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Journal articles on the topic 'Fluorescence Silicon Nanoparticles'

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Author: Grafiati

Published: 7 September 2023

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1

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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2

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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3

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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4

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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6

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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7

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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8

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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9

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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Zhuo, Shujuan, Mingwang Shao, Liang Cheng, Ronghui Que, Dorthy Duo Duo Ma, and Shuit Tong Lee. "Surface-enhanced fluorescence from copper nanoparticles on silicon nanowires." Frontiers of Optoelectronics in China 4, no. 1 (March 2011): 114–20. http://dx.doi.org/10.1007/s12200-011-0152-y.

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12

Wang, Hai-Yan, Pei-Pei Cao, Zheng-Ying He, Xi-Wen He, Wen-You Li, Yu-Hao Li, and Yu-Kui Zhang. "Targeted imaging and targeted therapy of breast cancer cells via fluorescent double template-imprinted polymer coated silicon nanoparticles by an epitope approach." Nanoscale 11, no. 36 (2019): 17018–30. http://dx.doi.org/10.1039/c9nr04655k.

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13

Zhong, Yiling, Bin Song, Xiaobin Shen, Daoxia Guo, and Yao He. "Fluorescein sodium ligand-modified silicon nanoparticles produce ultrahigh fluorescence with robust pH- and photo-stability." Chemical Communications 55, no. 3 (2019): 365–68. http://dx.doi.org/10.1039/c8cc07340f.

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Li, Si, Feng Wang, Xi-Wen He, Wen-You Li, and Yu-Kui Zhang. "One-pot hydrothermal preparation of gadolinium-doped silicon nanoparticles as a dual-modal probe for multicolor fluorescence and magnetic resonance imaging." Journal of Materials Chemistry B 6, no. 20 (2018): 3358–65. http://dx.doi.org/10.1039/c8tb00415c.

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15

Li, Sha, Yaping Yuan, Yuqi Yang, Conggang Li, Michael T. McMahon, Maili Liu, Shizhen Chen, and Xin Zhou. "Potential detection of cancer with fluorinated silicon nanoparticles in 19F MR and fluorescence imaging." Journal of Materials Chemistry B 6, no. 26 (2018): 4293–300. http://dx.doi.org/10.1039/c8tb00648b.

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16

Zhang, Jing Bo, L. Cheng, L. Y. L. Yung, S. S. Chua, J. Y. Sze, Shao Li Zhu, T. C. Ayi, and R. Jeevaneswaran. "Metallic Nanoparticles and Nanostructures for Bio-Applications." Advanced Materials Research 74 (June 2009): 119–23. http://dx.doi.org/10.4028/www.scientific.net/amr.74.119.

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This paper elaborates on approaches of synthesis of Au and Ag nanoparticles (NPs), deposition of colloid onto glass substrate and encapsulation of NPs with silicon dioxide (SiO2) thin shell. As one important bio application of metallic nanoparticles, both solution-based and substrate-based fluorescence enhancement tests are demonstrated.

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Sharonova, Nina V., Anatoly A. Ischenko, Elena Yu Yagudaeva, Svetlana V. Sizova, Evgeniya V. Smirnova, Anna Yu Ermakova, Alexander P. Sviridov, and Vitaly P. Zubov. "MODIFICATION OF NANOCRYSTALLINE SILICON BY POLYMERS FOR BIOMEDICAL APPLICATIONS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 9 (August 31, 2019): 86–96. http://dx.doi.org/10.6060/ivkkt.20196209.5929.

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In this paper, it is proposed to use polymer-modified composite materials based on nanocrystalline silicon (nc-Si) as an alternative to organic fluorescent quantum dots traditionally used in medicine. A distinctive feature of nc-Si is a high absorption coefficient in the near UV and blue-violet range and the ability to transmit light in the visible region of the spectrum. The main advantage of silicon-based nanoparticles for in vivo use is their biodegradability and the absence of toxic properties. For hydrophilization of silicon nanoparticles, their surface was modified by amphiphilic biocompatible polymers: polyvinylpyrrolidone, a copolymer of maleic anhydride and 1-octadecene, cremophore, which is a polyoxyethylene derivative of hydrogenated castor oil. Silicon nanoparticles (nc-Si) with an average diameter of 4.5 nm, synthesized by annealing of SiO at 1150 °C, and functionalized with 1-octadecene photoluminescent in the red-infrared spectral region were used. The presence of the polymer shell on the surface of the nanoparticles was confirmed by FTIR spectroscopy. The sedimentation and aggregative stability of the particles in water were analyzed. It is shown that after the nc-Si polymer modification, the photoluminescent properties of nanoparticles are retained although the photoluminesce maxima were shifted to the blue region. Colorimetric MTT-assay of the cytotoxicity of the nanoparticles modified with polymers to monoclonal cells of human erythroleukemia K562 showed no toxicity for cells in culture at a particle concentration of up to 50 μg/ml. Subcellular localization of silicon nanoparticles into the human cervical carcinoma cell line HeLa was shown by means of fluorescence microscopy. The obtained polymer-modified nc-Si particles can be recommended for the purposes of bioimaging in in vitro and in vivo applications.

