One-step synthesis of water-dispersible silicon nanoparticles and their use in fluorescence lifetime imaging of living cells

Wang, Jing; Ye, Dai-Xin; Liang, Guohai; Chang, Jian; Kong, Jilie; Chen, Jiyao

doi:10.1039/c4tb00366g

Cited by 151 publications

(118 citation statements)

References 35 publications

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“…A water dispersible Si NPs of 2 nm mean diameter with quantum yield of 0.21 have been synthesized to serve as novel candidates for lifetime fluorescence imaging of living cells. These developed NPs also possess the characteristics of high photo-stability, pH stability, as well as non-toxic to biological entities (Wang et al 2014b). …”

Section: Medical Prospects Of Metallic Nanoparticlesmentioning

confidence: 98%

Metallic Nanoparticles, Toxicity Issues and Applications in Medicine

Singla

Guliani

Kumari

et al. 2016

Nanoscale Materials in Targeted Drug Delivery, Theragnosis and Tissue Regeneration

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The metallic nanoparticles (NPs) and their synthetic biology are an active area fascinating both the academics as well as scientific research applications in the field of nanotechnology. These nanostructures are a versatile class of materials such as metal NPs, metal oxide NPs, magnetic NPs and quantum dots for biomedical sciences and engineering due to their huge potential. A handful number of methods are adopted for the synthesis of one or the other kind of metal NPs which includes physical and chemical approaches. Each of the chemical and physical synthesis procedures deals with some limitations such as cost ineffectiveness, use of hazardous chemicals, formation of toxic end products and involvement of high-energy processes. To overcome these drawbacks, an alternative approach of environmentally benign and inexpensive biological synthesis mediated by plants or microbes has been essentially adopted. The variations in size, shape and surface chemistry of NPs affect the properties of metal NPs to a greater extent which in turn have an influence on their biological behaviour. Few metal NPs offer unique optical properties while others possess paramagnetic behaviour and quantum size effect which make them suitable in bio-imaging diagnostic techniques. Some metallic NPs play a role in tissue engineering and other therapeutic applications due to their ease of surface modifications, large surface area to volume ratio, unique electrical and anti-microbial activities. Instead of multi-disciplinary applications of metallic NPs, there is a great concern regarding the toxicity issues associated with the use of these NPs which need to be sorted out by looking out certain ways for favourable architecture involving the synthesis methods and parameters for designing the non-toxic NPs for improving the quality of life.

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Section: Medical Prospects Of Metallic Nanoparticlesmentioning

confidence: 98%

Metallic Nanoparticles, Toxicity Issues and Applications in Medicine

Singla

Guliani

Kumari

et al. 2016

Nanoscale Materials in Targeted Drug Delivery, Theragnosis and Tissue Regeneration

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“…The use of nano-particles (NPs) is increasing in science, industry and medicine [1][2][3][4][5]. In most applications, a very good knowledge of the properties of NPs is desired.…”

Section: Introductionmentioning

confidence: 99%

Combining SAXS and DLS for simultaneous measurements and time-resolved monitoring of nanoparticle synthesis

Schwamberger

Roo

Jacob³

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…However, it has some limitations in the range of energies of photon absorption because only photons with energy greater than the bandgap can be absorbed by the material. The aforementioned shortcoming could be addressed by using photoluminescent quantum dots that exhibit a Stokes shift [3,4] as a method to improve the spectral response of short wavelength photons in silicon solar cells by absorbing photons in the range of 300-450 nm and re-emitting in the range of 500-600 nm where the device exhibits a better response. To this end.…”

mentioning

confidence: 99%

“…we report the synthesis and characterization of silicon (Si) and zinc oxide (ZnO) quantum dots (QDs), that exhibit the aforementioned down-shifting photoluminescent characteristics, and their deployment on photovoltaic devices. The Si QDs were synthesized in a water-based colloidal solution [4] and for their application in the photovoltaic devices, they were deposited directly on the surface of solar cells.Additionally, ZnO QDs were synthesized in an ethanol-based colloidal solution employing a controlled precipitation method [5] and were subsequently dispersed in a matrix of polymethyl methacrylate (PMMA) prior to being deployed on solar cells for the corresponding absorption and photoluminescent response characterization. Si QDs exhibited a photoluminescence peak centered around 540 nm as can be seen in Figure 1(a), while ZnO QDs had a photoluminescent peak centered around 530 nm as shown in Figure 1(b).…”

