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9789814520652_0042.

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Conference papers on the topic "Fluorescence Silicon Nanoparticles"

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von Haeften, K., A. Akraiam, G. Torricelli, A. Brewer, and Elisabetta Borsella. "Fluorescence of silicon nanoparticles suspended in water: reactive co-deposition for the control of surface properties of clusters." In BONSAI PROJECT SYMPOSIUM: BREAKTHROUGHS IN NANOPARTICLES FOR BIO-IMAGING. AIP, 2010. http://dx.doi.org/10.1063/1.3505080.

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Hazzazi, Fawwaz, Alex Young, and Theda Daniels-Race. "Fluorescence spectroscopy characterization of electrophoretically deposited ZnO nanoparticles on aluminum, silicon, and APTES functionalized silicon substrates." In Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, edited by Daniele Zonta, Zhongqing Su, and Branko Glisic. SPIE, 2022. http://dx.doi.org/10.1117/12.2630785.

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So, Woong Young, Qi Li, Rongchao Jin, and Linda A. Peteanu. "Mechanism of fluorescent silicon nanoparticles." In Physical Chemistry of Semiconductor Materials and Interfaces XVI, edited by Hugo A. Bronstein and Felix Deschler. SPIE, 2017. http://dx.doi.org/10.1117/12.2273432.

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Montalti, Marco, Luca Prodi, Nelsi Zaccheroni, Gionata Battistini, Fabrizio Mancin, and Enrico Rampazzo. "Fluorescent silica nanoparticles." In Biomedical Optics 2006, edited by Tuan Vo-Dinh, Joseph R. Lakowicz, and Zygmunt Gryczynski. SPIE, 2006. http://dx.doi.org/10.1117/12.646027.

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Li, Peng, Hong Chen, Constantine Anagnostopoulos, and Mohammad Faghri. "Fluorescence Amplification Using Biospecific Nanoparticle Conjugates as Labels in Microfluidic Heterogeneous Immunoassays." In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13234.

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In microfluidic sensing systems, it is challenging to achieve desirable sensitivity for detecting reduced number of analytes in a small volume (pL–nL). Many efforts have been made in order to improve the sensitivity of microfluidic fluorescence detection systems. Some prevalent methods (e.g., optical components integration and analyte enrichment) either increase cost or require extra operational steps. Fluorescence amplification using dye-doped silica nanoparticles has proved to be an inexpensive and efficient approach; however, this technique is still far from perfect. For instance, dye molecules physically entrapped in the silica nanoparticles occasionally leak and can cause false-negative results. In addition, the nonspecific adsorption of nanoparticles has not been resolved.
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Ahmad, Atiqah, Nor Dyana Zakaria, and Khairunisak Abdul Razak. "Photostability effect of silica nanoparticles encapsulated fluorescence dye." In ADVANCED MATERIALS FOR SUSTAINABILITY AND GROWTH: Proceedings of the 3rd Advanced Materials Conference 2016 (3rd AMC 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.5010447.

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Patonay, Gabor, Gala Chapman, Maged M. Henary, and Walid Abdelwahab. "Fluorescent multidye copolymerized silica nanoparticles for bioanalytical applications (Conference Presentation)." In Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications X, edited by Samuel Achilefu and Ramesh Raghavachari. SPIE, 2018. http://dx.doi.org/10.1117/12.2294916.

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Patonay, Gabor, Maged Henary, Gala Chapman, and Walid Abdelwahab. "Surface modified fluorescent silica nanoparticles and their applications (Conference Presentation)." In Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications XI, edited by Samuel Achilefu and Ramesh Raghavachari. SPIE, 2019. http://dx.doi.org/10.1117/12.2513443.

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Ng, S. H., C. M. Zettner, C. Zhou, I. H. Yoon, S. Danyluk, M. Sacks, and M. Yoda. "Nanoparticulate and Interfacial Mechanics in Confined Geometries Typical of Chemical-Mechanical Planarization." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41964.

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Chemical-mechanical planarization (CMP), a surface preparation process used widely in integrated circuits manufacture, is currently the leading nanoscale manufacturing process worldwide, with an annual economic impact well in excess of $1 billion. Originally developed for glass polishing, CMP is used by the microelectronics industry to create silicon, silicon oxide, tungsten and copper surfaces with average roughnesses of O(10 mm). The process typically involves shearing a dilute abrasive silica or ceria nanoparticle-laden “slurry” between a compliant rough surface (the “pad”) and the surface to be polished (the “wafer”). The composition of the slurry can greatly affect material removal rates. Despite its importance, however, a lot still remains to be discovered about the fundamental mechanisms involved in this process. A multidisciplinary effort at Georgia Tech has focused upon the interfacial mechanics of this process and how nanoparticles chemomechanically wear SiO2, Si and Cu surfaces. It has been found, for example, that the wear rate of dielectric varies approximately as the particle diameter. The entrapment of particles at the asperity/dielectric interface is thought to produce the polishing, but the exact nature of this interaction is still unknown. An evanescent-wave visualization technique has therefore been developed to visualize the dynamics of fluorescent 300–500 nm diameter colloidal silica and polystyrene particles within a particle diameter of the “wafer” surface in a simplified model pad-wafer geometry. The technique has been used for the first time to the authors’ knowledge to directly measure the velocity and concentration of the interfacial particles—which presumably interact with and wear the wafer. Although the pad speeds in these studies are much lower than those encountered in the actual CMP process, the initial results suggest that there is negligible “slip” between the particle and fluid phase velocities at the wafer surface. The number of particles at the wafer surface appears, however, to be strongly affected by particle properties, including particle density and size.
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O'Connell, Claire, Robert I. Nooney, MacDara Glynn, Jens Ducree, and Colette McDonagh. "Fluorescent Cy5 silica nanoparticles for cancer cell imaging." In SPIE Nanoscience + Engineering, edited by Hooman Mohseni, Massoud H. Agahi, and Manijeh Razeghi. SPIE, 2015. http://dx.doi.org/10.1117/12.2186167.

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Reports on the topic "Fluorescence Silicon Nanoparticles"

1

Chiu, Sheng-Kuei. Photoluminescent Silicon Nanoparticles: Fluorescent Cellular Imaging Applications and Photoluminescence (PL) Behavior Study. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2453.

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