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      Terahertz time-domain study of silver nanoparticles synthesized by laser ablation in organic liquid

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      Author(s)
      Koral, C.
      Ortaç, B.
      Altan, H.
      Date
      2016-07
      Source 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
      Article
      Item Usage Stats
      184
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      452
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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 spectroscopy
      THz 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/11693/36493
      Published Version (Please cite this version)
      https://doi.org/10.1109/TTHZ.2016.2572360
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      • Institute of Materials Science and Nanotechnology (UNAM) 2098
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