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Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy
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10.1063/1.3456372
/content/aip/journal/jcp/133/1/10.1063/1.3456372
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/1/10.1063/1.3456372

Figures

Image of FIG. 1.
FIG. 1.

Characterization of the silver nanoparticles embedded in PVA matrix. (a) Transmission electron microscope image of the nanoparticles and (b) their statistical size distribution. (c) UV-visible absorption spectra of the Ag-PVA and (d) the PVA films.

Image of FIG. 2.
FIG. 2.

(a) Time domain terahertz pulse with and without the Ag-PVA film, (b) , and (c) . Continuous lines in (b) and (c) are the fits using Eq. (3) with fitting parameters given in Table I. The locations of the confined acoustic phonons of silver nanoparticles at 0.6 and 2.12 THz are marked by vertical arrows . The broad peak at 1.11 THz corresponds to the LAM of crystalline lamellae in the PVA film. The insets of (b) for and (c) for show the results for a pristine PVA film (Ref. 27).

Tables

Generic image for table
Table I.

Parameters obtained from fitting Eq. (3) with the experimentally obtained values of dielectric function for the Ag-PVA film of thickness .

Generic image for table
Table II.

Frequencies in terahertz as a function of the mode index, of the IR active spheroidal , and toroidal , and acoustic modes for a silver nanoparticle with diameter 3.7 nm. The calculations are followed from Refs. 24–26.

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/content/aip/journal/jcp/133/1/10.1063/1.3456372
2010-07-02
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/1/10.1063/1.3456372
10.1063/1.3456372
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