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SHING, CHRISTOPHER, LIQIAO QIN, and SHALYA SAWYER. "BIO-SENSING SENSITIVITY OF A NANOPARTICLE BASED ULTRAVIOLET PHOTODETECTOR." International Journal of High Speed Electronics and Systems 20, no. 03 (September 2011): 505–13. http://dx.doi.org/10.1142/s0129156411006799.

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Bio-sensing sensitivity of a spectrally selective nanoparticle based ultraviolet (UV) photodetector is characterized in comparison to a silicon photodiode and a photomultiplier tube (PMT). The nanoparticle based photodetector is comprised of poly-vinyl alcohol (PVA) coated zinc-oxide ( ZnO ) nanoparticles deposited on an aluminum-gallium-nitride ( AlGaN ) epitaxially grown substrate. The sensitivity was determined by measuring the fluorescence intensity of the native fluorophore, tryptophan, in Escherichia coli (E-coli, ATCC-25922) cells. Tryptophan intrinsically fluoresces with a peak at 340 nm under 280 nm UV light illumination. It is shown that this detector can sense the concentration of E-coli to 2.5 × 108 cfu/mL while the silicon photodiode cannot detect the intrinsic fluorescence at all. Nevertheless, the PMT outperformed the ZnO nanoparticle- AlGaN substrate based photodetector with the ability to sense E-coli concentrations to 3.91 × 106 cfu/mL. However, because PMT based systems are commonly limited by high dark current, susceptible to environmental changes, sensitive to ambient light, are not spectrally selective and have high power consumption, biological detection systems comprised of these ZnO nanoparticle- AlGaN substrate based photodetectors can be more effective for near real time characterization of potential bacterial contamination.

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Minin, Artem, Ilya Byzov, Mikhail Uimin, Anatoly Ye Ermakov, Nina Shchegoleva, Sergey Zhakov, Leonid Smoluk, Maria Ulitko, and Artem Minin. "Bimodal Fluorescent and Magnetic Nanoparticles Based on Carbon Quantum Dots and Metal-Carbon Nanocomposites for Bio-Applications." Key Engineering Materials 683 (February 2016): 454–61. http://dx.doi.org/10.4028/www.scientific.net/kem.683.454.

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The simultaneous combination of optical and magnetic properties of nanoparticles would greatly benefit in vivo disease diagnosis as well as in situ monitoring of cell in cell culture. The most promising application of magnetic particles in biomedicine is MRI contrast enhancement and magnetic hyperthermia. Another important thing is the determination of exact localization of nanoparticles in the cell culture that can be defined by e.g. optical way. In our investigation we used the iron nanoparticles encapsulated in carbon as a magnetic component and carbon quantum dots as an optical labels to provide the photostability and fluorescence in a wide range of wavelengths. In order to avoid the fluorescence quenching in bimodal particles the optical and magnetic components should be separated by insulator layer. To create the optimal bimodal nanoparticles for this purpose the non-typical configuration of nanocomposites was realized, namely, a fluorescent core was separated from the coated magnetic particles by silicon dioxide matrix. Finally, it was shown that these bimodal nanocomposites demonstrate the high magnetic properties, good visualized ability and low toxicity for living cells as well.

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Luo, Kuan, and Xinyu Jiang. "Detection of Glucose in Human Serum Based on Silicon Dot Probe." Current Analytical Chemistry 16, no. 6 (August 13, 2020): 744–52. http://dx.doi.org/10.2174/1573411015666190702152331.

