Terahertz time-domain study of silver nanoparticles synthesized by laser ablation in organic liquid
Date
2016-07Source Title
IEEE Transactions on Terahertz Science and Technology
Print ISSN
2156-342X
Publisher
IEEE Microwave Theory and Techniques Society
Volume
6
Issue
4
Pages
525 - 531
Language
English
Type
ArticleItem Usage Stats
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Abstract
We report the investigation of laser-synthesized Ag nanoparticles (Ag-NPs) in an organic liquid environment by using terahertz time-domain spectroscopy (THz-TDS) technique. Colloidal Ag-NPs with an average diameter of 10 nm in two-propanol solution through nanosecond pulsed laser ablation were synthesized. THz-TDS measurements were performed on different volumetric concentration of Ag-NPs suspensions placed in 2-mm path length quartz cuvette. Due to the dispersive and highly absorptive nature of the nano liquids, an approach based on extracting the optical properties through the changes in amplitude and phase solely around the main peak of THz waveform is developed. This approach allowed for an accurate estimation of the complex refractive index of the Metallic-NPs suspension for the different prepared volumetric concentrations. In addition, using Maxwell-Garnett theory, the NP concentration is also extracted. This method shows that the time-domain nature of the THz pulse measurement technique is extremely useful in instances where slight variations in highly dispersive samples need to be investigated.
Keywords
THz applications in chemistry and spectroscopyTHz modeling and analysis techniques
Ablation
Dispersion (waves)
Laser ablation
Laser pulses
Liquids
Metal nanoparticles
Nanoparticles
Optical properties
Organic lasers
Pulsed lasers
Refractive index
Silver
Suspensions (fluids)
Synthesis (chemical)
Terahertz spectroscopy
Ultrafast lasers
Accurate estimation
Ag nanoparticle
Average diameter
Complex refractive index
Nanosecond pulsed laser
Silver nanoparticles
Terahertz time domain spectroscopy
Volumetric concentrations
Time domain analysis
Permalink
http://hdl.handle.net/11693/36493Published Version (Please cite this version)
https://doi.org/10.1109/TTHZ.2016.2572360Collections
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