Green synthesis of gold nanoparticles under sunlight irradiation and their colorimetric detection of Ni2+ and Co2+ ions

RSC Advances ◽  
2015 ◽  
Vol 5 (15) ◽  
pp. 11458-11468 ◽  
Author(s):  
M. Annadhasan ◽  
J. Kasthuri ◽  
N. Rajendiran
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Energy Efficient ◽  
Colorimetric Detection ◽  
One Pot ◽  
Sunlight Irradiation ◽  
Natural Sunlight ◽  
Efficient Route

A novel, green, one-pot and energy efficient route has been developed for the synthesis of gold nanoparticles by natural sunlight irradiation, and they were utilized effectively for the colorimetric detection of Ni2+ and Co2+ ions.

One-pot, green synthesis of gold nanoparticles by gelatin and investigation of their biological effects on Osteoblast cells

2015 ◽  
Vol 132 ◽  
pp. 122-131 ◽  
Author(s):  
Sorina Suarasan ◽  
Monica Focsan ◽  
Olga Soritau ◽  
Dana Maniu ◽  
Simion Astilean
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Biological Effects ◽  
Osteoblast Cells ◽  
One Pot

scholarly journals Facile and One Pot Synthesis of Gold Nanoparticles Using Tetraphenylborate and Polyvinylpyrrolidone for Selective Colorimetric Detection of Mercury Ions in Aqueous Medium

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Sidhureddy Boopathi ◽  
Shanmugam Senthilkumar ◽  
Kanala Lakshminarasimha Phani
Keyword(s):  
Gold Nanoparticles ◽  
Alkaline Medium ◽  
Color Change ◽  
Colorimetric Detection ◽  
Spherical Shape ◽  
Reducing Agent ◽  
Nanoparticle Dispersion ◽  
Mercury Ions ◽  
One Pot ◽  
Resonance Band

In this work, we reported for the first time, a facile and one step synthesis of gold nanoparticles from HAuCl4, employing tetraphenylborate as the reducing agent. The synthesis is not only facile but also yields “dumb-bell-shaped”particles. This shape appears to arise from a possible emulsion of the products of oxidation/decomposition of tetraphenylborate by HAuCl4, surrounding the particle. The size and shape of the AuNPs were characterized by Transmission electron microscopy (TEM) and UV-visible Spectroscopy. Interestingly, the addition of polyvinylpyrrolidone (PVP) during the synthesis was found to enhance the stability of the nanoparticle dispersion. The particles synthesized under these conditions assume “spherical” shape with the appearance of only transverse surface plasmon resonance band. The highlight of the observations is that the gold nanoparticles synthesized using tetraphenylborate as reducing agent and PVP as stabilizer are highly stable in alkaline medium, in contrast to the synthesis wherein borohydride is used as reducing agent. The AuNPs synthesized using tetraphenylborate and PVP show their mercury sensing behavior only in the alkaline medium. The color of the nanoparticle dispersion undergoes distinct color change from pink to blue with the addition of mercury ions. They also show dramatic selectivity to mercury ions in presence of other interfering ions, Pb2+, Zn2+and Ca2+.

Facile Green Synthesis of Gold Nanoparticles with Carboxymethyl Gum Karaya, Selective and Sensitive Colorimetric Detection of Copper (II) Ions

2017 ◽  
Vol 28 (5) ◽  
pp. 2873-2890 ◽  
Author(s):  
Bhagavanth Reddy Gangapuram ◽  
Rajkumar Bandi ◽  
Ramakrishna Dadigala ◽  
Girija Mangathayaru Kotu ◽  
Veerabhadram Guttena
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Colorimetric Detection ◽  
Gum Karaya
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