P-39 Synthesis of Silver Nanoparticles by Silver Salt Reduction Method
Abstract
Synthesis and characterization of noble metal nanoparticles are of current interest. Silver nanoparticles have novel optical, electrical, and thermal properties, which are different from the properties of the bulk silver. For example, metallic NPs smaller than the wavelength of light emitted on them show strong dipolar excitations of the electrons in the conduction band in the form of localized Plasmon resonances. It causes a certain wavelength of the light to be blocked from propagating. This property of the silver colloids can be changed by controlling the size, shape and medium of the nanoparticles. Hence, our current work focuses on the synthesis of silver NPs that are free or negligibly very small supporting organic molecules. Silver nanoparticles were synthesized by the silver salt (Ag2O) reduction method and compared with well established silver NPs from silver nitrate (AgNO3). In the present work, acetyl acetate (acac) was used as a reductant molecule. The colloids were centrifuged and/or evaporated using rotavapor in order to produce naked silver NPS. The fabricated silver nanoparticles were characterized by UV-Visible spectroscopy to confirm the formation of silver particles and reduction of stabilizers in the colloids. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) and scanning electron microscopy (SEM) were used to analyze particle size, size distribution, and metal-atom concentrations.
Location
Buller Hallway
Start Date
3-7-2014 2:30 PM
End Date
3-7-2014 4:00 PM
P-39 Synthesis of Silver Nanoparticles by Silver Salt Reduction Method
Buller Hallway
Synthesis and characterization of noble metal nanoparticles are of current interest. Silver nanoparticles have novel optical, electrical, and thermal properties, which are different from the properties of the bulk silver. For example, metallic NPs smaller than the wavelength of light emitted on them show strong dipolar excitations of the electrons in the conduction band in the form of localized Plasmon resonances. It causes a certain wavelength of the light to be blocked from propagating. This property of the silver colloids can be changed by controlling the size, shape and medium of the nanoparticles. Hence, our current work focuses on the synthesis of silver NPs that are free or negligibly very small supporting organic molecules. Silver nanoparticles were synthesized by the silver salt (Ag2O) reduction method and compared with well established silver NPs from silver nitrate (AgNO3). In the present work, acetyl acetate (acac) was used as a reductant molecule. The colloids were centrifuged and/or evaporated using rotavapor in order to produce naked silver NPS. The fabricated silver nanoparticles were characterized by UV-Visible spectroscopy to confirm the formation of silver particles and reduction of stabilizers in the colloids. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) and scanning electron microscopy (SEM) were used to analyze particle size, size distribution, and metal-atom concentrations.
Acknowledgments
Advisor: Getahun Merga, Chemistry & Biochemistry