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Background: Diabetes Mellitus (DM) is a major public metabolic disease that influences 366 million people in the world in 2011, and this number is predicted to rise to 552 million in 2030. DM is clinically diagnosed by a fasting blood glucose that is equal or greater than 7 mM. Therefore, the development of effective glucose biosensor has attracted extensive attention worldwide. Fluorescence- based strategies have sparked tremendous interest due to their rapid response, facile operation, and excellent sensitivity. Many fluorescent compounds have been employed for precise analysis of glucose, including quantum dots, noble metal nanoclusters, up-converting nanoparticles, organic dyes, and composite fluorescent microspheres. Silicon dot as promising quantum dots materials have received extensive attention, owing to their distinct advantages such as biocompatibility, low toxicity and high photostability. Methods: MnO2 nanosheets on the Si nanoparticles (NPs) surface serve as a quencher. Si NPs fluorescence can make a recovery by the addition of H2O2, which can reduce MnO2 to Mn2+, and the glucose can thus be monitored based on the enzymatic conversion of glucose by glucose oxidase to generate H2O2. Therefore, the glucose concentration can be derived by recording the fluorescence recovery spectra of the Si NPs. Results: This probe enabled selective detection of glucose with a linear range of 1-100 μg/mL and a limit of detection of 0.98 μg/mL. Compared with the commercial glucometer, this method showed favorable results and convincing reliability. Conclusion: We have developed a novel method based on MnO2 -nanosheet-modified Si NPs for rapid monitoring of blood glucose levels. By combining the highly sensitive H2O2/MnO2 reaction with the excellent photostability of Si NPs, a highly sensitive, selective, and cost-efficient sensing approach for glucose detection has been designed and applied to monitor glucose levels in human serum with satisfactory results.

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Kanathasan, Jayasree S., Varghese Swamy, Uma Devi Palanisamy, and Ammu Kutty G. K. Radhakrishnan. "Legumain Targeting Peptide Conjugated Fluorescent Porous Silicon Nanoparticles for Breast Cancer Imaging." Advances in Science and Technology 102 (October 2016): 45–50. http://dx.doi.org/10.4028/www.scientific.net/ast.102.45.

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Porous silicon (PSi) with a suite of most desirable biomaterial properties has attracted great attention as a multifunctional nanoplatform for bioimaging and drug delivery. Various surface functionalization treatments have been reported for PSi to use as an active tumor cell targeting nanovector. In this study, we investigated surface functionalization treatments using a peptide that is specific to the emerging biomarker legumain. The PSi nanoparticles were coated with dextran and subsequently two types of legumain targeting peptide, Y-shaped and linear chain, were conjugated to produce the functionalized PSi. The functionalized (ligand-conjugated) PSi materials were characterized for morphology, size, functional groups, and fluorescence response using electron and fluorescence microscopy and vibrational spectroscopy techniques. Fluorescence microscopy imaging with two excitation wavelengths (450 nm and 600 nm) suggests comparable fluorescence response of the conjugated PSi to “bare” PSi and the suitability of the PSi functionalized with peptide for bioimaging.

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Li, Xinran, Hong Ma, Min Deng, Anam Iqbal, Xiaoyu Liu, Bo Li, Weisheng Liu, Jiping Li, and Wenwu Qin. "Europium functionalized ratiometric fluorescent transducer silicon nanoparticles based on FRET for the highly sensitive detection of tetracycline." Journal of Materials Chemistry C 5, no. 8 (2017): 2149–52. http://dx.doi.org/10.1039/c7tc00305f.

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Zhang, Min, Junwen Wang, and Qiang Cheng. "Effect of Porous Silicon Nanoparticle Drug-Loading System on Ulcerative Colitis." Journal of Nanoscience and Nanotechnology 21, no. 2 (February 1, 2021): 1118–26. http://dx.doi.org/10.1166/jnn.2021.18699.

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Ulcerative colitis (UC) is a non-specific intestinal inflammatory disease. UC occurred in developed countries in the past, but in the past 20 years, the incidence of UC in developing countries has also shown a clear upward trend. The hospitalization rate and surgical rate of UC have been high, and may lead to the occurrence of intestinal malignant tumors, which has greatly affected the quality of life and life expectancy of patients. Because of this, how to effectively treat UC has become a hotspot in modern gastrointestinal diseases. Due to the limitation of the dosage form of the drug and the special environment of the gastrointestinal tract, traditional oral drugs have the disadvantage of not being able to make the drug effective in specific lesions when treating inflammatory bowel disease. Therefore, it is of great scientific significance and application value to develop drug carriers that can target the inflammatory sites and slow-release drugs to treat inflammation. In this study, TNBS method was used to prepare a rat model of ulcerative colitis, and the effect of modified porous silicon nanoparticles as a drug carrier in the treatment of UC was investigated. We first induced acute enteritis model in C57BL/6 rats through TNBS, and then used in vivo fluorescence imaging and immunofluorescence staining technology to prove that porous silicon nanoparticles can indeed be specifically concentrated in the damaged part of the mouse intestine, and then administered by gastric administration. The drug method allows rats to take different types and concentrations of drug-loaded porous silicon nanoparticles, and finally collect relevant samples for evaluation of drug efficacy after the end of the administration cycle. The disease activity index showed the best gastrointestinal recovery in mice treated with modified drug-loaded porous silicon nanoparticles. The pathological analysis of rat colons using HE staining proved that the improved drug-loaded porous silicon nanoparticles had a more significant therapeutic effect. TUNEL staining results showed that the level of apoptosis in the colon injury site of rats treated with modified drug-loaded porous silicon nanoparticles was reduced. The test results of drug concentration in rat colon tissue blood also proved that porous silicon nanoparticle drug-loading system can reduce the release of inflammatory factors in vivo. Based on the TNBS-induced UC rat model, this paper evaluates the therapeutic effect of modified drug-loaded porous silicon nanoparticles. The results show that in the treatment of ulcerative colitis, the nanoparticle drug-loaded system is a more effective treatment way.

