Nonlinear optical properties of colloidal silver nanoparticles produced by laser ablation in liquids

2004 ◽  
Vol 34 (7) ◽  
pp. 644-648 ◽  
Author(s):  
V A Karavanskii ◽  
Aleksandr V Simakin ◽  
V I Krasovskii ◽  
P V Ivanchenko
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Laser Ablation ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Colloidal Silver ◽  
Colloidal Silver Nanoparticles ◽  
Laser Ablation In Liquids

QUENCHING OF SURFACE PLASMON MODES IN COLLOIDAL SILVER NANOPARTICLES ON OZONIZATION

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 229-234
Author(s):  
R. K. RAKSHIT ◽  
SAYANTANI BHATTACHARYA ◽  
R. C. BUDHANI
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Surface Plasmon ◽  
Effective Medium Theory ◽  
Plasmon Mode ◽  
Colloidal Silver ◽  
Medium Theory ◽  
Bright Yellow ◽  
Plasmon Peak ◽  
Colloidal Silver Nanoparticles

Oxidation characteristics of colloidal silver nanoparticles produced by pulsed laser ablation in pure and chemically treated water are studied as a function of the degree of ozonization. The bright yellow colloidal solution of silver characterized by a sharp surface plasmon mode at ~400 nm, becomes colorless in the initial stages of O 3 flow, and then acquires a brown hue with a broad plasmon peak centered at ~440 to ~450 nm on further ozonization. The solution again becomes colorless in a few days once the O 3 flow is stopped. We present a qualitative model for the reaction dynamics and analyze the optical absorption in the framework of an effective medium theory. The aqueous phase laser ablation chemistry described here provides a unique means to produce ionic silver for enhanced antimicrobial effects.

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