Fabrication of uniform Ge-nanocrystals embedded in amorphous SiO2 films using Ge-ion implantation and neutron irradiation methods

Catalytic nanoparticles represent a potential clinical approach to replace or correct aberrant enzymatic activities in patients. Several diseases, including many blinding eye diseases, are promoted by excessive oxidant stress due to reactive oxygen species (ROS). Cerium oxide and platinum nanoparticles represent two potentially therapeutic nanoparticles that de-toxify ROS. In the present study we directly compare these two classes of catalytic nanoparticles. Cerium oxide and platinum nanoparticles were found to be 16±2.4 nm and 1.9±0.2 nm in diameter, respectively. Using surface plasmon enhanced microscopy, we find that these nanoparticles associate with cells. Furthermore, cerium oxide and platinum nanoparticles demonstrated superoxide dismutase catalytic activity, but did not promote hemolytic or cytolytic pathways in living cells. Importantly, both cerium oxide and platinum nanoparticles reduce oxidant-mediated apoptosis in target cells as judged by the activation of caspase 3. The ability to diminish apoptosis may contribute to maintaining healthy tissues.

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“…Transmission electron microscopy images were obtained with a 200 kV JEOL 2010F microscope, as previously described (Chen et al, 2011). …”

Section: Methodsmentioning

confidence: 99%

Cerium oxide and platinum nanoparticles protect cells from oxidant-mediated apoptosis

et al. 2011

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“…The calculation detail can be seen from our previous work. [42][43][44] Only a brief description will be given here. The calculations are performed using the first-principles plane wave pseudopotential method based on DFT incorporated into the CASTEP computational code.…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen from Table 1 that the all fitted Raman spectra display a peak shift (Δω) to high wave number from the natural frequency (D peak centered at 1345 cm −1 and the G peak at around 1520–1580 cm −1 ) 34 and the sample with the SiN x interlayer has the least G peak shift. Raman spectroscopy has been used to measure stress incrystalline 42 and polycrystalline 26 materials. As reported about diamond, 29,30 graphite 27 and amorphous carbon films, 40 residual stress in the carbon materials changes the lattice spring constants, which can in turn change the Raman peak position.…”

Section: Resultsmentioning

confidence: 99%

Effects of SiN_x interlayer on characterisation of amorphous diamond-like carbon films

Chen

Shih

Shen

et al. 2015

Materials Science and Technology

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The magnetron sputtering amorphous diamond-like carbon film is successfully deposited by SiNx interlayer approach. The scanning electron microscopy study reveals the creation of high uniform surface micrograph diamond-like carbon films with SiNx interlayer. For comparison, diamond-like carbon films with different interlayers are also grown. The Raman spectra are analyzed in order to characterize the stressed induce peak shifts of the films. The interactions of C atom with Si(100) and SiNx surface are studied by density functional theory simulation. The effects of interlayers on the films deposition and the considering deposition mechanism are discussed. It is suggested that the diamond-like carbon and SiNx bilayer structure can help to render applications in protective coatings and high quality silicon on diamond related radiation tolerance devices.

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“…NTD is a technique commonly used to dope bulk silicon, but for the NCs is not much explored. Recently, the promising application of the NTD for arsenic doping of Ge-NCs has been reported [30].…”

Section: Ion Implantationmentioning

confidence: 99%

An Outlook on Silicon Nanocrystals for Optoelectronics

Capan

Carvalho

Coutinho

2016

JGE

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Silicon nanocrystals have emerged as promising material components which extend the realm of the application of its bulk counterpart beyond traditional boundaries. Over the last two decades of research, their potential for application on areas that range from optoelectronics to information storage has been progressively unraveled. Nevertheless, as technology steps forward, new challenges are arising. Here we consider what has been achieved and what are the current limitations on the fields of growth, characterization and modeling of silicon nanocrystals.

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Fabrication of uniform Ge-nanocrystals embedded in amorphous SiO2 films using Ge-ion implantation and neutron irradiation methods

Abstract: Articles you may be interested inStructural and optical properties of size controlled Si nanocrystals in Si3N4 matrix: The nature of photoluminescence peak shift

Cited by 10 publications

References 26 publications

Cerium oxide and platinum nanoparticles protect cells from oxidant-mediated apoptosis

Cerium oxide and platinum nanoparticles protect cells from oxidant-mediated apoptosis

Effects of SiN_x interlayer on characterisation of amorphous diamond-like carbon films

An Outlook on Silicon Nanocrystals for Optoelectronics

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Fabrication of uniform Ge-nanocrystals embedded in amorphous SiO2 films using Ge-ion implantation and neutron irradiation methods

Abstract: Articles you may be interested inStructural and optical properties of size controlled Si nanocrystals in Si3N4 matrix: The nature of photoluminescence peak shift

Cited by 10 publications

References 26 publications

Cerium oxide and platinum nanoparticles protect cells from oxidant-mediated apoptosis

Cerium oxide and platinum nanoparticles protect cells from oxidant-mediated apoptosis

Effects of SiNx interlayer on characterisation of amorphous diamond-like carbon films

An Outlook on Silicon Nanocrystals for Optoelectronics

Contact Info

Product

Resources

About

Effects of SiN_x interlayer on characterisation of amorphous diamond-like carbon films