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Butusov, Leonid A., Galina K. Chudinova, Margarita V. Kochneva, Vladimir V. Kurilkin, Tatyana F. Sheshko, Alexandra Shulga, Indira A. Hayrullina, and Oleg S. Kudryavtsev. "Fluorescence Properties of Tb-Doped ZnO Porous Network Thin Film Grown on Monocrystalline Silicon Substrate." Materials Science Forum 934 (October 2018): 3–7. http://dx.doi.org/10.4028/www.scientific.net/msf.934.3.

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This research presents a new perspective on optical biosensors based on zinc oxide nanoparticles. The widely known and successfully applied nanostructured material is modified by the dopant - the green phosphor Terbium, which embedded in the structure of zinc oxide and makes a significant contribution to the fluorescent response of the material in both the UV and visible spectral regions. The effect of various dopant concentrations on the fluorescence of nanostructures was studied; the nanostructures were examined by SEM.

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Kim, Hajin, and Honglae Sohn. "Oxidized Porous Silicon Nanoparticles Covalent-Bonded with Levofloxacin in Hydrogel Polymer as a Drug Delivery System." Journal of Nanoscience and Nanotechnology 20, no. 8 (August 1, 2020): 4619–23. http://dx.doi.org/10.1166/jnn.2020.17843.

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Oxidized porous silicon (OPS) nanoparticles covalent-bonded with levofloxacin in hydrogel polymer are prepared and used to measure the efficiency for the controlled release drug delivery. Levofloxacin is covalently bonded to a Si–OH surface of OPS nanoparticles by catalytic condensation. The average size of these particles is about 100 nm. Since levofloxacin has a fluorescence property, the release of levofloxacin has been measured by fluorescence spectrometer. The quantity of levofloxacin release from the OPS nanoparticles is measured at the emission wavelength at 455 nm with an excitation wavelength of 330 nm on a time scale in pH 7 aqueous buffer solution. The analysis of release profile reveals that the OPS covalently bonded with levofloxacin (Levo-OPS) exhibits a great potential candidate for controlled release. The drug-release rate depends on the hydrolysis of silyl ester from the surface of OPS nanoparticles.

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Chen, Lei, Peilin Yu, Manling Lu, Jun Liu, and Hualin Chen. ""All-inclusive" silicon nanoparticles for sensitive detection of blood glucose." Materials Express 10, no. 9 (September 30, 2020): 1498–503. http://dx.doi.org/10.1166/mex.2020.1768.

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In this study, a success is achieved in developing a new variety of "all-inclusive" silicon nanoparticles with recognition components of boronic acid groups and anti-fouling components of PEG segments for the precise detection of glucose. The added glucose will contribute to the significant fluorescence quenching of "all-inclusive" silicon nanoprobes. Not only does this method achieve the accurate detection of glucose in the range of 0.4 to 10 μM with a detection limit of 0.27 μM, it is also applicable to the clinical analysis of blood glucose.

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Wu, Yanyan, Yiling Zhong, Binbin Chu, Bin Sun, Bin Song, Sicong Wu, Yuanyuan Su, and Yao He. "Plant-derived fluorescent silicon nanoparticles featuring excitation wavelength-dependent fluorescence spectra for anti-counterfeiting applications." Chemical Communications 52, no. 43 (2016): 7047–50. http://dx.doi.org/10.1039/c6cc02872a.

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Adinarayana, T. V. S., Ayushi Mishra, Ishu Singhal, and D. V. Rama Koti Reddy. "Facile green synthesis of silicon nanoparticles from Equisetum arvense for fluorescence based detection of Fe(iii) ions." Nanoscale Advances 2, no. 9 (2020): 4125–32. http://dx.doi.org/10.1039/d0na00307g.

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Kargina, Yu V., A. D. Mironova, A. Yu Kharin, A. M. Perepukhov, A. A. Ischenko, and V. Yu Timoshenko. "Proton magnetization relaxation in aqueous suspensions of composite silicon-iron nanoparticles for biomedical applications." Journal of Physics: Conference Series 2058, no. 1 (October 1, 2021): 012016. http://dx.doi.org/10.1088/1742-6596/2058/1/012016.