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confidence: 99%

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confidence: 99%

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Solar Cell Power Conversion Efficiency Dependence on Multilayered Si and ZnO QD films

Cordova-Rubio¹,

Lopez-Delgado

Zazueta-Raynaud

et al. 2018

Microsc Microanal

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In recent years, solar cells have typically been made of silicon because the efficiency that these photovoltaic devices present is relatively high [1,2]. However, it has some limitations in the range of energies of photon absorption because only photons with energy greater than the bandgap can be absorbed by the material. The aforementioned shortcoming could be addressed by using photoluminescent quantum dots that exhibit a Stokes shift [3,4] as a method to improve the spectral response of short wavelength photons in silicon solar cells by absorbing photons in the range of 300-450 nm and re-emitting in the range of 500-600 nm where the device exhibits a better response. To this end. we report the synthesis and characterization of silicon (Si) and zinc oxide (ZnO) quantum dots (QDs), that exhibit the aforementioned down-shifting photoluminescent characteristics, and their deployment on photovoltaic devices. The Si QDs were synthesized in a water-based colloidal solution [4] and for their application in the photovoltaic devices, they were deposited directly on the surface of solar cells.Additionally, ZnO QDs were synthesized in an ethanol-based colloidal solution employing a controlled precipitation method [5] and were subsequently dispersed in a matrix of polymethyl methacrylate (PMMA) prior to being deployed on solar cells for the corresponding absorption and photoluminescent response characterization. Si QDs exhibited a photoluminescence peak centered around 540 nm as can be seen in Figure 1(a), while ZnO QDs had a photoluminescent peak centered around 530 nm as shown in Figure 1(b). The thickness of the photoluminescent coatings for silicon solar cells was theoretically optimized to minimize reflectivity effects and experimentally verified for a variety of configurations. Transmission electron microscopy (TEM) images for ZnO and Si QDs were obtained using a JEOL 2010-F microscope operating at 200 kV (see figure 2). The IV performance of the solar cells, including open circuit and short-circuit conditions, was collected using an Orien Sol2A solar simulator under AM1.5G illumination and standard test conditions of 100mW / cm2 at room temperature, and the data was analyzed to extract the power conversion efficiency. In addition, external quantum efficiency (EQE) versus wavelength data collection was performed with a Newport External Quantum Efficiency Measurement System (QEPVSI-B). The incorporation of these films on the window side of the photovoltaic devices triggered improvements in their performance. Specifically, the collected results indicate an improvement produced by the influence of the coatings of Si QD for 5000 or 6000 rpm, as well as the coating of ZnO QD while varying QD concentration. After the deployment of the first coating of Si QDs, the solar cells exhibited an increase in PCE, which increased even more with the second coating of ZnO QDs. Ostensibly, it is feasible to vary both QD concentration and film thickness to optimize the ultimate PCE value using numerical methods to calculate the reflect...

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One-step synthesis of water-dispersible silicon nanoparticles and their use in fluorescence lifetime imaging of living cells

Abstract: Fluorescence intensity (upper panel) and lifetime (bottom panel) images of KB cells stained with FITC (B), Si NPs (C) and unstained control (A).

Cited by 151 publications

References 35 publications

Metallic Nanoparticles, Toxicity Issues and Applications in Medicine

Metallic Nanoparticles, Toxicity Issues and Applications in Medicine

Combining SAXS and DLS for simultaneous measurements and time-resolved monitoring of nanoparticle synthesis

Solar Cell Power Conversion Efficiency Dependence on Multilayered Si and ZnO QD films

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