Effect of Acidic and Basic Conditions on the Plasmon Band of Colloidal Silver

Hafiza S. SHABBEER; Asad Muhammad KHAN; Afzal SHAH; Zia-Ur REHMAN; Syed Mujtaba SHAH; Athar Y. KHAN; Syed Sakhawat SHAH

Authors

Hafiza S. SHABBEER A-147, Armacost Building Forman Christian College (A Chartered University) Ferozepur Road 54600
Asad Muhammad KHAN A-147, Armacost Building Forman Christian College (A Chartered University) Ferozepur Road 54600
Afzal SHAH Department of Chemistry, Quaid-i-Azam University, Islamabad 45320
Zia-Ur REHMAN Department of Chemistry, Quaid-i-Azam University, Islamabad 45320
Syed Mujtaba SHAH Department of Chemistry, Quaid-i-Azam University, Islamabad 45320
Athar Y. KHAN A-147, Armacost Building Forman Christian College (A Chartered University) Ferozepur Road 54600
Syed Sakhawat SHAH Vice Chancellor, Hazara University Mansehra

Keywords:

Colloidal silver, UV-visible spectroscopy, acidic and basic conditions, plasmon band

Abstract

Preparation of colloidal silver nanoparticles has been carried out by salt reduction method and confirmed by the appearance of plasmon band in the visible region. The prepared nanoparticles were subjected to acidic and basic environments. The plasmon band was studied as a function of time under the described conditions and hence used as a stability check of silver nanoparticles in different media. The mechanism of plasmon band disappearance of silver colloids was found to depend strongly on the pH of the medium.

Graphical abstract

Research highlights

► Plasmon band of silver nanoparticles formed by citrate reduction method is strongly affected by the acidic and basic environments demonstrating effect of pH on the structure and stability of citrate caped silver nanoparticles. ► In acidic condition, an accelerated particle growth results only limited by the buffer action of citrate in solution. ► In the case of base Ag⁺ions formation take place which ultimately deposit on the walls of test tube forming a silver mirror.

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Author Biography

Syed Sakhawat SHAH, Vice Chancellor, Hazara University Mansehra

Prof. Dr. Syed Sakhawat Shah, Vice Chancellor Hazara University, Mansehra is an eminent teacher and research scientist with outstanding record of distinguished teaching services at Quaid-i-Azam University, Islamabad in the Department of Chemistry. Dr. Shah had done his PhD from University of Marburg, Germany. He did his post-doctorate from Germany / England. Dr. Shah got his early education from his native village Sikandarpur, district Haripur and later on joined Govt. Postgraduate College, Abbottabad to get his BSc. degree. He passed his MSc.

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