Optical properties of core-shell gold-silver and silver-gold nanoparticles for some laser wavelengths

2008 ◽  
Author(s):  
Victor K. Pustovalov ◽  
Karsten König ◽  
Liudmila G. Astafyeva ◽  
Wolfgang Fritzsche
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Core Shell ◽  
Gold Silver

Core–shell gold/silver nanoparticles: Synthesis and optical properties

2013 ◽  
Vol 392 ◽  
pp. 90-95 ◽  
Author(s):  
Lu Lu ◽  
Gwendolyn Burkey ◽  
Ionel Halaciuga ◽  
Dan V. Goia
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Core Shell ◽  
Gold Silver ◽  
Nanoparticles Synthesis

scholarly journals Surface-confined core–shell structures based on gold nanoparticles and metal–organic networks

2014 ◽  
Vol 50 (35) ◽  
pp. 4635-4638 ◽  
Author(s):  
Revital Kaminker ◽  
Michal Lahav ◽  
Marc Altman ◽  
Guennadi Evmenenko ◽  
Pulak Dutta ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Gold Nanoparticle ◽  
Shell Structures ◽  
Core Shell ◽  
Metal Organic ◽  
Organic Networks

A gold nanoparticle platform enhances the optical properties and order in a metal–organic network (MON).

Polymer-embedded gold and gold/silver nanoparticle-modified electrodes and their applications in catalysis and sensors

2011 ◽  
Vol 83 (11) ◽  
pp. 2041-2053 ◽  
Author(s):  
Shanmugam Manivannan ◽  
Ramasamy Ramaraj
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Sol Gel ◽  
Simultaneous Detection ◽  
Modified Electrodes ◽  
Core Shell ◽  
Electrochemical Characteristics ◽  
Amine Functionalized ◽  
Gold Silver ◽  
Vis Spectroscopy

Metal nanoparticles encapsulated by silicate sol-gel matrix find numerous applications particularly in electrocatalysis and sensors. In our previous reports, we have reported the mono- and bi-metal gold, silver, and core/shell gold/silver nanoparticles embedded in functionalized silicate sol-gel matrices. Modified electrodes were fabricated using mono- and bi-metallic gold, silver, and core/shell gold/silver nanoparticles embedded in silicate sol-gel, and they were used for the electrocatalysis and sensing of H2O2 and simultaneous detection of hydrazine, sulfite, and nitrite. We have prepared the gold nanoparticles encapsulated by amine-functionalized silicate sol-gel matrix in a single step without using any external reducing agents. The gold nanoparticles were also synthesized by using amine-functionalized silane monomer in the presence of β-cyclodextrin (β-CD), resulting in metal/polymer core/shell nanostructures. This nanocomposite material showed a synergistic stabilizing effect when compared to either silicate sol-gel matrix or β-CD alone as stabilizer. The synthesized gold nanoparticles were characterized using UV–vis spectroscopy and high-resolution transmission electron microscopy. Modified electrodes were prepared by using the gold nanoparticles embedded in silicate sol-gel matrix, and their electrochemical characteristics were studied.

Seed-mediated growth of large, monodisperse core–shell gold–silver nanoparticles with Ag-like optical properties

2002 ◽  
pp. 144-145 ◽  
Author(s):  
Lehui Lu ◽  
Haishui Wang ◽  
Yonghui Zhou ◽  
Shiquan Xi ◽  
Hongjie Zhang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Core Shell ◽  
Gold Silver ◽  
Seed Mediated

Numerical study of the optical properties of core-shell bimetallic nanospheres gold-gold and gold-silver: comparison to experiment

2013 ◽  
Vol 5 (4) ◽  
pp. 53-69
Author(s):  
A. Ouari ◽  
M. Benhamou ◽  
A. Akouibaa ◽  
A. Derouiche ◽  
A.R. Senoudi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Numerical Study ◽  
Core Shell ◽  
Gold Silver

Sensitivity Enhancement in the Colorimetric/Spectroscopic Determination of Lysozyme Concentration in Nanomolar Level with Colloidal Citrate Capped Au@Ag Core-Shell Nanoparticles

2020 ◽  
Vol 10 ◽  
Author(s):  
Tapanendu Kamilya ◽  
Amit Kumar Bhunia ◽  
Pijus K. Samanta ◽  
Satyajit Saha ◽  
Rudra N. Mondal ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Gold And Silver Nanoparticles ◽  
Gold Silver ◽  
Lysozyme Concentration ◽  
Core Shell Nanoparticles ◽  
Silver Core ◽  
Higher Sensitivity

Background: Lysozyme level in body fluids is a significant indicator of various diseases. Cheap and simple colorimetric detection of lysozyme, in biological sample, by gold and silver nanoparticles is a field of interest of nanoparticle research for more than a decade Objective: We report here an attempt to improve the sensitivity part of the colorimetric lysozyme detection process by using citrate capped gold-silver core-shell nanoparticles without any functionalization Methods: Performance of gold-silver core-shell nanoparticles in determining of lysozyme concentration in water has been done using colorimetric/spectroscopic technique. Studies have also been done with gold nanoparticles, silver nanoparticles and mixed colloidal suspension of gold and silver nanoparticles, for comparison. Selectivity study has been done through spectroscopic analysis, red-green-blue colour component analysis and fractal dimension analysis of the nanoparticles interacted with several low and high isoelectric proteins Results: Gold-silver core-shell nanoparticles showed higher sensitivity for a wider range of lysozyme concentration compared to gold and silver nanoparticles prepared by us or reported in literatures. Gold nanoparticles showed higher sensitivity compared to the core-shell nanoparticles, but for a narrow concentration range of lysozyme. For silver nanoparticles and the mixed nanoparticle system, both sensitivity and range of determination of lysozyme concentration were much smaller compared to the core-shell nanoparticles. Core-shell nanoparticles showed better selectivity compared to gold nanoparticles in identifying aquatic solution of lysozyme from that of other proteins Conclusion: Gold-silver core-shell nanoparticles have higher sensitivity in determining wide range of lysozyme concentration in water compared to gold and silver nanoparticles reported in literatures

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