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Abstract Silicon-iron composite nanoparticles produced by arc-discharge plasma ablation method were characterized by scanning electron microscopy, dynamic light scattering, X-ray fluorescence diffractometry, and the effect of iron content and size of the nanoparticles on hydrogen nuclei magnetization relaxation were investigated by nuclear magnetic resonance relaxometry. It was shown that increasing in iron content during the synthesis leads to distortion of the spherical shape of the nanoparticles and increasing of their mean sizes from 140 nm to 350 nm. Nonlinear dependence of the longitudinal and transverse relaxivities from iron content was demonstrated. Increase in the iron concentration above 2.5 at. % leads to reduction of the both relaxivities, which can be explained by nonuniform distribution of iron and formation of iron containing agglomerates. It was shown that transverse and longitudinal relaxivities of the nanoparticles in their aqueous solutions inversely proportional from their hydrodynamic diameters in the range of 100 – 300 nm. The possibilities of using composite silicon-iron nanoparticles for biomedical applications are discussed.

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Shen, Xiao-Bin, Bin Song, Bei Fang, Ai-Rui Jiang, Shun-Jun Ji, and Yao He. "Excitation-wavelength-dependent photoluminescence of silicon nanoparticles enabled by adjustment of surface ligands." Chemical Communications 54, no. 39 (2018): 4947–50. http://dx.doi.org/10.1039/c8cc00047f.

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Han, Yangxia, Wenjuan Lv, Hongli Chen, Hui Li, Jia Chen, Zhan Li, and Hongdeng Qiu. "Chiral Fluorescent Silicon Nanoparticles for Aminopropanol Enantiomer: Fluorescence Discrimination and Mechanism Identification." Analytical Chemistry 92, no. 5 (February 14, 2020): 3949–57. http://dx.doi.org/10.1021/acs.analchem.9b05442.

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Cui, Kaiqing, Yi Chang, Peng Liu, Lin Yang, Tingting Liu, Zhi Zheng, Yuming Guo, and Xiaoming Ma. "Cell-Tailored Silicon Nanoparticles with Ultrahigh Fluorescence and Photostability for Cellular Imaging." ACS Sustainable Chemistry & Engineering 8, no. 47 (November 16, 2020): 17439–46. http://dx.doi.org/10.1021/acssuschemeng.0c05845.

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Sato, Keisuke, Shinobu Yokosuka, Yasunori Takigami, Kenji Hirakuri, Kouki Fujioka, Yoshinobu Manome, Hiroaki Sukegawa, Hideo Iwai, and Naoki Fukata. "Size-Tunable Silicon/Iron Oxide Hybrid Nanoparticles with Fluorescence, Superparamagnetism, and Biocompatibility." Journal of the American Chemical Society 133, no. 46 (November 23, 2011): 18626–33. http://dx.doi.org/10.1021/ja202466m.

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Yang, Wenzhao, Prateek K. Srivastava, Shanshan Han, Lili Jing, Chang-Ching Tu, and Sung-Liang Chen. "Optomechanical Time-Gated Fluorescence Imaging Using Long-Lived Silicon Quantum Dot Nanoparticles." Analytical Chemistry 91, no. 9 (April 15, 2019): 5499–503. http://dx.doi.org/10.1021/acs.analchem.9b00517.

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35

Ye, Hongli, Lukai Zhao, Xinghui Ren, Youqiong Cai, and Hai Chi. "“Switch-Off-On” Detection of Fe3+ and F− Ions Based on Fluorescence Silicon Nanoparticles and Their Application to Food Samples." Nanomaterials 12, no. 2 (January 10, 2022): 213. http://dx.doi.org/10.3390/nano12020213.

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An approach to the detection of F− ions in food samples was developed based on a “switch-off-on” fluorescence probe of silicon nanoparticles (SiNPs). The fluorescence of the synthetic SiNPs was gradually quenched in the presence of Fe3+ ion and slightly recovered with the addition of F− ion owing to the formation of a stable and colorless ferric fluoride. The fluorescence recovery exhibited a good linear relationship (R2 = 0.9992) as the concentration of F− ion increased from 0 to 100 μmol·L−1. The detection limit of the established method of F− ion was 0.05 μmol·L−1. The recovery experiments confirmed the accuracy and reliability of the proposed method. The ultraviolet–visible spectra, fluorescence decays, and zeta potentials evidenced the fluorescence quenching mechanism involving the electron transfer between the SiNPs and Fe3+ ion, while the fluorescence recovery resulted from the formation of ferric fluoride. Finally, SiNPs were successfully applied to detect F− ions in tap water, Antarctic krill, and Antarctic krill powder.

