Synthesis of Gold and Silver Nanoparticles and Characterization of Structural, Optical, and Electronic Properties

2011 ◽  
Author(s):  
Eric N. Lee ◽  
Mark H. Griep ◽  
Shashi P. Karna
Keyword(s):  
Silver Nanoparticles ◽  
Electronic Properties ◽  
Gold And Silver Nanoparticles ◽  
Optical And Electronic Properties

scholarly journals Green ultrasonic synthesis, Characterization and Antibacterial activity of Silver and Gold Nanoparticles mediated by Ganoderma lucidum extract

2020 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Metal Nanoparticles ◽  
Cytotoxic Activities ◽  
Gold And Silver Nanoparticles ◽  
Silver And Gold Nanoparticles ◽  
E Coli ◽  
Inhibition Zones

Metal nanoparticles possess an extensive scientific and technological significance due to their unique physiochemical properties and their potential applications in different fields like medicine. Silver and gold nanoparticles have shown to have antibacterial and cytotoxic activities. Conventional methods used in the synthesis of the metal nanoparticles involve use of toxic chemicals making them unsuitable for use in medical field. In our continued effort to explore for simple and eco-friendly methods to synthesize the metal nanoparticles, we here describe synthesis and characterization of gold and silver nanoparticles using Gonaderma lucidum, wild non-edible medicinal mushroom. G. lucidum mushroom contain bioactive compounds which can be involved in the reduction, capping and stabilization of the nanoparticles. Antibacterial activity analysis was done on E. coli and S. aureus. The synthesis was done on ultrasonic bath. Characterization of the metal nanoparticles was done by UV-VIS., High Resolution Transmission Electron Microscope (HRTEM) and FTIR. HRTEM analysis showed that both silver and gold nanoparticles were spherical in shape with an average size of 15.82±3.69 nm for silver and 24.73±5.124nm for gold nanoparticles (AuNPs). FTIR analysis showed OH and -C=C- stretching vibrations, an indication of presence of functional groups of biomolecules capping both gold and silver nanoparticles. AgNPs showed inhibition zones of 15.5±0.09mm and 13.3±0.14mm while AuNPs had inhibition zones of 14.510±0.35 and 13.3±0.50mm on E. coli and S. aureus respectively. The findings indicate the potential use of AgNPs and AuNPs in development of drugs in management of pathogenic bacteria.

Biogenic synthesis, characterization of gold and silver nanoparticles from Coleus forskohlii and their clinical importance

2018 ◽  
Vol 183 ◽  
pp. 251-257 ◽  
Author(s):  
Manikandan Dhayalan ◽  
Michael Immanuel Jesse Denison ◽  
Manikandan Ayyar ◽  
N.N. Gandhi ◽  
Kathiravan Krishnan ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Clinical Importance ◽  
Coleus Forskohlii ◽  
Biogenic Synthesis ◽  
Gold And Silver Nanoparticles

scholarly journals Optical and electronic properties of silver nanoparticles embedded in cerium oxide

2020 ◽  
Vol 152 (11) ◽  
pp. 114704 ◽  
Author(s):  
Jacopo Stefano Pelli Cresi ◽  
Enrico Silvagni ◽  
Giovanni Bertoni ◽  
Maria Chiara Spadaro ◽  
Stefania Benedetti ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Electronic Properties ◽  
Cerium Oxide ◽  
Optical And Electronic Properties

scholarly journals Adiantum philippense L. Frond Assisted Rapid Green Synthesis of Gold and Silver Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Duhita G. Sant ◽  
Tejal R. Gujarathi ◽  
Shrikant R. Harne ◽  
Sougata Ghosh ◽  
Rohini Kitture ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Biomedical Applications ◽  
Capping Agent ◽  
Ftir Analysis ◽  
Optimum Conditions ◽  
Gold And Silver Nanoparticles ◽  
Synthesis Of Nanoparticles ◽  
Medicinal Value

Development of an ecofriendly, reliable, and rapid process for synthesis of nanoparticles using biological system is an important bulge in nanotechnology. Antioxidant potential and medicinal value of Adiantum philippense L. fascinated us to utilize it for biosynthesis of gold and silver nanoparticles (AuNPs and AgNPs). The current paper reports utility of aqueous extract of A. philippense L. fronds for the green synthesis of AuNPs and AgNPs. Effect of various parameters on synthesis of nanoparticles was monitored by UV-Vis spectrometry. Optimum conditions for AuNPs synthesis were 1 : 1 proportion of original extract at pH 11 and 5 mM tetrachloroauric acid, whereas optimum conditions for AgNPs synthesis were 1 : 1 proportion of original extract at pH 12 and 9 mM silver nitrate. Characterization of nanoparticles was done by TEM, SAED, XRD, EDS, FTIR, and DLS analyses. The results revealed that AuNPs and AgNPs were anisotropic. Monocrystalline AuNPs and polycrystalline AgNPs measured 10 to 18 nm in size. EDS and XRD analyses confirmed the presence of elemental gold and silver. FTIR analysis revealed a possible binding of extract to AuNPs through –NH2 group and to AgNPs through C=C group. These nanoparticles stabilized by a biological capping agent could further be utilized for biomedical applications.

Synthesis and characterization of multifunctional gold and silver nanoparticles using leaf extract ofNaregamia alataand their applications in the catalysis and control of mastitis

2017 ◽  
Vol 41 (23) ◽  
pp. 14288-14298 ◽  
Author(s):  
Sijo Francis ◽  
Siby Joseph ◽  
Ebey P. Koshy ◽  
Beena Mathew
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Synthesis And Characterization ◽  
Gold And Silver Nanoparticles ◽  
And Control

Phytoreduced nanoparticles have multi-functionalities due to their sustainable origin and biocompatible nature.

scholarly journals SERS Characterization of the Indocyanine-Type Dye IR-820 on Gold and Silver Nanoparticles in the Near Infrared

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Tatiana B. V. Neves ◽  
Gustavo F. S. Andrade
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Raman Spectrum ◽  
High Performance ◽  
Near Infrared ◽  
Cyanine Dyes ◽  
Metallic Surface ◽  
Gold And Silver Nanoparticles ◽  
Biological Compatibility

The Raman spectrum of the indocyanine-type dye IR-820 has been assigned for both solid and solution. SERS spectra of IR-820 on both silver and gold nanoparticles suspensions excited at 1064 nm were obtained. AgNPs allowed the detection of the dye through SERS down to 0.1 micromoles per liter; for the AuNPs the lowest concentration of the dye detectable was 10 micromoles per liter. Changes in the SERS relative intensities compared to the Raman spectrum in solution are subtle, mostly due to the preresonance effect of the dye. However, a perpendicular orientation relative to the metallic surface was inferred for the dye on both AgNPs and AuNPs. The easily distinguishable SERS spectra of the dye excited at 1064 nm, together with the high biological compatibility of cyanine dyes, are both indicative that IR-820 could be used as a high-performance probe molecule for SERS.

Characterization of citrates on gold and silver nanoparticles

2015 ◽  
Vol 438 ◽  
pp. 244-248 ◽  
Author(s):  
Priastuti Wulandari ◽  
Takeshi Nagahiro ◽  
Nobuko Fukada ◽  
Yasuo Kimura ◽  
Michio Niwano ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Gold And Silver Nanoparticles
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