scholarly journals Antibacterial properties of synthesized Ag and Ag@SiO2 core–shell nanoparticles: a comparative study

2018 ◽  
Vol 96 (8) ◽  
pp. 955-960 ◽  
Author(s):  
Debashish Acharya ◽  
Bidhan Mohanta ◽  
Piyush Pandey ◽  
Farnaj Nasiri
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Reduction ◽  
Porous Silica ◽  
Antibacterial Properties ◽  
Core Shell ◽  
Prolonged Release ◽  
Shell Nanoparticles ◽  
Visible Absorption ◽  
Morphological Studies ◽  
Core Shell Nanoparticles

Spherical bare silver nanoparticles (AgNPs) and silica-coated silver nanoparticles (Ag@SiO2) have been prepared using the one-step chemical reduction method. The optical, structural, and morphological studies were done by UV–visible absorption spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The antibacterial effects of AgNP and Ag@SiO2 were further compared based on diameter of zone of inhibition and minimum inhibitory concentration (MIC) test against B. subtilis AST5–2, S. aureus ATCC 25923, S. marcescens AL2–16, and K. pneumoniae AWD5. Enhanced antibacterial activities were observed for Ag@SiO2 core–shell nanoparticles as compared to AgNPs against all tested bacteria. The results were attributed to the prolonged release of Ag (I) through porous silica shell that inhibits the growth of tested bacteria and also infers the possibility to be used in potential antibacterial applications.

scholarly journals Functionalized porous silica&maghemite core-shell nanoparticles for applications in medicine: design, synthesis, and immunotoxicity

2016 ◽  
Vol 57 (2) ◽  
pp. 165-178 ◽  
Author(s):  
Beata A. Zasońska ◽  
Aurélia Líšková ◽  
Miroslava Kuricová ◽  
Jana Tulinská ◽  
Ognen Pop-Georgievski ◽  
...  
Keyword(s):  
Porous Silica ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Design Synthesis ◽  
Core Shell Nanoparticles

scholarly journals Characterization of silver-polymer core–shell nanoparticles using electron microscopy

Nanoscale ◽  
2018 ◽  
Vol 10 (19) ◽  
pp. 9186-9191 ◽  
Author(s):  
Nathalie Claes ◽  
Ramesh Asapu ◽  
Natan Blommaerts ◽  
Sammy W. Verbruggen ◽  
Silvia Lenaerts ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Using electron microscopy, polymer encapsulated silver nanoparticles were visualized and their coverage, molecular structure and plasmonic properties could be investigated.

scholarly journals Enhancing the Photovoltaic Performance of Perovskite Solar Cells Using Plasmonic Au@Pt@Au Core-Shell Nanoparticles

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1263 ◽  
Author(s):  
Bao Wang ◽  
Xiangyu Zhu ◽  
Shuhan Li ◽  
Mengwei Chen ◽  
Nan Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Chemical Reduction ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Local Surface Plasmon Resonance ◽  
Core Shell Nanoparticles

Au@Pt@Au core-shell nanoparticles, synthesized through chemical reduction, are utilized to improve the photoelectric performance of perovskite solar cells (PSCs) in which carbon films are used as the counter electrode, and the hole-transporting layer is not used. After a series of experiments, these Au@Pt@Au core-shell nanoparticles are optimized and demonstrate outstanding optical and electrical properties due to their local surface plasmon resonance and scattering effects. PSC devices containing 1 wt.% Au@Pt@Au core-shell nanoparticles have the highest efficiency; this is attributable to their significant light trapping and utilization capabilities, which are the result of the distinctive structure of the nanoparticles. The power conversion efficiency of PSCs, with an optimal content of plasmonic nanoparticles (1 wt.%), increased 8.1%, compared to normal PSCs, which was from 12.4% to 13.4%; their short-circuit current density also increased by 5.4%, from 20.5 mA·cm−2 to 21.6 mA·cm−2. The open-circuit voltages remaining are essentially unchanged. When the number of Au@Pt@Au core-shell nanoparticles in the mesoporous TiO2 layer increases, the photovoltaic parameters of the former shows a downward trend due to the recombination of electrons and holes, as well as the decrease in electron transporting pathways.

Fabrication of silica/polyrhodanine core/shell nanoparticles and their antibacterial properties

2011 ◽  
Vol 21 (48) ◽  
pp. 19317 ◽  
Author(s):  
Jooyoung Song ◽  
Hee Song ◽  
Hyeyoung Kong ◽  
Jin-Yong Hong ◽  
Jyongsik Jang
Keyword(s):  
Antibacterial Properties ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Enhancement of Luminescence Efficiency of Y2O3 Nanophosphor via Core/Shell Structure

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1563
Author(s):  
Jae-Young Hyun ◽  
Ki-Hyun Kim ◽  
Jae-Pil Kim ◽  
Won-Bin Im ◽  
Kadathala Linganna ◽  
...  
Keyword(s):  
Annealing Temperature ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Core Shell ◽  
Molten Salt Method ◽  
Shell Nanoparticles ◽  
Morphological Studies ◽  
Luminescence Efficiency ◽  
Higher Temperature ◽  
Core Shell Nanoparticles

We successfully fabricated Y2O3:RE3+ (RE = Eu, Tb, and Dy) core and core–shell nanophosphors by the molten salt method and sol–gel processes with Y2O3 core size of the order of 100~150 nm. The structural and morphological studies of the RE3+-doped Y2O3 nanophosphors are analyzed by using XRD, SEM and TEM techniques, respectively. The concentration and annealing temperature dependent structural and luminescence characteristics were studied for Y2O3:RE3+ core and core–shell nanophosphors. It is observed that the XRD peaks became narrower as annealing temperature increased in the core–shell nanophosphor. This indicates that annealing at higher temperature improves the crystallinity which in turn enhances the average crystallite size. The emission intensity and quantum yield of the Eu3+-doped Y2O3 core and core–shell nanoparticles increased significantly when annealing temperature is varied from 450 to 550 °C. No considerable variation was noticed in the case of Y2O3:Tb3+ and Y2O3:Dy3+ core and core–shell nanophosphors.

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