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Yan, Chun-Na, Lin Xu, Qing-Di Liu, Wei Zhang, Rui Jia, Cheng-Zhi Liu, Shuang-Shuang Wang, Li-Ping Wang, and Guang Li. "Surface-Induced ARGET ATRP for Silicon Nanoparticles with Fluorescent Polymer Brushes." Polymers 11, no. 7 (July 23, 2019): 1228. http://dx.doi.org/10.3390/polym11071228.

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Well-defined polymer brushes attached to nanoparticles offer an elegant opportunity for surface modification because of their excellent mechanical stability, functional versatility, high graft density as well as controllability of surface properties. This study aimed to prepare hybrid materials with good dispersion in different solvents, and to endow this material with certain fluorescence characteristics. Well-defined diblock copolymers poly (styrene)-b-poly (hydroxyethyl methyl acrylate)–co-poly (hydroxyethyl methyl acrylate- rhodamine B) grafted silica nanoparticles (SNPs-g-PS-b-PHEMA-co-PHEMA-RhB) hybrid materials were synthesized via surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (SI-ARGET ATRP). The SNPs surfaces were modified by 3-aminopropyltriethoxysilane (KH-550) firstly, then the initiators 2-Bromoisobutyryl bromide (BIBB) was attached to SNPs surfaces through the esterification of acyl bromide groups and amidogen groups. The synthetic initiators (SNPs-Br) were further used for the SI-ARGET ATRP of styrene (St), hydroxyethyl methyl acrylate (HEMA) and hydroxyethyl methyl acrylate-rhodamine B (HEMA-RhB). The results indicated that the SI-ARGET ATRP initiator had been immobilized onto SNPs surfaces, the Br atom have located at the end of the main polymer chains, and the polymerization process possessed the characteristic of controlled/“living” polymerization. The SNPs-g-PS-b-PHEMA-co-PHEMA-RhB hybrid materials show good fluorescence performance and good dispersion in water and EtOH but aggregated in THF. This study demonstrates that the SI-ARGET ATRP provided a unique way to tune the polymer brushes structure on silica nanoparticles surface and further broaden the application of SI-ARGET ATRP.

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Šiller, Lidija, Sunthon Piticharoenphun, Marie Louise Lemloh, Benjamin R. Horrocks, Burkhard Kaulich, Alessandra Gianoncelli, Michael R. C. Hunt, Franz Brümmer, and Davorin Medaković. "Sulphur-Containing Compounds as a Response in Sea Urchins Exposed to Alkylated Silicon Nanocrystals and SiO₂-Coated Iron Oxide Nanoparticles." Key Engineering Materials 672 (January 2016): 312–27. http://dx.doi.org/10.4028/www.scientific.net/kem.672.312.

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We report the effects of exposure to alkylated silicon nanocrystals (‘alkyl-SiNCs’ at concentration ~ 7.2 mg/L) and -Fe2O3 nanoparticles coated with ultra-thin silica (‘SiO2-coated IONPs’ at concentration ~ 150 mg/L) on sea urchins Paracentrotus lividus and Arbacia lixula, respectively, studied with X-ray fluorescence (XRF) and Fourier transform infrared (FTIR) spectroscpoies using excitation from a synchrotron light source. A remarkably low mortality and low incidence of skeletal deformation is observed for exposure to both types of nanoparticles studied, despite the high concentrations employed in this work. XRF mapping demonstrates that both types of nanoparticle are found to agglomerate in the body of the sea urchins. FTIR spectra indicates that alkyl-SiNCs remain intact after ingestion and corresponding XRF maps show increased an oxygen throughout the organisms, possibly related to oxidation products arising from reactive oxygen species generated in the presence of the nanoparticles. Exposure to SiO2-coated IONPs is found to produce sulphur-containing species, which may be the result of a biological response in order to reduce the toxicity of the nanomaterial.

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Singh, Vidyadhar, Cathal Cassidy, Murtaza Bohra, Antony Galea, Zafer Hawash, and Mukhles Sowwan. "Surface Morphology of Films Grown by Size-Selected Ta Nanoparticles." Advanced Materials Research 647 (January 2013): 732–37. http://dx.doi.org/10.4028/www.scientific.net/amr.647.732.

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Tantalum nanoparticle (NP) films have been deposited on silicon substrates, using sputter deposition with gas aggregation. The resultant NP films have been characterized using high resolution atomic force microscopy and X-ray fluorescence spectroscopy. The films remain stable and the NPs maintain a spherical structure on annealing up to 600 °C. In addition to characterization, these NP films have been locally patterned by atomic force microscope scanning of the surface in contact mode.

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He, Xudong, GuangYi Yang, E. Yang, Moli Zhang, Dan Luo, Jingjian Liu, Chongnan Zhao, Qinhua Chen, and Fengying Ran. "Utilizing DNase I and graphene oxide modified magnetic nanoparticles for sensing PD-L1 in human plasma." Sensor Review 41, no. 3 (June 7, 2021): 229–34. http://dx.doi.org/10.1108/sr-04-2020-0087.

