Single Particle Studies on Plasmon Enhanced Photoluminescence of Monolayer MoS2 by Gold Nanoparticles of Different Shapes

2021 ◽  
Author(s):  
Monalisa Garai ◽  
Ziyu Zhu ◽  
Jia Shi ◽  
Shisheng Li ◽  
Qing-Hua Xu
Keyword(s):  
Gold Nanoparticles ◽  
Single Particle ◽  
Monolayer Mos2 ◽  
Enhanced Photoluminescence ◽  
Different Shapes

Potential of rod, sphere and semi-cube shaped gold nanoparticles to induce cytotoxicity and genotoxicity in human blood lymphocytes in vitro

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Mona A.M. Abo-Zeid ◽  
Thomas Liehr ◽  
Amira M. Gamal-Eldeen ◽  
Mahmoud Zawrah ◽  
Mostafa Ali ◽  
...  
Keyword(s):  
Cell Proliferation ◽  
Gold Nanoparticles ◽  
Mitotic Activity ◽  
Human Blood ◽  
Human Peripheral Blood ◽  
Human Lymphocytes ◽  
Blood Lymphocytes ◽  
Human Blood Lymphocytes ◽  
Different Shapes

AbstractGold nanoparticles (GNPs) are intended to be used in nanomedicine. Due to nanotechnology innovation GNPs of variable sizes and in different shapes including rods, spheres, cubes, etc., can easily be produced. The aim of the present studies was to evaluate the cyto-and genotoxicity inducible by different shaped GNPs on normal human peripheral blood lymphocytes.Four different shapes of GNPs including big rod GNPs (BR-GNPs, 50 nm), small rod GNPs (SR-GNPs, 30 nm), sphere GNPs (S-GNPs, 15 nm) and semi-cube GNPs (SC-GNPs, 15 nm) were studied. Cultured human blood lymphocytes were treated with different concentrations of these GNPs for 24 h in vitro. Cytotoxicity was evaluated based on the mitotic index (MI), while genotoxicity was studied by an interphase-fluorescence in situ hybridization (I-FISH) assay. The following genes were studied in I-FISH:The lowest concentration of BR-GNPs neither had an effect mitotic activity nor enhanced gain or loss of examined gene signals in a significant manner with I-FSH. Other concentrations of BR-GNPs, SR-GNPs, S-GNPs and SC-GNPs with all concentrations inhibited the mitotic activity of the cells and reduced the cell proliferation highly significantly. The different types of GNPs initiated the duplication ofGNPs at high concentration can reduce the cell proliferation and induce DNA damage. Low concentration of rod-shaped GNPs at 50 nm was safe on human lymphocytes. Further research studies are required to optimize the concentration, shape and size of GNPs before using them in nanomedicine.

Size analysis of large-sized gold nanoparticles using single particle ICP-mass spectrometry

2020 ◽  
Vol 35 (12) ◽  
pp. 2834-2839
Author(s):  
Shuji Yamashita ◽  
Akira Miyake ◽  
Takafumi Hirata
Keyword(s):  
Mass Spectrometry ◽  
Gold Nanoparticles ◽  
Single Particle ◽  
Size Range ◽  
Size Analysis ◽  
Polyatomic Ions ◽  
Icp Mass Spectrometry

The analytical size range of nanoparticles are expanded toward a larger region using polyatomic ions.

scholarly journals Enhanced Photoluminescence in Gold Nanoparticles Doped Homogeneous Planar Nematic Liquid Crystals

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Chi-Huang Chang ◽  
Rong-Ji Lin ◽  
Chuen-Lin Tien ◽  
Shang-Min Yeh
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Surface Area ◽  
Nematic Liquid Crystals ◽  
Subsequent Decay ◽  
Enhanced Photoluminescence ◽  
Pl Intensity

This study reported the photoluminescence (PL) of gold nanoparticles (GNPs) doped planar nematic liquid crystals (NLCs) and observed around 64% enhancement in PL intensity with suitable doping amounts of GNPs in liquid crystals 5CB. The enhancement in PL intensity has been attributed to the increased surface area from GNPs, which results in increased emissions due to the increased scattering of excitation. The subsequent decay of PL intensity with doping more amounts of GNPs in liquid crystals 5CB was due to the aggregation of the GNPs, which resulted in decayed emissions due to the decay of the scattering of excitation. The concentration and the size of GNPs, as well as the orientation of the LCs’ director, with respect to the excitation, which depend on the intensity of the PL, were also investigated.

Enhanced Photoluminescence from Micellar Assemblies of Cadmium Sulfide Quantum Dots and Gold Nanoparticles

2013 ◽  
Vol 117 (6) ◽  
pp. 3122-3133 ◽  
Author(s):  
Tânia Ribeiro ◽  
T. J. V. Prazeres ◽  
Matthew Moffitt ◽  
J. P. S. Farinha
Keyword(s):  
Quantum Dots ◽  
Gold Nanoparticles ◽  
Cadmium Sulfide ◽  
Enhanced Photoluminescence
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