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Purpose Based on DNase I and reduced graphene oxide (rGO)-magnetic silicon microspheres (MNPS), a highly sensitive and selective fluorescent probe for the detection of PD-L1 was developed. Design/methodology/approach Here °C we present a feasibility of biosensor to detection of PD-L1 in lung tumors plasma. In the absence of PD-L1°C the PD-L1 aptamer is absorbed on the surface of graphene oxide modified magnetic nanoparticles °8rGO-MNPS°9 and leading to effective fluorescence quenching. Upon adding PD-L1°C the aptamer sequences could be specifically recognized by PD-L1 and the aptamer/PD-L1 complex is formed°C resulting in the recovery of quenched fluorescence. Findings This sensor can detect PD-L1 with a linear range from 100 pg mL−1 to 100 ng mL−1, and a detection limit of 10 pg•m−1 was achieved. Originality/value This method provides an easy and sensitive method for the detection of PD-L1 and will be beneficial to the early diagnosis and prognosis of tumors.

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Pan, Jiabao, Ancheng Ouyang, Wenjuan Fang, Guanghui Cheng, Wei Liu, Fang Wang, Dongmu Zhao, Kai Le, and Jianzhuang Jiang. "cis-Silicon phthalocyanine conformation endows J-aggregated nanosphere with unique near-infrared absorbance and fluorescence enhancement: a tumor sensitive phototheranostic agent with deep tissue penetrating ability." Journal of Materials Chemistry B 8, no. 14 (2020): 2895–908. http://dx.doi.org/10.1039/d0tb00192a.

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41

Levina, Asya S., Marina N. Repkova, Nadezhda V. Shikina, Zinfer R. Ismagilov, Svetlana A. Yashnik, Dmitrii V. Semenov, Yulia I. Savinovskaya, Natalia A. Mazurkova, Inna A. Pyshnaya, and Valentina F. Zarytova. "Non-agglomerated silicon–organic nanoparticles and their nanocomplexes with oligonucleotides: synthesis and properties." Beilstein Journal of Nanotechnology 9 (September 21, 2018): 2516–25. http://dx.doi.org/10.3762/bjnano.9.234.

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The development of efficient and convenient systems for the delivery of nucleic-acid-based drugs into cells is an urgent task. А promising approach is the use of various nanoparticles. Silica nanoparticles can be used as vehicles to deliver nucleic acid fragments into cells. In this work, we developed a method for the synthesis of silicon–organic (Si–NH2) non-agglomerated nanoparticles by the hydrolysis of aminopropyltriethoxysilane (APTES). The resulting product forms a clear solution containing nanoparticles in the form of low molecular weight polymer chains with [─Si(OH)(C3H6NH2)O─] monomer units. Oligonucleotides (ODN) were conjugated to the prepared Si–NH2 nanoparticles using the electrostatic interaction between positively charged amino groups of nanoparticles and negatively charged internucleotide phosphate groups in oligonucleotides. The Si–NH2 nanoparticles and Si–NH2·ODN nanocomplexes were characterized by transmission electron microscopy, atomic force microscopy and IR and electron spectroscopy. The size and zeta potential values of the prepared nanoparticles and nanocomplexes were evaluated. Oligonucleotides in Si–NH2·ODN complexes retain their ability to form complementary duplexes. The Si–NH2 Flu nanoparticles and Si–NH2·ODNFlu nanocomplexes were shown by fluorescence microscopy to penetrate into human cells. The Si–NH2 Flu nanoparticles predominantly accumulated in the cytoplasm whereas ODNFlu complexes were predominantly detected in the cellular nuclei. The Si–NH2·ODN nanocomplexes demonstrated a high antisense activity against the influenza A virus in a cell culture at a concentration that was lower than their 50% toxic concentration by three orders of magnitude.

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42

Sun, Jian, Tao Hu, Chuanxia Chen, Dan Zhao, Fan Yang, and Xiurong Yang. "Fluorescence Immunoassay System via Enzyme-Enabled in Situ Synthesis of Fluorescent Silicon Nanoparticles." Analytical Chemistry 88, no. 19 (September 22, 2016): 9789–95. http://dx.doi.org/10.1021/acs.analchem.6b02847.

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43

Xia, Bing, Wenyi Zhang, Jisen Shi, and Shoujun Xiao. "Fluorescence quenching in luminescent porous silicon nanoparticles for the detection of intracellular Cu2+." Analyst 138, no. 13 (2013): 3629. http://dx.doi.org/10.1039/c3an00503h.

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44

Mo, Jia-qing, Jing Jiang, Zhen-gang Zhai, Fu-gui Shi, and Zhen-hong Jia. "Enhancement of R6G fluorescence by N-type porous silicon deposited with gold nanoparticles." Optoelectronics Letters 13, no. 1 (January 2017): 10–12. http://dx.doi.org/10.1007/s11801-017-6269-5.

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45

Meng, Lei, Yaqing Yuan, Guang Pu, and Na Xu. "An “on–off–on” fluorescence assay based on silicon nanoparticles for selective detection of manganese(ii)." Analytical Methods 9, no. 17 (2017): 2553–60. http://dx.doi.org/10.1039/c7ay00514h.

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46

Levard, Clement, F. Marc Michel, Yingge Wang, Yongseong Choi, Peter Eng, and Gordon E. Brown. "Probing Ag nanoparticle surface oxidation in contact with (in)organics: an X-ray scattering and fluorescence yield approach." Journal of Synchrotron Radiation 18, no. 6 (October 6, 2011): 871–78. http://dx.doi.org/10.1107/s090904951103843x.

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Characterizing interfacial reactions is a crucial part of understanding the behavior of nanoparticles in nature and for unlocking their functional potential. Here, an advanced nanostructure characterization approach to study the corrosion processes of silver nanoparticles (Ag-Nps), currently the most highly produced nanoparticle for nanotechnology, is presented. Corrosion of Ag-Nps under aqueous conditions, in particular in the presence of organic matter and halide species common to many natural environments, is of particular importance because the release of toxic Ag+from oxidation/dissolution of Ag-Nps may strongly impact ecosystems. In this context, Ag-Nps capped with polyvinolpyrrolidone (PVP) in contact with a simple proxy of organic matter in natural waters [polyacrylic acid (PAA) and Cl−in solution] has been investigated. A combination of synchrotron-based X-ray standing-wave fluorescence yield- and X-ray diffraction-based experiments on a sample consisting of an approximately single-particle layer of Ag-Nps deposited on a silicon substrate and coated by a thin film of PAA containing Cl revealed the formation of a stable AgCl corrosion product despite the presence of potential surface stabilizers (PVP and PAA). Diffusion and precipitation processes at the Ag-Nps–PAA interface were characterized with a high spatial resolution using this new approach.

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Chen, Xin, Chao Wang, Min Hao, Hang Zhao, He Xia, Liyang Yu, Dong Li, et al. "Mesoporous Silica Promotes Osteogenesis of Human Adipose-Derived Stem Cells Identified by a High-Throughput Microfluidic Chip Assay." Pharmaceutics 14, no. 12 (December 6, 2022): 2730. http://dx.doi.org/10.3390/pharmaceutics14122730.

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Silicon-derived biomaterials are conducive to regulating the fate of osteo-related stem cells, while their effects on the osteogenic differentiation of human adipose-derived stem cells (hADSCs) remain inconclusive. Mesoporous silica (mSiO2) is synthesized in a facile route that exhibited the capability of promoting osteogenic differentiation of hADSCs. The metabolism of SiO2 in cells is proposed according to the colocalization fluorescence analysis between lysosomes and nanoparticles. The released silicon elements promote osteogenic differentiation. The detection of secretory proteins through numerous parallel experiments performed via a microfluidic chip confirms the positive effect of SiO2 on the osteogenic differentiation of hADSCs. Moreover, constructed with superparamagnetic iron oxide (Fe3O4), the magnetic nanoparticles (MNPs) of Fe3O4@mSiO2 endow the cells with magnetic resonance imaging (MRI) properties. The MNP-regulated osteogenic differentiation of autologous adipose-derived stem cells provides considerable clinical application prospects for stem cell therapy of bone tissue repair with an effective reduction in immune rejection.

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Yuan, Xiaoying, Wendi Lv, Bing Wang, Chenglu Yan, Qiuting Ma, Baozhan Zheng, Juan Du, and Dan Xiao. "Silicon nanoparticles-based ratiometric fluorescence platform: Real-time visual sensing to ciprofloxacin and Cu2+." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 253 (May 2021): 119599. http://dx.doi.org/10.1016/j.saa.2021.119599.

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Ye, Hong-Li, Xi-Wen He, Wen-You Li, and Yu-Kui Zhang. "Two-photon-excited tumor cell fluorescence targeted imaging based on transferrin-functionalized silicon nanoparticles." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 267 (February 2022): 120450. http://dx.doi.org/10.1016/j.saa.2021.120450.

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Kumar, Ravish. "Synthesis, Size Control, and Fluorescence Studies of Silicon Nanoparticles in Carboxymethylated Polypropylene Aqueous Solutions." International Journal of Polymer Analysis and Characterization 13, no. 4 (August 11, 2008): 302–16. http://dx.doi.org/10.1080/10236660802236204.

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